3BTI: Crystal Structure Of Qacr(E58q) Bound To Berberine
reference: QacR-cation recognition is mediated by a redundancy of residues capable of charge neutralization., Peters KM, Schuman JT, Skurray RA, Brown MH, Brennan RG, Schumacher MA, Biochemistry. 2008 Aug 5;47(31):8122-9. Epub 2008 Jul 11. PMID: 18616285

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