Structural basis of product inhibition by arabinose and xylose of the thermostable GH43 beta-1,4-xylosidase from Geobacillus thermoleovorans IT-08.Rohman, A., van Oosterwijk, N., Puspaningsih, N.N.T., Dijkstra, B.W.
(2018) PLoS ONE 13: e0196358-e0196358
- PubMed: 29698436
- DOI: 10.1371/journal.pone.0196358
- Primary Citation of Related Structures:
- PubMed Abstract:
- Purification, crystallization and preliminary X-ray analysis of a thermostable glycoside hydrolase family 43 beta-xylosidase from Geobacillus thermoleovorans IT-08.
Rohman, A.,van Oosterwijk, N.,Kralj, S.,Dijkhuizen, L.,Dijkstra, B.W.,Puspaningsih, N.N.
(2007) Acta Crystallogr. Sect. F Struct. Biol. Cryst. Commun. 63: 932
Complete degradation of the xylan backbone of hemicellulosic plant cell walls requires the synergistic action of endo-xylanases and β-1,4-xylosidases. While endo-xylanases produce xylooligosaccharides from xylan, β-1,4-xylosidases degrade the xylooli ...
Complete degradation of the xylan backbone of hemicellulosic plant cell walls requires the synergistic action of endo-xylanases and β-1,4-xylosidases. While endo-xylanases produce xylooligosaccharides from xylan, β-1,4-xylosidases degrade the xylooligosaccharides into xylose monomers. The glycoside hydrolase family 43 β-1,4-xylosidase from Geobacillus thermoleovorans IT-08 is a promising, heat stable catalyst for the saccharification of hemicellulosic material into simple fermentable sugars, but it is competitively inhibited by its products arabinose and xylose. As a first step to help overcome this problem, we elucidated crystal structures of the enzyme in the unliganded form and with bound products, at 1.7-2.0 Å resolution. The structures are very similar to those of other enzymes belonging to glycoside hydrolase family 43. Unexpectedly, the monosaccharides are bound in very different ways. Arabinose preferentially binds in subsite -1, while xylose exclusively interacts with subsite +1. These structures and sugar binding preferences suggest ways for improving the catalytic performance of the enzyme by rational mutational design.
Department of Chemistry, Faculty of Sciences and Technology, Universitas Airlangga, Surabaya, Indonesia.,Institute of Tropical Disease, Universitas Airlangga, Surabaya, Indonesia.,Laboratory of Biophysical Chemistry, University of Groningen, Groningen, The Netherlands.