1887

Abstract

GDP-mannose pyrophosphorylase (GMPP) catalyses the synthesis of GDP-mannose, which is the precursor for the mannose residues in glycoconjugates, using mannose 1-phosphate and GTP as substrates. Repression of GMPP in yeast leads to phenotypes including cell lysis, defective cell wall, and failure of polarized growth and cell separation. Although several GMPPs have been isolated and characterized in filamentous fungi, the physiological consequences of their actions are not clear. In this study, Af, which is a homologue of yeast //, was identified in the genome. The Af gene was expressed in , and recombinant AfSrb1 was functionally confirmed as a GMPP. By the replacement of the native Af promoter with an inducible promoter, the conditional inactivation mutant strain YJ-gmpp was constructed. The presence of 3 % glucose completely blocked transcription of P–Af, and was lethal to strain YJ-gmpp. Repression of Af expression in strain YJ-gmpp led to phenotypes including hyphal lysis, defective cell wall, impaired polarity maintenance, and branching site selection. Also, rapid germination and reduced conidiation were documented. However, in contrast to yeast, strain YJ-gmpp retained the ability to direct polarity establishment and septation. Our results showed that the Af gene is essential for cell wall integrity, morphogenesis and viability of

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2008-09-01
2020-04-10
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