1lz7: Difference between revisions
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{{STRUCTURE_1lz7| PDB=1lz7 | SCENE= }} | |||
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'''Glycosyltransferase B''' | '''Glycosyltransferase B''' | ||
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[[Category: Seto, N O.L.]] | [[Category: Seto, N O.L.]] | ||
[[Category: Szpacenko, A.]] | [[Category: Szpacenko, A.]] | ||
[[Category: | [[Category: Blood group antigen]] | ||
[[Category: | [[Category: Glycoprotein]] | ||
[[Category: | [[Category: Signal-anchor]] | ||
[[Category: | [[Category: Transmembrane]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:26:38 2008'' | |||
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Revision as of 00:26, 3 May 2008
Glycosyltransferase B
OverviewOverview
The human ABO(H) blood group antigens are produced by specific glycosyltransferase enzymes. An N-acetylgalactosaminyltransferase (GTA) uses a UDP-GalNAc donor to convert the H-antigen acceptor to the A antigen, whereas a galactosyltransferase (GTB) uses a UDP-galactose donor to convert the H-antigen acceptor to the B antigen. GTA and GTB differ only in the identity of four critical amino acid residues. Crystal structures at 1.8-1.32 A resolution of the GTA and GTB enzymes both free and in complex with disaccharide H-antigen acceptor and UDP reveal the basis for donor and acceptor specificity and show that only two of the critical amino acid residues are positioned to contact donor or acceptor substrates. Given the need for stringent stereo- and regioselectivity in this biosynthesis, these structures further demonstrate that the ability of the two enzymes to distinguish between the A and B donors is largely determined by a single amino acid residue.
About this StructureAbout this Structure
1LZ7 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
The structural basis for specificity in human ABO(H) blood group biosynthesis., Patenaude SI, Seto NO, Borisova SN, Szpacenko A, Marcus SL, Palcic MM, Evans SV, Nat Struct Biol. 2002 Sep;9(9):685-90. PMID:12198488 Page seeded by OCA on Sat May 3 00:26:38 2008