Isolation, purification, and characterization of a thermostable xylanase from a novel strain, Paenibacillus campinasensis G1-1

Journal of Microbiology and Biotechnology
Hong-chen ZhengFu-ping Lu

Abstract

High levels of xylanase activity (143.98 IU/ml) produced by the newly isolated Paenibacillus campinasensis G1-1 were detected when it was cultivated in a synthetic medium. A thermostable xylanase, designated XynG1-1, from P. campinasensis G1-1 was purified to homogeneity by Octyl-Sepharose hydrophobic-interaction chromatography, Sephadex G75 gel-filter chromatography, and Q-Sepharose ion-exchange chromatography, consecutively. By multistep purification, the specific activity of XynG1-1 was up to 1,865.5 IU/mg with a 9.1-fold purification. The molecular mass of purified XynG1-1 was about 41.3 kDa as estimated by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). Sequence analysis revealed that XynG1-1 containing 377 amino acids encoded by 1,134 bp genomic sequences of P. campinasensis G1-1 shared 96% homology with XylX from Paenibacillus campinasensis BL11 and 77%~78% homology with xylanases from Bacillus sp. YA- 335 and Bacillus sp. 41M-1, respectively. The activity of XynG1-1 was stimulated by Ca2+, Ba2+, DTT, and beta- mercaptoethanol, but was inhibited by Ni2+, Fe2+, Fe3+, Zn2+, SDS, and EDTA. The purified XynG1-1 displayed a greater affinity for birchwood xylan, with an optimal temperature of 60 degrees C...Continue Reading

Citations

Oct 24, 2019·Applied Microbiology and Biotechnology· Alokika, Bijender Singh
Jun 29, 2021·Journal of Agricultural and Food Chemistry·Shi Bin YangYan He Ma

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