D
IPR016137

RGS domain

InterPro entry
Short nameRGS
Overlapping
homologous
superfamilies
 
RGS, subdomain 1/3 (IPR024066)
RGS, subdomain 2 (IPR044926)
domain relationships

Description

This entry represents a structural domain with a multi-helical fold consisting of a 4-helical bundle with a left-handed twist and an up-and-down topology. This domain can be divided into two all-α subdomains. This domain is found in regulation of G-protein signalling (RGS) proteins, as well as other related proteins, including:


 * RGS4
[1]
.
 * RGS9
[2]
.
 * G-alpha interacting protein GaIP
[3]
.
 * Axin
[4]
.
 * p115RhoGEF
[5]
.
 * Pdz-RhoGEF
[6]
.
 * G-protein coupled receptor kinase 2 N-terminal domain
[7]
.


RGS (Regulator of G Protein Signalling) proteins are multi-functional, GTPase-accelerating proteins that promote GTP hydrolysis by the alpha subunit of heterotrimeric G proteins, thereby inactivating the G protein and rapidly switching off G protein-coupled receptor signalling pathways. Upon activation by GPCRs, heterotrimeric G proteins exchange GDP for GTP, are released from the receptor, and dissociate into free, active GTP-bound alpha subunit and beta-gamma dimer, both of which activate downstream effectors. The response is terminated upon GTP hydrolysis by the alpha subunit (
IPR001019
), which can then bind the beta-gamma dimer (
IPR001632
,
IPR001770
) and the receptor. RGS proteins markedly reduce the lifespan of GTP-bound alpha subunits by stabilising the G protein transition state.

All RGS proteins contain an 'RGS-box' (or RGS domain), which is required for activity. Some small RGS proteins such as RGS1 and RGS4 are comprised of little more than an RGS domain, while others also contain additional domains that confer further functionality. RGS domains can be found in conjunction with a variety of domains, including: DEP for membrane targeting (
IPR000591
), PDZ for binding to GPCRs (
IPR001478
), PTB for phosphotyrosine-binding (
IPR006020
), RBD for Ras-binding (
IPR003116
), GoLoco for guanine nucleotide inhibitor activity (
IPR003109
), PX for phosphatidylinositol-binding (
IPR001683
), PXA that is associated with PX (
IPR003114
), PH for stimulating guanine nucleotide exchange (
IPR001849
), and GGL (G protein gamma subunit-like) for binding G protein beta subunits (
IPR001770
). Those RGS proteins that contain GGL domains can interact with G protein beta subunits to form novel dimers that prevent G protein gamma subunit binding and G protein alpha subunit association, thereby preventing heterotrimer formation.

References

1.Structure of RGS4 bound to AlF4--activated G(i alpha1): stabilization of the transition state for GTP hydrolysis. Tesmer JJ, Berman DM, Gilman AG, Sprang SR. Cell 89, 251-61, (1997). View articlePMID: 9108480

2.Structural determinants for regulation of phosphodiesterase by a G protein at 2.0 A. Slep KC, Kercher MA, He W, Cowan CW, Wensel TG, Sigler PB. Nature 409, 1071-7, (2001). View articlePMID: 11234020

3.Solution structure of human GAIP (Galpha interacting protein): a regulator of G protein signaling. de Alba E, De Vries L, Farquhar MG, Tjandra N. J. Mol. Biol. 291, 927-39, (1999). View articlePMID: 10452897

4.Structural basis of the Axin-adenomatous polyposis coli interaction. Spink KE, Polakis P, Weis WI. EMBO J. 19, 2270-9, (2000). View articlePMID: 10811618

5.Structure of the rgRGS domain of p115RhoGEF. Chen Z, Wells CD, Sternweis PC, Sprang SR. Nat. Struct. Biol. 8, 805-9, (2001). View articlePMID: 11524686

6.Structure of the RGS-like domain from PDZ-RhoGEF: linking heterotrimeric g protein-coupled signaling to Rho GTPases. Longenecker KL, Lewis ME, Chikumi H, Gutkind JS, Derewenda ZS. Structure 9, 559-69, (2001). View articlePMID: 11470431

7.Keeping G proteins at bay: a complex between G protein-coupled receptor kinase 2 and Gbetagamma. Lodowski DT, Pitcher JA, Capel WD, Lefkowitz RJ, Tesmer JJ. Science 300, 1256-62, (2003). View articlePMID: 12764189

Cross References

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