Download MendeleyDeciphering the structural and biochemical aspects of xylosidase from Pseudopedobacter saltans.
Vishwakarma, P., Sachdeva, E., Thakur, A., Ethayathulla, A.S., Goyal, A., Kaur, P.(2024) Int J Biol Macromol 291: 139042-139042
- PubMed: 39708861
- DOI: https://doi.org/10.1016/j.ijbiomac.2024.139042
- Primary Citation of Related Structures:
8HCJ - PubMed Abstract:
Xylose, a key constituent of the heterogeneous hemicellulose polymer, occurs in lignocellulosic biomass and forms xylan polymers through β-1,4 glycosidic linkages. The β-1,4-xylosidase enzyme was isolated from Pseudopedobacter saltans (PsGH43) to find an effective enzyme with enhanced activity to depolymerize xylo-oligosaccharides. β-1,4-xylosidase belongs to the GH43 1 family as classified in the Carbohydrate-Active Enzyme Database (CAZy). PsGH43 2 was found to be active only on xylose-based substrate, 4NPX 3 , with maximum activity occurring at a pH 7 and 30 °C (K m 1.96 ± 0.2 mM and V max 0.43 mM/min). The study also confirms the influence of Ca 2+ ions on enzymatic activity and thermal stability. Subsequently, native PsGH43 was crystallized at optimum conditions and the structure was determined at 2.5 Å resolution. Crystallographic analysis revealed an asymmetric unit containing eight monomers and 16 calcium ions wherein a tetramer constituted the functional unit. Each monomer exhibits a characteristic GH43 N-terminal β-propeller fold that serves as a catalytic domain accommodating one calcium ion in the centre, while the C-terminal β-sandwich fold associated with the CBM6 4 family preserves another calcium ion. Our study reveals a novel tetrameric arrangement of β-1,4-xylosidase which unravels its functional indispensability. This study opens newer avenues to engineer a potential enzyme for biofuel and bioethanol industry.
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110029, India.
Organizational Affiliation:
