4DFY

Crystal structure of R194A mutant of cAMP-dependent protein kinase with unphosphorylated activation loop


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.997 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.252 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for the regulation of protein kinase a by activation loop phosphorylation.

Steichen, J.M.Kuchinskas, M.Keshwani, M.M.Yang, J.Adams, J.A.Taylor, S.S.

(2012) J.Biol.Chem. 287: 14672-14680

  • DOI: 10.1074/jbc.M111.335091

  • PubMed Abstract: 
  • The catalytic subunit of cAMP-dependent protein kinase (PKA) is a member of the AGC group of protein kinases. Whereas PKA has served as a structural model for the protein kinase superfamily, all previous structures of the catalytic subunit contain a ...

    The catalytic subunit of cAMP-dependent protein kinase (PKA) is a member of the AGC group of protein kinases. Whereas PKA has served as a structural model for the protein kinase superfamily, all previous structures of the catalytic subunit contain a phosphorylated activation loop. To understand the structural effects of activation loop phosphorylation at Thr-197 we used a PKA mutant that does not autophosphorylate at Thr-197. The enzyme crystallized in the apo-state, and the structure was solved to 3.0 Å. The N-lobe is rotated by 18° relative to the wild-type apoenzyme, which illustrates that the enzyme likely exists in a wide range of conformations in solution due to the uncoupling of the N- and C-lobes. Several regions of the protein including the activation loop are disordered in the structure, and there are alternate main chain conformations for the magnesium positioning loop and catalytic loop causing a complete loss of hydrogen bonding between these two active site structural elements. These alterations are reflected in a 20-fold decrease in the apparent phosphoryl transfer rate as measured by pre-steady-state kinetic methods.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California 92093, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
cAMP-dependent protein kinase catalytic subunit alpha
A, E
371Mus musculusMutation(s): 1 
Gene Names: Prkaca (Pkaca)
EC: 2.7.11.11
Find proteins for P05132 (Mus musculus)
Go to UniProtKB:  P05132
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
A, E
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.997 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.252 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 95.745α = 90.00
b = 95.745β = 90.00
c = 173.959γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
ADSCdata collection
HKL-2000data reduction
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-15
    Type: Initial release
  • Version 1.1: 2012-02-29
    Type: Database references
  • Version 1.2: 2012-05-16
    Type: Database references