1bx7
From Proteopedia
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| - | [[Image:1bx7.jpg|left|200px]] | + | [[Image:1bx7.jpg|left|200px]] |
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| - | '''HIRUSTASIN FROM HIRUDO MEDICINALIS AT 1.2 ANGSTROMS''' | + | {{Structure |
| + | |PDB= 1bx7 |SIZE=350|CAPTION= <scene name='initialview01'>1bx7</scene>, resolution 1.20Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=SO4:SULFATE ION'>SO4</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''HIRUSTASIN FROM HIRUDO MEDICINALIS AT 1.2 ANGSTROMS''' | ||
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==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1BX7 is a [ | + | 1BX7 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Hirudo_medicinalis Hirudo medicinalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BX7 OCA]. |
==Reference== | ==Reference== | ||
| - | The 1.2 A crystal structure of hirustasin reveals the intrinsic flexibility of a family of highly disulphide-bridged inhibitors., Uson I, Sheldrick GM, de La Fortelle E, Bricogne G, Di Marco S, Priestle JP, Grutter MG, Mittl PR, Structure. 1999 Jan 15;7(1):55-63. PMID:[http:// | + | The 1.2 A crystal structure of hirustasin reveals the intrinsic flexibility of a family of highly disulphide-bridged inhibitors., Uson I, Sheldrick GM, de La Fortelle E, Bricogne G, Di Marco S, Priestle JP, Grutter MG, Mittl PR, Structure. 1999 Jan 15;7(1):55-63. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10368273 10368273] |
[[Category: Hirudo medicinalis]] | [[Category: Hirudo medicinalis]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: anti-coagulant]] | [[Category: anti-coagulant]] | ||
[[Category: conformational flexibility]] | [[Category: conformational flexibility]] | ||
| - | [[Category: peptidic | + | [[Category: peptidic inhibitor]] |
[[Category: serine protease inhibitor]] | [[Category: serine protease inhibitor]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:16:58 2008'' |
Revision as of 08:17, 20 March 2008
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| , resolution 1.20Å | |||||||
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| Coordinates: | save as pdb, mmCIF, xml | ||||||
HIRUSTASIN FROM HIRUDO MEDICINALIS AT 1.2 ANGSTROMS
Overview
BACKGROUND: Leech-derived inhibitors have a prominent role in the development of new antithrombotic drugs, because some of them are able to block the blood coagulation cascade. Hirustasin, a serine protease inhibitor from the leech Hirudo medicinalis, binds specifically to tissue kallikrein and possesses structural similarity with antistasin, a potent factor Xa inhibitor from Haementeria officinalis. Although the 2.4 A structure of the hirustasin-kallikrein complex is known, classical methods such as molecular replacement were not successful in solving the structure of free hirustasin. RESULTS: Ab initio real/reciprocal space iteration has been used to solve the structure of free hirustasin using either 1.4 A room temperature data or 1.2 A low temperature diffraction data. The structure was also solved independently from a single pseudo-symmetric gold derivative using maximum likelihood methods. A comparison of the free and complexed structures reveals that binding to kallikrein causes a hinge-bending motion between the two hirustasin subdomains. This movement is accompanied by the isomerisation of a cis proline to the trans conformation and a movement of the P3, P4 and P5 residues so that they can interact with the cognate protease. CONCLUSIONS: The inhibitors from this protein family are fairly flexible despite being highly cross-linked by disulphide bridges. This intrinsic flexibility is necessary to adopt a conformation that is recognised by the protease and to achieve an optimal fit, such observations illustrate the pitfalls of designing inhibitors based on static lock-and-key models. This work illustrates the potential of new methods of structure solution that require less or even no prior phase information.
About this Structure
1BX7 is a Single protein structure of sequence from Hirudo medicinalis. Full crystallographic information is available from OCA.
Reference
The 1.2 A crystal structure of hirustasin reveals the intrinsic flexibility of a family of highly disulphide-bridged inhibitors., Uson I, Sheldrick GM, de La Fortelle E, Bricogne G, Di Marco S, Priestle JP, Grutter MG, Mittl PR, Structure. 1999 Jan 15;7(1):55-63. PMID:10368273
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