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FEBS Lett. 2010 Sep 24;584(18):3962-8. doi: 10.1016/j.febslet.2010.08.001. Epub 2010 Aug 6.

Molecular characterization of β1,4-galactosyltransferase 7 genetic mutations linked to the progeroid form of Ehlers-Danlos syndrome (EDS).

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  • 1UMR 7561 CNRS-Université de Nancy I, Faculté de Médecine, Vandoeuvre-lès-Nancy, France.


β1,4-Galactosyltransferase 7 (β4GalT7) is a key enzyme initiating glycosaminoglycan (GAG) synthesis. Based on in vitro and ex vivo kinetics studies and structure-based modelling, we molecularly characterized β4GalT7 mutants linked to the progeroid form of Ehlers-Danlos syndrome (EDS), a severe connective tissue disorder. Our results revealed that loss of activity upon L206P substitution due to altered protein folding is the primary cause for the GAG synthesis defect in patients carrying the compound A186D and L206P mutations. We showed that R270C substitution strongly reduced β4GalT7 affinity towards xyloside acceptor, thus affecting GAG chains formation. This study establishes the molecular basis for β4GalT7 defects associated with altered GAG synthesis in EDS.

Copyright © 2010 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

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