Adhesion GPCRs are a quirky bunch. They dance between activated and inhibited states like they’re at a disco. It’s all about those G protein signaling levels, fluctuating like a teenager’s mood. Here’s the kicker: they can activate through two main methods—orthosteric and allosteric. But guess what? For orthosteric action, those NTF/CTF fragments have to break up. Talk about complicated relationships!
When the extracellular domain (ECD) decides to take a hike, it reveals a tethered agonist—yes, that stalk that was just hanging out, waiting to make its entrance. It’s like a shy kid at a party finally letting loose. And let’s not forget the GAIN domain, which plays the role of the party planner, ensuring everything runs smoothly. It’s packed tight with β-strands, keeping it all together. If you’re not familiar with self-cleavage, well, buckle up. It’s essential for that agonistic stalk to pop out and start the signaling party.
Now, add a twist: these adhesion GPCRs can even sense mechanical stimuli. They’re like the superheroes of the receptor world, responding to forces in their environment. Need a little boost? Just call in those binding partners at the N-terminus to spice things up. They’re the allosteric modulator friends you didn’t know you needed.
Oh, and let’s talk about structure. These GPCRs come with fancy features, like massive N-termini that bind to all sorts of extracellular proteins. It’s a big social network out there.
And while they’re busy coupling with heterotrimeric G proteins, the signaling pathways are anything but straightforward. Peptides derived from tethered agonist sequences? Yup, they’re the new cool kids on the block, making waves in the signaling world. But don’t get too comfortable; specificity is still under investigation.
The world of adhesion GPCR modulators is a wild ride, and it’s only going to get more interesting. Buckle up!
