5KTE:
reference: Crystal Structure and Conformational Change Mechanism of a Bacterial Nramp-Family Divalent Metal Transporter., Bozzi AT, Bane LB, Weihofen WA, Singharoy A, Guillen ER, Ploegh HL, Schulten K, Gaudet R, Structure. 2016 Dec 6;24(12):2102-2114. doi: 10.1016/j.str.2016.09.017. Epub 2016, Nov 10. PMID: 27839948

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