1PO3: Crystal Structure Of Ferric Citrate Transporter Feca In Comp Ferric Citrate
reference: Structural evidence for iron-free citrate and ferric citrate binding to the TonB-dependent outer membrane transporter FecA., Yue WW, Grizot S, Buchanan SK, J Mol Biol 2003 Sep 12;332(2):353-68. PMID: 12948487

This OCA Structure page
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