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7pck

From Proteopedia

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[[Image:7pck.gif|left|200px]]
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{{STRUCTURE_7pck| PDB=7pck | SCENE= }}
{{STRUCTURE_7pck| PDB=7pck | SCENE= }}
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'''CRYSTAL STRUCTURE OF WILD TYPE HUMAN PROCATHEPSIN K'''
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===CRYSTAL STRUCTURE OF WILD TYPE HUMAN PROCATHEPSIN K===
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==Overview==
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Cathepsin K is a lysosomal cysteine protease belonging to the papain superfamily. It has been implicated as a major mediator of osteoclastic bone resorption. Wild-type human procathepsin K has been crystallized in a glycosylated and a deglycosylated form. The latter crystals diffract better, to 3.2 A resolution, and contain four molecules in the asymmetric unit. The structure was solved by molecular replacement and refined to an R-factor of 0.194. The N-terminal fragment of the proregion forms a globular domain while the C-terminal segment is extended and shows substantial flexibility. The proregion interacts with the enzyme along the substrate binding groove and along the proregion binding loop (residues Ser138-Asn156). It binds to the active site in the opposite direction to that of natural substrates. The overall binding mode of the proregion to cathepsin K is similar to that observed in cathepsin L, caricain, and cathepsin B, but there are local differences that likely contribute to the specificity of these proregions for their cognate enzymes. The main observed difference is in the position of the short helix alpha3p (67p-75p), which occupies the S' subsites. As in the other proenzymes, the proregion utilizes the S2 subsite for anchoring by placing a leucine side chain there, according to the specificity of cathepsin K toward its substrate.
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The line below this paragraph, {{ABSTRACT_PUBMED_10048321}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 10048321 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10048321}}
==About this Structure==
==About this Structure==
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[[Category: Procathepsin k]]
[[Category: Procathepsin k]]
[[Category: Proregion]]
[[Category: Proregion]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:47:03 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Jul 3 14:46:32 2008''

Revision as of 11:46, 3 July 2008

Image:7pck.png

Template:STRUCTURE 7pck

CRYSTAL STRUCTURE OF WILD TYPE HUMAN PROCATHEPSIN K

Template:ABSTRACT PUBMED 10048321

About this Structure

7PCK is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure of wild-type human procathepsin K., Sivaraman J, Lalumiere M, Menard R, Cygler M, Protein Sci. 1999 Feb;8(2):283-90. PMID:10048321

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