1FGX

CRYSTAL STRUCTURE OF THE BOVINE BETA 1,4 GALACTOSYLTRANSFERASE (B4GALT1) CATALYTIC DOMAIN COMPLEXED WITH UMP

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.225 

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This is version 1.3 of the entry. See complete history. 


Literature

Crystal structures of the bovine beta4galactosyltransferase catalytic domain and its complex with uridine diphosphogalactose.

Gastinel, L.N., Cambillau, C., Bourne, Y.

(1999) EMBO J 18: 3546-3557

  • DOI: 10.1093/emboj/18.13.3546
  • Primary Citation of Related Structures:  
    1FGX, 1FR8

  • PubMed Abstract: 

    • beta1,4-galactosyltransferase T1 (beta4Gal-T1, EC 2.4.1.90/38), a Golgi resident membrane-bound enzyme, transfers galactose from uridine diphosphogalactose to the terminal beta-N-acetylglucosamine residues forming the poly-N-acetyllactosamine core structures present in glycoproteins and glycosphingolipids ...

    beta1,4-galactosyltransferase T1 (beta4Gal-T1, EC 2.4.1.90/38), a Golgi resident membrane-bound enzyme, transfers galactose from uridine diphosphogalactose to the terminal beta-N-acetylglucosamine residues forming the poly-N-acetyllactosamine core structures present in glycoproteins and glycosphingolipids. In mammals, beta4Gal-T1 binds to alpha-lactalbumin, a protein that is structurally homologous to lyzozyme, to produce lactose. beta4Gal-T1 is a member of a large family of homologous beta4galactosyltransferases that use different types of glycoproteins and glycolipids as substrates. Here we solved and refined the crystal structures of recombinant bovine beta4Gal-T1 to 2.4 A resolution in the presence and absence of the substrate uridine diphosphogalactose. The crystal structure of the bovine substrate-free beta4Gal-T1 catalytic domain showed a new fold consisting of a single conical domain with a large open pocket at its base. In the substrate-bound complex, the pocket encompassed residues interacting with uridine diphosphogalactose. The structure of the complex contained clear regions of electron density for the uridine diphosphate portion of the substrate, where its beta-phosphate group was stabilized by hydrogen-bonding contacts with conserved residues including the Asp252ValAsp254 motif. These results help the interpretation of engineered beta4Gal-T1 point mutations. They suggest a mechanism possibly involved in galactose transfer and enable identification of the critical amino acids involved in alpha-lactalbumin interactions.

    Organizational Affiliation: 

    Architecture et Fonction des Macromolécules Biologiques (AFMB), CNRS, UPR 9039, 31 Chemin Joseph Aiguier 13402 Marseille Cedex 20, France. gastinel@afmb.cnrs-mrs.fr



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BETA 1,4 GALACTOSYLTRANSFERASEA, B288Bos taurusMutation(s): 0 
Gene Names: B4GALT1, GALT, GGTB2
EC: 2.4.1.38 (PDB Primary Data), 2.4.1 (UniProt), 2.4.1.22 (UniProt), 2.4.1.90 (UniProt), 2.4.1.275 (UniProt)
UniProt
Find proteins for P08037 (Bos taurus)
Explore P08037 
Go to UniProtKB:  P08037
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08037
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
U5P
Query on U5P
Download Ideal Coordinates CCD File 
C [auth B]URIDINE-5'-MONOPHOSPHATE
C9 H13 N2 O9 P
DJJCXFVJDGTHFX-XVFCMESISA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.225 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.5α = 90
b = 161β = 90
c = 107.4γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALAdata scaling
DMmodel building
CNSrefinement
CCP4data scaling
DMphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-08-16
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-07-21
    Changes: Data collection, Derived calculations, Refinement description