6YUV

Capsule O-acetyltransferase of Neisseria meningitidis serogroup A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 

Starting Model: experimental
View more details

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural and mechanistic basis of capsule O-acetylation in Neisseria meningitidis serogroup A.

Fiebig, T.Cramer, J.T.Bethe, A.Baruch, P.Curth, U.Fuhring, J.I.Buettner, F.F.R.Vogel, U.Schubert, M.Fedorov, R.Muhlenhoff, M.

(2020) Nat Commun 11: 4723-4723

  • DOI: https://doi.org/10.1038/s41467-020-18464-y
  • Primary Citation of Related Structures:  
    6YUO, 6YUQ, 6YUS, 6YUV

  • PubMed Abstract: 

    O-Acetylation of the capsular polysaccharide (CPS) of Neisseria meningitidis serogroup A (NmA) is critical for the induction of functional immune responses, making this modification mandatory for CPS-based anti-NmA vaccines. Using comprehensive NMR studies, we demonstrate that O-acetylation stabilizes the labile anomeric phosphodiester-linkages of the NmA-CPS and occurs in position C3 and C4 of the N-acetylmannosamine units due to enzymatic transfer and non-enzymatic ester migration, respectively. To shed light on the enzymatic transfer mechanism, we solved the crystal structure of the capsule O-acetyltransferase CsaC in its apo and acceptor-bound form and of the CsaC-H228A mutant as trapped acetyl-enzyme adduct in complex with CoA. Together with the results of a comprehensive mutagenesis study, the reported structures explain the strict regioselectivity of CsaC and provide insight into the catalytic mechanism, which relies on an unexpected Gln-extension of a classical Ser-His-Asp triad, embedded in an α/β-hydrolase fold.


  • Organizational Affiliation

    Institute of Clinical Biochemistry, Hannover Medical School, Hannover, Germany. Fiebig.Timm@mh-hannover.de.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SacC
A, B
255Neisseria meningitidis serogroup AMutation(s): 0 
Gene Names: sacC
UniProt
Find proteins for O68216 (Neisseria meningitidis serogroup A)
Explore O68216 
Go to UniProtKB:  O68216
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO68216
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 138.32α = 90
b = 138.32β = 90
c = 70.56γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research Foundation (DFG)Germany262794208
German Research Foundation (DFG)Germany412824531

Revision History  (Full details and data files)

  • Version 1.0: 2020-08-19
    Type: Initial release
  • Version 1.1: 2020-10-14
    Changes: Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Refinement description