SunS glycosin S-glycosyltransferase

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.208 

wwPDB Validation   3D Report Full Report

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Structural and mechanistic investigations of protein S-glycosyltransferases.

Fujinami, D.Garcia de Gonzalo, C.V.Biswas, S.Hao, Y.Wang, H.Garg, N.Lukk, T.Nair, S.K.van der Donk, W.A.

(2021) Cell Chem Biol 28: 1740-1749.e6

  • DOI: https://doi.org/10.1016/j.chembiol.2021.06.009
  • Primary Citation of Related Structures:  
    7MSK, 7MSN, 7MSP

  • PubMed Abstract: 

    Attachment of sugars to nitrogen and oxygen in peptides is ubiquitous in biology, but glycosylation of sulfur atoms has only been recently described. Here, we characterize two S-glycosyltransferases SunS and ThuS that selectively glycosylate one of five Cys residues in their substrate peptides; substitution of this Cys with Ser results in a strong decrease in glycosylation activity. Crystal structures of SunS and ThuS in complex with UDP-glucose or a derivative reveal an unusual architecture in which a glycosyltransferase type A (GTA) fold is decorated with additional domains to support homodimerization. Dimer formation creates an extended cavity for the substrate peptide, drawing functional analogy with O-glycosyltransferases involved in cell wall biosynthesis. This extended cavity contains a sharp bend that may explain the site selectivity of the glycosylation because the target Cys is in a Gly-rich stretch that can accommodate the bend. These studies establish a molecular framework for understanding the unusual S-glycosyltransferases.

  • Organizational Affiliation

    Howard Hughes Medical Institute and Roger Adams Laboratory, Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SPbeta prophage-derived glycosyltransferase SunS
A, B
422Bacillus subtilis subsp. subtilis str. 168Mutation(s): 0 
Gene Names: sunSyolJBSU21450
EC: 2.4.1
Find proteins for O31986 (Bacillus subtilis (strain 168))
Explore O31986 
Go to UniProtKB:  O31986
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO31986
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.208 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.73α = 90
b = 108.73β = 90
c = 210.697γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM079038

Revision History  (Full details and data files)

  • Version 1.0: 2022-04-13
    Type: Initial release
  • Version 1.1: 2024-05-22
    Changes: Data collection