Rab geranylgeranyl transferase: A multisubunit enzyme that prenylates GTP-binding proteins terminating in Cys-X-Cys or Cys-Cys

Miguel C. Seabra, Joseph L. Goldstein, Thomas C. Südhof, Michael S. Brown

Research output: Contribution to journalArticle

253 Citations (Scopus)

Abstract

Rab proteins are membrane-bound prenylated GTP-binding proteins required for the targeted movement of membrane vesicles from one organelle to another. In the current paper we have characterized and purified an enzyme that attaches geranylgeranyl residues to Rab proteins that bear the COOH-terminal sequence Cys-X-Cys (such as Rab3A) and Cys-Cys (such as Rab1A). This enzyme is designated Rab geranylgeranyl transferase (Rab GG transferase). At high salt concentrations, Rab GG transferase from rat brain cytosol separates into two components, designated A and B, both of which are required for activity. We purified Component B to apparent homogeneity and found that it contains two peptides of 60 and 38 kDa. The purified Rab GG transferase did not attach geranylgeranyl to p21H-ras-CVLL, which is prenylated by a GG transferase of the CAAX type that resembles the CAAX farnesyltransferase. Rab GG transferase was strongly inhibited by Zn2+, a cation that is absolutely required by farnesyltransferase. The Rab GG transferase was also inhibited by NaCl concentrations in excess of 100 mM. Together with previous data, the current findings indicate that mammalian cells possess at least three protein prenyltransferases (CAAX farnesyltransferase, CAAX GG transferase, and Rab GG transferase) that are specific for different classes of low molecular weight GTP-binding proteins and other proteins.

Original languageEnglish (US)
Pages (from-to)14497-14503
Number of pages7
JournalJournal of Biological Chemistry
Volume267
Issue number20
StatePublished - Jul 15 1992

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cysteinylcysteine
GTP-Binding Proteins
Enzymes
Dimethylallyltranstransferase
Farnesyltranstransferase
Proteins
Transferases
Organelles
Cytosol
Rab geranylgeranyltransferase
Cations
Rats
Brain
Membrane Proteins
Salts
Molecular Weight
Molecular weight
Cells
Membranes
Peptides

ASJC Scopus subject areas

  • Biochemistry

Cite this

Rab geranylgeranyl transferase : A multisubunit enzyme that prenylates GTP-binding proteins terminating in Cys-X-Cys or Cys-Cys. / Seabra, Miguel C.; Goldstein, Joseph L.; Südhof, Thomas C.; Brown, Michael S.

In: Journal of Biological Chemistry, Vol. 267, No. 20, 15.07.1992, p. 14497-14503.

Research output: Contribution to journalArticle

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AB - Rab proteins are membrane-bound prenylated GTP-binding proteins required for the targeted movement of membrane vesicles from one organelle to another. In the current paper we have characterized and purified an enzyme that attaches geranylgeranyl residues to Rab proteins that bear the COOH-terminal sequence Cys-X-Cys (such as Rab3A) and Cys-Cys (such as Rab1A). This enzyme is designated Rab geranylgeranyl transferase (Rab GG transferase). At high salt concentrations, Rab GG transferase from rat brain cytosol separates into two components, designated A and B, both of which are required for activity. We purified Component B to apparent homogeneity and found that it contains two peptides of 60 and 38 kDa. The purified Rab GG transferase did not attach geranylgeranyl to p21H-ras-CVLL, which is prenylated by a GG transferase of the CAAX type that resembles the CAAX farnesyltransferase. Rab GG transferase was strongly inhibited by Zn2+, a cation that is absolutely required by farnesyltransferase. The Rab GG transferase was also inhibited by NaCl concentrations in excess of 100 mM. Together with previous data, the current findings indicate that mammalian cells possess at least three protein prenyltransferases (CAAX farnesyltransferase, CAAX GG transferase, and Rab GG transferase) that are specific for different classes of low molecular weight GTP-binding proteins and other proteins.

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