Abstract
A bacterium (strain HC1) capable of assimilating rice bran hemicellulose was isolated from a soil and identified as belonging to the genus Paenibacillus through taxonomical and 16S rDNA sequence analysis. Strain HC1 cells grown on rice bran hemicellulose as a sole carbon source inducibly produced extracellular xylanase and intracellular glycosidases such as β-d-glucosidase and β-d-arabinosidase. One of them, β-d-glucosidase was further analyzed. A genomic DNA library of the bacterium was constructed in Escherichia coli and gene coding for β-d-glucosidase was cloned by screening for β-d-glucoside-degrading phenotype in E. coli cells. Nucleotide sequence determination indicated that the gene for the enzyme contained an open reading frame consisting of 1,347 bp coding for a polypeptide with a molecular mass of 51.4 kDa. The polypeptide exhibits significant homology with other bacterial β-d-glucosidases and belongs to glycoside hydrolase family 1. β-d-Glucosidase purified from E. coli cells was a monomeric enzyme with a molecular mass of 50 kDa most active at around pH 7.0 and 37°C. Strain HC1 glycosidases responsible for degradation of rice bran hemicellulose are expected to be useful for structurally determining and molecularly modifying rice bran hemicellulose and its derivatives.
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Abbreviations
- RB:
-
Rice bran
- TLC:
-
Thin-layer chromatography
- X-Glc:
-
5-Bromo-4-chrolo-3-indoryl-β-d-glucopyranoside
- p-NP:
-
p-nitrophenyl
- HPLC:
-
High-performance liquid chromatography
- KPB:
-
Potassium phosphate buffer
- SDS-PAGE:
-
Sodium dodecyl sulfate-polyacrylamide gel electrophoresis
- aa:
-
Amino acids
- acc no:
-
Accession number
- bglA :
-
Strain HC1 β-d-glucosidase gene
- BglA:
-
Strain HC1 β-d-glucosidase
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Acknowledgements
This work was supported in part by Grants-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology of Japan to K.M. and W.H. and by the Program of Basic Research Activities for Innovative Biosciences (PROBRAIN) of Japan to K.M. A part of this work was also supported by the Iijima foundation of Japan.
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Harada, K.M., Tanaka, K., Fukuda, Y. et al. Degradation of rice bran hemicellulose by Paenibacillus sp. strain HC1: gene cloning, characterization and function of β-D-glucosidase as an enzyme involved in degradation. Arch Microbiol 184, 215–224 (2005). https://doi.org/10.1007/s00203-005-0038-8
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DOI: https://doi.org/10.1007/s00203-005-0038-8