Structure of PDB 2ah9 Chain A

Receptor sequence

>2ah9A (length=272) Species: 9606 (Homo sapiens)

LPACPEESPLLVGPMLIEFNMPVDLELVAKQNPNVKMGGRYAPRDCVSPH
KVAIIIPFRNRQEHLKYWLYYLHPVLQRQQLDYGIYVINQAGDTIFNRAK
LLNVGFQEALKDYDYTCFVFSDVDLIPMNDHNAYRCFSQPRHISVAMDKF
GFSLPYVQYFGGVSALSKQQFLTINGFPNNYWGWGGEDDDIFNRLVFRGM
SISRPNAVVGTTRHIRHSRDKKNEPNPQRFDRIAHTKETMLSDGLNSLTY
QVLDVQRYPLYTQITVDIGTPS

3D structure

• PDB: 2ah9 Oligosaccharide Preferences of beta1,4-Galactosyltransferase-I: Crystal Structures of Met340His Mutant of Human beta1,4-Galactosyltransferase-I with a Pentasaccharide and Trisaccharides of the N-Glycan Moiety
• Chain: A
• Resolution: 2.0 Å

Enzymatic activity

• Catalytic site (original residue number in PDB): D248 D250 W310 E313 D314 H340 H343 R345
• Catalytic site (residue number reindexed from 1): D122 D124 W184 E187 D188 H214 H217 R219
• Enzyme Commision number: 2.4.1.-
  2.4.1.22: lactose synthase.
  2.4.1.275: neolactotriaosylceramide beta-1,4-galactosyltransferase.
  2.4.1.38: beta-N-acetylglucosaminylglycopeptide beta-1,4-galactosyltransferase.
  2.4.1.90: N-acetyllactosamine synthase.

Interaction with ligand

Site #	Ligand	Ligand chain	Binding residues on receptor (original residue number in PDB)	Binding residues on receptor (residue number reindexed from 1)	Binding affinity
BS01	UDH	A	P183 F184 R185 R187 F222 D248 V249 D250 K275 W310 H343 R345 D346	P57 F58 R59 R61 F96 D122 V123 D124 K149 W184 H217 R219 D220
BS02	MN	A	D250 H340 H343	D124 H214 H217

Gene Ontology

Molecular Function

• GO:0016757 glycosyltransferase activity

Biological Process

• GO:0005975 carbohydrate metabolic process

External links

• PDB: RCSB:2ah9, PDBe:2ah9, PDBj:2ah9
• PDBsum: 2ah9
• PubMed: 16157350
• UniProt: P15291|B4GT1_HUMAN Beta-1,4-galactosyltransferase 1 (Gene Name=B4GALT1)