[syndicated profile] cbc_topnews_feed
Two women's bobsledders push their sled onto the track.

This coming weekend, Canada's bobsleigh team will compete in Altenberg, Germany for its last chance to qualify a sled at the Milano Cortina Olympics beginning Feb. 6. Kelsey Mitchell, an Olympic track cycling champion who made the switch to bobsleigh in recent months, is hoping it will be her ticket to Milano Cortina.

sanguinity: Woodcut of a heron landing (flight of the heron - landing)
[personal profile] sanguinity
Still catching up on things I wrote in 2025, although I believe this is the last of them.

Most people who might care have seen it already, but for the sake of completeness: I wrote a Flight of the Heron story for the "Pomegaverse" square of Keep Fandom Weird Bingo.

What is Pomegaverse? According to Fanlore's page on Pomegaverse:
In these works, a human character experiences so much stress that they transform into a Pomeranian dog. They can only revert back to their human form if the stress is relieved via receiving love and affection from other people.

I haven't made a serious effort at the rest of that bingo card, but as soon as I saw that square, I knew exactly what I wanted to do with it:

Form'd for Idleness and Ease

Keith & Ewen

Pomegaverse, Animal Transformation, Bad Things Always Happen to Keith, Let's Get That Man Some Affection For a Change, Or At Least a Mini-Vacay as a Beloved Lapdog

Captain Keith Windham's terrible, horrible, no good, very bad day just got worse. Ewen, of course, is a perfect gentleman about it all.


Of course, this all demands an answer to the question of how the war proceeds if soldiers keep turning into lapdogs every time they get stressed out. (The Highland Charge continues to be effective -- perhaps even more so! Culloden... either gets that much horrific, or fizzles out for want of soldiers still standing.) I have no immediate plans to actually do this, but I am a little bit tempted to follow this mechanic through all five meetings of the book, just to see what happens.

Link: Kaiser class action lawsuit

Jan. 16th, 2026 11:03 am
sonia: Quilted wall-hanging (Default)
[personal profile] sonia
I received a notice about this and checked it against classaction.org, so I think it's valid.

Visit www.KaiserPrivacySettlement.com to submit a claim.

Their website is god-awful slow to bring up a Next button when you enter your settlement number, to the point where I had tried it in two other browsers and called the phone number (no human available) before I went back and saw it had finally showed up.

The parties in the lawsuit John Doe, et al. v. Kaiser Foundation Health Plan, Inc., et al., Case No. 3:23-cv-02865-EMC (N.D. Cal.) (“Action”) have reached a proposed settlement of claims (“Settlement”) in a pending class action against Kaiser Foundation Health Plan, Inc. (“Defendant”) and certain related entities. If approved, the Settlement will resolve this Action wherein Plaintiffs allege that Defendant’s websites and mobile applications disclosed their confidential personal information due to third-party software code. Plaintiffs allege that this code was embedded across Defendant’s platforms, including the secure patient portal, and transmitted information to third parties when users navigated these platforms. Defendant firmly denies the allegations, denying any liability or wrongdoing, and denies that Plaintiffs are entitled to any relief arising from this Action. Defendant also maintains that Plaintiffs have not suffered any damages arising from this Action.

Birdfeeding

Jan. 16th, 2026 01:06 pm
ysabetwordsmith: Cartoon of me in Wordsmith persona (Default)
[personal profile] ysabetwordsmith posting in [community profile] birdfeeding
Today is cloudy and chilly.  It snowed last night, just enough to leave a blanket of white over everything.  Most of it has already melted away.

I fed the birds.  I've seen a few sparrows.

I put out water for the birds.

EDIT 1/16/26 -- I saw a mourning dove.

EDIT 1/16/26 -- I did a bit of work around the patio.

As it is getting dark, I am done for the night.
  
[syndicated profile] snopes_feed

Posted by Jack Izzo

Snopes linked the domain to an email address owned by Mark Davis, a candidate for Congress in Florida's 16th District.

