Abstract
The gene, AbfAC26Sari, encoding an α-l-arabinofuranosidase from Anoxybacillus kestanbolensis AC26Sari, was isolated, cloned, sequenced, and characterizated. On the basis of amino acid sequence similarities, this 57-kDa enzyme could be assigned to family 51 of the glycosyl hydrolase classification system. Characterization of the purified recombinant α-l-arabinofuranosidase produced in Escherichia coli BL21 revealed that it is active at a broad pH range (pH 4.5 to 9.0) and at a broad temperature range (45–85°C) and it has an optimum pH of 5.5 and an optimum temperature of 65°C. Kinetic experiment at 65°C with p-nitrophenyl α-l-arabinofuranoside as a substrate gave a V max and K m values of 1,019 U/mg and 0.139 mM, respectively. The enzyme had no apparent requirement of metal ions for activity, and its activity was strongly inhibited by 1 mM Cu2+ and Hg2+. The recombinant arabinofuranosidase released l-arabinose from arabinan, arabinoxylan, oat spelt xylan, arabinobiose, arabinotriose, arabinotetraose, and arabinopentaose. Endoarabinanase activity was not detected. These findings suggest that AbfAC26Sari is an exo-acting enzyme.
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Acknowledgments
We are grateful to The Scientific and Research Council of Turkey (TUBITAK, Grant no. 104T286) and Karadeniz Technical University Research Foundation (grant no. 2007.111.04.10) for financial support.
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Canakci, S., Kacagan, M., Inan, K. et al. Cloning, purification, and characterization of a thermostable α-l-arabinofuranosidase from Anoxybacillus kestanbolensis AC26Sari. Appl Microbiol Biotechnol 81, 61–68 (2008). https://doi.org/10.1007/s00253-008-1584-1
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DOI: https://doi.org/10.1007/s00253-008-1584-1