4DG0

Crystal structure of myristoylated WT catalytic subunit of cAMP-dependent protein kinase in complex with SP20 and AMP-PNP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 

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This is version 1.1 of the entry. See complete history


Literature

Role of N-terminal myristylation in the structure and regulation of cAMP-dependent protein kinase.

Bastidas, A.C.Deal, M.S.Steichen, J.M.Keshwani, M.M.Guo, Y.Taylor, S.S.

(2012) J Mol Biol 422: 215-229

  • DOI: https://doi.org/10.1016/j.jmb.2012.05.021
  • Primary Citation of Related Structures:  
    4DFX, 4DFZ, 4DG0, 4DG2

  • PubMed Abstract: 

    The catalytic (C) subunit of cAMP-dependent protein kinase [protein kinase A (PKA)] is a major target of cAMP signaling, and its regulation is of fundamental importance to biological processes. One mode of regulation is N-myristylation, which has eluded structural and functional characterization so far because most crystal structures are of the non-myristylated enzyme, are phosphorylated on Ser10, and generally lack electron density for the first 13 residues. We crystallized myristylated wild-type (WT) PKA and a K7C mutant as binary (bound to a substrate peptide) and ternary [bound to a substrate peptide and adenosine-5'-(β,γ-imido)triphosphate] complexes. There was clear electron density for the entire N-terminus in the binary complexes, both refined to 2.0 Å, and K7C ternary complex, refined to 1.35 Å. The N-termini in these three structures display a novel conformation with a previously unseen helix from residues 1 to 7. The K7C mutant appears to have a more stable N-terminus, and this correlated with a significant decrease in the B-factors for the N-terminus in the myr-K7C complexes compared to the WT binary complex. The N-terminus of the myristylated WT ternary complex, refined to 2.0 Å, was disordered as in previous structures. In addition to a more ordered N-terminus, the myristylated K7C mutant exhibited a 53% increase in k(cat). The effect of nucleotide binding on the structure of the N-terminus in the WT protein and the kinetic changes in the K7C protein suggest that myristylation or occupancy of the myristyl binding pocket may serve as a site for allosteric regulation in the C-subunit.


  • Organizational Affiliation

    Department of Pharmacology, University of California San Diego, San Diego, CA 92093, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cAMP-dependent protein kinase catalytic subunit alphaA [auth E]350Mus 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  
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UniProt GroupP05132
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
cAMP-dependent protein kinase inhibitor alphaB [auth I]20Mus musculusMutation(s): 2 
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
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.8α = 90
b = 78.73β = 90
c = 99γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-06-06
    Type: Initial release
  • Version 1.1: 2013-01-02
    Changes: Database references