New Year, New Dentist

Jan. 16th, 2026 10:18 am
xinas_island: Me as a Pink Haired Avatar (Default)
[personal profile] xinas_island
First ever visit to our new Dentist (that is actually IN Sooke, No more treks to Colwood for appointments *yay*). 💕

Don't get me wrong. There was nothing wrong with our old Dentist. We actually quite like him. But the travel time and trying to schedule around Aaron's work was getting harder and harder, so it was just time to switch.  And since Aaron had already been to the Dentist in Sooke for an emergency recently (our Dentist was not available), he already knew he liked the work they do so far and the way their office is.

Plus they are open Monday thru Saturday! Amazing!😍

Anywho, We had our initial admitting appointment yesterday afternoon. Paperwork, X-rays, and an initial assessment of the teeth.💕

All looks great still for me. *phew* I do have a couple old white fillings on the right side (upper and lower) that will get replaced in Feb., as they've shrunk quite a bit. I could have deferred till next year, but figured our insurance just rolled over, and so doing it now was better. 😄 

So, I'm getting a cleaning on the 24th (A Saturday! Holy crap, we have a Dentist that's open on a Saturday now!).  And then, the first week in February, my fillings will get dealt with *hooray!*. I'll need to remember to take Advil before hand.

Aaron's got British teeth, ie: They tend to crack and break down more easily. And so he'll have to have a lot more checked on as time goes on.
So he'll possibly more visits than me going forward. They really want him to consider implants, but he's pretty nervous about that option (I don't blame him).
And I guess the cost they mentioned is approx $3K per tooth (Includes the surgically installed post, and 
custom-made crown installed). The numbers freaked him out a bit (as well as the idea of posts being installed in his jawbone), so he's at the 'thinking' stage for the near future.

But being closer to the Dentists office will make things a lot easier all around, regardless of what he decides.

We were still in the old mind set when booking things, so my appointments are a bit wonky on the time and days (Still scheduled my things around A's work... but the place is walking distance, so that was silly of me. Leaving them as they are, but any future appointments for myself I'll just set for when ever I want them. (I prefer early, and on a weekday)😄
 
Note to self :
It's now easily walking distance to get there, so you Don't have to book around travel time/A's work schedule any more. 😄
Remember that the next time you have to book.💕


celebrity20in20 Round 19

Jan. 16th, 2026 01:37 pm
reeby10: Zachary Quinto and Christ Pine standing next to each other with "xoxox" at the bottom (pinto)
[personal profile] reeby10 posting in [site community profile] dw_community_promo


Link: Round 19 Sign Ups | Round 19 Themes

Description: [community profile] celebrity20in20 is a 20in20 community dedicated to making icons of actors and actresses. You have 20 days to make 20 icons about a celebrity of your choice, based on a set of themes for the round.

Schedule: Round 19 sign ups are open NOW. Icons are due February 5, 2026.

concert revew: San Francisco Symphony

Jan. 16th, 2026 10:27 am
calimac: (Haydn)
[personal profile] calimac
My first concert of the calendar year, and almost a month since the last one.

The first time I heard Edward Gardner guest conduct SFS, I thought he led hot and sizzling performances. Half of that Edward Gardner showed up this time.

The half that didn't led the Bruch G-minor Violin Concerto. Soloist Randall Goosby had a remarkably light and smooth tone, and drove his part forward pretty well, but as an orchestral piece this was bland and dull. I wasn't too excited by the rendition of Vaughan Williams's Overture to The Wasps either, though the sound of the orchestra was unusually broad and shiny, especially in the winds.

This sound quality reappeared in places like the flute choir passages of Holst's "Saturn," and yes, The Planets was the good half of the concert. Hot and sizzling it was when the score called for it, but the most remarkable movement was the quietest, "Neptune," a most crisp and clear but delicate performance of an often-fuzzy piece. I left stripped of the forebodings I'd felt during intermission.
[syndicated profile] reactor_feed

Posted by Molly Templeton

News What to Watch

What to Watch and Read This Weekend: Lord of the Rings Returns to Theaters Because It Is… 25 Years Old?!

