7YPO

Cryo-EM structure of baculovirus LEF-3 in complex with ssDNA


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


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Literature

Structural transitions during the cooperative assembly of baculovirus single-stranded DNA-binding protein on ssDNA.

Yin, J.Fu, Y.Rao, G.Li, Z.Tian, K.Chong, T.Kuang, K.Wang, M.Hu, Z.Cao, S.

(2022) Nucleic Acids Res 50: 13100-13113

  • DOI: 10.1093/nar/gkac1142
  • Primary Citation of Related Structures:  
    7YNY, 7YPO, 7YPQ

  • PubMed Abstract: 
  • Single-stranded DNA-binding proteins (SSBs) interact with single-stranded DNA (ssDNA) to form filamentous structures with various degrees of cooperativity, as a result of intermolecular interactions between neighboring SSB subunits on ssDNA. However, it is still challenging to perform structural studies on SSB-ssDNA filaments at high resolution using the most studied SSB models, largely due to the intrinsic flexibility of these nucleoprotein complexes ...

    Single-stranded DNA-binding proteins (SSBs) interact with single-stranded DNA (ssDNA) to form filamentous structures with various degrees of cooperativity, as a result of intermolecular interactions between neighboring SSB subunits on ssDNA. However, it is still challenging to perform structural studies on SSB-ssDNA filaments at high resolution using the most studied SSB models, largely due to the intrinsic flexibility of these nucleoprotein complexes. In this study, HaLEF-3, an SSB protein from Helicoverpa armigera nucleopolyhedrovirus, was used for in vitro assembly of SSB-ssDNA filaments, which were structurally studied at atomic resolution using cryo-electron microscopy. Combined with the crystal structure of ssDNA-free HaLEF-3 octamers, our results revealed that the three-dimensional rearrangement of HaLEF-3 induced by an internal hinge-bending movement is essential for the formation of helical SSB-ssDNA complexes, while the contacting interface between adjacent HaLEF-3 subunits remains basically intact. We proposed a local cooperative SSB-ssDNA binding model, in which, triggered by exposure to oligonucleotides, HaLEF-3 molecules undergo ring-to-helix transition to initiate continuous SSB-SSB interactions along ssDNA. Unique structural features revealed by the assembly of HaLEF-3 on ssDNA suggest that HaLEF-3 may represent a new class of SSB.


    Organizational Affiliation

    CAS Key Laboratory of Special Pathogens, Wuhan Institute of Virology, Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan 430071, PR China.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Lef3A, B, C, D413Helicoverpa armigera nucleopolyhedrovirusMutation(s): 0 
UniProt
Find proteins for Q91BW6 (Helicoverpa armigera nucleopolyhedrovirus)
Explore Q91BW6 
Go to UniProtKB:  Q91BW6
Entity Groups  
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UniProt GroupQ91BW6
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (28-MER)E [auth Q]28synthetic construct
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (MoST, China)China2018YFA0507200

Revision History  (Full details and data files)

  • Version 1.0: 2023-01-25
    Type: Initial release