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Bgs2p, a 1,3‐β‐glucan synthase subunit, is essential for maturation of ascospore wall in Schizosaccharomyces pombe
Author(s) -
Liu Jianhua,
Tang Xie,
Wang Hongyan,
Balasubramanian Mohan
Publication year - 2000
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(00)01828-7
Subject(s) - schizosaccharomyces pombe , ascospore , biology , ascus (bryozoa) , meiosis , mutant , meiosis ii , spore , schizosaccharomyces , saccharomyces cerevisiae , microbiology and biotechnology , yeast , botany , genetics , gene
Previously we have reported that Drc1p/Cps1p, a 1,3‐β‐glucan synthase subunit, is essential for division septum assembly in Schizosaccharomyces pombe . In this report, we present evidence that S. pombe Bgs2p, a 1,3‐β‐glucan synthase that shows 56% identity to Drc1p/Cps1p, is essential for maturation of ascospore wall in S. pombe , but is not required for vegetative growth. Diploid cells homozygous for the bgs2 ‐null mutation, as well as homothallic bgs2 ‐null mutant haploids undergo meiosis normally. However, a 1,3‐β‐glucan containing spore wall is not assembled in these cells. The spores resulting from meiosis of a bgs2 ‐null mutant lyse upon release from the ascus and are therefore inviable. Using a green fluorescent protein‐tagged Bgs2p, we demonstrate that Bgs2p is localized at the periphery of the ascospores during meiosis and sporulation. However, Bgs2p is not detected in vegetative cells. We conclude that Bgs2p is required for 1,3‐β‐glucan synthesis during ascospore wall maturation.