Sandbox Reserved 1165: Difference between revisions

Structurally, the [https://en.wikipedia.org/wiki/N-terminus N-terminal] extracellular domain (ECD) and the 7TM comprise the signature seven helical structure that is involved in [https://en.wikibooks.org/wiki/Principles_of_Biochemistry/Signaling_inside_the_Cell signaling] via [https://en.wikibooks.org/wiki/Structural_Biochemistry/Energy_coupling_in_chemical_reactions coupling] to [https://en.wikipedia.org/wiki/Heterotrimeric_G_protein heterotrimeric G proteins] that activate [https://en.wikipedia.org/wiki/Adenylyl_cyclase adenylate cyclase] to increase the levels of intracellular [https://en.wikipedia.org/wiki/Cyclic_adenosine_monophosphate cyclic AMP], and also heterotrimeric G proteins, which increases [https://en.wikipedia.org/wiki/Inositol_phosphate inositol phosphate] and intracellular [https://en.wikipedia.org/wiki/Calcium calcium] levels  <ref name="Tips">PMID: 23863937</ref>. The wider and deeper ligand-binding pocket of class B GPCRs allows for a vast array of [https://en.wikipedia.org/wiki/Receptor_(biochemistry) receptors] to be bound that allow for numerous functions activated by peptide receptors <ref name="Ligands">PMID: 21542831</ref>. The conformation and orientation of the 7TM and the ECD regions dictate the functionality of the protein.There is an open and closed [https://en.wikipedia.org/wiki/Conformation conformation] of the GCGR. When glucagon binds to GCGR, the open conformation of GCGR is stabilized. There is no clear binding site location of the hormone peptide ligand. They do know the N-terminus of glucagon binds deep into the binding pocket. The [https://en.wikipedia.org/wiki/Amino_acid amino acids] at the N-terminus have the ability to form [https://en.wikipedia.org/wiki/Hydrogen_bond hydrogen bonds] and [https://en.wikipedia.org/wiki/Ionic_bonding ionic interactions]. Here is the [https://en.wikipedia.org/wiki/Peptide_sequence amino acid sequence] of glucagon <ref name="Sequence">PMID: 11946536</ref>.