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 
  • R-Value Observed: 0.192 

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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 D Biol Crystallogr 68: 268-276

  • DOI: 10.1107/S0907444912001801
  • Primary Citation of Related Structures:  
    3SX3, 3SX5, 3SX7, 3SX8, 3SXA, 3SXB, 3SXC, 3SXD, 3SXE, 3SXG

  • 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, these two enzymes have been shown to recognize substrates through dramatic conformational changes in mobile polypeptide loops surrounding the active site ...

    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
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Histo-blood group ABO system transferaseA293Homo sapiensMutation(s): 0 
Gene Names: ABO
EC: 2.4.1.40 (PDB Primary Data), 2.4.1.37 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P16442 (Homo sapiens)
Explore P16442 
Go to UniProtKB:  P16442
PHAROS:  P16442
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16442
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
UDP
Query on UDP
Download Ideal Coordinates CCD File 
B [auth A]URIDINE-5'-DIPHOSPHATE
C9 H14 N2 O12 P2
XCCTYIAWTASOJW-XVFCMESISA-N		 Ligand Interaction
GAL
Query on GAL
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]		beta-D-galactopyranose
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N		 Ligand Interaction
MN
Query on MN
Download Ideal Coordinates CCD File 
E [auth A]MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-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 
  • R-Value Observed: 0.192 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 52.55α = 90
b = 149.63β = 90
c = 79.76γ = 90
Software Package:
Software NamePurpose
d*TREKdata reduction
REFMACrefinement
PDB_EXTRACTdata extraction
CrystalCleardata collection
d*TREKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-02-29
    Type: Initial release
  • Version 1.1: 2012-03-28
    Changes: Database references
  • Version 1.2: 2018-03-07
    Changes: Data collection
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary