The crystal structure of the catalytic domain of human urokinase-type plasminogen activator.
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; inhibi...
| Main Authors: | , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1995
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| _version_ | 1826290806299820032 |
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| author | Spraggon, G Phillips, C Nowak, UK Ponting, C Saunders, D Dobson, C Stuart, D Jones, E |
| author_facet | Spraggon, G Phillips, C Nowak, UK Ponting, C Saunders, D Dobson, C Stuart, D Jones, E |
| author_sort | Spraggon, G |
| collection | OXFORD |
| description | 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 > 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. |
| first_indexed | 2024-03-07T02:49:49Z |
| format | Journal article |
| id | oxford-uuid:ad4baf0e-3f13-4218-9477-b2d0a9b0e6b4 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:49:49Z |
| publishDate | 1995 |
| record_format | dspace |
| spelling | oxford-uuid:ad4baf0e-3f13-4218-9477-b2d0a9b0e6b42022-03-27T03:34:40ZThe crystal structure of the catalytic domain of human urokinase-type plasminogen activator.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ad4baf0e-3f13-4218-9477-b2d0a9b0e6b4EnglishSymplectic Elements at Oxford1995Spraggon, GPhillips, CNowak, UKPonting, CSaunders, DDobson, CStuart, DJones, EBACKGROUND: 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 > 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. |
| spellingShingle | Spraggon, G Phillips, C Nowak, UK Ponting, C Saunders, D Dobson, C Stuart, D Jones, E The crystal structure of the catalytic domain of human urokinase-type plasminogen activator. |
| title | The crystal structure of the catalytic domain of human urokinase-type plasminogen activator. |
| title_full | The crystal structure of the catalytic domain of human urokinase-type plasminogen activator. |
| title_fullStr | The crystal structure of the catalytic domain of human urokinase-type plasminogen activator. |
| title_full_unstemmed | The crystal structure of the catalytic domain of human urokinase-type plasminogen activator. |
| title_short | The crystal structure of the catalytic domain of human urokinase-type plasminogen activator. |
| title_sort | crystal structure of the catalytic domain of human urokinase type plasminogen activator |
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