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Mol. Cell. Biol., 01 1998, 616-628, Vol 18, No. 1
K Gotte, W Girzalsky, M Linkert, E Baumgart, S Kammerer, WH Kunau and R Erdmann
We report the identification and molecular characterization of Pex19p, an
oleic acid-inducible, farnesylated protein of 39.7 kDa that is essential
for peroxisome biogenesis in Saccharomyces cerevisiae. Cells lacking Pex19p
are characterized by the absence of morphologically detectable peroxisomes
and mislocalization of peroxisomal matrix proteins to the cytosol. The
human HK33 gene product was identified as the putative human ortholog of
Pex19p. Evidence is provided that farnesylation of Pex19p takes place at
the cysteine of the C-terminal CKQQ amino acid sequence. Farnesylation of
Pex19p was shown to be essential for the proper function of the protein in
peroxisome biogenesis. Pex19p was shown to interact with Pex3p in vivo, and
this interaction required farnesylation of Pex19p.
Copyright © 1998, American Society for Microbiology
Pex19p, a farnesylated protein essential for peroxisome biogenesis
Institut fur Physiologische Chemie, Ruhr-Universitat Bochum, Germany.
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