期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 105, 期 52, 页码 20988-20993出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0808941106
关键词
G proteins; phototransduction; RGS proteins
资金
- National Eye Institute [EY018139, EY14047, EY012859, EY012576, EY5722]
- Research to Prevent Blindness
Two isoforms of the GTPase-activating protein, regulator of G protein signaling 9 (RGS9), control such fundamental functions as vision and behavior. RGS9-1 regulates phototransduction in rods and cones, and RGS9-2 regulates dopamine and opioid signaling in the basal ganglia. To determine their functional differences in the same intact cell, we replaced RGS9-1 with RGS9-2 in mouse rods. Surprisingly, RGS9-2 not only supported normal photoresponse recovery under moderate light conditions but also outperformed RGS9-1 in bright light. This versatility of RGS9-2 results from its ability to inactivate the G protein, transducin, regardless of its effector interactions, whereas RGS9-1 prefers the G protein-effector complex. Such versatility makes RGS9-2 an isoform advantageous for timely signal inactivation across a wide range of stimulus strengths and may explain its predominant representation throughout the nervous system.
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