Mutant G protein subunit activated by G : A model for receptor activation?
نویسندگان
چکیده
منابع مشابه
G-protein Coupled Receptor Dimerization
A growing body of evidence suggests that GPCRs exist and function as dimers or higher oligomers. The evidence for GPCR dimerization comes from biochemical, biophysical and functional studies. In addition, researchers have shown the occurrence of heterodimerization between different members of the GPCR family. Two receptors can interact with each other to make a dimer through their extracellular...
متن کاملA single subunit (GB2) is required for G-protein activation by the heterodimeric GABA(B) receptor.
Although G-protein-coupled receptors (GPCRs) have been shown to assemble into functional homo or heteromers, the role of each protomer in G-protein activation is not known. Among the GPCRs, the gamma-aminobutyric acid (GABA) type B receptor (GABA(B)R) is the only one known so far that needs two subunits, GB1 and GB2, to function. The GB1 subunit contains the GABA binding site but is unable to a...
متن کاملA concept for G protein activation by G protein-coupled receptor dimers: the transducin/rhodopsin interface.
G protein-coupled receptors (GPCRs) are ubiquitous and essential in modulating virtually all physiological processes. These receptors share a similar structural design consisting of the seven-transmembrane alpha-helical segments. The active conformations of the receptors are stabilized by an agonist and couple to structurally highly conserved heterotrimeric G proteins. One of the most important...
متن کاملStructural prerequisites for G-protein activation by the neurotensin receptor
We previously determined the structure of neurotensin receptor NTSR1 in an active-like conformation with six thermostabilizing mutations bound to the peptide agonist neurotensin. This receptor was unable to activate G proteins, indicating that the mutations restricted NTSR1 to relate agonist binding to G-protein activation. Here we analyse the effect of three of those mutations (E166A(3.49), L3...
متن کاملFidelity of G protein b-subunit association by the G protein g-subunit-like domains of RGS6, RGS7, and RGS11
Several regulators of G protein signaling (RGS) proteins contain a G protein g-subunit-like (GGL) domain, which, as we have shown, binds to Gb5 subunits. Here, we extend our original findings by describing another GGLdomain-containing RGS, human RGS6. When RGS6 is coexpressed with different Gb subunits, only RGS6 and Gb5 interact. The expression of mRNA for RGS6 and Gb5 in human tissues overlap...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 2001
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.101136198