6LMJ

ASFV pA104R in complex with double-strand DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.257 

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Literature

The structural basis of African swine fever virus pA104R binding to DNA and its inhibition by stilbene derivatives.

Liu, R., Sun, Y., Chai, Y., Li, S., Li, S., Wang, L., Su, J., Yu, S., Yan, J., Gao, F., Zhang, G., Qiu, H.J., Gao, G.F., Qi, J., Wang, H.

(2020) Proc Natl Acad Sci U S A 117: 11000-11009

  • DOI: 10.1073/pnas.1922523117
  • Primary Citation of Related Structures:  
    6LMH, 6LMJ

  • PubMed Abstract: 

    • African swine fever virus (ASFV) is a highly contagious nucleocytoplasmic large DNA virus (NCLDV) that causes nearly 100% mortality in swine. The development of effective vaccines and drugs against this virus is urgently needed. pA104R, an ASFV-derived histone-like protein, shares sequence and functional similarity with bacterial HU/IHF family members and is essential for viral replication ...

    African swine fever virus (ASFV) is a highly contagious nucleocytoplasmic large DNA virus (NCLDV) that causes nearly 100% mortality in swine. The development of effective vaccines and drugs against this virus is urgently needed. pA104R, an ASFV-derived histone-like protein, shares sequence and functional similarity with bacterial HU/IHF family members and is essential for viral replication. Herein, we solved the crystal structures of pA104R in its apo state as well as in complex with DNA. Apo-pA104R forms a homodimer and folds into an architecture conserved in bacterial heat-unstable nucleoid proteins/integration host factors (HUs/IHFs). The pA104R-DNA complex structure, however, uncovers that pA104R has a DNA binding pattern distinct from its bacterial homologs, that is, the β-ribbon arms of pA104R stabilize DNA binding by contacting the major groove instead of the minor groove. Mutations of the basic residues at the base region of the β-strand DNA binding region (BDR), rather than those in the β-ribbon arms, completely abolished DNA binding, highlighting the major role of the BDR base in DNA binding. An overall DNA bending angle of 93.8° is observed in crystal packing of the pA104R-DNA complex structure, which is close to the DNA bending angle in the HU-DNA complex. Stilbene derivatives SD1 and SD4 were shown to disrupt the binding between pA104R and DNA and inhibit the replication of ASFV in primary porcine alveolar macrophages. Collectively, these results reveal the structural basis of pA104R binding to DNA highlighting the importance of the pA104R-DNA interaction in the ASFV replication cycle and provide inhibitor leads for ASFV chemotherapy.

    Organizational Affiliation: 

    CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, 100101 Beijing, China; gaof@im.ac.cn jxqi@im.ac.cn wanghan@im.ac.cn.



Macromolecules

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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
A104RA, B110African swine fever virusMutation(s): 0 
Gene Names: A104R, A104R CDS, BA71V-A104R, AFSV47Ss_0056, ASFV-Georgia_4-058
UniProt
Find proteins for P68742 (African swine fever virus (strain Badajoz 1971 Vero-adapted))
Explore P68742 
Go to UniProtKB:  P68742
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*TP*GP*CP*TP*TP*AP*TP*CP*AP*AP*TP*TP*TP*GP*TP*TP*GP*CP*A)-3')C, D19synthetic construct
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.257 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.358α = 90
b = 89.095β = 100.16
c = 53.227γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31941003
Chinese Academy of SciencesChinaKJZD-SW-L06-01
National Natural Science Foundation of China (NSFC)China31700149

Revision History  (Full details and data files)

  • Version 1.0: 2020-05-13
    Type: Initial release
  • Version 1.1: 2020-06-03
    Changes: Database references