In silicio identification of glycosyl-phosphatidylinositol-anchored plasma-membrane and cell wall proteins of Saccharomyces cerevisiae

Yeast. 1997 Dec;13(15):1477-89. doi: 10.1002/(SICI)1097-0061(199712)13:15<1477::AID-YEA184>3.0.CO;2-L.

Abstract

Use of the Von Heijne algorithm allowed the identification of 686 open reading frames (ORFs) in the genome of Saccharomyces cerevisiae that encode proteins with a potential N-terminal signal sequence for entering the secretory pathway. On further analysis, 51 of these proteins contain a potential glycosyl-phosphatidylinositol (GPI)-attachment signal. Seven additional ORFs were found to belong to this group. Upon examination of the possible GPI-attachment sites, it was found that in yeast the most probable amino acids for GPI-attachment as asparagine and glycine. In yeast, GPI-proteins are found at the cell surface, either attached to the plasma-membrane or as an intrinsic part of the cell wall. It was noted that plasma-membrane GPI-proteins possess a dibasic residue motif just before their predicted GPI-attachment site. Based on this, and on homologies between proteins, families of plasma-membrane and cell wall proteins were assigned, revealing 20 potential plasma-membrane and 38 potential cell wall proteins. For members of three plasma-membrane protein families, a function has been described. On the other hand, most of the cell wall proteins seem to be structural components of the wall, responsive to different growth conditions. The GPI-attachment site of yeast slightly differs from mammalian cells. This might be of use in the development of anti-fungal drugs.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Cell Membrane*
  • Cell Wall*
  • Fungal Proteins / classification
  • Fungal Proteins / genetics*
  • Genome, Fungal
  • Glycosylphosphatidylinositols*
  • Membrane Proteins / genetics
  • Molecular Sequence Data
  • Phylogeny
  • Protein Processing, Post-Translational / genetics
  • Protein Sorting Signals / genetics
  • Saccharomyces cerevisiae / genetics*
  • Sequence Analysis*

Substances

  • Fungal Proteins
  • Glycosylphosphatidylinositols
  • Membrane Proteins
  • Protein Sorting Signals