| Structural highlights
Function
MAMM_MAGGM Essential for magnetosome formation; required for stable accumulation of MamB (PubMed:22007638). May nucleate iron crystal formation (Probable). Probably binds and transports iron. Binds divalent cations, possibly up to 3 Zn(2+) per dimer in vitro, probably iron in vivo (Probable) (PubMed:30811856). One of 7 genes (mamLQBIEMO) able to induce magnetosome membrane biogenesis; coexpression of mamLQRBIEMO in a deletion of the 17 gene mamAB operon restores magnetosome vesicle formation but not magnetite biosynthesis (PubMed:27286560).[1] [2] [3] [4] [5] [6]
Publication Abstract from PubMed
Cation diffusion facilitators (CDF) are highly conserved, metal ion efflux transporters that maintain divalent transition metal cation homeostasis. Most CDF proteins contain two domains, the cation transporting transmembrane domain and the regulatory cytoplasmic C-terminal domain (CTD). MamM is a magnetosome-associated CDF protein essential for the biomineralization of magnetic iron-oxide particles in magnetotactic bacteria. To investigate the structure-function relationship of CDF cytoplasmic domains, we characterized a MamM M250P mutation that is synonymous with the disease-related mutation L349P of the human CDF protein ZnT-10. Our results show that the M250P exchange in MamM causes severe structural changes in its CTD resulting in abnormal reduced function. Our in vivo, in vitro and in silico studies indicate that the CTD fold is critical for CDF proteins' proper function and support the previously suggested role of the CDF cytoplasmic domain as a CDF regulatory element. Based on our results, we also suggest a mechanism for the effects of the ZnT-10 L349P mutation in human.
Disease-Homologous Mutation in the Cation Diffusion Facilitator Protein MamM Causes Single-Domain Structural Loss and Signifies Its Importance.,Barber-Zucker S, Uebe R, Davidov G, Navon Y, Sherf D, Chill JH, Kass I, Bitton R, Schuler D, Zarivach R Sci Rep. 2016 Aug 23;6:31933. doi: 10.1038/srep31933. PMID:27550551[7]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Uebe R, Junge K, Henn V, Poxleitner G, Katzmann E, Plitzko JM, Zarivach R, Kasama T, Wanner G, Pósfai M, Böttger L, Matzanke B, Schüler D. The cation diffusion facilitator proteins MamB and MamM of Magnetospirillum gryphiswaldense have distinct and complex functions, and are involved in magnetite biomineralization and magnetosome membrane assembly. Mol Microbiol. 2011 Nov;82(4):818-35. PMID:22007638 doi:10.1111/j.1365-2958.2011.07863.x
- ↑ Raschdorf O, Forstner Y, Kolinko I, Uebe R, Plitzko JM, Schüler D. Genetic and Ultrastructural Analysis Reveals the Key Players and Initial Steps of Bacterial Magnetosome Membrane Biogenesis. PLoS Genet. 2016 Jun 10;12(6):e1006101. PMID:27286560 doi:10.1371/journal.pgen.1006101
- ↑ Barber-Zucker S, Hall J, Mangapuram SV, Kass I, Kolusheva S, MacMillan F, Zarivach R, Henn A. Metal binding to the dynamic cytoplasmic domain of the cation diffusion facilitator (CDF) protein MamM induces a 'locked-in' configuration. FEBS J. 2019 Feb 27. doi: 10.1111/febs.14795. PMID:30811856 doi:https://dx.doi.org/10.1111/febs.14795
- ↑ Uebe R, Junge K, Henn V, Poxleitner G, Katzmann E, Plitzko JM, Zarivach R, Kasama T, Wanner G, Pósfai M, Böttger L, Matzanke B, Schüler D. The cation diffusion facilitator proteins MamB and MamM of Magnetospirillum gryphiswaldense have distinct and complex functions, and are involved in magnetite biomineralization and magnetosome membrane assembly. Mol Microbiol. 2011 Nov;82(4):818-35. PMID:22007638 doi:10.1111/j.1365-2958.2011.07863.x
- ↑ Zeytuni N, Uebe R, Maes M, Davidov G, Baram M, Raschdorf O, Nadav-Tsubery M, Kolusheva S, Bitton R, Goobes G, Friedler A, Miller Y, Schuler D, Zarivach R. Cation diffusion facilitators transport initiation and regulation is mediated by cation induced conformational changes of the cytoplasmic domain. PLoS One. 2014 Mar 21;9(3):e92141. doi: 10.1371/journal.pone.0092141. eCollection, 2014. PMID:24658343 doi:https://dx.doi.org/10.1371/journal.pone.0092141
- ↑ Zeytuni N, Uebe R, Maes M, Davidov G, Baram M, Raschdorf O, Friedler A, Miller Y, Schuler D, Zarivach R. Bacterial Magnetosome Biomineralization - A Novel Platform to Study Molecular Mechanisms of Human CDF-Related Type-II Diabetes. PLoS One. 2014 May 12;9(5):e97154. doi: 10.1371/journal.pone.0097154. eCollection, 2014. PMID:24819161 doi:https://dx.doi.org/10.1371/journal.pone.0097154
- ↑ Barber-Zucker S, Uebe R, Davidov G, Navon Y, Sherf D, Chill JH, Kass I, Bitton R, Schuler D, Zarivach R. Disease-Homologous Mutation in the Cation Diffusion Facilitator Protein MamM Causes Single-Domain Structural Loss and Signifies Its Importance. Sci Rep. 2016 Aug 23;6:31933. doi: 10.1038/srep31933. PMID:27550551 doi:https://dx.doi.org/10.1038/srep31933
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