4X6R

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.7 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: https://doi.org/10.1016/j.str.2015.07.007
  • Primary Citation of Related Structures:  
    4X6Q, 4X6R

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cAMP-dependent protein kinase catalytic subunit alpha350Mus musculusMutation(s): 1 
Gene Names: PrkacaPkaca
EC: 2.7.11.11
UniProt
Find proteins for P05132 (Mus musculus)
Explore P05132 
Go to UniProtKB:  P05132
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05132
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
cAMP-dependent protein kinase type I-alpha regulatory subunit290Bos taurusMutation(s): 1 
Gene Names: PRKAR1A
UniProt
Find proteins for P00514 (Bos taurus)
Explore P00514 
Go to UniProtKB:  P00514
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00514
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
D [auth A]ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
MYR
Query on MYR

Download Ideal Coordinates CCD File 
G [auth A]MYRISTIC ACID
C14 H28 O2
TUNFSRHWOTWDNC-UHFFFAOYSA-N
TAM
Query on TAM

Download Ideal Coordinates CCD File 
E [auth A]TRIS(HYDROXYETHYL)AMINOMETHANE
C7 H17 N O3
GKODZWOPPOTFGA-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]
H [auth A]
K [auth B]
L [auth B]
M [auth B]
C [auth A],
H [auth A],
K [auth B],
L [auth B],
M [auth B],
N [auth B]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
GOL
Query on GOL

Download Ideal Coordinates CCD File 
F [auth A],
O [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
I [auth A],
J [auth A]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Modified Residues  2 Unique
IDChains TypeFormula2D 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: 2.40 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.76α = 90
b = 125.76β = 90
c = 140.881γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM034921

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-22
    Type: Initial release
  • Version 1.1: 2015-08-26
    Changes: Experimental preparation
  • Version 1.2: 2015-09-02
    Changes: Database references
  • Version 1.3: 2015-09-16
    Changes: Database references
  • Version 1.4: 2017-09-20
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.5: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.6: 2020-06-24
    Changes: Derived calculations
  • Version 1.7: 2024-11-20
    Changes: Data collection, Database references, Derived calculations, Structure summary