5VAF

Crystal structure of accessory secretion protein 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.771 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Unraveling the sequence of cytosolic reactions in the export of GspB adhesin fromStreptococcus gordonii.

Chen, Y.Bensing, B.A.Seepersaud, R.Mi, W.Liao, M.Jeffrey, P.D.Shajahan, A.Sonon, R.N.Azadi, P.Sullam, P.M.Rapoport, T.A.

(2018) J. Biol. Chem. 293: 5360-5373

  • DOI: 10.1074/jbc.RA117.000963
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Many pathogenic bacteria, including Streptococcus gordonii, possess a pathway for the cellular export of a single serine-rich-repeat protein that mediates the adhesion of bacteria to host cells and the extracellular matrix. This adhesin protein is O- ...

    Many pathogenic bacteria, including Streptococcus gordonii, possess a pathway for the cellular export of a single serine-rich-repeat protein that mediates the adhesion of bacteria to host cells and the extracellular matrix. This adhesin protein is O-glycosylated by several cytosolic glycosyltransferases and requires three accessory Sec proteins (Asp1-3) for export, but how the adhesin protein is processed for export is not well understood. Here, we report that the S. gordonii adhesin GspB is sequentially O-glycosylated by three enzymes (GtfA/B, Nss, and Gly) that attach N-acetylglucosamine and glucose to Ser/Thr residues. We also found that modified GspB is transferred from the last glycosyltransferase to the Asp1/2/3 complex. Crystal structures revealed that both Asp1 and Asp3 are related to carbohydrate-binding proteins, suggesting that they interact with carbohydrates and bind glycosylated adhesin, a notion that was supported by further analyses. We further observed that Asp1 also has an affinity for phospholipids, which is attenuated by Asp2. In summary, our findings support a model in which the GspB adhesin is sequentially glycosylated by GtfA/B, Nss, and Gly and then transferred to the Asp1/2/3 complex in which Asp1 mediates the interaction of the Asp1/2/3 complex with the lipid bilayer for targeting of matured GspB to the export machinery.


    Organizational Affiliation

    Harvard Medical School, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Accessory Sec system protein Asp1
A, B, C, D
533Streptococcus gordoniiMutation(s): 0 
Gene Names: asp1
Find proteins for Q9AET9 (Streptococcus gordonii)
Go to UniProtKB:  Q9AET9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.771 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.208 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 41.502α = 100.66
b = 99.897β = 90.07
c = 179.069γ = 95.78
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
PDB_EXTRACTdata extraction
PHENIXrefinement
Cootmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical InstituteUnited States--
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM052586
Helen Hay Whitney FoundationUnited States--

Revision History 

  • Version 1.0: 2018-02-21
    Type: Initial release
  • Version 1.1: 2018-02-28
    Type: Database references
  • Version 1.2: 2018-03-28
    Type: Data collection, Database references
  • Version 1.3: 2018-04-18
    Type: Data collection, Database references