By

Published on January 16, 2026

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<p class="syndicationauthor">Posted by Molly Templeton</p><p class="ljsyndicationlink"><a href="https://reactormag.com/what-to-watch-read-this-weekend-january-16-2026/">https://reactormag.com/what-to-watch-read-this-weekend-january-16-2026/</a></p><p class="ljsyndicationlink"><a href="https://reactormag.com/?p=837021">https://reactormag.com/?p=837021</a></p><post-hero class="wp-block-post-hero js-post-hero post-hero post-hero-horizontal"> <div class="container container-desktop"> <div class="flex flex-col mx-auto post-hero-container"> <div class="post-hero-content"> <div class="post-hero-tags font-aktiv text-xs tracking-[0.5px] font-medium uppercase"> <span class="mr-3"> <i class="inline-block w-2 h-2 rounded-full mr-[5px] bg-blue"></i> <a href="https://reactormag.com/articles/news/" class="inline-block link-no-animation" aria-label="Link to term or tag News 0"> News </a> </span> <span class="mr-3"> <i class="inline-block w-2 h-2 rounded-full mr-[5px] bg-blue"></i> <a href="https://reactormag.com/tag/what-to-watch/" class="inline-block link-no-animation" aria-label="Link to term or tag What to Watch 1"> What to Watch </a> </span> </div> <h2 class="post-hero-title text-h1">What to Watch and Read This Weekend: <i>Lord of the Rings</i> Returns to Theaters Because It Is… 25 Years Old?!</h2> <div class="post-hero-wrapper"> <div class="post-hero-inner"> <p class="post-hero-author text-xs font-aktiv uppercase font-medium [&amp;_a]:link-hover">By <a href="https://reactormag.com/author/molly-templeton/" title="Posts by Molly Templeton" class="author url fn" rel="author">Molly Templeton</a></p> <span class="post-hero-symbol relative top-[-2px] hidden tablet:block">|</span> <p class="text-xs uppercase post-hero-publish font-aktiv"> Published on January 16, 2026 </p> </div> </div> <div class="quick-access post-hero-quick-access mt-[17px] tablet:hidden"> <div class="flex gap-[30px] tablet:gap-6"> <a 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11.7513C4.78371 10.1926 2.89605 9.41364 0.678713 9.41431V6.41431C2.21205 6.41431 3.64538 6.70197 4.97871 7.27731C6.31205 7.85264 7.47471 8.63597 8.46671 9.62731C9.45805 10.6186 10.2414 11.781 10.8167 13.1143C11.392 14.4476 11.6794 15.881 11.6787 17.4143H8.67871Z" fill="currentColor" fill-opacity="0.2" /> </g> <defs> <clippath id="clip0_1051_121783"> <rect width="17" height="17" fill="white" transform="translate(0.678711 0.414307)" /> </clippath> </defs> </svg> </a> </li> </ul> </div> </details> </div> </div> </div> <div class="post-hero-media "> <figure class="w-full h-auto post-hero-image"> <img loading="lazy" decoding="async" width="740" height="467" src="https://reactormag.com/wp-content/uploads/2021/05/LOTR-Fellowship-Elijah-Wood-740x467.png" class="w-full object-cover" alt="Frodo (Elijah Wood) in Peter Jackson&#39;s The Lord of the Rings: The Fellowship of the Ring" srcset="https://reactormag.com/wp-content/uploads/2021/05/LOTR-Fellowship-Elijah-Wood-740x467.png 740w, https://reactormag.com/wp-content/uploads/2021/05/LOTR-Fellowship-Elijah-Wood-1100x694.png 1100w, https://reactormag.com/wp-content/uploads/2021/05/LOTR-Fellowship-Elijah-Wood-768x484.png 768w, https://reactormag.com/wp-content/uploads/2021/05/LOTR-Fellowship-Elijah-Wood.png 1500w" sizes="auto, (max-width: 740px) 100vw, 740px" /> </figure> </div> </div> </div> </post-hero> <div class="wp-block-more-from-category"> <div> </div> </div> <p>To put it mildly—absurdly mildly, really—this year is off to a rough start. If you want to spend your weekend lying around in soft pants and rewatching old favorites, I understand completely. But if you want to leave the house, or try something new, there are options! There are also a million options if you want to do something to help those who are suffering in this cold, icy winter. Stock up a little free pantry near your house, if there is one. Send some money to one