4X6Q

An Isoform-specific Myristylation Switch Targets RIIb PKA Holoenzymes to Membranes


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

An Isoform-Specific Myristylation Switch Targets Type II PKA Holoenzymes to Membranes.

Zhang, P.Ye, F.Bastidas, A.C.Kornev, A.P.Wu, J.Ginsberg, M.H.Taylor, S.S.

(2015) Structure 23: 1563-1572

  • DOI: 10.1016/j.str.2015.07.007
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cyclic AMP-dependent protein kinase (PKA) is regulated in part by N-terminal myristylation of its catalytic (C) subunit. Structural information about the role of myristylation in membrane targeting of PKA has been limited. In mammalian cells there ar ...

    Cyclic AMP-dependent protein kinase (PKA) is regulated in part by N-terminal myristylation of its catalytic (C) subunit. Structural information about the role of myristylation in membrane targeting of PKA has been limited. In mammalian cells there are four functionally non-redundant PKA regulatory subunits (RIα, RIβ, RIIα, and RIIβ). PKA is assembled as an inactive R2C2 holoenzyme in cells. To explore the role of N-myristylation in membrane targeting of PKA holoenzymes, we solved crystal structures of RIα:myrC and RIIβ2:myrC2, and showed that the N-terminal myristylation site in the myrC serves as a flexible "switch" that can potentially be mobilized for membrane anchoring of RII, but not RI, holoenzymes. Furthermore, we synthesized nanodiscs and showed by electron microscopy that membrane targeting through the myristic acid is specific for the RII holoenzyme. This membrane-anchoring myristylation switch is independent of A Kinase Anchoring Proteins (AKAPs) that target PKA to membranes by other mechanisms.


    Organizational Affiliation

    Department of Pharmacology, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0654, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
cAMP-dependent protein kinase type II-beta regulatory subunit
B
416Mus musculusMutation(s): 0 
Gene Names: Prkar2b
Find proteins for P31324 (Mus musculus)
Go to UniProtKB:  P31324
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
cAMP-dependent protein kinase catalytic subunit alpha
C
350Mus musculusMutation(s): 0 
Gene Names: Prkaca (Pkaca)
EC: 2.7.11.11
Find proteins for P05132 (Mus musculus)
Go to UniProtKB:  P05132
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
C
L-PEPTIDE LINKINGC3 H8 N O6 PSER
TPO
Query on TPO
C
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.198 
  • Space Group: C 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 152.714α = 90.00
b = 214.039β = 90.00
c = 61.872γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
SCALEPACKdata scaling
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM034921

Revision History 

  • Version 1.0: 2015-07-22
    Type: Initial release
  • Version 1.1: 2015-08-26
    Type: Experimental preparation
  • Version 1.2: 2015-09-02
    Type: Database references
  • Version 1.3: 2015-09-16
    Type: Database references
  • Version 1.4: 2017-09-20
    Type: Author supporting evidence, Database references, Derived calculations, Refinement description