8GMS

Structure of LexA in complex with RecA filament


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.31 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis for regulation of SOS response in bacteria.

Gao, B.Liang, L.Su, L.Wen, A.Zhou, C.Feng, Y.

(2023) Proc Natl Acad Sci U S A 120: e2217493120-e2217493120

  • DOI: https://doi.org/10.1073/pnas.2217493120
  • Primary Citation of Related Structures:  
    7YWA, 8GMS, 8GMT, 8GMU

  • PubMed Abstract: 

    In response to DNA damage, bacterial RecA protein forms filaments with the assistance of DinI protein. The RecA filaments stimulate the autocleavage of LexA, the repressor of more than 50 SOS genes, and activate the SOS response. During the late phase of SOS response, the RecA filaments stimulate the autocleavage of UmuD and λ repressor CI, leading to mutagenic repair and lytic cycle, respectively. Here, we determined the cryo-electron microscopy structures of Escherichia coli RecA filaments in complex with DinI, LexA, UmuD, and λCI by helical reconstruction. The structures reveal that LexA and UmuD dimers bind in the filament groove and cleave in an intramolecular and an intermolecular manner, respectively, while λCI binds deeply in the filament groove as a monomer. Despite their distinct folds and oligomeric states, all RecA filament binders recognize the same conserved protein features in the filament groove. The SOS response in bacteria can lead to mutagenesis and antimicrobial resistance, and our study paves the way for rational drug design targeting the bacterial SOS response.


  • Organizational Affiliation

    Department of Biophysics, and Department of Infectious Disease of Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
LexA repressor
A, B
128Escherichia coliMutation(s): 2 
Gene Names: lexA
EC: 3.4.21.88
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Protein RecAC [auth F],
D [auth G]
353Escherichia coliMutation(s): 0 
Gene Names: recA
UniProt
Find proteins for A0A485JBB4 (Escherichia coli)
Explore A0A485JBB4 
Go to UniProtKB:  A0A485JBB4
Entity Groups  
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UniProt GroupA0A485JBB4
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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(P*TP*TP*TP*TP*TP*T)-3')E [auth S]6Escherichia coli
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.31 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China31970040

Revision History  (Full details and data files)

  • Version 1.0: 2022-12-21
    Type: Initial release
  • Version 1.1: 2023-01-18
    Changes: Database references
  • Version 1.2: 2024-07-03
    Changes: Data collection