2ch9: Difference between revisions
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==Overview== | ==Overview== | ||
Cystatins are important natural cysteine protease inhibitors targeting, primarily papain-like cysteine proteases, including cathepsins and, parasitic proteases like cruzipain, but also mammalian asparaginyl, endopeptidase. Mammalian cystatin F, which is expressed almost exclusively, in hematopoietic cells and accumulates in lysosome-like organelles, has, been implicated in the regulation of antigen presentation and other immune, processes. It is an unusual cystatin superfamily member with a, redox-regulated activation mechanism and a restricted specificity profile., We describe the 2.1A crystal structure of human cystatin F in its dimeric, "off" state. The two monomers interact in a fashion not seen before for, cystatins or cystatin-like proteins that is crucially dependent on an, unusual .. | Cystatins are important natural cysteine protease inhibitors targeting, primarily papain-like cysteine proteases, including cathepsins and, parasitic proteases like cruzipain, but also mammalian asparaginyl, endopeptidase. Mammalian cystatin F, which is expressed almost exclusively, in hematopoietic cells and accumulates in lysosome-like organelles, has, been implicated in the regulation of antigen presentation and other immune, processes. It is an unusual cystatin superfamily member with a, redox-regulated activation mechanism and a restricted specificity profile., We describe the 2.1A crystal structure of human cystatin F in its dimeric, "off" state. The two monomers interact in a fashion not seen before for, cystatins or cystatin-like proteins that is crucially dependent on an, unusual intermolecular disulfide bridge, suggesting how reduction leads to, monomer formation and activation. Strikingly, core sugars for one of the, two N-linked glycosylation sites of cystatin F are well ordered, and their, conformation and interactions with the protein indicate that this unique, feature of cystatin F may modulate its inhibitory properties, in, particular its reduced affinity toward asparaginyl endopeptidase compared, with other cystatins. | ||
==About this Structure== | ==About this Structure== | ||
2CH9 is a | 2CH9 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with NAG, ZN and ACT as [http://en.wikipedia.org/wiki/ligands ligands]. Structure known Active Site: AC6. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2CH9 OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: thiol protease inhibitor]] | [[Category: thiol protease inhibitor]] | ||
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 14:42:31 2007'' | ||
