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- W2474895235 abstract "Bacillus sp. CSB39, isolated from popular traditional Korean food (Kimchi), produced a low molecular weight, thermostable mannanase (MnCSB39); 571.14 U/mL using locust bean gum galactomannan as a major substrate. It was purified to homogeneity using a simple and effective two-step purification strategy, Sepharose CL-6B and DEAE Sepharose Fast Flow, which resulted in 25.47% yield and 19.32-fold purity. The surfactant-, NaCl-, urea-, and protease-tolerant monomeric protein had a mass of ∼30 kDa as analyzed by SDS-PAGE and galactomannan zymography. MnCSB39 was found to have optimal activity at pH 7.5 and temperature of 70 °C. The enzyme showed ˃55% activity at 5.0–15% (w/v) NaCl, and ˃93% of the initial activity after incubation at 37 °C for 60 min. Trypsin and proteinase K had no effect on MnCBS39. The enzyme showed ˃80% activity in up to 3 M urea. The N-terminal amino acid sequence, ALKGDGX, did not show identity with reported mannanases, which suggests the novelty of our enzyme. Activation energy for galactomannan hydrolysis was 26.85 kJmol−1 with a Kcat of 142.58 × 104 s−1. MnCSB39 had Km and Vmax values of 0.082 mg/mL and 1099 ± 1.0 Umg−1, respectively. Thermodynamic parameters such as ΔH, ΔG, ΔS, Q10, ΔGE-S, and ΔGE-T supported the spontaneous formation of products and the high hydrolytic efficiency and feasibility of the enzymatic reaction, which strengthen its novelty. MnCSB39 activity was affected by metal ions, modulators, chelators, and detergents. Mannobiose was the principal end-product of hydrolysis. Bacillus subtilis CSB39 produced a maximum of 1524.44 U mannanase from solid state fermentation of 1 g wheat bran. MnCSB39 was simple to purify, was active at a wide pH and temperature range, multi-stress tolerant and catalyzes a thermodynamically possible reaction, characteristics that suggests its suitability for application as an industrial biocatalyst." @default.
- W2474895235 created "2016-07-22" @default.
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- W2474895235 date "2016-10-01" @default.
- W2474895235 modified "2023-10-16" @default.
- W2474895235 title "A multi-tolerant low molecular weight mannanase from Bacillus sp. CSB39 and its compatibility as an industrial biocatalyst" @default.
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- W2474895235 doi "https://doi.org/10.1016/j.enzmictec.2016.06.018" @default.
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