Solution Structure of the SPOR domain from E. coli DamX

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 250 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 

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Nuclear Magnetic Resonance Solution Structure of the Peptidoglycan-Binding SPOR Domain from Escherichia coli DamX: Insights into Septal Localization.

Williams, K.B.Yahashiri, A.Arends, S.J.Popham, D.L.Fowler, C.A.Weiss, D.S.

(2013) Biochemistry 52: 627-639

  • DOI: https://doi.org/10.1021/bi301609e
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    SPOR domains are present in thousands of bacterial proteins and probably bind septal peptidoglycan (PG), but the details of the SPOR-PG interaction have yet to be elucidated. Here we characterize the structure and function of the SPOR domain for an Escherichia coli division protein named DamX. Nuclear magnetic resonance revealed the domain comprises a four-stranded antiparallel β-sheet buttressed on one side by two α-helices. A third helix, designated α3, associates with the other face of the β-sheet, but this helix is relatively mobile. Site-directed mutagenesis revealed the face of the β-sheet that interacts with α3 is important for septal localization and binding to PG sacculi. The position and mobility of α3 suggest it might regulate PG binding, but although α3 deletion mutants still localized to the septal ring, they were too unstable to use in a PG binding assay. Finally, to assess the importance of the SPOR domain in DamX function, we constructed and characterized E. coli mutants that produced DamX proteins with SPOR domain point mutations or SPOR domain deletions. These studies revealed the SPOR domain is important for multiple activities associated with DamX: targeting the protein to the division site, conferring full resistance to the bile salt deoxycholate, improving the efficiency of cell division when DamX is produced at normal levels, and inhibiting cell division when DamX is overproduced.

  • Organizational Affiliation

    Department of Microbiology, Carver College of Medicine, The University of Iowa, Iowa City, IA 52242, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein damX106Escherichia coli K-12Mutation(s): 0 
Gene Names: b3388damXyhfB
Find proteins for P11557 (Escherichia coli (strain K12))
Explore P11557 
Go to UniProtKB:  P11557
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP11557
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 250 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-07-18
    Type: Initial release
  • Version 1.1: 2013-02-06
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Advisory, Data collection, Database references, Derived calculations, Other