4IAC

X-RAY structure of cAMP dependent protein kinase A in complex with HIGH MG2+ concentration, AMP-PCP AND pseudo-substrate peptide SP20


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.181 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Insights into the Phosphoryl Transfer Catalyzed by cAMP-Dependent Protein Kinase: An X-ray Crystallographic Study of Complexes with Various Metals and Peptide Substrate SP20.

Gerlits, O.Waltman, M.J.Taylor, S.Langan, P.Kovalevsky, A.

(2013) Biochemistry 52: 3721-3727

  • DOI: https://doi.org/10.1021/bi400066a
  • Primary Citation of Related Structures:  
    4IAC, 4IAD, 4IAF, 4IAI, 4IAK, 4IAY, 4IAZ

  • PubMed Abstract: 

    X-ray structures of several ternary substrate and product complexes of the catalytic subunit of cAMP-dependent protein kinase (PKAc) have been determined with different bound metal ions. In the PKAc complexes, Mg(2+), Ca(2+), Sr(2+), and Ba(2+) metal ions could bind to the active site and facilitate the phosphoryl transfer reaction. ATP and a substrate peptide (SP20) were modified, and the reaction products ADP and the phosphorylated peptide were found trapped in the enzyme active site. Finally, we determined the structure of a pseudo-Michaelis complex containing Mg(2+), nonhydrolyzable AMP-PCP (β,γ-methyleneadenosine 5'-triphosphate) and SP20. The product structures together with the pseudo-Michaelis complex provide snapshots of different stages of the phosphorylation reaction. Comparison of these structures reveals conformational, coordination, and hydrogen bonding changes that might occur during the reaction and shed new light on its mechanism, roles of metals, and active site residues.


  • Organizational Affiliation

    Bioscience Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87544, United States.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cAMP-dependent protein kinase catalytic subunit alpha356Mus musculusMutation(s): 0 
Gene Names: PrkacaPkaca
EC: 2.7.11.11
UniProt
Find proteins for P05132 (Mus musculus)
Go to UniProtKB:  P05132
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Peptide SP20B [auth S]20Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P61925 (Homo sapiens)
Go to UniProtKB:  P61925
PHAROS:  P61925
GTEx:  ENSG00000171033 
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: 2.15 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.181 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.809α = 90
b = 79.678β = 90
c = 97.954γ = 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: 2013-06-12
    Type: Initial release
  • Version 1.1: 2013-12-18
    Changes: Database references
  • Version 1.2: 2016-09-21
    Changes: Structure summary
  • Version 1.3: 2024-10-16
    Changes: Data collection, Database references, Derived calculations, Structure summary