View source for 1g93

[[Image:1g93.jpg|left|200px]]

 {{Structure
|PDB= 1g93 |SIZE=350|CAPTION= <scene name='initialview01'>1g93</scene>, resolution 2.5&Aring;
|SITE= 
|LIGAND= <scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene>, <scene name='pdbligand=HG:MERCURY+(II)+ION'>HG</scene>, <scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=UPG:URIDINE-5&#39;-DIPHOSPHATE-GLUCOSE'>UPG</scene>
|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/N-acetyllactosaminide_3-alpha-galactosyltransferase N-acetyllactosaminide 3-alpha-galactosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.1.87 2.4.1.87] </span>
|GENE= GGTA1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9913 Bos taurus])
|DOMAIN=
|RELATEDENTRY=[[1fg5|1fg5]], [[1g8o|1G8O]]
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1g93 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g93 OCA], [http://www.ebi.ac.uk/pdbsum/1g93 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1g93 RCSB]</span>
}}

'''CRYSTAL STRUCTURE OF THE BOVINE CATALYTIC DOMAIN OF ALPHA-1,3-GALACTOSYLTRANSFERASE IN THE PRESENCE OF UDP-GALACTOSE'''


==Overview==
alpha1,3-galactosyltransferase (alpha3GalT, EC 2.4.1.151) is a Golgi-resident, type II transmembrane protein that transfers galactose from UDP-alpha-galactose to the terminal N:-acetyllactosamine unit of glycoconjugate glycans, producing the Galalpha1,3Galbeta1,4GlcNAc oligosaccharide structure present in most mammalian glycoproteins. Unlike most other mammals, humans and Old World primates do not possess alpha3GalT activity, which is relevant for the hyperacute rejection observed in pig-to-human xenotransplantation. The crystal structure of the catalytic domain of substrate-free bovine alpha3GalT, solved and refined to 2.3 A resolution, has a globular shape with an alpha/beta fold containing a narrow cleft on one face, and shares a UDP-binding domain (UBD) with the recently solved inverting glycosyltransferases. The substrate-bound complex, solved and refined to 2.5 A, allows the description of residues interacting directly with UDP-galactose. These structural data suggest that the strictly conserved residue E317 is likely to be the catalytic nucleophile involved in galactose transfer with retention of anomeric configuration as accomplished by this enzyme. Moreover, the alpha3GalT structure helps to identify amino acid residues that determine the specificities of the highly homologous ABO histo-blood group and glycosphingolipid glycosyltransferases.

==About this Structure==
1G93 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G93 OCA]. 

==Reference==
Bovine alpha1,3-galactosyltransferase catalytic domain structure and its relationship with ABO histo-blood group and glycosphingolipid glycosyltransferases., Gastinel LN, Bignon C, Misra AK, Hindsgaul O, Shaper JH, Joziasse DH, EMBO J. 2001 Feb 15;20(4):638-49. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11179209 11179209]
[[Category: Bos taurus]]
[[Category: N-acetyllactosaminide 3-alpha-galactosyltransferase]]
[[Category: Single protein]]
[[Category: Bignon, C.]]
[[Category: Gastinel, L N.]]
[[Category: Hindsgaul, O.]]
[[Category: Joziasse, D H.]]
[[Category: Misra, A K.]]
[[Category: Shaper, J H.]]
[[Category: alpha-beta-alpha]]
[[Category: glycosyltransferase]]
[[Category: udp binding protein]]

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