3HAM:
reference: The crystal structures of substrate and nucleotide complexes of Enterococcus faecium aminoglycoside-2''-phosphotransferase-IIa [APH(2'')-IIa] provide insights into substrate selectivity in the APH(2'') subfamily., Young PG, Walanj R, Lakshmi V, Byrnes LJ, Metcalf P, Baker EN, Vakulenko SB, Smith CA, J Bacteriol. 2009 Jul;191(13):4133-43. Epub 2009 May 8. PMID: 19429619

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