skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Cloning, sequencing, and expression of the gene encoding a large s-layer-associated endoxylanase from Thermoanaerobacterium sp. strain JW/SL-YS 485 in Escherichia coli

Abstract

The gene (xynA) encoding a surface-exposed, S-layer associated endoxylanase from Thermoanaerobacterium sp. strain JW/SL-YS 485 was cloned and expressed in Escherichia coli. A 3.8-kb fragment was amplified from chromosomal DNA by using primers directed against conserved sequences of endoxylanases isolated from other thermophilic bacteria. This PCR product was used as a probe in Southern hybridizations to identify a 4.6-kb EcoRi fragment containing the complete xynA gene. This fragment was cloned into E. coli, and recombinant clones expressed significant levels of xylanase activity. The purified recombinant protein had an estimated molecular mass (150 kDa), temperature maximum (80{degrees}C), pH optimum (pH 6.3), and isoelectric point (pH 4.5) that were similar to those of the endoxylanase isolated from strain JW/SL-YS 485. The entire insert was sequenced and analysis revealed a 4,044-bp open reading frame encoding a protein containing 1,348 amino acid residues (estimated molecular mass of 148 kDa).xynA was preceded by a putative promoter at -35 (TTAAT) and -10 (TATATT) and a potential ribosome binding site (AGGGAG) and was expressed constitutively in E. coli. The deduced amino acid sequence showed 38 to 96% similarity to sequences of family F {beta}-glycanases. A putative 32-amino-acid signal peptide was identified, and the C-terminal end of themore » protein contained three repeating sequences (59, 64, and 57 amino acids) that showed 46 to 68% similarity to repeating sequences at the N-terminal end of S-layer and S-layer-associated proteins from other gram-positive bacteria. These repeats could permit an interaction of the enzyme with the S-layer and tether it to the cell surface.« less

Authors:
; ;  [1]
  1. Univ. of Georgia, Athens, GA (United States); and others
Publication Date:
OSTI Identifier:
625680
Resource Type:
Journal Article
Journal Name:
Journal of Bacteriology
Additional Journal Information:
Journal Volume: 178; Journal Issue: 6; Other Information: PBD: Mar 1996
Country of Publication:
United States
Language:
English
Subject:
55 BIOLOGY AND MEDICINE, BASIC STUDIES; 09 BIOMASS FUELS; AMINO ACID SEQUENCE; BACTERIA; CLONING; ESCHERICHIA COLI; DNA; PROTEINS; XYLANASE; BIOMASS; BIODEGRADATION; PLANTS

Citation Formats

Liu, Shu-Ying, Gherardini, F C, and Wiegel, J. Cloning, sequencing, and expression of the gene encoding a large s-layer-associated endoxylanase from Thermoanaerobacterium sp. strain JW/SL-YS 485 in Escherichia coli. United States: N. p., 1996. Web.
Liu, Shu-Ying, Gherardini, F C, & Wiegel, J. Cloning, sequencing, and expression of the gene encoding a large s-layer-associated endoxylanase from Thermoanaerobacterium sp. strain JW/SL-YS 485 in Escherichia coli. United States.
Liu, Shu-Ying, Gherardini, F C, and Wiegel, J. 1996. "Cloning, sequencing, and expression of the gene encoding a large s-layer-associated endoxylanase from Thermoanaerobacterium sp. strain JW/SL-YS 485 in Escherichia coli". United States.
@article{osti_625680,
title = {Cloning, sequencing, and expression of the gene encoding a large s-layer-associated endoxylanase from Thermoanaerobacterium sp. strain JW/SL-YS 485 in Escherichia coli},
author = {Liu, Shu-Ying and Gherardini, F C and Wiegel, J},
abstractNote = {The gene (xynA) encoding a surface-exposed, S-layer associated endoxylanase from Thermoanaerobacterium sp. strain JW/SL-YS 485 was cloned and expressed in Escherichia coli. A 3.8-kb fragment was amplified from chromosomal DNA by using primers directed against conserved sequences of endoxylanases isolated from other thermophilic bacteria. This PCR product was used as a probe in Southern hybridizations to identify a 4.6-kb EcoRi fragment containing the complete xynA gene. This fragment was cloned into E. coli, and recombinant clones expressed significant levels of xylanase activity. The purified recombinant protein had an estimated molecular mass (150 kDa), temperature maximum (80{degrees}C), pH optimum (pH 6.3), and isoelectric point (pH 4.5) that were similar to those of the endoxylanase isolated from strain JW/SL-YS 485. The entire insert was sequenced and analysis revealed a 4,044-bp open reading frame encoding a protein containing 1,348 amino acid residues (estimated molecular mass of 148 kDa).xynA was preceded by a putative promoter at -35 (TTAAT) and -10 (TATATT) and a potential ribosome binding site (AGGGAG) and was expressed constitutively in E. coli. The deduced amino acid sequence showed 38 to 96% similarity to sequences of family F {beta}-glycanases. A putative 32-amino-acid signal peptide was identified, and the C-terminal end of the protein contained three repeating sequences (59, 64, and 57 amino acids) that showed 46 to 68% similarity to repeating sequences at the N-terminal end of S-layer and S-layer-associated proteins from other gram-positive bacteria. These repeats could permit an interaction of the enzyme with the S-layer and tether it to the cell surface.},
doi = {},
url = {https://www.osti.gov/biblio/625680}, journal = {Journal of Bacteriology},
number = 6,
volume = 178,
place = {United States},
year = {1996},
month = {3}
}