1ol5
From Proteopedia
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==Overview== | ==Overview== | ||
| - | Aurora-A is an oncogenic kinase essential for mitotic spindle assembly. It, is activated by phosphorylation and by the microtubule-associated protein, TPX2, which also localizes the kinase to spindle microtubules. We have, uncovered the molecular mechanism of Aurora-A activation by determining, crystal structures of its phosphorylated form both with and without a 43, residue long domain of TPX2 that we identified as fully functional for, kinase activation and protection from dephosphorylation. In the absence of, TPX2, the Aurora-A activation segment is in an inactive conformation, with, the crucial phosphothreonine exposed and accessible for deactivation., Binding of TPX2 triggers no global conformational changes in the kinase, but pulls on the activation segment, swinging the .. | + | Aurora-A is an oncogenic kinase essential for mitotic spindle assembly. It, is activated by phosphorylation and by the microtubule-associated protein, TPX2, which also localizes the kinase to spindle microtubules. We have, uncovered the molecular mechanism of Aurora-A activation by determining, crystal structures of its phosphorylated form both with and without a 43, residue long domain of TPX2 that we identified as fully functional for, kinase activation and protection from dephosphorylation. In the absence of, TPX2, the Aurora-A activation segment is in an inactive conformation, with, the crucial phosphothreonine exposed and accessible for deactivation., Binding of TPX2 triggers no global conformational changes in the kinase, but pulls on the activation segment, swinging the phosphothreonine into a, buried position and locking the active conformation. The recognition, between Aurora-A and TPX2 resembles that between the cAPK catalytic core, and its flanking regions, suggesting this molecular mechanism may be a, recurring theme in kinase regulation. |
==About this Structure== | ==About this Structure== | ||
| - | 1OL5 is a | + | 1OL5 is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with MG, SO4 and ADP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Transferred_entry:_2.7.11.1 Transferred entry: 2.7.11.1], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.37 2.7.1.37] Structure known Active Site: AC3. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1OL5 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
| - | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 13:08:43 2007'' |
Revision as of 11:03, 5 November 2007
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STRUCTURE OF AURORA-A 122-403, PHOSPHORYLATED ON THR287, THR288 AND BOUND TO TPX2 1-43
Overview
Aurora-A is an oncogenic kinase essential for mitotic spindle assembly. It, is activated by phosphorylation and by the microtubule-associated protein, TPX2, which also localizes the kinase to spindle microtubules. We have, uncovered the molecular mechanism of Aurora-A activation by determining, crystal structures of its phosphorylated form both with and without a 43, residue long domain of TPX2 that we identified as fully functional for, kinase activation and protection from dephosphorylation. In the absence of, TPX2, the Aurora-A activation segment is in an inactive conformation, with, the crucial phosphothreonine exposed and accessible for deactivation., Binding of TPX2 triggers no global conformational changes in the kinase, but pulls on the activation segment, swinging the phosphothreonine into a, buried position and locking the active conformation. The recognition, between Aurora-A and TPX2 resembles that between the cAPK catalytic core, and its flanking regions, suggesting this molecular mechanism may be a, recurring theme in kinase regulation.
About this Structure
1OL5 is a Protein complex structure of sequences from Homo sapiens with MG, SO4 and ADP as ligands. Active as Transferred entry: 2.7.11.1, with EC number 2.7.1.37 Structure known Active Site: AC3. Full crystallographic information is available from OCA.
Reference
Structural basis of Aurora-A activation by TPX2 at the mitotic spindle., Bayliss R, Sardon T, Vernos I, Conti E, Mol Cell. 2003 Oct;12(4):851-62. PMID:14580337
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