Document Detail


Studies on the three-dimensional behaviour of the selectin ligands Lewis(a) and sulphated Lewis(a) using NMR spectroscopy and molecular dynamics simulations.
MedLine Citation:
PMID:  8186549     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Sulphated blood group Lewis(a)/Lewis(x) (Le(a)/Le(x)) type sequences, with sulphate at the 3-position of galactose, have emerged as potent ligands for the endothelial adhesion molecule E-selectin and the leukocyte adhesion molecule L-selectin. As a first step in elucidating the molecular basis of the strong interactions with the selectins, we have performed conformational studies of the sulphated Le(a) in comparison with the non-sulphated analogue which is less strongly bound by E-selectin and not at all by L-selectin. Experimental NMR parameters [nuclear Overhauser effects (NOE) and interglycosidic 3JC,H] and theoretical values back-calculated from the minimum energy structures are in excellent agreement for both molecules. Molecular dynamics calculations for SuLe(a) depict only minor torsional fluctuations around the glycosidic linkages over the time course of the 500 ps simulations, leading to the conclusion that the conformation of SuLe(a) approximates to a single-rigid structure, as does the previously investigated Le(a) molecule. Comparison of experimentally and theoretically obtained parameters for SuLe(a) with those for the non-sulphated Le(a) molecule indicate that no detectable changes occur in the three-dimensional structure of the trisaccharide upon sulphation. Thus, the enhanced selectin binding to the sulphated Le(a) is most likely due to favourable electrostatic interactions between the charged sulphate group and corresponding charged groups on the selectin protein.
Authors:
H Kogelberg; T J Rutherford
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Glycobiology     Volume:  4     ISSN:  0959-6658     ISO Abbreviation:  Glycobiology     Publication Date:  1994 Feb 
Date Detail:
Created Date:  1994-06-23     Completed Date:  1994-06-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9104124     Medline TA:  Glycobiology     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  49-57     Citation Subset:  IM    
Affiliation:
Glycoconjugates Section, MRC Clinical Research Centre, Harrow, Middlesex, UK.
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MeSH Terms
Descriptor/Qualifier:
Carbohydrate Conformation
Carbohydrate Sequence
Cell Adhesion Molecules / metabolism*
Glycosides / chemistry
Lewis Blood-Group System / chemistry*
Ligands
Magnetic Resonance Spectroscopy
Models, Molecular
Molecular Sequence Data
Oxidation-Reduction
Sulfates
Chemical
Reg. No./Substance:
0/Cell Adhesion Molecules; 0/Glycosides; 0/Lewis Blood-Group System; 0/Ligands; 0/Sulfates

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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