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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

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.[1]

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