3SXE

Crystal structure of AAAA+UDP+Gal with Glycerol as the cryoprotectant

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.49 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

Sequence-dependent effects of cryoprotectants on the active sites of the human ABO(H) blood group A and B glycosyltransferases.

Johal, A.R., Schuman, B., Alfaro, J.A., Borisova, S., Seto, N.O., Evans, S.V.

(2012) Acta Crystallogr.,Sect.D 68: 268-276

  • DOI: 10.1107/S0907444912001801
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • The human ABO(H) A and B blood group glycosyltransferases GTA and GTB differ by only four amino acids, yet this small dissimilarity is responsible for significant differences in biosynthesis, kinetics and structure. Like other glycosyltransferases, t ...

    The human ABO(H) A and B blood group glycosyltransferases GTA and GTB differ by only four amino acids, yet this small dissimilarity is responsible for significant differences in biosynthesis, kinetics and structure. Like other glycosyltransferases, these two enzymes have been shown to recognize substrates through dramatic conformational changes in mobile polypeptide loops surrounding the active site. Structures of GTA, GTB and several chimeras determined by single-crystal X-ray diffraction demonstrate a range of susceptibility to the choice of cryoprotectant, in which the mobile polypeptide loops can be induced by glycerol to form the ordered closed conformation associated with substrate recognition and by MPD [hexylene glycol, (±)-2-methyl-2,4-pentanediol] to hinder binding of substrate in the active site owing to chelation of the Mn²⁺ cofactor and thereby adopt the disordered open state. Glycerol is often avoided as a cryoprotectant when determining the structures of carbohydrate-active enzymes as it may act as a competitive inhibitor for monosaccharide ligands. Here, it is shown that the use of glycerol as a cryoprotectant can additionally induce significant changes in secondary structure, a phenomenon that could apply to any class of protein.

    Organizational Affiliation: 

    Department of Biochemistry and Microbiology, University of Victoria, Victoria, BC V8W 3P6, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Histo-blood group ABO system transferase
A
293Homo sapiensMutation(s): 0 
Gene Names: ABO
Find proteins for P16442 (Homo sapiens)
Go to Gene View: ABO
Go to UniProtKB:  P16442
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN
Download SDF File 
Download CCD File 
A
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
GAL
Query on GAL
Download SDF File 
Download CCD File 
A
BETA-D-GALACTOSE
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N
 Ligand Interaction
UDP
Query on UDP
Download SDF File 
Download CCD File 
A
URIDINE-5'-DIPHOSPHATE
C9 H14 N2 O12 P2
XCCTYIAWTASOJW-XVFCMESISA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.49 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.190 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 52.550α = 90.00
b = 149.630β = 90.00
c = 79.760γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
CrystalCleardata collection
MOLREPphasing
PDB_EXTRACTdata extraction
d*TREKdata scaling
d*TREKdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-29
    Type: Initial release
  • Version 1.1: 2012-03-28
    Type: Database references
  • Version 1.2: 2018-03-07
    Type: Data collection