4UBQ:
reference: Crystal structure of IMP-2 metallo-beta-lactamase from Acinetobacter spp.: comparison of active-site loop structures between IMP-1 and IMP-2., Yamaguchi Y, Matsueda S, Matsunaga K, Takashio N, Toma-Fukai S, Yamagata Y, Shibata N, Wachino J, Shibayama K, Arakawa Y, Kurosaki H, Biol Pharm Bull. 2015;38(1):96-101. doi: 10.1248/bpb.b14-00594. PMID: 25744464

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