Suppression of oxidative damage by Saccharomyces cerevisiae ATX2, which encodes a manganese-trafficking protein that localizes to Golgi-like vesicles.

Abstract:

:Oxygen toxicity in Saccharomyces cerevisiae lacking the copper/zinc superoxide dismutase (SOD1) can be suppressed by overexpression of the S. cerevisiae ATX2 gene. Multiple copies of ATX2 were found to reverse the aerobic auxotrophies of sod1(delta) mutants for lysine and methionine and also to enhance the resistance of these yeast strains to paraquat and atmospheric levels of oxygen. ATX2 encodes a novel 34.4-kDa polypeptide with a number of potential membrane-spanning domains. Our studies indicate that Atx2p localizes to the membrane of a vesicular compartment in yeast cells reminiscent of the Golgi apparatus. With indirect immunofluorescence microscopy, Atx2p exhibited a punctate pattern of staining typical of the Golgi apparatus, and upon subcellular fractionation, Atx2p colocalized with a biochemical marker for the yeast Golgi apparatus. We demonstrate here that this vesicle protein normally functions in the homeostasis of manganese ions and that this role in metal metabolism is necessary for the ATX1 suppression of SOD1 deficiency. First, overexpression of ATX2 caused cells to accumulate increased levels of manganese. Second, a deletion in ATX2 caused a decrease in the apparent available level of intracellular manganese and caused sod1(delta) mutants to become dependent upon exogenous manganese for aerobic growth. Third, ATX2 was incapable of suppressing oxidative damage in cells depleted of manganese ions or lacking the plasma membrane transporter for manganese. The effect of ATX2 overexpression on manganese accumulation and oxygen resistance is similar to what we have previously reported for mutations in PMR1, which encodes a manganese-trafficking protein that also resides in a vesicular compartment. Our studies are consistent with a model in which Atx2p and Pmr1p work in opposite directions to control manganese homeostasis.

journal_name

Mol Cell Biol

authors

Lin SJ,Culotta VC

doi

10.1128/mcb.16.11.6303

subject

Has Abstract

pub_date

1996-11-01 00:00:00

pages

6303-12

issue

11

eissn

0270-7306

issn

1098-5549

journal_volume

16

pub_type

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