Bet2p and Mad2p are components of a prenyltransferase that adds geranylgeranyl onto Ypt1p and Sec4p
- PMID: 8232542
- DOI: 10.1038/366084a0
Bet2p and Mad2p are components of a prenyltransferase that adds geranylgeranyl onto Ypt1p and Sec4p
Abstract
Three different prenyltransferases have been identified in yeast and higher cells, the farnesyltransferase and the type I and type II geranylgeranyltransferases (GGTase). The farnesyltransferase and GGTase-I modify peptides in vitro with the CAAX (C, Cys; A, aliphatic residue; X, terminal amino acid) consensus motif. These enzymes are heterodimers that have different beta-subunits and a shared alpha-subunit. In yeast, the RAM2 gene encodes this alpha-subunit. RAM2 is also homologous to MAD2, a yeast gene whose product has been implicated in the feedback control of mitosis. We have shown that Bet2p is a component of the yeast GGTase-II (refs 6, 12) that geranylgeranylates Ypt1p, a small GTP-binding protein that mediates transport from the endoplasmic reticulum to the Golgi complex. Here we report that Mad2p is a component of this enzyme. Bet2p forms a complex with Mad2p that appears to bind geranylgeranyl pyrophosphate, but not farnesyl pyrophosphate. The efficient transfer of geranylgeranyl onto small GTP-binding proteins requires the presence of an additional activity.
Comment in
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Protein prenylation. Mad bet for Rab.Nature. 1993 Nov 4;366(6450):14-5. doi: 10.1038/366014a0. Nature. 1993. PMID: 8232528 No abstract available.
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