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| | {{STRUCTURE_2i7b| PDB=2i7b | SCENE= }} | | {{STRUCTURE_2i7b| PDB=2i7b | SCENE= }} |
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| - | '''Structure of the naturally occuring mutant of human ABO(H) Blood group B glycosyltransferase: GTB/A268T'''
| + | ===Structure of the naturally occuring mutant of human ABO(H) Blood group B glycosyltransferase: GTB/A268T=== |
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| - | ==Overview==
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| - | BACKGROUND: Four amino-acid-changing polymorphisms differentiate the blood group A and B alleles. Multiple missense mutations are associated with weak expression of A and B antigens but the structural changes causing subgroups have not been studied. STUDY DESIGN AND METHODS: Individuals or families having serologically weak B antigen on their red cells were studied. Alleles were characterized by sequencing of exons 1 through 7 in the ABO gene. Single crystal X-ray diffraction, three-dimensional-structure molecular modeling, and enzyme kinetics showed the effects of the B allele mutations on the glycosyltransferases. RESULTS: Seven unrelated individuals with weak B phenotypes possessed seven different B alleles, five of which are new and result in substitution of highly conserved amino acids: M189V, I192T, F216I, D262N, and A268T. One of these (F216I) was due to a hybrid allele resulting from recombination between B and O(1v) alleles. The two other alleles were recently described in other ethnic groups and result in V175M and L232P. The first crystal-structure determination (A268T) of a subgroup glycosyltransferase and molecular modeling (F216I, D262N, L232P) indicated conformational changes in the enzyme that could explain the diminished enzyme activity. The effect of three mutations could not be visualized since they occur in a disordered loop. CONCLUSION: The genetic background for B(w) phenotypes is very heterogeneous but usually arises through seemingly random missense mutations throughout the last ABO exon. The targeted amino acid residues, however, are well conserved during evolution. Based on analysis of the resulting structural changes in the glycosyltransferase, the mutations are likely to disrupt molecular bonds of importance for enzymatic function.
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| | ==Disease== | | ==Disease== |
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| | [[Category: Hybrid allele]] | | [[Category: Hybrid allele]] |
| | [[Category: Polymorphism]] | | [[Category: Polymorphism]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 07:10:17 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 08:56:51 2008'' |
Revision as of 05:56, 28 July 2008
Template:STRUCTURE 2i7b
Structure of the naturally occuring mutant of human ABO(H) Blood group B glycosyltransferase: GTB/A268T
Template:ABSTRACT PUBMED 17465952
Disease
Known disease associated with this structure: Blood group, ABO system OMIM:[110300]
About this Structure
2I7B is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structural basis for red cell phenotypic changes in newly identified, naturally occurring subgroup mutants of the human blood group B glycosyltransferase., Hosseini-Maaf B, Letts JA, Persson M, Smart E, LePennec PY, Hustinx H, Zhao Z, Palcic MM, Evans SV, Chester MA, Olsson ML, Transfusion. 2007 May;47(5):864-75. PMID:17465952
Page seeded by OCA on Mon Jul 28 08:56:51 2008
