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E. coli BtuB complex with cobalamin (a vitamin B12 derivative), lipid, methanesulfonothioate derivative and Ca+2 ions (green) (PDB code 3m8d)

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  1. Chimento DP, Kadner RJ, Wiener MC. The Escherichia coli outer membrane cobalamin transporter BtuB: structural analysis of calcium and substrate binding, and identification of orthologous transporters by sequence/structure conservation. J Mol Biol. 2003 Oct 3;332(5):999-1014. PMID:14499604 doi:
  2. Freed DM, Horanyi PS, Wiener MC, Cafiso DS. Conformational exchange in a membrane transport protein is altered in protein crystals. Biophys J. 2010 Sep 8;99(5):1604-10. PMID:20816073 doi:10.1016/j.bpj.2010.06.026

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