6M8S

Crystal structure of the KCTD12 H1 domain in complex with Gbeta1gamma2 subunits


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.71 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.253 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for KCTD-mediated rapid desensitization of GABABsignalling.

Zheng, S.Abreu, N.Levitz, J.Kruse, A.C.

(2019) Nature 567: 127-131

  • DOI: 10.1038/s41586-019-0990-0
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The GABA B (γ-aminobutyric acid type B) receptor is one of the principal inhibitory neurotransmitter receptors in the brain, and it signals through heterotrimeric G proteins to activate a variety of effectors, including G-protein-coupled ...

    The GABA B (γ-aminobutyric acid type B) receptor is one of the principal inhibitory neurotransmitter receptors in the brain, and it signals through heterotrimeric G proteins to activate a variety of effectors, including G-protein-coupled inwardly rectifying potassium channels (GIRKs) 1,2 . GABA B -receptor signalling is tightly regulated by auxiliary subunits called KCTDs, which control the kinetics of GIRK activation and desensitization 3-5 . However, the mechanistic basis for KCTD modulation of GABA B signalling remains incompletely understood. Here, using a combination of X-ray crystallography, electron microscopy, and functional and biochemical experiments, we reveal the molecular details of KCTD binding to both GABA B receptors and G-protein βγ subunits. KCTDs associate with the receptor by forming an asymmetric pentameric ring around a region of the receptor carboxy-terminal tail, while a second KCTD domain, H1, engages in a symmetric interaction with five copies of Gβγ in which the G-protein subunits also interact directly with one another. We further show that KCTD binding to Gβγ is highly cooperative, defining a model in which KCTD proteins cooperatively strip G proteins from GIRK channels to induce rapid desensitization following receptor activation. These results provide a framework for understanding the molecular basis for the precise temporal control of GABA B signalling by KCTD proteins.


    Organizational Affiliation

    Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA, USA. andrew_kruse@hms.harvard.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
C, D, G, H, K
350Homo sapiensMutation(s): 0 
Gene Names: GNB1
Find proteins for P62873 (Homo sapiens)
Go to UniProtKB:  P62873
NIH Common Fund Data Resources
PHAROS  P62873

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
BTB/POZ domain-containing protein KCTD12
A, B, M, O, P
129Homo sapiensMutation(s): 0 
Gene Names: KCTD12C13orf2KIAA1778PFET1
Find proteins for Q96CX2 (Homo sapiens)
Go to UniProtKB:  Q96CX2
NIH Common Fund Data Resources
PHAROS  Q96CX2

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
E, F, I, J, L
71Homo sapiensMutation(s): 0 
Gene Names: GNG2
Find proteins for P59768 (Homo sapiens)
Go to UniProtKB:  P59768
NIH Common Fund Data Resources
PHAROS  P59768
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.71 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.253 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.09α = 90
b = 121.99β = 90
c = 206.43γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-08-22 
  • Released Date: 2019-02-27 
  • Deposition Author(s): Zheng, S., Kruse, A.C.

Funding OrganizationLocationGrant Number
Other privateUnited StatesKlingenstein-Simons Fellowship Program

Revision History 

  • Version 1.0: 2019-02-27
    Type: Initial release
  • Version 1.1: 2019-03-13
    Changes: Data collection, Database references