Cited by 42Iron Metabolism and DisordersDrug Transport and Resistance MechanismsTrace Elements in Health

Evolution of Differences in Transport Function in Slc11a Family Members

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Techau, Michala Eichner, Valdez-Taubas, Javier, Popoff, Jean-François, Francis, Richard, Seaman, Matthew, Blackwell, Jenefer M.·2007·Journal of Biological Chemistry

Abstract

Slc11a1 (formerly Nramp1) is a proton/divalent cation transporter that regulates cation homeostasis in macrophages. Slc11a2 mediates divalent cation uptake via the gut and delivery into cells. The mode of action of the two transporters remains controversial. Heterologous expression in frog oocytes shows Slc11a2 is a symporter, whereas Slc11a1 is an antiporter fluxing divalent cations against the proton gradient. This explains why Slc11a2, but not Slc11a1, can complement EGTA sensitivity in smf1Delta/smf2Delta/smf3Delta yeast. However, some studies of transport in mammalian cells suggest Slc11a1 is a symporter. We now demonstrate that Slc11a1, but not Slc11a2, complements a divalent cation stress phenotype in bsd2Delta/rer1Delta yeast. This is the first description of a yeast complementation assay for Slc11a1 function. Given the prior demonstration in frog oocytes that Slc11a1 acts as an antiporter, the most plausible interpretation of the data is that Slc11a1 is rescuing bsd2Delta/rer1Delta yeast by exporting divalent cations. Chimaeras define the N terminus, and a segment of the protein core preceding transmembrane domain 9 through transmembrane domain 12, as important in rescuing the divalent cation stress phenotype. EGTA sensitivity and divalent cation stress phenotypes in yeast expressing Slc11a orthologues show that symport activity is ancestral. Molecular changes that mediate rescue of the divalent cation stress phenotype post-date frogs and co-evolved with Slc11a1 orthologues that regulate divalent cation homeostasis in macrophages and resistance to infection in chickens and mammals.

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Crossref · 10.1074/jbc.m707057200

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Authors
Techau, M. E., Valdez-Taubas, J., Popoff, J.-F., Francis, R., Seaman, M., & Blackwell, J. M.
Affiliations
University of Cambridge (GB)
Corresponding author
Blackwell, Jenefer M.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2007-12
Volume
282
Issue
49
Pages
35646-35656
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1965487860
Cited by
42
References
70
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2022: 1 · 2021: 1 · 2020: 1 · 2018: 2 · 2017: 5 · 2016: 4 · 2015: 4 · 2014: 2 · 2013: 3 · 2012: 2
FWCI
2.34
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • UWA Profiles and Research Repository (UWA) (submittedVersion)
Funders
Wellcome Trust (065642)
Topics
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Health Sciences › Nursing › Nutrition and Dietetics › Trace Elements in Health
Keywords
SLC11A1, NRAMP1, DMT1, yeast complementation, chimaeras, macrophages
MeSH terms
Natural Resistance-associated Macrophage Protein 1, Solute Carrier Family 11, Member 2, Animals, Cations, Divalent, Chickens, Female, Genetic Complementation Test, Humans, Macrophages, Oocytes, Saccharomyces cerevisiae, Xenopus laevis, Gene Expression, Ion Transport, Protein Structure, Tertiary, Evolution, Molecular, Cation Transport Proteins, Mutant Chimeric Proteins

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