4O22

Binary complex of metal-free PKAc with SP20.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Metal-Free cAMP-Dependent Protein Kinase Can Catalyze Phosphoryl Transfer.

Gerlits, O.Das, A.Keshwani, M.M.Taylor, S.Waltman, M.J.Langan, P.Heller, W.T.Kovalevsky, A.

(2014) Biochemistry 53: 3179-3186

  • DOI: 10.1021/bi5000965
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • X-ray structures of several ternary product complexes of the catalytic subunit of cAMP-dependent protein kinase (PKAc) have been determined with no bound metal ions and with Na(+) or K(+) coordinated at two metal-binding sites. The metal-free PKAc an ...

    X-ray structures of several ternary product complexes of the catalytic subunit of cAMP-dependent protein kinase (PKAc) have been determined with no bound metal ions and with Na(+) or K(+) coordinated at two metal-binding sites. The metal-free PKAc and the enzyme with alkali metals were able to facilitate the phosphoryl transfer reaction. In all studied complexes, the ATP and the substrate peptide (SP20) were modified into the products ADP and the phosphorylated peptide. The products of the phosphotransfer reaction were also found when ATP-γS, a nonhydrolyzable ATP analogue, reacted with SP20 in the PKAc active site containing no metals. Single turnover enzyme kinetics measurements utilizing (32)P-labeled ATP confirmed the phosphotransferase activity of the enzyme in the absence of metal ions and in the presence of alkali metals. In addition, the structure of the apo-PKAc binary complex with SP20 suggests that the sequence of binding events may become ordered in a metal-free environment, with SP20 binding first to prime the enzyme for subsequent ATP binding. Comparison of these structures reveals conformational and hydrogen bonding changes that might be important for the mechanism of catalysis.


    Organizational Affiliation

    Biology and Soft Matter Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
cAMP-dependent protein kinase catalytic subunit alpha.
A
342Mus musculusMutation(s): 0 
Gene Names: Prkaca (Pkaca)
EC: 2.7.11.11
Find proteins for P05132 (Mus musculus)
Go to UniProtKB:  P05132
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Phosphorylated peptide pSP20.
S
20Homo sapiensMutation(s): 2 
Gene Names: PKIA (PRKACN1)
Find proteins for P61925 (Homo sapiens)
Go to Gene View: PKIA
Go to UniProtKB:  P61925
Small Molecules
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: 1.7 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 56.630α = 90.00
b = 97.860β = 90.00
c = 78.620γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHENIXphasing
PHENIXrefinement
XSCALEdata scaling
PHENIXmodel building
ADSCdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-05-28
    Type: Initial release