4mwt
From Proteopedia
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== Function == | == Function == | ||
[[http://www.uniprot.org/uniprot/PPGB_HUMAN PPGB_HUMAN]] Protective protein appears to be essential for both the activity of beta-galactosidase and neuraminidase, it associates with these enzymes and exerts a protective function necessary for their stability and activity. This protein is also a carboxypeptidase and can deamidate tachykinins.<ref>PMID:1907282</ref> | [[http://www.uniprot.org/uniprot/PPGB_HUMAN PPGB_HUMAN]] Protective protein appears to be essential for both the activity of beta-galactosidase and neuraminidase, it associates with these enzymes and exerts a protective function necessary for their stability and activity. This protein is also a carboxypeptidase and can deamidate tachykinins.<ref>PMID:1907282</ref> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Galactosialidosis is a human lysosomal storage disease caused by deficiency in the multifunctional lysosomal protease cathepsin A (also known as protective protein/cathepsin A, PPCA, catA, HPP, and CTSA; EC 3.4.16.5). Previous structural work on the inactive precursor human cathepsin A (zymogen) led to a two-stage model for activation, where proteolysis of a 1.6-kDa excision peptide is followed by a conformational change in a blocking peptide occluding the active site. Here we present evidence for an alternate model of activation of human cathepsin A, needing only cleavage of a 3.3-kDa excision peptide to yield full enzymatic activity, with no conformational change required. We present x-ray crystallographic, mass spectrometric, amino acid sequencing, enzymatic, and cellular data to support the cleavage-only activation model. The results clarify a longstanding question about the mechanism of cathepsin A activation and point to new avenues for the design of mechanism-based inhibitors of the enzyme. | ||
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| + | Proteolytic activation of human cathepsin A.,Kolli N, Garman SC J Biol Chem. 2014 Apr 25;289(17):11592-600. doi: 10.1074/jbc.M113.524280. Epub, 2014 Mar 5. PMID:24599961<ref>PMID:24599961</ref> | ||
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| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
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| + | ==See Also== | ||
| + | *[[Cathepsin|Cathepsin]] | ||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 06:45, 15 April 2015
Crystal structure of human PPCA (trigonal crystal form 2)
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