Cryptococcus neoformans Ca(2+) homeostasis requires a chloride channel/antiporter Clc1 in JEC21, but not in H99.

Abstract:

:CLC-type chloride/proton antiporters are required for copper/iron homeostasis in fungi. A relationship between CLCs and Ca(2+) homeostasis has not been found before. Here we demonstrate the requirement of the antiporter CLC1 for Ca(2+) homeostasis/signaling in Cryptococcus neoformans. The deletion of CLC1 in JEC21 resulted in a mutant hypersensitive to cyclosporine A, an inhibitor of calcineurin. Intracellular Ca(2+) deficiency in the mutant Tx1 was confirmed with Fluo-3 staining epi-fluorescence microscopy. Tx1 failed to grow at elevated temperature and in SDS and displayed defects in cell wall integrity and cell separation. This defective phenotype is because of Ca(2+) deficiency that was restorable by exogenous Ca(2+) . In contrast, H99 CLC1 was dispensable for Ca(2+) homeostasis and had no comparable defective consequences if deleted, suggesting divergent roles of CLCs in Ca(2+) homeostasis. Distinct Ca(2+) homeostasis mechanisms may contribute the virulence difference between the two strains. This work reveals a novel action of CLC antiporters in fungi and may provide information as to the evolution of pathogenicity among cryptococcal strains.

journal_name

FEMS Yeast Res

journal_title

FEMS yeast research

authors

Li D,Zhang X,Li Z,Yang J,Pan J,Zhu X

doi

10.1111/j.1567-1364.2011.00763.x

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

69-77

issue

1

eissn

1567-1356

issn

1567-1364

journal_volume

12

pub_type

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