5TDH

The crystal structure of the dominant negative mutant G protein alpha(i)-1-beta-1-gamma-2 G203A/A326S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.276 
  • R-Value Observed: 0.278 

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Literature

The structural basis of the dominant negative phenotype of the G alpha i1 beta 1 gamma 2 G203A/A326S heterotrimer

Liu, P.Jia, M.-Z.Zhou, X.E.De Waal, P.W.Dickson, B.M.Liu, B.Hou, L.Yin, Y.-T.Kang, Y.-Y.Shi, Y.Melcher, K.Xu, H.E.Jiang, Y.

(2016) Acta Pharmacol Sin 37: 1259-1272

  • DOI: https://doi.org/10.1038/aps.2016.69
  • Primary Citation of Related Structures:  
    5TDH

  • PubMed Abstract: 

    Dominant negative mutant G proteins have provided critical insight into the mechanisms of G protein-coupled receptor (GPCR) signaling, but the mechanisms underlying the dominant negative characteristics are not completely understood. The aim of this study was to determine the structure of the dominant negative Gαi1β1γ2 G203A/A326S complex (Gi-DN) and to reveal the structural basis of the mutation-induced phenotype of Gαi1β1γ2. The three subunits of the Gi-DN complex were co-expressed with a baculovirus expression system. The Gi-DN heterotrimer was purified, and the structure of its complex with GDP was determined through X-ray crystallography. The Gi-DN heterotrimer structure revealed a dual mechanism underlying the dominant negative characteristics. The mutations weakened the hydrogen bonding network between GDP/GTP and the binding pocket residues, and increased the interactions in the Gα-Gβγ interface. Concomitantly, the Gi-DN heterotrimer adopted a conformation, in which the C-terminus of Gαi and the N-termini of both the Gβ and Gγ subunits were more similar to the GPCR-bound state compared with the wild type complex. From these structural observations, two additional mutations (T48F and D272F) were designed that completely abolish the GDP binding of the Gi-DN heterotrimer. Overall, the results suggest that the mutations impede guanine nucleotide binding and Gα-Gβγ protein dissociation and favor the formation of the G protein/GPCR complex, thus blocking signal propagation. In addition, the structure provides a rationale for the design of other mutations that cause dominant negative effects in the G protein, as exemplified by the T48F and D272F mutations.


  • Organizational Affiliation

    VARI-SIMM Center, Center for Structure and Function of Drug Targets, CAS-Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(i) subunit alpha-1A,
D [auth H]
354Homo sapiensMutation(s): 2 
Gene Names: GNAI1
UniProt & NIH Common Fund Data Resources
Find proteins for P63096 (Homo sapiens)
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Go to UniProtKB:  P63096
PHAROS:  P63096
GTEx:  ENSG00000127955 
Entity Groups  
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UniProt GroupP63096
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1B,
E [auth J]
342Rattus norvegicusMutation(s): 0 
Gene Names: Gnb1
UniProt
Find proteins for P54311 (Rattus norvegicus)
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Go to UniProtKB:  P54311
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UniProt GroupP54311
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2C [auth G],
F [auth K]
68Bos taurusMutation(s): 0 
Gene Names: GNG2
UniProt
Find proteins for P63212 (Bos taurus)
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Go to UniProtKB:  P63212
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UniProt GroupP63212
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.305 
  • R-Value Work: 0.276 
  • R-Value Observed: 0.278 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 126.009α = 90
b = 54.57β = 113.1
c = 138.35γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31300607
the Shanghai Science and Technology CommitteeChina13ZR1447600
the Shanghai Rising-Star ProgramChina14QA1404300
the Outstanding Young Scientist Foundation, Chinese Academy of SciencesChina--
the Youth Innovation Promotion Association CASChina--
the SANOFISIBS ScholarshipChina--
Amway (China)China--
the Jay and Betty Van Andel FoundationUnited States--
the Ministry of Science and Technology of ChinaChina2012CB910403
the Ministry of Science and Technology of ChinaChina2013CB910601
the Ministry of Science and Technology of ChinaChinaXDB08020303

Revision History  (Full details and data files)

  • Version 1.0: 2016-11-09
    Type: Initial release
  • Version 1.1: 2017-09-27
    Changes: Data collection, Derived calculations
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references