Molecular cloning of CWP1: a gene encoding a Saccharomyces cerevisiae cell wall protein solubilized with Rarobacter faecitabidus protease I.
A yeast cell wall glycoprotein with a molecular weight of 40,000, named gp40, was solubilized from SDS-extracted cell wall of Saccharomyces cerevisiae by incubation with Rarobacter faecitabidus protease I, which is a yeast-lytic enzyme. Based on its amino acid sequence, we cloned and sequenced the gene encoding the precursor of gp40, named CWP1; cell wall protein gene. The DNA sequence of the CWP1 gene was identical to YKL443, an open reading frame identified in a genome sequencing program for yeast chromosome XI. This gene encoded a serine-rich protein of 239 amino acids with a molecular weight of 24,267. The presence of hydrophobic sequences in the N- and C-termini of the CWP1 protein suggests that it is secreted as a glycosylphosphatidylinositol-anchored protein and is subsequently integrated into the cell wall. Since a gene disruption experiment showed no growth defect, the CWP1 gene is not essential for growth. Mutant CWP1 protein deficient in the C-terminal hydrophobic sequence was secreted into the culture medium, not anchored to the cell wall, thereby indicating that this hydrophobic sequence plays a crucial role in anchoring to the cell wall. Homology between the CWP1 protein and TIP1 family of cold shock proteins suggests that they belong to a new family of cell wall proteins.
National Research Institute of Brewing, Tokyo.
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Iimura
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D000595:Amino Acid Sequence; D001419:Bacteria / Q000201:enzymology*; D001483:Base Sequence; D002473:Cell Wall / Q000378:metabolism*; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D018076:DNA, Complementary; D010450:Endopeptidases / Q000378:metabolism*; D006093:Gram-Positive Asporogenous Rods / Q000201:enzymology; D008562:Membrane Glycoproteins / Q000235:genetics*; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000235:genetics*; D011498:Protein Precursors / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D014158:Transcription, Genetic
C093810:CWP1 protein, S cerevisiae; D018076:DNA, Complementary; D008562:Membrane Glycoproteins; D010446:Peptide Fragments; D011498:Protein Precursors; D029701:Saccharomyces cerevisiae Proteins; D010450:Endopeptidases