of the <a href="https://bsky.app/profile/annehelen.bsky.social/post/3mce57bszp22e" target="_blank" rel="noreferrer noopener">many</a> <a href="https://bsky.app/profile/supplydepotmpls.bsky.social/post/3ma7vc3exbs2g" target="_blank" rel="noreferrer noopener">groups</a> in Minneapolis who are working to support their neighbors—or find similar groups in your own area. It is hard to watch what’s happening in this country right now. It feels better to help, if and where you can. And, as ever, don’t forget to <a href="https://5calls.org/" target="_blank" rel="noreferrer noopener">call your reps</a>.&nbsp;</p> <div style="height:10px" aria-hidden="true" class="wp-block-spacer"></div> <h3 class="wp-block-heading"><strong>They’re Taking the Hobbits to Isengard: The Lord of the Rings is back in Theaters</strong></h3> <p>Do I have the extended editions of the <em>Lord of the Rings</em> films at home on DVD? Yes. Do I still have a great desire to go see them in theaters while they’re back this week? <em>Yes</em>. Yes, friends, the latest return-to-cinemas release is the entire <a href="https://www.fathomentertainment.com/series/the-lord-of-the-rings-trilogy/" target="_blank" rel="noreferrer noopener"><em>Lord of the Rings</em> trilogy</a>. <em>The Fellowship of the Ring</em> turns 25 this year—in December, mind you—which means, I expect, that there will be a whole host of re-releases and <a href="https://www.barnesandnoble.com/w/the-fellowship-of-the-ring-25th-anniversary-movie-tie-in-j-r-r-tolkien/1149160435" target="_blank" rel="noreferrer noopener">new book editions</a> and who knows what else. Not that I’m complaining.  <em>The Two Towers</em> might be my favorite of the movies—Helm’s Deep!—but I&#8217;m thinking about going to <em>Fellowship</em> just so I can get extremely weepy when Gandalf says the line. You know the one. The one that feels extra relevant right now? “All we have to decide is what to do with the time that is given us.”</p> <p>Sorry. Something in my eye. Perhaps a <a href="https://www.youtube.com/watch?v=uE-1RPDqJAY" target="_blank" rel="noreferrer noopener">slight change in tone</a> will alleviate the feelings I’m now having.</p> <div style="height:10px" aria-hidden="true" class="wp-block-spacer"></div> <h3 class="wp-block-heading"><strong>An Anthology of Hope and Stories: </strong><strong><em>We Will Rise Again</em></strong></h3> <p>Books published in December historically have it pretty rough. The year’s best-of lists have largely already happened; people are distracted by the holidays; people are distracted, period, in this particular day and age. This past December, a lot of air was taken up by a memoir—by all accounts <a href="https://bookmarks.reviews/reviews/american-canto/" target="_blank" rel="noreferrer noopener">truly terrible</a>—that no one needs to read. So it’s entirely possible to have missed some of the month’s more interesting releases, including the all-star anthology <em>We Will Rise Again: Speculative Stories and Essays on Protest, Resistance, and Hope</em>, edited by Malka Older, Annalee Newitz, and Karen Lord.</p> <p>This book couldn’t really be more timely. I keep thinking about the writer Karen Russell saying in essence, that at this point, everyone she knows can lie awake at 4 am and create a dystopia. It’s not hard to imagine. (I’m paraphrasing, but if you want to hear her and her fellow genius Omar El Akkad in conversation, you can listen <a href="https://literary-arts.org/archive/omar-el-akkad-and-karen-russell-in-conversation/" target="_blank" rel="noreferrer noopener">here</a>.) Hope is a little harder these days. </p> <p><em>We Will Rise Again</em> includes stories by R.B. Lemberg, Nicola Griffith, Samit Basu, N.K. Jemisin,  Izzy Wasserstein, and many more. Reactor’s Christina Orlando <a href="https://reactormag.com/30-more-sff-titles-to-look-forward-to-in-2025/" target="_blank" rel="noreferrer noopener">called it</a> a book that “should be read by