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Inhibition of Human Napsin A

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The newly-discovered human aspartic proteinase, napsin A was not susceptible to protein inhibitors from potato, squash or yeast but was weakly inhibited by the 17 kDa polypeptide from Ascaris lumbricoides and potently by isovaleryl and lactoyl-pepstatins. A series of synthetic inhibitors was also investigated which contained in the P1-P1' positions the dipeptide analogue statine or its phenylalanine or cyclohexylalanine homologues and in which the residues occupying P4-P3' were varied systematically. On this basis, the active site of napsin A can be readily distinguished from other human aspartic proteinases.

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Keywords: active site mapping; hapsin a; human aspartic proteinase; importance of s1/s3; napsin a inhibitor; selectivity of inhibition

Document Type: Review Article

Publication date: 01 February 2003

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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