2cn5: Difference between revisions
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|PDB= 2cn5 |SIZE=350|CAPTION= <scene name='initialview01'>2cn5</scene>, resolution 2.25Å | |PDB= 2cn5 |SIZE=350|CAPTION= <scene name='initialview01'>2cn5</scene>, resolution 2.25Å | ||
|SITE= <scene name='pdbsite=AC1:Adp+Binding+Site+For+Chain+A'>AC1</scene> | |SITE= <scene name='pdbsite=AC1:Adp+Binding+Site+For+Chain+A'>AC1</scene> | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=ADP:ADENOSINE-5'-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NO3:NITRATE+ION'>NO3</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/Non-specific_serine/threonine_protein_kinase Non-specific serine/threonine protein kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.11.1 2.7.11.1] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Non-specific_serine/threonine_protein_kinase Non-specific serine/threonine protein kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.11.1 2.7.11.1] </span> | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY= | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2cn5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2cn5 OCA], [http://www.ebi.ac.uk/pdbsum/2cn5 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2cn5 RCSB]</span> | |||
}} | }} | ||
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==Overview== | ==Overview== | ||
The protein kinase Chk2 (checkpoint kinase 2) is a major effector of the replication checkpoint. Chk2 activation is initiated by phosphorylation of Thr68, in the serine-glutamine/threonine-glutamine cluster domain (SCD), by ATM. The phosphorylated SCD-segment binds to the FHA domain of a second Chk2 molecule, promoting dimerisation of the protein and triggering phosphorylation of the activation segment/T-loop in the kinase domain. We have now determined the structure of the kinase domain of human Chk2 in complexes with ADP and a small-molecule inhibitor debromohymenialdisine. The structure reveals a remarkable dimeric arrangement in which T-loops are exchanged between protomers, to form an active kinase conformation in trans. Biochemical data suggest that this dimer is the biologically active state promoted by ATM-phosphorylation, and also suggests a mechanism for dimerisation-driven activation of Chk2 by trans-phosphorylation. | The protein kinase Chk2 (checkpoint kinase 2) is a major effector of the replication checkpoint. Chk2 activation is initiated by phosphorylation of Thr68, in the serine-glutamine/threonine-glutamine cluster domain (SCD), by ATM. The phosphorylated SCD-segment binds to the FHA domain of a second Chk2 molecule, promoting dimerisation of the protein and triggering phosphorylation of the activation segment/T-loop in the kinase domain. We have now determined the structure of the kinase domain of human Chk2 in complexes with ADP and a small-molecule inhibitor debromohymenialdisine. The structure reveals a remarkable dimeric arrangement in which T-loops are exchanged between protomers, to form an active kinase conformation in trans. Biochemical data suggest that this dimer is the biologically active state promoted by ATM-phosphorylation, and also suggests a mechanism for dimerisation-driven activation of Chk2 by trans-phosphorylation. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Oliver, A W.]] | [[Category: Oliver, A W.]] | ||
[[Category: Pearl, L H.]] | [[Category: Pearl, L H.]] | ||
[[Category: activation segment]] | [[Category: activation segment]] | ||
[[Category: alternative splicing]] | [[Category: alternative splicing]] | ||
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[[Category: tumour suppressor]] | [[Category: tumour suppressor]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 02:23:52 2008'' | ||
