Oligosaccharide binding in family 8 glycosidases: Crystal structures of active-site mutants of the beta-1,4-xylanase pXyl from Pseudoaltermonas haloplanktis TAH3a in complex with substrate and product
[en] The structures of inactive mutants D144A and E78Q of the glycoside hydrolase family 8 (GH-8) endo-beta-1,4-D-Xylanase (pXyl) from the Antarctic bacterium Pseudoalteromonas haloplanktis TAH3a in complex with its substrate xylopentaose (at 1.95 angstrom resolution) and product xylotriose (at 1.9 angstrom resolution) have been determined by X-ray crystallography. A detailed comparative analysis of these with the apoenzyme and with other GH-8 structures indicates an induced fit mechanism upon ligand binding whereby a number of conformational changes and, in particular, a repositioning of the proton donor into a more catalytically competent position Occurs. This has also allowed for the description of protein-ligand interactions in this enzyme and for the demarcation of subsites -3 to +3. An in-depth analysis of each of these subsites gives an insight into the structure-function relationship of this enzyme and the basis of xylose/glucose discrimination in family 8 glycoside hydrolases. Furthermore, the structure of the -1/+1 subsite spanning complex reveals that the substrate is distorted from its ground state conformation. Indeed, structural analysis and in silico docking Studies indicate that substrate hydrolysis in GH-8 members is preceded by a conformational change, away from the substrate ground-state chair conformation, to a pretransition state local minimum S-2(O) conformation.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
De Vos, D.
Collins, T.
Nerinckx, W.
Savvides, S. N.
Claeyssens, M.
Gerday, Charles ; Université de Liège - ULiège > Services généraux (Faculté des sciences) > Relations académiques et scientifiques (Sciences)
Feller, Georges ; Université de Liège - ULiège > Département des sciences de la vie > Labo de biochimie
Van Beeumen, J.
Language :
English
Title :
Oligosaccharide binding in family 8 glycosidases: Crystal structures of active-site mutants of the beta-1,4-xylanase pXyl from Pseudoaltermonas haloplanktis TAH3a in complex with substrate and product
Publication date :
18 April 2006
Journal title :
Biochemistry
ISSN :
0006-2960
eISSN :
1520-4995
Publisher :
Amer Chemical Soc, Washington, United States - Washington
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