Applied Biochemistry and Biotechnology

, Volume 170, Issue 1, pp 119–130 | Cite as

Thermostable and Alkalistable Endoxylanase of the Extremely Thermophilic Bacterium Geobacillus thermodenitrificans TSAA1: Cloning, Expression, Characteristics and Its Applicability in Generating Xylooligosaccharides and Fermentable Sugars

Article

Abstract

Xylanase encoding gene (1,224 bp) from Geobacillus thermodenitrificans was cloned in pET28a (+) vector and successfully expressed in Escherichia coli BL21 (DE3). The deduced amino acid sequence analysis revealed homology with that of glycosyl hydrolase (GH) 10 family with a high molecular mass (50 kDa). The purified recombinant xylanase is optimally active at pH 9.0 and 70 °C with T1/2 of 10 min at 80 °C, and retains greater than 85 % activity after exposure to 70 °C for 180 min. The enzyme liberates xylose as well as xylooligosaccharides from birchwood xylan and agro-residues, and therefore, this is an endoxylanase. The xylan hydrolytic products (xylooligosaccharides, xylose, and xylobiose) find application as prebiotics and in the production of bioethanol. The xylanase being thermostable and alkalistable, it has released chromophores and phenolics from the residual lignin of pulps, suggesting its utility in mitigating chlorine requirement in pulp bleaching.

Keywords

Geobacillus thermodenitrificans Thermo-alkalistable xylanase Pulp pre-bleaching Xylooligosaccharides Prebiotics 

Supplementary material

12010_2013_174_MOESM1_ESM.doc (40 kb)
Supplementary Fig. 1Nucleotide and deduced amino acid sequences of the G. thermodenitrificans xylanase gene. The underlined regions I (I V A E N V M K), II (R F H T L V W H), III (D V V N E), IV (L Y I N D Y N), V (I G H Q S H I), VI (I T E L D V), VII (T F W G I A D N H T W), and VIII (D Y I K V A F Q T A) denote highly conserved GH10 xylanases. Glu187, Asp230, and Glu293 are crucial catalytic residues. (DOC 40 kb)
12010_2013_174_MOESM2_ESM.doc (237 kb)
Supplementary Fig. 2Secondary structure of rXyl-gtd was proposed using ESPript 2.2 software. The structure is based on the available template of xylanase from 1HIZ chain A of G. stearothermophilus. Symbols α, β, and TT denote the helix, sheets, and turns, respectively. (DOC 237 kb)
12010_2013_174_MOESM3_ESM.doc (644 kb)
Supplementary Fig.3Electrophoretic analysis of the rXyl-gtd using 15 % SDS-PAGE. a Purified rXyl-gtd of 50 kDa; M, standard protein markers; lanes 1 and 2 show eluted proteins with 200 and 250 mM imidazole; b zymogram analysis of purified rXyl-gtd using Congo red. (DOC 644 kb)

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Digvijay Verma
    • 1
  • Ashima Anand
    • 1
  • T. Satyanarayana
    • 1
  1. 1.Department of MicrobiologyUniversity of Delhi South CampusNew DelhiIndia

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