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    Proc Natl Acad Sci U S A. 1991 Jan 1;88(1):286-90.

    Membrane-binding domain of the small G protein G25K contains an S-(all-trans-geranylgeranyl)cysteine methyl ester at its carboxyl terminus.

    Yamane HK, Farnsworth CC, Xie HY, Evans T, Howald WN, Gelb MH, Glomset JA, Clarke S, Fung BK.

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    Jules Stein Eye Institute, University of California, Los Angeles 90024.

    Abstract

    We showed previously that a 23-kDa guanine nucleotide-binding protein (G protein) purified from bovine brain membranes is carboxyl methylated and that this modification occurs at or near the membrane-binding domain. In the present study, we identified this small G protein as G25K (formerly termed Gp). We demonstrated that proteolytic digests of 3H-methylated G25K contained radiolabeled material that coeluted with synthetic S-(geranylgeranyl)cysteine methyl ester on reversed-phase HPLC. Further treatment by performic acid oxidation yielded radiolabeled material that coeluted with L-cysteic acid methyl ester, verifying that the isoprenoid moiety and carboxyl methyl ester are localized on a C-terminal cysteine residue. Analysis by gas chromatography-coupled mass spectrometry of material released from purified G25K by Raney nickel treatment positively identified the covalently bound lipid as an all-trans-geranylgeranyl (C20) isoprenoid moiety. These results suggest that geranylgeranyl modification and perhaps methyl esterification function in the membrane localization of this small G protein.

    PMID:
    1898776
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC50795
    Free PMC Article

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