Current Topics in Innate Immunity II pp 335-351

Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 946)

Nutritional Immunity: Homology Modeling of Nramp Metal Import

Chapter

Abstract

The Natural resistance-associated macrophage proteins (Nramp1 and 2) are proton-dependent solute carriers of divalent metals such as Fe2+ and Mn2+ (Slc11a1 and 2). Their expression in both resting and microbicidal macrophages which metabolize iron differently, raises questions about Nramp mechanism of Me2+ transport and its impact in distinct phenotypic contexts. We developed a low resolution 3D model for Slc11 based on detailed phylogeny and remote homology threading using Escherichia coli Nramp homolog (proton-dependent Mn2+transporter, MntH) as experimental system. The predicted fold is consistent with determinations of transmembrane topology and activity; it indicates Slc11 carriers are part of the LeuT superfamily. Homology implies that inverted structural symmetry facilitates Slc11 H+-driven Me2+ import and provides a 3D framework to test structure-activity relationships in macrophages and study functional evolution of MntH/Nramp (Slc11) carriers.

Keywords

Nramp (natural resistance-associated macrophage protein) Phagosome Proton-dependent efflux Divalent metals (Fe2+, Mn2+,…) Membrane transport Homology threading Phylogeny Structure 3D Inverted symmetry 

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© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.INRS-Institut Armand-FrappierInstitut National de la Recherche ScientifiqueLavalCanada

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