1887

Abstract

Glycosylphosphatidylinositols (GPIs) are essential for viability in yeast and have key roles in cell wall construction. Assembly of GPIs includes the addition of a fourth, side-branching mannose (Man) to the third Man of the core GPI glycan by the Smp3 mannosyltransferase. The gene from the human pathogenic fungus has been cloned. complements the inviable null mutant and, when expressed in an / double mutant, it permits conversion of the Man-GPI precursor that accumulates in that mutant to a Man-GPI. One allele of was disrupted using the ura-blaster procedure, then the remaining allele was placed under the control of the glucose-repressible promoter. Repression of expression leads to accumulation of a GPI precursor glycolipid whose glycan headgroup contains three mannoses and bears a phosphodiester-linked substituent on its first Man. Under repressing conditions, cells exhibited morphological and cell wall defects and became inviable. CaSmp3p therefore adds a fourth, 1,2-linked Man to trimannosyl GPI precursors in and is necessary for viability. Because addition of a fourth Man to GPIs is of less relative importance in mammals, Smp3p is a potential antifungal target.

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2004-10-01
2024-03-29
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