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. 1993 Sep 15;90(18):8557–8561. doi: 10.1073/pnas.90.18.8557

Isoprenylation of the plant molecular chaperone ANJ1 facilitates membrane association and function at high temperature.

J K Zhu 1, R A Bressan 1, P M Hasegawa 1
PMCID: PMC47396  PMID: 8378331

Abstract

We demonstrate that ANJ1, a higher plant homolog of the bacterial molecular chaperone DnaJ, is a substrate in vitro for protein farnesyl- and geranylgeranyl-transferase activities present in cell extracts of the plant Atriplex nummularia and yeast Saccharomyces cerevisiae. Isoprenylation did not occur when cysteine was replaced by serine in the CAQQ motif at the carboxyl terminus of ANJ1, indicating that this sequence functions as a CaaX consensus sequence for polyisoprenylation (where C is cysteine, a is an aliphatic residue, and X is any amino acid residue). Substitution of leucine for the terminal glutamine did not result in the expected geranylgeranylation as occurs with mammalian proteins containing a carboxyl-terminal leucine. Unlike the wild-type ANJ1, neither of the proteins containing these amino acid substitutions could functionally complement the yeast temperature-sensitive mutant mas5. Farnesylation enhanced the association of ANJ1 with A. nummularia microsomal membranes. Electrophoretic mobility of ANJ1 from the plant indicated that the protein is isoprenylated in vivo.

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