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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kaplan, Jerry Jia, Xuan Li, Liangtao Ward, Diane M. Miao, Ren |
| Description | Author Affiliation: Li L ( From the Department of Pathology, School of Medicine, University of Utah, Salt Lake City, Utah 84132.); Miao R ( From the Department of Pathology, School of Medicine, University of Utah, Salt Lake City, Utah 84132.); Jia X ( From the Department of Pathology, School of Medicine, University of Utah, Salt Lake City, Utah 84132.); Ward DM ( From the Department of Pathology, School of Medicine, University of Utah, Salt Lake City, Utah 84132.); Kaplan J ( From the Department of Pathology, School of Medicine, University of Utah, Salt Lake City, Utah 84132 jerry.kaplan@path.utah.edu.) |
| Abstract | Mmt1 and Mmt2 are highly homologous yeast members of the cation diffusion facilitator transporter family localized to mitochondria. Overexpression of MMT1/2 led to changes in cellular metal homeostasis (increased iron sensitivity, decreased cobalt sensitivity, increased sensitivity to copper), oxidant generation, and increased sensitivity to H2O2. The phenotypes due to overexpression of MMT1&2 were similar to that seen in cells with deletions in MRS3 and MRS4, genes that encode the mitochondrial iron importers. Overexpression of MMT1&2 resulted in induction of the low iron transcriptional response, similar to that seen in Δmrs3Δmr4 cells. This low iron transcriptional response was suppressed by deletion of CCC1, the gene that encodes the vacuolar iron importer. Measurement of the activity of the iron-dependent gentisate 1,2-dioxygenase from Pseudaminobacter salicylatoxidans expressed in yeast cytosol, showed that changes in Mmt1/2 levels affected cytosol iron concentration even in the absence of Ccc1. Overexpression of MMT1 resulted in increased cytosolic iron whereas deletion of MMT1/MMT2 led to decreased cytosolic iron. These results support the hypothesis that Mmt1/2 function as mitochondrial iron exporters. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 24 |
| Volume Number | 289 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2014-06-13 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cation Transport Proteins Metabolism Mitochondrial Proteins Saccharomyces Cerevisiae Proteins Saccharomyces Cerevisiae Genetics Cytoplasm Homeostasis Ion Transport Mitochondria Research Support, N.I.H., Extramural Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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