3QHR

Structure of a pCDK2/CyclinA transition-state mimic

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 

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Literature

Briefly Bound to Activate: Transient Binding of a Second Catalytic Magnesium Activates the Structure and Dynamics of CDK2 Kinase for Catalysis.

Bao, Z.Q., Jacobsen, D.M., Young, M.A.

(2011) Structure 19: 675-690

  • DOI: 10.1016/j.str.2011.02.016
  • Primary Citation of Related Structures:  
    3QHR, 3QHW

  • PubMed Abstract: 

    • We have determined high-resolution crystal structures of a CDK2/Cyclin A transition state complex bound to ADP, substrate peptide, and MgF(3)(-). Compared to previous structures of active CDK2, the catalytic subunit of the kinase adopts a more closed conformation around the active site and now allows observation of a second Mg(2+) ion in the active site ...

    We have determined high-resolution crystal structures of a CDK2/Cyclin A transition state complex bound to ADP, substrate peptide, and MgF(3)(-). Compared to previous structures of active CDK2, the catalytic subunit of the kinase adopts a more closed conformation around the active site and now allows observation of a second Mg(2+) ion in the active site. Coupled with a strong [Mg(2+)] effect on in vitro kinase activity, the structures suggest that the transient binding of the second Mg(2+) ion is necessary to achieve maximum rate enhancement of the chemical reaction, and Mg(2+) concentration could represent an important regulator of CDK2 activity in vivo. Molecular dynamics simulations illustrate how the simultaneous binding of substrate peptide, ATP, and two Mg(2+) ions is able to induce a more rigid and closed organization of the active site that functions to orient the phosphates, stabilize the buildup of negative charge, and shield the subsequently activated γ-phosphate from solvent.

    Organizational Affiliation: 

    Department of Biological Chemistry and the Bioinformatics Program, The University of Michigan Medical School, Ann Arbor, MI 48109, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cell division protein kinase 2A, C298Homo sapiensMutation(s): 0 
Gene Names: CDK2, CDKN2
EC: 2.7.11.22
UniProt & NIH Common Fund Data Resources
Find proteins for P24941 (Homo sapiens)
Explore P24941 
Go to UniProtKB:  P24941
PHAROS:  P24941
GTEx:  ENSG00000123374 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP24941
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Cyclin-A2B, D261Mus musculusMutation(s): 0 
Gene Names: Ccna2, Ccna, Cyca, Cyca2
UniProt
Find proteins for P51943 (Mus musculus)
Explore P51943 
Go to UniProtKB:  P51943
Entity Groups  
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UniProt GroupP51943
Protein Feature View
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  • Reference Sequence

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
CDK2 substrate peptide: PKTPKKAKKLE [auth J],
F [auth K],
G [auth L],
H [auth M]		10N/AMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP
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I [auth A],
W [auth C]		ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N		 Ligand Interaction
GOL
Query on GOL
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BA [auth C],
CA [auth C],
DA [auth D],
EA [auth D],
FA [auth D],
BA [auth C],
CA [auth C],
DA [auth D],
EA [auth D],
FA [auth D],
GA [auth D],
HA [auth D],
IA [auth K],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth B],
S [auth B],
T [auth B],
U [auth B],
V [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
MGF
Query on MGF
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L [auth A],
Z [auth C]		TRIFLUOROMAGNESATE
F3 Mg
GJOMWUHGUQLOAC-UHFFFAOYSA-K		 Ligand Interaction
CL
Query on CL
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AA [auth C],
M [auth A]		CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
J [auth A],
K [auth A],
X [auth C],
Y [auth C]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO		A, C L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.69α = 90
b = 163.91β = 107.38
c = 73.28γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
MAR345dtbdata collection

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-05-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance