1OL6

Structure of unphosphorylated D274N mutant of Aurora-A

Summary for 1OL6

• Entry DOI: 10.2210/pdb1ol6/pdb
• Related: 1MUO 1OL5 1OL7
• Descriptor: SERINE/THREONINE KINASE 6, ADENOSINE-5'-TRIPHOSPHATE (3 entities in total)
• Functional Keywords: transferase, cell cycle, serine/threonine-protein kinase, atp-binding, phosphorylation
• Biological source: HOMO SAPIENS (HUMAN)
• Cellular location: Cytoplasm, cytoskeleton, microtubule organizing center, centrosome: O14965
• Total number of polymer chains: 1
• Total formula weight: 33195.65

Authors

Bayliss, R.,Conti, E. (deposition date: 2003-08-06, release date: 2003-10-30, Last modification date: 2023-12-13)

Primary citation

Bayliss, R.,Sardon, T.,Vernos, I.,Conti, E.
Structural Basis of Aurora-A Activation by Tpx2 at the Mitotic Spindle.
Mol.Cell, 12:851-, 2003

PubMed Abstract: 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.

PubMed: 14580337
DOI: 10.1016/S1097-2765(03)00392-7

Experimental method

X-RAY DIFFRACTION (3 Å)