Crystal structure of the Actinobacillus pleuropneumoniae HMW1C glycosyltransferase

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structural Insights into the Glycosyltransferase Activity of the Actinobacillus pleuropneumoniae HMW1C-like Protein.

Kawai, F.Grass, S.Kim, Y.Choi, K.J.St Geme, J.W.Yeo, H.J.

(2011) J Biol Chem 286: 38546-38557

  • DOI: https://doi.org/10.1074/jbc.M111.237602
  • Primary Citation of Related Structures:  
    3Q3E, 3Q3H, 3Q3I

  • PubMed Abstract: 

    Glycosylation of proteins is a fundamental process that influences protein function. The Haemophilus influenzae HMW1 adhesin is an N-linked glycoprotein that mediates adherence to respiratory epithelium, an essential early step in the pathogenesis of H. influenzae disease. HMW1 is glycosylated by HMW1C, a novel glycosyltransferase in the GT41 family that creates N-glycosidic linkages with glucose and galactose at asparagine residues and di-glucose linkages at sites of glucose modification. Here we report the crystal structure of Actinobacillus pleuropneumoniae HMW1C (ApHMW1C), a functional homolog of HMW1C. The structure of ApHMW1C contains an N-terminal all α-domain (AAD) fold and a C-terminal GT-B fold with two Rossmann-like domains and lacks the tetratricopeptide repeat fold characteristic of the GT41 family. The GT-B fold harbors the binding site for UDP-hexose, and the interface of the AAD fold and the GT-B fold forms a unique groove with potential to accommodate the acceptor protein. Structure-based functional analyses demonstrated that the HMW1C protein shares the same structure as ApHMW1C and provided insights into the unique bi-functional activity of HMW1C and ApHMW1C, suggesting an explanation for the similarities and differences of the HMW1C-like proteins compared with other GT41 family members.

  • Organizational Affiliation

    Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204. Electronic address: hyeo@uh.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HMW1C-like glycosyltransferase
A, B
631Actinobacillus pleuropneumoniae serovar 1 str. 4074Mutation(s): 0 
Gene Names: APL_1635appser1_17560
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.368α = 90
b = 94.677β = 90
c = 176.911γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
SHELXmodel building
HKL-3000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-08-24
    Type: Initial release
  • Version 1.1: 2011-09-28
    Changes: Database references
  • Version 1.2: 2011-11-16
    Changes: Database references