1CI4

THE CRYSTAL STRUCTURE OF HUMAN BARRIER-TO-AUTOINTEGRATION FACTOR (BAF)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.210 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Structural basis of DNA bridging by barrier-to-autointegration factor.

Umland, T.C.Wei, S.Q.Craigie, R.Davies, D.R.

(2000) Biochemistry 39: 9130-9138

  • DOI: 10.1021/bi000572w
  • Primary Citation of Related Structures:  
    1CI4

  • PubMed Abstract: 
  • Barrier-to-autointegration factor (BAF) is a host cell protein that plays a crucial role in retroviral integration. Preintegration complexes (PICs) stripped of BAF lose their normal integration activity, which can be restored by incubation with purified BAF ...

    Barrier-to-autointegration factor (BAF) is a host cell protein that plays a crucial role in retroviral integration. Preintegration complexes (PICs) stripped of BAF lose their normal integration activity, which can be restored by incubation with purified BAF. BAF bridges double-stranded DNA both intra- and intermolecularly in a non-sequence-specific manner, leading to the formation of a nucleoprotein network. BAF also binds to the nuclear protein lamina-associated polypeptide 2 (LAP2), and is localized with chromatin during interphase and mitosis. The crystal structure of homodimeric human BAF has been determined to 1.9 A resolution. The fold of the BAF monomer resembles that of the second domain of RuvA. This comparison revealed the presence of the helix-hairpin-helix (HhH) nonspecific DNA binding motif within BAF. A novel feature of BAF's HhH motif is the occupation of the metal binding site by the epsilon-amino group of Lys 6, providing an alternative means of sequestering positive charge. Mutational analysis corroborates the HhH motif's prominent role in DNA binding and argues against a previously proposed helix-turn-helix (HTH) binding site located in another region of the monomer. A model of BAF bridging DNA via the HhH motif is proposed.


    Related Citations: 
    • A previously unidentified host protein protects retroviral DNA from autointegration.
      Lee, M.S., Craigie, R.
      (1998) Proc Natl Acad Sci U S A 95: 1528
    • Protection of retroviral DNA from autointegration: involvement of a cellular factor.
      Lee, M.S., Craigie, R.
      (1994) Proc Natl Acad Sci U S A 91: 9823

    Organizational Affiliation

    Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (BARRIER-TO-AUTOINTEGRATION FACTOR (BAF))A, B89Homo sapiensMutation(s): 2 
Gene Names: BANF1BAFBCRG1
Find proteins for O75531 (Homo sapiens)
Explore O75531 
Go to UniProtKB:  O75531
NIH Common Fund Data Resources
PHAROS:  O75531
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, BL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.210 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.8α = 90
b = 41.8β = 90
c = 214.6γ = 90
Software Package:
Software NamePurpose
SOLVEphasing
PHASES-95model building
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
PHASESphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-08-16
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2019-11-27
    Changes: Atomic model, Database references, Derived calculations