5FCG

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.255 

wwPDB Validation 3D Report Full Report


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.USA --: --

  • DOI: 10.1073/pnas.1525616113

  • 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 ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Apoptosis regulator Bcl-2
A
168Homo sapiensGene Names: BCL2
Find proteins for P10415 (Homo sapiens)
Go to Gene View: BCL2
Go to UniProtKB:  P10415
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein X
C
26Hepatitis B virus genotype F2Gene Names: X
Find proteins for Q99HR6 (Hepatitis B virus genotype F2)
Go to UniProtKB:  Q99HR6
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.255 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 63.777α = 90.00
b = 82.990β = 90.00
c = 33.487γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data processing
HKL-2000data scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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