anyone who cares about the world around them and believes that sci-fi and fantasy can help us imagine real possibilities.” </p> <div style="height:10px" aria-hidden="true" class="wp-block-spacer"></div> <h3 class="wp-block-heading"><strong>There’s Coffee in that Nebula: Happy Anniversary, <em>Star Trek: Voyager</em></strong></h3> <p>If multiple sources are to be believed, today, January 16th, is the anniversary of the first episode of <em>Star Trek: Voyager</em>. I love this little fact, because <em>Voyager</em> was the first show I remember wanting to see at its premiere: A lady captain? In space? I was <em>so</em> excited. It’s funny to look back now and think about how young Janeway looks, even though they put Kate Mulgrew in that stodgy hairstyle to make her seem older. (Now there was a captain who <a href="https://www.youtube.com/watch?v=NY_UHm8rvmY" target="_blank" rel="noreferrer noopener">had her priorities straight</a>.) At any rate, <em>Voyager</em> still has its charms, and is especially relevant given that the ship’s Doctor (Robert Picardo) is now on the just-premiered <em>Star Trek: Starfleet Academy</em>. What’s old is new again, what goes around comes around, and if Stars both Trek and Wars are struggling in the cinematic arena, at least the shows keep coming. You can get all your Trek fixes on Paramount Plus; <em>Voyager</em> is also on Pluto TV.</p> <div style="height:10px" aria-hidden="true" class="wp-block-spacer"></div> <h3 class="wp-block-heading"><strong>A Daily Reading Habit</strong></h3> <p>I did not in fact succeed at any of the <a href="https://reactormag.com/what-to-watch-read-this-weekend-december-19-2025/" target="_blank" rel="noreferrer noopener">reading and watching plans I had for the holidays</a>. I didn’t go to a single movie. I am an abject failure at movies. I read entirely different books than the ones I was supposed to read, but at least one of those was fully justified: I’d gone all of 2025 without reading any poetry, somehow? So I read Morgan Parker’s <em>There Are More Beautiful Things Than Beyoncé</em> on New Year’s Eve, and started all three of the translations of the <em>Tao Te Ching</em> that I somehow have in my house. (They’re by Stephen Mitchell, Ursula K. Le Guin, and Ken Liu.) I’m reading one page per day, in all three versions. I’m reading these pages alongside the daily selection from John Darnielle’s <em>This Year: 365 Songs Annotated</em>; these things make total sense in my brain, if perhaps not everyone else’s.</p> <p>My point here, though, is that having a small thing that I read every day is just really, really nice. I do a lot of other reading! But these brief selections break up the day, and help cement a habit, and also the specific things I’m reading just feel good as a break from all the fiction and, let’s be honest, crap on the internet. Once I’m through the <em>Tao Te Ching</em>s, I’ll go back to Mason Currey’s two <em>Daily Rituals</em> books and read an entry in each of those each day. The Darnielle will keep me company all year. Maybe there’s something you can find that’s like that. It’s fun! I promise![end-mark]</p> <figure class="wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio"><div class="wp-block-embed__wrapper"> <site-embed id="10674"/> </div></figure> <p>The post <a href="https://reactormag.com/what-to-watch-read-this-weekend-january-16-2026/">What to Watch and Read This Weekend: &lt;i&gt;Lord of the Rings&lt;/i&gt; Returns to Theaters Because It Is… 25 Years Old?!</a> appeared first on <a href="https://reactormag.com">Reactor</a>.</p><p class="ljsyndicationlink"><a href="https://reactormag.com/what-to-watch-read-this-weekend-january-16-2026/">https://reactormag.com/what-to-watch-read-this-weekend-january-16-2026/</a></p><p class="ljsyndicationlink"><a href="https://reactormag.com/?p=837021">https://reactormag.com/?p=837021</a></p>
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Posted by Molly Templeton

