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The crystal structure of mjS2P from Methanocaldococcus jannaschii.112 Six transmembrane helices (TM) are shown in different colors. The catalytic zinc atom (red) is coordinated by His54 and His58 on TM2 and Asp148 at the N terminal end of helix TM4C. The conserved Glu55 and Asn140 may contribute to catalysis.
