Dataset Information

Gbeta5 prevents the RGS7-Galphao interaction through binding to a distinct Ggamma-like domain found in RGS7 and other RGS proteins.

ABSTRACT: The G protein beta subunit Gbeta5 deviates significantly from the other four members of Gbeta-subunit family in amino acid sequence and subcellular localization. To detect the protein targets of Gbeta5 in vivo, we have isolated a native Gbeta5 protein complex from the retinal cytosolic fraction and identified the protein tightly associated with Gbeta5 as the regulator of G protein signaling (RGS) protein, RGS7. Here we show that complexes of Gbeta5 with RGS proteins can be formed in vitro from the recombinant proteins. The reconstituted Gbeta5-RGS dimers are similar to the native retinal complex in their behavior on gel-filtration and cation-exchange chromatographies and can be immunoprecipitated with either anti-Gbeta5 or anti-RGS7 antibodies. The specific Gbeta5-RGS7 interaction is determined by a distinct domain in RGS that has a striking homology to Ggamma subunits. Deletion of this domain prevents the RGS7-Gbeta5 binding, although the interaction with Galpha is retained. Substitution of the Ggamma-like domain of RGS7 with a portion of Ggamma1 changes its binding specificity from Gbeta5 to Gbeta1. The interaction of Gbeta5 with RGS7 blocked the binding of RGS7 to the Galpha subunit Galphao, indicating that Gbeta5 is a specific RGS inhibitor.

SUBMITTER: Levay K

PROVIDER: S-EPMC26814 | biostudies-literature | 1999 Mar

REPOSITORIES: biostudies-literature

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Gbeta5 prevents the RGS7-Galphao interaction through binding to a distinct Ggamma-like domain found in RGS7 and other RGS proteins.

Levay K K Cabrera J L JL Satpaev D K DK Slepak V Z VZ

Proceedings of the National Academy of Sciences of the United States of America 19990301 5

The G protein beta subunit Gbeta5 deviates significantly from the other four members of Gbeta-subunit family in amino acid sequence and subcellular localization. To detect the protein targets of Gbeta5 in vivo, we have isolated a native Gbeta5 protein complex from the retinal cytosolic fraction and identified the protein tightly associated with Gbeta5 as the regulator of G protein signaling (RGS) protein, RGS7. Here we show that complexes of Gbeta5 with RGS proteins can be formed in vitro from t ...[more]

PMID: 10051672

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Project description:BackgroundAn underlying tenet of the epigenetic code hypothesis is the existence of protein domains that can recognize various chromatin structures. To date, two major candidates have emerged: (i) the bromodomain, which can recognize certain acetylation marks and (ii) the chromodomain, which can recognize certain methylation marks.ResultsThe Epc-N (Enhancer of Polycomb-N-terminus) domain is formally defined herein. This domain is conserved across eukaryotes and is predicted to form a right-handed orthogonal four-helix bundle with extended strands at both termini. The types of amino acid residues that define the Epc-N domain suggest a role in mediating protein-protein interactions, possibly specifically in the context of chromatin binding, and the types of proteins in which it is found (known components of histone acetyltransferase complexes) strongly suggest a role in epigenetic structure formation and/or recognition. There appear to be two major Epc-N protein families that can be divided into four unique protein subfamilies. Two of these subfamilies (I and II) may be related to one another in that subfamily I can be viewed as a plant-specific expansion of subfamily II. The other two subfamilies (III and IV) appear to be related to one another by duplication events in a primordial fungal-metazoan-mycetozoan ancestor. Subfamilies III and IV are further defined by the presence of an evolutionarily conserved five-center-zinc-binding motif in the loop connecting the second and third helices of the four-helix bundle. This motif appears to consist of a PHD followed by a mononuclear Zn knuckle, followed by a PHD-like derivative, and will thus be referred to as the PZPM. All non-Epc-N proteins studied thus far that contain the PZPM have been implicated in histone methylation and/or gene silencing. In addition, an unusual phyletic distribution of Epc-N-containing proteins is observed.ConclusionThe data suggest that the Epc-N domain is a protein-protein interaction module found in chromatin associated proteins. It is possible that the Epc-N domain serves as a direct link between histone acetylation and methylation statuses. The unusual phyletic distribution of Epc-N-containing proteins may provide a conduit for future insight into how different organisms form, perceive and respond to epigenetic information.

Dataset Information

Gbeta5 prevents the RGS7-Galphao interaction through binding to a distinct Ggamma-like domain found in RGS7 and other RGS proteins.

Publications

Gbeta5 prevents the RGS7-Galphao interaction through binding to a distinct Ggamma-like domain found in RGS7 and other RGS proteins.

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