3PSZ:
reference: Structural insights into quinolone antibiotic resistance mediated by pentapeptide repeat proteins: conserved surface loops direct the activity of a Qnr protein from a Gram-negative bacterium., Xiong X, Bromley EH, Oelschlaeger P, Woolfson DN, Spencer J, Nucleic Acids Res. 2011 Jan 11. PMID: 21227918

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