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Nutritional Immunity: Homology Modeling of Nramp Metal Import

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

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 Mn 2+ 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.

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Acknowledgments

I thank past and present lab members for their contribution to this work and Matthias Quick for his comments. This work was supported in part by the Fond pour la Recherche en Santé du Québec and the Canadian Institutes of Health Research.

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Correspondence to Mathieu F. M. Cellier .

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Cellier, M.F. (2012). Nutritional Immunity: Homology Modeling of Nramp Metal Import. In: Lambris, J., Hajishengallis, G. (eds) Current Topics in Innate Immunity II. Advances in Experimental Medicine and Biology, vol 946. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-0106-3_19

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