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Gene Review

FIG2  -  Fig2p

Saccharomyces cerevisiae S288c

Synonyms: Cell wall adhesin FIG2, Factor-induced gene 2 protein, YCR089W, YCR1102, YCR89W
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High impact information on FIG2

  • Fig1p and Fig2p are likely to act at the cell surface as Fig1:: beta-gal and Fig2::beta-gal fusion proteins localize to the periphery of mating cells [1].
  • Three of the proteins encoded by these genes, Fig1p, Fig2p, and Fig4p, are dispensible for cell polarization in uniform concentrations of mating pheromone, but are required for normal cell polarization in mating mixtures, conditions that involve cell-cell communication [1].
  • The ability of Flo11p to supply Fig2p function in mating depends on its intracellular localization to the mating projection, where Fig2p normally functions in the adhesion of mating cells [2].
  • Finally, we show that fig2delta zygotes also have defects in zygotic spindle positioning that are osmoremedial, whereas the requirements for FIG2 in normal cell-cell agglutination and cell fusion during mating are insensitive to changes in the extracellular osmotic environment [3].
  • We conclude that FIG2 performs distinct functions in the mating cell wall that are separable with respect to their ability to be suppressed by changes in external osmolarity and that a fundamental role of FIG2 in mating cells is the maintenance of cell integrity [3].

Biological context of FIG2

  • Fig1p and Fig2p are also important for cell fusion and conjugation bridge shape, respectively [1].
  • For example, Flo11p is required during vegetative growth for haploid invasion and diploid filamentation, whereas Fig2p is required for mating [2].
  • These results imply that Fig2p is an indirect masker of the active sites in alpha-agglutinin [4].

Anatomical context of FIG2

  • Cells lacking FIG2 possess a variety of mating defects that relate to processes involving the cell wall, including morphogenetic defects, cell fusion defects, and alterations in agglutination activities [3].


  1. Pheromone-regulated genes required for yeast mating differentiation. Erdman, S., Lin, L., Malczynski, M., Snyder, M. J. Cell Biol. (1998) [Pubmed]
  2. A Saccharomyces gene family involved in invasive growth, cell-cell adhesion, and mating. Guo, B., Styles, C.A., Feng, Q., Fink, G.R. Proc. Natl. Acad. Sci. U.S.A. (2000) [Pubmed]
  3. Maintenance of mating cell integrity requires the adhesin Fig2p. Zhang, M., Bennett, D., Erdman, S.E. Eukaryotic Cell (2002) [Pubmed]
  4. Role of Fig2p in agglutination in Saccharomyces cerevisiae. Jue, C.K., Lipke, P.N. Eukaryotic Cell (2002) [Pubmed]
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