ISDA

Deposition Date 2001-03-22

Release Date 2001-04-18

Last Version Date 2024-04-03

Entry Detail

PDB ID:

1IA8

Keywords:

TRANSFERASE

Title:

THE 1.7 A CRYSTAL STRUCTURE OF HUMAN CELL CYCLE CHECKPOINT KINASE CHK1

Biological Source:

Source Organism:

Homo sapiens (Taxon ID: 9606)

Host Organism:

Spodoptera frugiperda

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.70 Å

R-Value Free:

0.23

R-Value Work:

0.21

Space Group:

P 1 21 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:CHK1 CHECKPOINT KINASE
Gene (Uniprot):CHEK1
Chain IDs:A
Chain Length:289
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:O14757 Pfam ID:PF00069 EC:2.7.11.1

Ligand Molecules

SO4

Primary Citation

The 1.7 A crystal structure of human cell cycle checkpoint kinase Chk1: implications for Chk1 regulation.

Chen, P, Luo, C, Deng, Y, Ryan, K, Register, J, Margosiak, S, Tempczyk-Russell, A, Nguyen, B, Myers, P, Lundgren, K, Kan, C.C, O'Connor, P.M.Show

Cell(Cambridge,Mass.) 100 681 692 (2000)

PMID: 10761933 DOI: 10.1016/S0092-8674(00)80704-7

Abstact

The checkpoint kinase Chk1 is an important mediator of cell cycle arrest following DNA damage. The 1.7 A resolution crystal structures of the human Chk1 kinase domain and its binary complex with an ATP analog has revealed an identical open kinase conformation. The secondary structure and side chain interactions stabilize the activation loop of Chk1 and enable kinase activity without phosphorylation of the catalytic domain. Molecular modeling of the interaction of a Cdc25C peptide with Chk1 has uncovered several conserved residues that are important for substrate selectivity. In addition, we found that the less conserved C-terminal region negatively impacts Chk1 kinase activity.

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Primary Citation of related structures