Expression levels of RGS7 and RGS4 proteins determine the mode of regulation of the G protein-activated K(+) channel and control regulation of RGS7 by G beta 5.

Abstract:

:Regulators of G protein signaling RGS4 and RGS7 accelerate the kinetics of K(+) channels (GIRKs) in the Xenopus oocyte system. Here, via quantitative analysis of RGS expression, we reveal biphasic effects of RGSs on GIRK regulation. At low concentrations, RGS4 inhibited basal GIRK activity, but stimulated it at high concentrations. RGS7, which is associated with the G protein subunit G beta 5, is regulated by G beta 5 by two distinct mechanisms. First, G beta 5 augments RGS7 activity, and second, it increases its expression. These dual effects resolve previous controversies regarding RGS4 and RGS7 function and indicate that they modulate signaling by mechanisms supplementary to their GTPase-activating protein activity.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Keren-Raifman T,Bera AK,Zveig D,Peleg S,Witherow DS,Slepak VZ,Dascal N

doi

10.1016/s0014-5793(01)02220-7

keywords:

subject

Has Abstract

pub_date

2001-03-09 00:00:00

pages

20-8

issue

1-2

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(01)02220-7

journal_volume

492

pub_type

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