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1lmw

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[[Image:1lmw.gif|left|200px]]
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[[Image:1lmw.png|left|200px]]
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{{STRUCTURE_1lmw| PDB=1lmw | SCENE= }}
{{STRUCTURE_1lmw| PDB=1lmw | SCENE= }}
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'''LMW U-PA STRUCTURE COMPLEXED WITH EGRCMK (GLU-GLY-ARG CHLOROMETHYL KETONE)'''
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===LMW U-PA STRUCTURE COMPLEXED WITH EGRCMK (GLU-GLY-ARG CHLOROMETHYL KETONE)===
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==Overview==
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BACKGROUND: Urokinase-type plasminogen activator (u-PA) promotes fibrinolysis by catalyzing the conversion of plasminogen to the active protease plasmin via the cleavage of a peptide bond. When localized to the external cell surface it contributes to tissue remodelling and cellular migration; inhibition of its activity impedes the spread of cancer. u-PA has three domains: an N-terminal receptor-binding growth factor domain, a central kringle domain and a C-terminal catalytic protease domain. The biological roles of the fibrinolytic enzymes render them therapeutic targets, however, until now no structure of the protease domain has been available. Solution of the structure of the u-PA serine protease was undertaken to provide such data. RESULTS: The crystal structure of the catalytic domain of recombinant, non-glycosylated human u-PA, complexed with the inhibitor Glu-Gly-Arg chloromethyl ketone (EGRcmk), has been determined at a nominal resolution of 2.5 A and refined to a crystallographic R-factor of 22.4% on all data (20.4% on data &gt; 3 sigma). The enzyme has the expected topology of a trypsin-like serine protease. CONCLUSIONS: The enzyme has an S1 specificity pocket similar to that of trypsin, a restricted, less accessible, hydrophobic S2 pocket and a solvent-accessible S3 pocket which is capable of accommodating a wide range of residues. The EGRcmk inhibitor binds covalently at the active site to form a tetrahedral hemiketal structure. Although the overall structure is similar to that of homologous serine proteases, at six positions insertions of extra residues in loop regions create unique surface areas. One of these loop regions is highly mobile despite being anchored by the disulphide bridge which is characteristic of a small subset of serine proteases namely tissuetype plasminogen activator, Factor XII and Complement Factor I.
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The line below this paragraph, {{ABSTRACT_PUBMED_8591045}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 8591045 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8591045}}
==About this Structure==
==About this Structure==
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[[Category: Fibrinolysis]]
[[Category: Fibrinolysis]]
[[Category: Trypsin-like serine protease]]
[[Category: Trypsin-like serine protease]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:04:35 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 21:27:32 2008''

Revision as of 18:27, 2 July 2008

Image:1lmw.png

Template:STRUCTURE 1lmw

LMW U-PA STRUCTURE COMPLEXED WITH EGRCMK (GLU-GLY-ARG CHLOROMETHYL KETONE)

Template:ABSTRACT PUBMED 8591045

About this Structure

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

Reference

The crystal structure of the catalytic domain of human urokinase-type plasminogen activator., Spraggon G, Phillips C, Nowak UK, Ponting CP, Saunders D, Dobson CM, Stuart DI, Jones EY, Structure. 1995 Jul 15;3(7):681-91. PMID:8591045

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