%0 Journal Article %1 Muller1996 %A Muller, S. %A Straub, A. %A Schroder, S. %A Bauer, P. H. %A Lohse, M. J. %D 1996 %J J Biol Chem %K Adenosine Animals Binding Diphosphate Eye GTP GTP-Binding Phosphohydrolases/metabolism Phosphoproteins/*metabolism Phosphorylation Protein Regulators Ribose/metabolism Sites Spodoptera Proteins/metabolism %N 20 %P 11781-6 %T Interactions of phosducin with defined G protein beta gamma-subunits %U http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=8662655 %V 271 %X Phosducin has recently been identified as a cytosolic protein that interacts with the beta gamma-subunits of G proteins and thereby may regulate transmembrane signaling. It is expressed predominantly in the retina but also in many other tissues, which raises the question of its potential specificity for retinal versus nonretinal beta gamma-subunits. We have therefore expressed and purified different combinations of beta- and gamma-subunits from Sf9 cells and have also purified transducin-beta gamma from bovine retina and a mixture of beta gamma complexes from bovine brain. Their interactions with phosducin were determined in a variety of assays for beta gamma function: support of ADP-ribosylation of alpha 0 by pertussis toxin, enhancement of the GTPase activity of alpha 0, and enhancement of rhodopsin phosphorylation by the beta-adrenergic receptor kinase 1 (betaARK1). There were only moderate differences in the effects of the various beta gamma complexes alone on alpha 0, but there were marked differences in their ability to support betaARK1 catalyzed rhodopsin phosphorylation. Phosducin inhibited all beta gamma-mediated effects and showed little specificity toward specific defined beta gamma complexes with the exception of transducin-beta gamma (beta1 gamma1), which was inhibited more efficiently than the other beta gamma combinations. In a direct binding assay, there was no apparent selectivity of phosducin for any beta gamma combination tested. Thus, in contrast to betaARK1, phosducin does not appear to discriminate strongly between different G protein beta- and gamma-subunits.

@article{Muller1996, abstract = {Phosducin has recently been identified as a cytosolic protein that interacts with the beta gamma-subunits of G proteins and thereby may regulate transmembrane signaling. It is expressed predominantly in the retina but also in many other tissues, which raises the question of its potential specificity for retinal versus nonretinal beta gamma-subunits. We have therefore expressed and purified different combinations of beta- and gamma-subunits from Sf9 cells and have also purified transducin-beta gamma from bovine retina and a mixture of beta gamma complexes from bovine brain. Their interactions with phosducin were determined in a variety of assays for beta gamma function: support of ADP-ribosylation of alpha 0 by pertussis toxin, enhancement of the GTPase activity of alpha 0, and enhancement of rhodopsin phosphorylation by the beta-adrenergic receptor kinase 1 (betaARK1). There were only moderate differences in the effects of the various beta gamma complexes alone on alpha 0, but there were marked differences in their ability to support betaARK1 catalyzed rhodopsin phosphorylation. Phosducin inhibited all beta gamma-mediated effects and showed little specificity toward specific defined beta gamma complexes with the exception of transducin-beta gamma (beta1 gamma1), which was inhibited more efficiently than the other beta gamma combinations. In a direct binding assay, there was no apparent selectivity of phosducin for any beta gamma combination tested. Thus, in contrast to betaARK1, phosducin does not appear to discriminate strongly between different G protein beta- and gamma-subunits.}, added-at = {2010-12-14T18:12:02.000+0100}, author = {Muller, S. and Straub, A. and Schroder, S. and Bauer, P. H. and Lohse, M. J.}, biburl = {https://www.bibsonomy.org/bibtex/26453f27d68e94651590f308b1f8a53bf/pharmawuerz}, endnotereftype = {Journal Article}, interhash = {9bb6bbe77b3484cfec73b2eadd06895f}, intrahash = {6453f27d68e94651590f308b1f8a53bf}, issn = {0021-9258 (Print) 0021-9258 (Linking)}, journal = {J Biol Chem}, keywords = {Adenosine Animals Binding Diphosphate Eye GTP GTP-Binding Phosphohydrolases/metabolism Phosphoproteins/*metabolism Phosphorylation Protein Regulators Ribose/metabolism Sites Spodoptera Proteins/metabolism}, month = {May 17}, note = {Muller, S Straub, A Schroder, S Bauer, P H Lohse, M J Research Support, Non-U.S. Gov't United states The Journal of biological chemistry J Biol Chem. 1996 May 17;271(20):11781-6.}, number = 20, pages = {11781-6}, shorttitle = {Interactions of phosducin with defined G protein beta gamma-subunits}, timestamp = {2010-12-14T18:22:03.000+0100}, title = {Interactions of phosducin with defined G protein beta gamma-subunits}, url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=8662655}, volume = 271, year = 1996 }