1qdm
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CRYSTAL STRUCTURE OF PROPHYTEPSIN, A ZYMOGEN OF A BARLEY VACUOLAR ASPARTIC PROTEINASE.
OverviewOverview
We determined at 2.3 A resolution the crystal structure of prophytepsin, a zymogen of a barley vacuolar aspartic proteinase. In addition to the classical pepsin-like bilobal main body of phytepsin, we also traced most of the propeptide, as well as an independent plant-specific domain, never before described in structural terms. The structure revealed that, in addition to the propeptide, 13 N-terminal residues of the mature phytepsin are essential for inactivation of the enzyme. Comparison of the plant-specific domain with NK-lysin indicates that these two saposin-like structures are closely related, suggesting that all saposins and saposin-like domains share a common topology. Structural analysis of prophytepsin led to the identification of a putative membrane receptor-binding site involved in Golgi-mediated transport to vacuoles.
About this StructureAbout this Structure
1QDM is a Single protein structure of sequence from Hordeum vulgare. Active as Phytepsin, with EC number 3.4.23.40 Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of plant aspartic proteinase prophytepsin: inactivation and vacuolar targeting., Kervinen J, Tobin GJ, Costa J, Waugh DS, Wlodawer A, Zdanov A, EMBO J. 1999 Jul 15;18(14):3947-55. PMID:10406799
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