1fmx
STRUCTURE OF NATIVE PROTEINASE A IN THE SPACE GROUP P21STRUCTURE OF NATIVE PROTEINASE A IN THE SPACE GROUP P21
Structural highlights
FunctionCARP_YEAST Aspartyl protease implicated in the post-translational regulation of S.cerevisiae vacuolar proteinases. Acts on YSCB, on YSCY and on itself. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe structures of the native Saccharomyces cerevisiae proteinase A have been solved by molecular replacement in the monoclinic and trigonal crystal forms and refined at 2.6-2.7A resolution. These structures agree overall with those of other uninhibited aspartic proteinases. However, an unusual orientation for the side chain of Tyr75, a conserved residue on the flexible "flap" that covers the active site and is important for the activity of these enzymes, was found in the trigonal crystals. A similar conformation of Tyr75 occupying the S1 substrate-binding pocket was previously reported only for chymosin (where it was interpreted as representing a "self-inhibited" state of the enzyme), but for no other aspartic proteinases. Since this orientation of Tyr75 has now been seen in the structures of two members of the family of aspartic proteinases, it might indicate that the placement of that residue in the S1 substrate-binding pocket might have some functional significance, analogous to what was seen for self-inhibited structures of serine proteinases. An unusual orientation for Tyr75 in the active site of the aspartic proteinase from Saccharomyces cerevisiae.,Gustchina A, Li M, Phylip LH, Lees WE, Kay J, Wlodawer A Biochem Biophys Res Commun. 2002 Jul 26;295(4):1020-6. PMID:12127998[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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