3HLX:
reference: Structural studies of mutant forms of the PQQ-forming enzyme PqqC in the presence of product and substrate., Puehringer S, Rosefigura J, Metlitzky M, Toyama H, Klinman JP, Schwarzenbacher R, Proteins. 2010 Aug 15;78(11):2554-62. PMID: 20602352

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