News Tesseract

Sam Esmail’s Next Sci-Fi Movie Will Star Glen Powell

And that’s about all there is to know about Tesseract—so far

By

Published on January 16, 2026

Screenshot: Universal Pictures

Glen Powell in Twisters

Screenshot: Universal Pictures

If you, like me, are a lightly obsessive fan of Sam Esmail’s series Mr. Robot, you are probably always curious about what the man is going to do next. He didn’t get far with his Battlestar Galactica reboot (which I very much wanted to see). His take on Metropolis got scrapped during the 2023 writers’ strike. He did manage to make an eerie adaptation of Rumaan Alam’s novel Leave the World Behind—a movie which crops up in my mind every time I see too many Teslas on one block.

But that was in 2023. I have been waiting for a new Esmail project ever since. And now that, if slightly vague, news has come. The Hollywood Reporter says that Esmail has a new sci-fi project in the works called Tesseract, and it’s set to star the now-ubiquitous Glen Powell (Twisters, pictured above). Esmail will write and direct, and the film “has landed at Amazon MGM and United Artists” (producer Scott Stuber recently signed a deal with Amazon MGM).

THR offers only one other detail: “The project does call for two other lead roles, both females, according to sources.” The movie is not greenlit, but may shoot over the summer in Europe.

It’s not a lot to go on, but that title is intriguing, at least to Marvel fans and Madeleine L’Engle readers (and, I guess, geometry fans?). This is simply Tesseract, not The Tesseract; that title belongs to an existing film based on an Alex Garland novel.

Esmail has one project to finish before Tesseract gets going: the thriller Panic Carefully, which he also wrote and directed. It stars Julia Roberts, Eddie Redmayne, Elizabeth Olsen, Joe Alwyn, Aidan Gillen, Brian Tyree Henry, and Ben Chaplin, and reportedly involves the hunt for a cyber-terrorist. No release dates have been announced for any upcoming Esmail projects. Yet.[end-mark]

The post Sam Esmail’s Next Sci-Fi Movie Will Star Glen Powell appeared first on Reactor.

[syndicated profile] snopes_feed

Posted by Jordan Liles

A heartwarming story alleged the Oscar-winning actor helped a man who had years earlier aided her when she was living out of her car.
[syndicated profile] snopes_feed

Posted by Nur Ibrahim

A video depicting a federal agent running toward protesters and falling on ice in Minneapolis is authentic. But some posts miss a detail.
[syndicated profile] cbc_topnews_feed
American male base baseball player

Blue Jays homegrown star Bo Bichette is leaving Toronto for the New York Mets, according to media reports. The Associated Press and ESPN report the deal is for $126 million US over three years.

Six stories for six fandoms

Jan. 16th, 2026 05:50 pm
fabiadrake: (Default)
[personal profile] fabiadrake posting in [community profile] historium
Hello, this is a little mass-post of some historical(-adjacent) fics I’ve written previously (barring Band of Brothers, which for some reason has caused me to write more stories than I usually would per fandom and so would make this post too long). At present I’ve restricted access on AO3 but not DW; either of those could change.

I am too lazy to cross-post these to any fandom-specific comms today, so advance apologies if I eventually muster the stamina to do so and you see them again sometime.

Creator: bluewoodensea
Title: The Autumn Leaves
Fandom: Hornblower
Rating: T
Word count: 2k
Pairings: Horatio/Clayton
Notes/Warnings: Angst, grief, death; contains spoilers
Link: AO3 / DW

Creator: bluewoodensea
Title: Meerüberrauscht
Fandom: 1899
Rating: M
Word count: 6k
Pairings: Eyk/Sebastian
Notes/Warnings: Alcoholism, bereavement; contains spoilers
Summary: Non-linear relationship study, partially real memories (unshared) and partially false memories (shared)
Link: AO3 / DW

Creator: bluewoodensea
Title: The Book; His Reader
Fandom: Jonathan Strange & Mr Norrell
Rating: M
Word count: 4k
Pairings: Childermass/Vinculus
Notes/Warnings: Spoilers
Summary: Post-novel; Childermass and Vinculus leave York
Link: AO3 / DW

Creator: bluewoodensea
Title: All the World
Fandom: The Forsyte Saga
Rating: G
Word count: 200
Characters: June Forsyte
Notes/Warnings: Mild spoilers
Summary: Just a short character study (in defence of June Forsyte’s happiness)
Link: AO3 / DW

Creator: bluewoodensea
Title: The Ways of Silence
Fandom: The Borgias
Rating: T
Word count: 600
Characters: Micheletto & the taxidermist
Notes/Warnings: (eg. spoilers, triggers; choose not to warn)
Summary: Why Micheletto Corella didn’t murder anyone this time
Link: AO3 / DW

Creator: bluewoodensea
Title: Poor Monster
Fandom: Twelfth Night
Rating: G
Word count: 400
Pairings: Viola/Olivia
Summary: I’ll be honest, it’s a post-canon fix-it
Link: AO3 / DW

