1xz6

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{{STRUCTURE_1xz6| PDB=1xz6 | SCENE= }}
{{STRUCTURE_1xz6| PDB=1xz6 | SCENE= }}
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'''Mutant ABO(H) blood group glycosyltransferase A'''
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===Mutant ABO(H) blood group glycosyltransferase A===
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==Overview==
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The human ABO(H) blood group antigens are carbohydrate structures generated by glycosyltransferase enzymes. Glycosyltransferase A (GTA) uses UDP-GalNAc as a donor to transfer a monosaccharide residue to Fuc alpha1-2Gal beta-R (H)-terminating acceptors. Similarly, glycosyltransferase B (GTB) catalyzes the transfer of a monosaccharide residue from UDP-Gal to the same acceptors. These are highly homologous enzymes differing in only four of 354 amino acids, Arg/Gly-176, Gly/Ser-235, Leu/Met-266, and Gly/Ala-268. Blood group O usually stems from the expression of truncated inactive forms of GTA or GTB. Recently, an O(2) enzyme was discovered that was a full-length form of GTA with three mutations, P74S, R176G, and G268R. We showed previously that the R176G mutation increased catalytic activity with minor effects on substrate binding. Enzyme kinetics and high resolution structural studies of mutant enzymes based on the O(2) blood group transferase reveal that whereas the P74S mutation in the stem region of the protein does not appear to play a role in enzyme inactivation, the G268R mutation completely blocks the donor GalNAc-binding site leaving the acceptor binding site unaffected.
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(as it appears on PubMed at http://www.pubmed.gov), where 15475562 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15475562}}
==Disease==
==Disease==
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[[Category: Zheng, R B.]]
[[Category: Zheng, R B.]]
[[Category: Rossman nucleotide binding fold]]
[[Category: Rossman nucleotide binding fold]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 15:41:27 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 15:17:38 2008''

Revision as of 12:17, 29 July 2008

Image:1xz6.png

Template:STRUCTURE 1xz6

Contents

Mutant ABO(H) blood group glycosyltransferase A

Template:ABSTRACT PUBMED 15475562

Disease

Known disease associated with this structure: Blood group, ABO system OMIM:[110300]

About this Structure

1XZ6 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structural basis for the inactivity of human blood group O2 glycosyltransferase., Lee HJ, Barry CH, Borisova SN, Seto NO, Zheng RB, Blancher A, Evans SV, Palcic MM, J Biol Chem. 2005 Jan 7;280(1):525-9. Epub 2004 Oct 8. PMID:15475562

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