2FY7

Crystal structure of the catalytic domain of the human beta1,4-galactosyltransferase mutant M339H in apo form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 

Starting Model: in silico
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wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Structural Snapshots of beta-1,4-Galactosyltransferase-I Along the Kinetic Pathway.

Ramakrishnan, B.Ramasamy, V.Qasba, P.K.

(2006) J Mol Biol 357: 1619-1633

  • DOI: https://doi.org/10.1016/j.jmb.2006.01.088
  • Primary Citation of Related Structures:  
    2FY7, 2FYA, 2FYB, 2FYC, 2FYD

  • PubMed Abstract: 

    During the catalytic cycle of beta1,4-galactosyltransferase-1 (Gal-T1), upon the binding of Mn(2+) followed by UDP-Gal, two flexible loops, a long and a short loop, change their conformation from open to closed. We have determined the crystal structures of a human M340H-Gal-T1 mutant in the open conformation (apo-enzyme), its Mn(2+) and Mn(2+)-UDP-Gal-bound complexes, and of a pentenary complex of bovine Gal-T1-Mn(2+)-UDP-GalNAc-Glc-alpha-lactalbumin. These studies show that during the conformational changes in Gal-T1, the coordination of Mn(2+) undergoes significant changes. It loses a coordination bond with a water molecule bound in the open conformation of Gal-T1 while forming a new coordination bond with another water molecule in the closed conformation, creating an active ground-state structure that facilitates enzyme catalysis. In the crystal structure of the pentenary complex, the N-acetylglucosamine (GlcNAc) moiety is found cleaved from UDP-GalNAc and is placed 2.7A away from the O4 oxygen atom of the acceptor Glc molecule, yet to form the product. The anomeric C1 atom of the cleaved GalNAc moiety has only two covalent bonds with its non-hydrogen atoms (O5 and C2 atoms), similar to either an oxocarbenium ion or N-acetylgalactal form, which are crystallographically indistinguishable at the present resolution. The structure also shows that the newly formed, metal-coordinating water molecule forms a hydrogen bond with the beta-phosphate group of the cleaved UDP moiety. This hydrogen bond formation results in the rotation of the beta-phosphate group of UDP away from the cleaved GalNAc moiety, thereby preventing the re-formation of the UDP-sugar during catalysis. Therefore, this water molecule plays an important role during catalysis in ensuring that the catalytic reaction proceeds in a forward direction.


  • Organizational Affiliation

    Structural Glycobiology Section, Nanobiology Program Center for Cancer Research, NCI-Frederick, Frederick, MD 21702, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-1,4-galactosyltransferase 1287Homo sapiensMutation(s): 3 
Gene Names: B4GALT1GGTB2
EC: 2.4.1.90 (PDB Primary Data), 2.4.1 (UniProt), 2.4.1.22 (UniProt), 2.4.1.275 (UniProt), 2.4.1.38 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for P15291 (Homo sapiens)
Explore P15291 
Go to UniProtKB:  P15291
PHAROS:  P15291
GTEx:  ENSG00000086062 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15291
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.35α = 90
b = 137.77β = 90
c = 66.21γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-03-14
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.4: 2024-04-03
    Changes: Data collection, Refinement description
  • Version 1.5: 2024-10-30
    Changes: Structure summary