New dimensions in G protein signalling: G beta 5 and the RGS proteins.
Pharm Acta Helv
; 74(2-3): 333-6, 2000 Mar.
Article
em En
| MEDLINE
| ID: mdl-10812978
ABSTRACT
The beta gamma complex of G-proteins regulates effectors independently of the G alpha subunits, such that upon activation G proteins give may signal downstream along one or both pathways. The G beta 5 isoform exhibits much less homology with other G beta isoforms (approximately 50%) and is preferentially expressed in brain. The G beta 5 isoform exhibits novel properties in its activation of effector pathways such as MAPK, phospholipase C-beta, and adenylyl cyclase type II when compared to G beta 1. Recently specific native complexes between G beta 5 and the regulator of G protein signaling (RGS) protein-7 (RGS7) and between G beta 5L (a splice variant with a 42 amino acid N-terminal extension) and RGS9 have been isolated from different retinal fractions. Such findings are not accounted for by current models as only the G alpha subunits and not G beta had been previously implicated in RGS protein function. These recent novel observations further reinforce the view of G beta 5 as a unique and highly specialized G protein subunit.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Transdução de Sinais
/
Proteínas de Ligação ao GTP
/
Proteínas RGS
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Pharm Acta Helv
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Estados Unidos