Abstract:A new polypeptide backbone fold for serine proteases has been identified based on the crystal structure ofhmnan cytomcgalovi.J.us protease. The structure was detem1ined at 2.5A resolution by the multiplewavelength anomalous diJ'fraction technique using the seleno-methionyl protein and refined at 2.0A resolution. It reveals a seven-stnmded mostly-antipm·allel 13-ban·eL which is sunounded by seven helices. The active site residues (Ser-132 and His-63) m·e situated on the outside of the 13-bmrel and in a groove o… Show more
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