5FCG

Crystal structure of Bcl-2 in complex with HBx-BH3 motif

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.256 

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This is version 1.1 of the entry. See complete history. 


Literature

Structural and biochemical analysis of Bcl-2 interaction with the hepatitis B virus protein HBx

Jiang, T.Y., Liu, M.H., Wu, J.P., Shi, Y.G.

(2016) Proc Natl Acad Sci U S A 

  • DOI: 10.1073/pnas.1525616113
  • Primary Citation of Related Structures:  
    5FCG

  • PubMed Abstract: 

    • HBx is a hepatitis B virus protein that is required for viral infectivity and replication. Anti-apoptotic Bcl-2 family members are thought to be among the important host targets of HBx. However, the structure and function of HBx are poorly understood and the molecular mechanism of HBx-induced carcinogenesis remains unknown ...

    HBx is a hepatitis B virus protein that is required for viral infectivity and replication. Anti-apoptotic Bcl-2 family members are thought to be among the important host targets of HBx. However, the structure and function of HBx are poorly understood and the molecular mechanism of HBx-induced carcinogenesis remains unknown. In this study, we report biochemical and structural characterization of HBx. The recombinant HBx protein contains metal ions, in particular iron and zinc. A BH3-like motif in HBx (residues 110-135) binds Bcl-2 with a dissociation constant of ∼193 μM, which is drastically lower than that for a canonical BH3 motif from Bim or Bad. Structural analysis reveals that, similar to other BH3 motifs, the BH3-like motif of HBx adopts an amphipathic α-helix and binds the conserved BH3-binding groove on Bcl-2. Unlike the helical Bim or Bad BH3 motif, the C-terminal portion of the bound HBx BH3-like motif has an extended conformation and makes considerably fewer interactions with Bcl-2. These observations suggest that HBx may modulate Bcl-2 function in a way that is different from that of the classical BH3-only proteins.

    Organizational Affiliation: 

    Ministry of Education Key Laboratory of Protein Science, Tsinghua-Peking Joint Center for Life Sciences, Beijing Advanced Innovation Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China shi-lab@tsinghua.edu.cn.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Apoptosis regulator Bcl-2A168Homo sapiensMutation(s): 0 
Gene Names: BCL2
Find proteins for P10415 (Homo sapiens)
Explore P10415 
Go to UniProtKB:  P10415
NIH Common Fund Data Resources
PHAROS:  P10415
GTEx:  ENSG00000171791
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protein XB [auth C]26Hepatitis B virusMutation(s): 0 
Find proteins for Q99HR6 (Hepatitis B virus genotype F2 (isolate Argentina/sa16/2000))
Explore Q99HR6 
Go to UniProtKB:  Q99HR6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.255 
  • R-Value Observed: 0.256 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.777α = 90
b = 82.99β = 90
c = 33.487γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data processing
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-02-10
    Type: Initial release
  • Version 1.1: 2016-02-24
    Changes: Database references, Other