4QJ4

Structure of a fragment of human phospholipase C-beta3 delta472-569, bound to IP3 and in complex with Galphaq


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Molecular mechanisms of phospholipase C beta 3 autoinhibition.

Lyon, A.M.Begley, J.A.Manett, T.D.Tesmer, J.J.

(2014) Structure 22: 1844-1854

  • DOI: 10.1016/j.str.2014.10.008
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Phospholipase C β (PLCβ) enzymes are dramatically activated by heterotrimeric G proteins. Central to this response is the robust autoinhibition of PLCβ by the X-Y linker region within its catalytic core and by the Hα2' helix in the C-terminal extensi ...

    Phospholipase C β (PLCβ) enzymes are dramatically activated by heterotrimeric G proteins. Central to this response is the robust autoinhibition of PLCβ by the X-Y linker region within its catalytic core and by the Hα2' helix in the C-terminal extension of the enzyme. The molecular mechanism of each and their mutual dependence are poorly understood. Herein, it is shown that distinct regions within the X-Y linker have specific roles in regulating activity. Most important,an acidic stretch within the linker stabilizes a lid that occludes the active site, consistent with crystal structures of variants lacking this region. Inhibition by the Hα2' helix is independent of the X-Y linker and likely regulates activity by limiting membrane interaction of the catalytic core. Full activation of PLCβ thus requires multiple independent molecular events induced by membrane association of the catalytic core and by the binding of regulatory proteins.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Guanine nucleotide-binding protein G(q) subunit alpha
A
379Mus musculusMutation(s): 0 
Gene Names: Gnaq
Find proteins for P21279 (Mus musculus)
Go to UniProtKB:  P21279
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase beta-3
B
793Homo sapiensMutation(s): 0 
Gene Names: PLCB3
EC: 3.1.4.11
Find proteins for Q01970 (Homo sapiens)
Go to Gene View: PLCB3
Go to UniProtKB:  Q01970
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

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A
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
CA
Query on CA

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Download CCD File 
B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
ALF
Query on ALF

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Download CCD File 
A
TETRAFLUOROALUMINATE ION
Al F4
UYOMQIYKOOHAMK-UHFFFAOYSA-J
 Ligand Interaction
MG
Query on MG

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A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
I3P
Query on I3P

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Download CCD File 
B
D-MYO-INOSITOL-1,4,5-TRIPHOSPHATE
C6 H15 O15 P3
MMWCIQZXVOZEGG-XJTPDSDZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.208 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 201.923α = 90.00
b = 89.191β = 101.70
c = 92.639γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
REFMACrefinement
DENZOdata reduction
REFMACphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-22
    Type: Initial release
  • Version 1.1: 2014-12-24
    Type: Database references
  • Version 1.2: 2015-02-11
    Type: Database references
  • Version 1.3: 2017-08-02
    Type: Data collection, Refinement description, Source and taxonomy