4IAF

Room temperature X-ray Structure OF cAMP dependent protein kinase A in complex with high Mg2+ concentration, ADP and phosphorylated peptide pSP20

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.160 

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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 ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
cAMP-dependent protein kinase catalytic subunit alphaA356Mus musculusMutation(s): 0 
Gene Names: Prkaca, Pkaca
EC: 2.7.11.11
UniProt
Find proteins for P05132 (Mus musculus)
Explore P05132 
Go to UniProtKB:  P05132
Entity Groups  
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UniProt GroupP05132
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
phosphorylated pseudo-substrate peptide pSP20B [auth S]20Homo sapiensMutation(s): 0 
Gene Names: PKIA, PRKACN1
UniProt & NIH Common Fund Data Resources
Find proteins for P61925 (Homo sapiens)
Explore P61925 
Go to UniProtKB:  P61925
PHAROS:  P61925
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61925
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP
Download Ideal Coordinates CCD File 
E [auth A]ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D 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: 2.20 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.160 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.213α = 90
b = 79.901β = 90
c = 99.637γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
CNSrefinement
HKL-3000data reduction
HKL-3000data scaling
CNSphasing

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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