4OWX

Structural basis of SOSS1 in complex with a 12nt ssDNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 

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This is version 1.3 of the entry. See complete history. 


Literature

Structural Basis of SOSS1 Complex Assembly and Recognition of ssDNA.

Ren, W., Chen, H., Sun, Q., Tang, X., Lim, S.C., Huang, J., Song, H.

(2014) Cell Rep 6: 982-991

  • DOI: https://doi.org/10.1016/j.celrep.2014.02.020
  • Primary Citation of Related Structures:  
    4OWT, 4OWW, 4OWX

  • PubMed Abstract: 

    • The SOSS1 complex comprising SOSSA, SOSSB1, and SOSSC senses single-stranded DNA (ssDNA) and promotes repair of DNA double-strand breaks (DSBs). But how SOSS1 is assembled and recognizes ssDNA remains elusive. The crystal structure of the N-terminal half of SOSSA (SOSSAN) in complex with SOSSB1 and SOSSC showed that SOSSAN serves as a scaffold to bind both SOSSB1 and SOSSC for assembly of the SOSS1 complex ...

    The SOSS1 complex comprising SOSSA, SOSSB1, and SOSSC senses single-stranded DNA (ssDNA) and promotes repair of DNA double-strand breaks (DSBs). But how SOSS1 is assembled and recognizes ssDNA remains elusive. The crystal structure of the N-terminal half of SOSSA (SOSSAN) in complex with SOSSB1 and SOSSC showed that SOSSAN serves as a scaffold to bind both SOSSB1 and SOSSC for assembly of the SOSS1 complex. The structures of SOSSAN/B1 in complex with a 12 nt ssDNA and SOSSAN/B1/C in complex with a 35 nt ssDNA showed that SOSSB1 interacts with both SOSSAN and ssDNA via two distinct surfaces. Recognition of ssDNA with a length of up to nine nucleotides is mediated solely by SOSSB1, whereas neither SOSSC nor SOSSAN are critical for ssDNA binding. These results reveal the structural basis of SOSS1 assembly and provide a framework for further study of the mechanism governing longer ssDNA recognition by the SOSS1 complex during DSB repair.

    Organizational Affiliation: 

    Life Sciences Institute, Zhejiang University, 388 Yuhangtang Road, Hangzhou 310058, China; Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673, Singapore; Department of Biochemistry, National University of Singapore, 14 Science Drive, Singapore 117543, Singapore. Electronic address: haiwei@imcb.a-star.edu.sg.



Macromolecules

Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Integrator complex subunit 3B [auth A]500Homo sapiensMutation(s): 0 
Gene Names: INTS3, C1orf193, C1orf60
UniProt
Find proteins for Q68E01 (Homo sapiens)
Explore Q68E01 
Go to UniProtKB:  Q68E01
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ68E01
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
SOSS complex subunit B1C [auth B]211Homo sapiensMutation(s): 0 
Gene Names: NABP2, OBFC2B, SSB1, LP3587
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BQ15 (Homo sapiens)
Explore Q9BQ15 
Go to UniProtKB:  Q9BQ15
PHAROS:  Q9BQ15
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BQ15
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*TP*TP*TP*TP*TP*TP*TP*TP*T)-3')A [auth L]12Homo sapiens
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.185 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.63α = 90
b = 162.52β = 90
c = 65.74γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
the Agency for Science, Technology and ResearchSingapore--
National Natural Science Foundation of China (NSFC)China31270816

Revision History  (Full details and data files)

  • Version 1.0: 2014-04-16
    Type: Initial release
  • Version 1.1: 2014-12-03
    Changes: Database references
  • Version 1.2: 2017-09-06
    Changes: Author supporting evidence, Derived calculations, Source and taxonomy
  • Version 1.3: 2020-01-08
    Changes: Author supporting evidence