Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 33139.05 
• Atom Count: 2189 
• Residue Count: 289 
• Unique protein chains: 1

1IA8

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

• DOI: 10.2210/pdb1IA8/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda


• Deposited: 2001-03-22 Released: 2001-04-18 
• Deposition Author(s): Chen, P., Luo, C., Deng, Y., Ryan, K., Register, J., Margosiak, S., Tempczyk-Russell, A., Nguyen, B., Myers, P., Lundgren, K., Chen Kan, C.-C., O'Connor, P.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.7 Å
• R-Value Free: 0.235 
• R-Value Work: 0.216 

Literature

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.

(2000) Cell 100: 681-692

• PubMed: 10761933 


• PubMed Abstract: 
  

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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Organizational Affiliation: 

Agouron Pharmaceuticals, Inc. San Diego, California 92121, USA. [e-mail]

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
CHK1 CHECKPOINT KINASE	A	289	Homo sapiens	Mutation(s): 0  Gene Names: CHEK1 (CHK1) EC: 2.7.11.1
Find proteins for O14757 (Homo sapiens) Go to Gene View: CHEK1 Go to UniProtKB:  O14757

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.7 Å
• R-Value Free: 0.235 
• R-Value Work: 0.216 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 45.200	α = 90.00
b = 65.700	β = 93.90
c = 58.100	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
PHASES	phasing
AMoRE	phasing
DENZO	data reduction
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-03-22 
• Released Date: 2001-04-18 
• Deposition Author(s): Chen, P., Luo, C., Deng, Y., Ryan, K., Register, J., Margosiak, S., Tempczyk-Russell, A., Nguyen, B., Myers, P., Lundgren, K., Chen Kan, C.-C., O'Connor, P.M.

Revision History 

• Version 1.0: 2001-04-18
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 1.3: 2018-01-31
  Type: Experimental preparation