6FHP:
reference: Destructive twisting of neutral metalloproteases: the catalysis mechanism of the Dispase autolysis-inducing protein from Streptomyces mobaraensis DSM 40487., Fiebig D, Storka J, Roeder M, Meyners C, Schmelz S, Blankenfeldt W, Scrima A, Kolmar H, Fuchsbauer HL, FEBS J. 2018 Aug 31. doi: 10.1111/febs.14647. PMID: 30171661

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