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Phosducin is a ubiquitous G-protein regulator

, and . Proc Natl Acad Sci U S A, 93 (19): 10145-50 (September 1996)Danner, S Lohse, M J Research Support, Non-U.S. Gov't United states Proceedings of the National Academy of Sciences of the United States of America Proc Natl Acad Sci U S A. 1996 Sep 17;93(19):10145-50..

Abstract

Phosducin is a 33-kDa cytosolic regulator of G-protein-mediated signaling that has previously been thought to be specific for retina and pineal gland. In this study, we show widespread tissue distribution of phosducin by the amplification of its cDNA and the detection of two different transcripts in Northern analyses in liver, lung, heart, brain, and retina. On the protein level, phosducin could be detected in 12 bovine tissues by immune precipitation and subsequent Western analysis using anti-phosducin antibodies generated in two different species. Masking of phosducin in direct Western blots appears to explain the failure to detect phosducin in earlier studies. The concentration of phosducin in bovine brain was calculated in the range of 10 pmol/mg total cytosolic protein (approximately 1 microM), whereas in the other tissues, it was slightly less. In these concentrations, phosducin inhibited receptor-stimulated adenylyl cyclase activity in cell membranes by about 50%. Taken together, our results indicate that phosducin is a ubiquitous regulator of G-protein function.

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