Good Old Bewildering GPCRs

Jan. 16th, 2026 11:52 am
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Ah, G-protein coupled receptors. They’re an absolute mainstay of drug discovery and have been for many decades, and one of the first projects I worked in when I joined the industry was an effort to produce selective muscarinic M2 antagonists. A few years back I had the chance to meet Bob Lefkowitz (Nobel for GPCRs, along with Brian Kobilka), and I mentioned to him that back in the early 1990s when I was working on them I thought I understood them reasonably well. He grinned when I told him that as time went on I decided that I actually didn’t know jack #$! about them, and that this became more apparent every passing year. This new paper emphasizes that situation!

To recap for folks who don’t do this for a living, GPCRs are ubiquitous proteins found on the cell surface, which extend all the way to the inside cytoplasm. There are whole families of these things (with the classic opioid, dopamine, and serotonin ones being famous examples), and they are a way for cells to receive chemical signals from outside that get turned into intracellular changes as these receptors get activated or inactivated.

Those “G proteins” in the name are associated with the inner poking-into-the-cell region of the GPCR. The receptor itself changes shape as small molecule ligands (like dopamine!) bind to it or leave on the outside surface, and the activities of the G proteins on the inside change in response to those movements in turn. And those activities include formation or cleavage of a number of prominent “second messenger” molecules like cyclic AMP and others, which set off all kinds of activity as their concentrations move up and down. It’s really a sort of physical toggle switch to get signals through the cell membrane, and on close inspection they truly resemble an old Rube Goldberg machine where the cat jumps for the toy mouse, moving a lever that makes the ball go down and hit the bell that wakes up the bird, which flies over to the. . .

Complications ensue. As mentioned, there are often a whole list of GPCRs that respond to the same ligand but are hooked up to different second messengers and are found on different types of cells. That’s one level. Another is that the ligands that activate these receptors (“agonists” in the nomenclature) don’t always activate them to the same degree - there are “partial agonists” that can have different effects than the “full agonists”. Then you have molecules that bind to the receptor but don’t activate it (and in fact can keep agonists from binding while they’re around) - those are “antagonists”, and there are several ways that they can bind to make this happen. Yet another variation is the way that some receptors are set in the “always on” position, activating their second messenger proteins all the time, until a ligand comes along and binds to them to change their shape that then actually shuts them off instead. These are “inverse agonists”. Then you have the way that some particular GPCR subtypes seem to cluster together in defined groups on the cell surface and affect each other’s signaling and behavior as opposed to how they act when they’re studied in isolation. I’m not even going to start on the subtleties on the inner loops of these proteins; suffice it to say that there are whole other signaling families that can also bind down there in addition to the various G-proteins. Oh, it’s a mess.

This latest paper is actually trying to bring some of that mess into better focus, and they’re using my old friend and sparring partner the M2 muscarinic receptor as an example. It’s a good choice because it’s been shown to have some large structural changes on ligand binding. Through genetic manipulation and fluorescence microscopy, they’re able to set up a number of structural reporters for the physical state of the receptor protein (the fluorescent groups respond to changes in their environment, such as being shifted into a more or less polar region). And what they find is that this garden-variety GPCR has a whole range of behaviors when exposed to various agonist molecules, shifting around on millisecond time scales between several conformational states with equilibrium constants between each of them. Different agonist molecules hit in different ways when examined at this level of resolution - there are several distinct active states for this GPCR and they interact with the G-proteins in different ways.

The authors dryly note that “Overall, our study reveals that the activation of a GPCR in intact cells may be far more complex than previous biophysical studies with isolated receptors have suggested”. And as I mentioned above, it’s not like the previous studies have all led to a simple or orderly model themselves! But this is probably a first look at what’s really happening with these receptors, and we’re going to have to get more details as we try to figure out whether we can use this knowledge to our advantage with new ligands. One way or another, we all now officially know more about GPCRs than we did, and we all now officially understand them less. Welcome to the club!

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"Jazz Fish, a saxophone playing wanderer, finds himself in Mamboland at a critical phase in his life." --Howie Green, on his book Jazz Fish Zen

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