4DH8

Room temperature X-ray structure of cAMP dependent Protein Kinase A catalytic subunit with high Mg2+, AMP-PNP and IP20


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.155 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Low- and room-temperature X-ray structures of protein kinase A ternary complexes shed new light on its activity.

Kovalevsky, A.Y.Johnson, H.Hanson, B.L.Waltman, M.J.Fisher, S.Z.Taylor, S.Langan, P.

(2012) Acta Crystallogr D Biol Crystallogr 68: 854-860

  • DOI: https://doi.org/10.1107/S0907444912014886
  • Primary Citation of Related Structures:  
    4DH1, 4DH3, 4DH5, 4DH7, 4DH8

  • PubMed Abstract: 

    Post-translational protein phosphorylation by protein kinase A (PKA) is a ubiquitous signalling mechanism which regulates many cellular processes. A low-temperature X-ray structure of the ternary complex of the PKA catalytic subunit (PKAc) with ATP and a 20-residue peptidic inhibitor (IP20) at the physiological Mg(2+) concentration of ∼0.5 mM (LT PKA-MgATP-IP20) revealed a single metal ion in the active site. The lack of a second metal in LT PKA-MgATP-IP20 renders the β- and γ-phosphoryl groups of ATP very flexible, with high thermal B factors. Thus, the second metal is crucial for tight positioning of the terminal phosphoryl group for transfer to a substrate, as demonstrated by comparison of the former structure with that of the LT PKA-Mg(2)ATP-IP20 complex obtained at high Mg(2+) concentration. In addition to its kinase activity, PKAc is also able to slowly catalyze the hydrolysis of ATP using a water molecule as a substrate. It was found that ATP can be readily and completely hydrolyzed to ADP and a free phosphate ion in the crystals of the ternary complex PKA-Mg(2)ATP-IP20 by X-ray irradiation at room temperature. The cleavage of ATP may be aided by X-ray-generated free hydroxyl radicals, a very reactive chemical species, which move rapidly through the crystal at room temperature. The phosphate anion is clearly visible in the electron-density maps; it remains in the active site but slides about 2 Å from its position in ATP towards Ala21 of IP20, which mimics the phosphorylation site. The phosphate thus pushes the peptidic inhibitor away from the product ADP, while resulting in dramatic conformational changes of the terminal residues 24 and 25 of IP20. X-ray structures of PKAc in complex with the nonhydrolysable ATP analogue AMP-PNP at both room and low temperature demonstrated no temperature effects on the conformation and position of IP20.


  • Organizational Affiliation

    Bioscience Division, Los Alamos National Laboratory, PO Box 1663, MS M888, Los Alamos, NM 87545, USA. ayk@lanl.gov


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cAMP-dependent protein kinase catalytic subunit alpha350Mus musculusMutation(s): 0 
Gene Names: PrkacaPkaca
EC: 2.7.11.11
UniProt
Find proteins for P05132 (Mus musculus)
Explore P05132 
Go to UniProtKB:  P05132
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05132
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
cAMP-dependent protein kinase inhibitor alphaB [auth I]20Mus musculusMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P63248 (Mus musculus)
Explore P63248 
Go to UniProtKB:  P63248
IMPC:  MGI:104747
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63248
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  2 Unique
IDChains TypeFormula2D DiagramParent
SEP
Query on SEP
A
L-PEPTIDE LINKINGC3 H8 N O6 PSER
TPO
Query on TPO
A
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.155 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.211α = 90
b = 80.031β = 90
c = 99.202γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
CNSrefinement
HKL-3000data reduction
HKL-3000data scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-06-27
    Type: Initial release
  • Version 1.1: 2012-12-12
    Changes: Other
  • Version 1.2: 2013-01-23
    Changes: Database references
  • Version 1.3: 2013-03-13
    Changes: Other