4EE4

Crystal structure of human M340H-beta-1,4-galactosyltransferase-1 (M340H-B4GAL-T1) in complex with tetrasaccharide from Lacto-N-neohexose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

Starting Model: experimental
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This is version 2.2 of the entry. See complete history


Literature

Binding of N-acetylglucosamine (GlcNAc) beta 1-6-branched oligosaccharide acceptors to beta 4-galactosyltransferase I reveals a new ligand binding mode.

Ramakrishnan, B.Boeggeman, E.Qasba, P.K.

(2012) J Biol Chem 287: 28666-28674

  • DOI: https://doi.org/10.1074/jbc.M112.373514
  • Primary Citation of Related Structures:  
    4EE3, 4EE4, 4EE5, 4EEA, 4EEG, 4EEM, 4EEO

  • PubMed Abstract: 

    N-acetyllactosamine is the most prevalent disaccharide moiety in the glycans on the surface of mammalian cells and often found as repeat units in the linear and branched polylactosamines, known as i- and I-antigen, respectively. The β1-4-galactosyltransferase-I (β4Gal-T1) enzyme is responsible for the synthesis of the N-acetyllactosamine moiety. To understand its oligosaccharide acceptor specificity, we have previously investigated the binding of tri- and pentasaccharides of N-glycan with a GlcNAc at their nonreducing end and found that the extended sugar moiety in these acceptor substrates binds to the crevice present at the acceptor substrate binding site of the β4Gal-T1 molecule. Here we report seven crystal structures of β4Gal-T1 in complex with an oligosaccharide acceptor with a nonreducing end GlcNAc that has a β1-6-glycosidic link and that are analogous to either N-glycan or i/I-antigen. In the crystal structure of the complex of β4Gal-T1 with I-antigen analog pentasaccharide, the β1-6-branched GlcNAc moiety is bound to the sugar acceptor binding site of the β4Gal-T1 molecule in a way similar to the crystal structures described previously; however, the extended linear tetrasaccharide moiety does not interact with the previously found extended sugar binding site on the β4Gal-T1 molecule. Instead, it interacts with the different hydrophobic surface of the protein molecule formed by the residues Tyr-276, Trp-310, and Phe-356. Results from the present and previous studies suggest that β4Gal-T1 molecule has two different oligosaccharide binding regions for the binding of the extended oligosaccharide moiety of the acceptor substrate.


  • Organizational Affiliation

    Structural Glycobiology Section, SAIC-Frederick, Inc., Center for Cancer Research Nanobiology Program, Center for Cancer Research, Frederick National Laboratory for Cancer Research, National Institutes of Health, Frederick, Maryland 21702, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-1,4-galactosyltransferase 1
A, B, C
287Homo sapiensMutation(s): 3 
Gene Names: B4GALT1GGTB2
EC: 2.4.1 (PDB Primary Data), 2.4.1.22 (PDB Primary Data), 2.4.1.90 (PDB Primary Data), 2.4.1.38 (PDB Primary Data), 2.4.1.275 (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
Oligosaccharides

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Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-3)-[2-acetamido-2-deoxy-beta-D-glucopyranose-(1-6)]beta-D-galactopyranose-(1-4)-beta-D-glucopyranose
D, E, F
4N/A
Glycosylation Resources
GlyTouCan:  G11519LL
GlyCosmos:  G11519LL
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
UDP
Query on UDP

Download Ideal Coordinates CCD File 
FA [auth C],
G [auth A],
Q [auth B]
URIDINE-5'-DIPHOSPHATE
C9 H14 N2 O12 P2
XCCTYIAWTASOJW-XVFCMESISA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
AA [auth B]
BA [auth B]
CA [auth B]
HA [auth C]
I [auth A]
AA [auth B],
BA [auth B],
CA [auth B],
HA [auth C],
I [auth A],
IA [auth C],
J [auth A],
JA [auth C],
K [auth A],
KA [auth C],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
S [auth B],
T [auth B],
U [auth B],
V [auth B],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
GOL
Query on GOL

Download Ideal Coordinates CCD File 
DA [auth B],
EA [auth B],
LA [auth C],
P [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
MN
Query on MN

Download Ideal Coordinates CCD File 
GA [auth C],
H [auth A],
R [auth B]
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.364α = 90
b = 195.969β = 90
c = 143.776γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-07-04
    Type: Initial release
  • Version 1.1: 2014-03-26
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary
  • Version 2.1: 2023-09-13
    Changes: Data collection, Database references, Refinement description, Structure summary
  • Version 2.2: 2024-11-20
    Changes: Structure summary