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M. B. Wamalwa, G. Zhao, M. Sakka, M. P. Shiundu, T. Kimura and K. Sakka, “High Level Heterologous Expression of Bacillus halodurans Putative Xylanase xyn11A (BHO899) in Kluyveromyces lactis,” Bioscience, Biotechnology and Biochemistry, Vol. 71, No. 3, 2007, pp. 688-693.

has been cited by the following article:

• TITLE: Purification and Characterization of Alkaline Xylanase Secreted from Paenibacillus macquariensis

  AUTHORS: Meeta Sharma, Saurabh Mehta, Anil Kumar

  KEYWORDS: Xylanase; Paenibacillus macquariensis; Purification; Michaelis Constant; Sodium Dodecyl Sulfate Polyacrylamide Gel Electrophoresis

  JOURNAL NAME: Advances in Microbiology, Vol.3 No.1, March 27, 2013

  ABSTRACT: An alkaline xylanase secreted by Paenibacillus macquariensis RC 1819 has been purified using ammonium sulfate fractionation, ion exchange chromatography using DEAE-cellulose and gel filtration chromatography over Sephadex G-200 and Sephadex G-100. The purified enzyme had the specific activity, 25.2 units/mg protein with birchwood xylan as a substrate. The purified enzyme showed a single protein band over sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The molecular weight of the enzyme has been found to be 31,000 ± 2000 as determined by using Sephadex G-200 gel filtration chromatography. The subunit molecular weight has also been found to be ~31,000 as determined using SDS-PAGE indicating monomeric enzyme. The enzyme showed optimum activity at pH 8.6 and temperature, 50°C. The Michaelis constant (Km) of the enzyme for birchwood xylan was 2.2 mg/ml as determined using velocity saturation plot. The metal ions viz. Co+2 and Mn+2 stimulated xylanase enzyme activity whereas Hg+2 inhibited the enzyme activity.