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1cjl

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{{STRUCTURE_1cjl| PDB=1cjl | SCENE= }}
{{STRUCTURE_1cjl| PDB=1cjl | SCENE= }}
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'''CRYSTAL STRUCTURE OF A CYSTEINE PROTEASE PROFORM'''
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===CRYSTAL STRUCTURE OF A CYSTEINE PROTEASE PROFORM===
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==Overview==
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Cathepsin L is a member of the papain superfamily of cysteine proteases and, like many other proteases, it is synthesized as an inactive proenzyme. Its prosegment shows little homology to that of procathepsin B, whose structure, the first for a cysteine protease proenzyme, has been determined recently. We report here the 3-D structure of a mutant of human procathepsin L determined at 2.2 A resolution, describe the mode of binding employed by the prosegment and discuss the molecular basis for other possible roles of the prosegment. The N-terminal part of the prosegment is globular and contains three alpha-helices with a small hydrophobic core built around aromatic side chains. This domain packs against a loop on the enzyme's surface, with the aromatic side chain from the prosegment being located in the center of this loop and providing a large contact area. The C-terminal portion of the prosegment assumes an extended conformation and follows along the substrate binding cleft toward the N-terminus of the mature enzyme. The direction of the prosegment in the substrate binding cleft is opposite to that of substrates. The previously described role of the prosegment in the interactions with membranes is supported by the structure of its N-terminal domain. The fold of the prosegment and the mechanism by which it inhibits the enzymatic activity of procathepsin L is similar to that observed in procathepsin B despite differences in length and sequence, suggesting that this mode of inhibition is common to all enzymes from the papain superfamily.
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(as it appears on PubMed at http://www.pubmed.gov), where 8896443 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8896443}}
==About this Structure==
==About this Structure==
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[[Category: Inhibitor]]
[[Category: Inhibitor]]
[[Category: Propeptide]]
[[Category: Propeptide]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 12:48:14 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 20:50:17 2008''

Revision as of 17:50, 30 June 2008

Image:1cjl.png

Template:STRUCTURE 1cjl

CRYSTAL STRUCTURE OF A CYSTEINE PROTEASE PROFORM

Template:ABSTRACT PUBMED 8896443

About this Structure

1CJL is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structure of human procathepsin L reveals the molecular basis of inhibition by the prosegment., Coulombe R, Grochulski P, Sivaraman J, Menard R, Mort JS, Cygler M, EMBO J. 1996 Oct 15;15(20):5492-503. PMID:8896443

Page seeded by OCA on Mon Jun 30 20:50:17 2008

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