2KW8

Solution Structure of Bacillus anthracis Sortase A (SrtA) Transpeptidase


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 40 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The Sortase A enzyme that attaches proteins to the cell wall of Bacillus anthracis contains an unusual active site architecture.

Weiner, E.M.Robson, S.Marohn, M.Clubb, R.T.

(2010) J Biol Chem 285: 23433-23443

  • DOI: https://doi.org/10.1074/jbc.M110.135434
  • Primary Citation of Related Structures:  
    2KW8

  • PubMed Abstract: 

    The pathogen Bacillus anthracis uses the Sortase A (SrtA) enzyme to anchor proteins to its cell wall envelope during vegetative growth. To gain insight into the mechanism of protein attachment to the cell wall in B. anthracis we investigated the structure, backbone dynamics, and function of SrtA. The NMR structure of SrtA has been determined with a backbone coordinate precision of 0.40 +/- 0.07 A. SrtA possesses several novel features not previously observed in sortase enzymes including the presence of a structurally ordered amino terminus positioned within the active site and in contact with catalytically essential histidine residue (His(126)). We propose that this appendage, in combination with a unique flexible active site loop, mediates the recognition of lipid II, the second substrate to which proteins are attached during the anchoring reaction. pK(a) measurements indicate that His(126) is uncharged at physiological pH compatible with the enzyme operating through a "reverse protonation" mechanism. Interestingly, NMR relaxation measurements and the results of a model building study suggest that SrtA recognizes the LPXTG sorting signal through a lock-in-key mechanism in contrast to the prototypical SrtA enzyme from Staphylococcus aureus.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1570, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
LPXTG-site transpeptidase family protein158Bacillus anthracisMutation(s): 0 
Gene Names: BA_0688GBAA0688GBAA_0688
UniProt
Find proteins for Q81V16 (Bacillus anthracis)
Explore Q81V16 
Go to UniProtKB:  Q81V16
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ81V16
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 40 
  • Selection Criteria: structures with the least restraint violations 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-05-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-02-05
    Changes: Data collection, Database references, Derived calculations, Other
  • Version 1.3: 2024-05-01
    Changes: Data collection, Database references