title: Cloning, sequence analysis, and expression of a gene encoding an endoxylanase from Bacillus halodurans S7.
abstract: The gene encoding an alkaline active xylanase of Bacillus halodurans S7, containing an open reading frame of 1188 nucleotides encoding 396 amino acids, was cloned and expressed in Escherchia coli. On the basis of sequence similarity, possible -10 and -35, ribosome binding, and transcription terminator regions were identified. Analysis of the deduced amino acid sequence revealed that the protein was a single domain enzyme belonging to family 10 and designated as xyn10A. The calculated molecular mass and isoelectric point (pI) of the mature peptide were 42.6 and 4.5 kDa, respectively. Xylanase activity expressed by the recombinant organism was detected in the cytoplasm, periplasm and the extracellular medium. In an 18-h old culture, about 39% of the xylanase was detected in the medium. The stability and activity profile of the recombinant xylanase was similar to the properties of the enzyme produced by the wild-type organism.
authors.affiliation: Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, Lund, Sweden.
authors.forename: Gashaw
authors.initials: G
authors.lastname: Mamo
authors.forename: Osvaldo
authors.initials: O
authors.lastname: Delgado
authors.forename: Alejandra
authors.initials: A
authors.lastname: Martinez
authors.forename: Bo
authors.initials: B
authors.lastname: Mattiasson
authors.forename: Rajni
authors.initials: R
authors.lastname: Hatti-Kaul
mesh_terms: D000595:Amino Acid Sequence; D001407:Bacillus / Q000166:cytology / Q000201:enzymology* / Q000235:genetics; D049109:Cell Proliferation; D003001:Cloning, Molecular; D017124:Conserved Sequence; D004591:Electrophoresis, Polyacrylamide Gel; D043364:Endo-1,4-beta Xylanases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D004795:Enzyme Stability; D004926:Escherichia coli; D015964:Gene Expression Regulation, Bacterial; D015971:Gene Expression Regulation, Enzymologic; D006863:Hydrogen-Ion Concentration; D008969:Molecular Sequence Data; D021381:Protein Transport; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013696:Temperature
chemical_list: D011994:Recombinant Proteins; D043364:Endo-1,4-beta Xylanases