Reference: Zhao Y, et al. (2016) Vcx1-D1 (M383I), the Vcx1 mutant with a calcineurin-independent vacuolar Ca(2+)/H(+) exchanger activity, confers calcineurin-independent Mn(2+) tolerance in Saccharomyces cerevisiae. Can J Microbiol 62(6):475-84

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Abstract


The Vcx1-M1 mutant is known to confer calcineurin-dependent Mn(2+) tolerance in budding yeast. Here, we demonstrate that another Vcx1 mutant, Vcx1-D1 with calcineurin-independent vacuolar Ca(2+)/H(+) exchanger activity, confers calcineurin-independent Mn(2+) tolerance. Unlike Vcx1-M1, the Mn(2+) tolerance conferred by Vcx1-D1 is dependent on the presence of Pmr1 or Pmc1. The Pmr1-dependent Mn(2+) tolerance of Vcx1-D1 requires the presence of calcineurin but not the functioning of the Ca(2+)/calcineurin signaling pathway. Similar to the wild-type Vcx1, C-terminally green fluorescent protein tagged Vcx1-D1 and Vcx1-M1 mutants localize to the endoplasmic reticulum instead of its normal vacuolar destination, but they remain functional in Ca(2+) sensitivity and Mn(2+) tolerance.

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Journal Article
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Zhao Y, Xu H, Zhang Y, Jiang L
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