Comparative Potential of Chitinase and Chitosanase from the Strain Bacillus thuringiensis B-387 for the Production of Antifungal Chitosan Oligomers.

IF 2.7 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
BioTech Pub Date : 2025-05-08 DOI:10.3390/biotech14020035
Gleb Aktuganov, Alexander Lobov, Nailya Galimzianova, Elena Gilvanova, Lyudmila Kuzmina, Polina Milman, Alena Ryabova, Alexander Melentiev, Sergey Chetverikov, Sergey Starikov, Sergey Lopatin
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引用次数: 0

Abstract

The depolymerization of chitosan using chitinolytic enzymes is one of the most promising approaches for the production of bioactive soluble chitooligosaccharides (COS) due to its high specificity, environmental safety, mild reaction conditions, and potential for development. However, the comparative efficacy of bacterial chitinases and chitosanases in terms of yield, solubility, and antimicrobial activity of produced COS remains understudied. In this work, chitinase (73 kDa) and chitosanase (40 kDa) from the strain Bacillus thuringiensis B-387 (Bt-387) were purified using various chromatographic techniques and compared by their action on chitosan (DD 85%). The molecular mass and structure of generated COS was determined using TLC, LC-ESI-MS, HP-SEC, and C13-NMR techniques. Chitosanase converted the polymer more rapidly to short COS (GlcN2-GlcN4), than chitinase, and was more specific in its action on mixed bonds between GlcN and GlcNAc. Chitosanase needed a noticeably shorter incubation time and enzyme-substrate ratio than chitinase for production of larger oligomeric molecules (Mw 2.4-66.5 and 15.4-77.7 kDa, respectively) during controlled depolymerization of chitosan. Moreover, chitosanase-generated oligomers demonstrate better solubility and a higher antifungal activity in vitro against the tested plant pathogenic fungi. These features, as well as the high enzyme production and its simplified purification protocol, make chitosanase B-387 more suitable for the production of antifungal chitooligomers than chitinase.

苏云金芽孢杆菌B-387几丁质酶和壳聚糖酶生产抗真菌壳聚糖低聚物的比较潜力。
几丁质水解酶解聚壳聚糖具有特异性高、环境安全、反应条件温和、开发潜力大等优点,是制备具有生物活性的水溶性壳寡糖的重要途径之一。然而,细菌几丁质酶和壳聚糖酶在产率、溶解度和抗菌活性方面的比较效果仍未得到充分研究。采用不同的色谱技术纯化了苏云金芽孢杆菌B-387 (Bt-387)的几丁质酶(73 kDa)和几丁质酶(40 kDa),并比较了它们对壳聚糖(DD 85%)的作用。采用TLC、LC-ESI-MS、HP-SEC和C13-NMR等技术测定产物的分子量和结构。壳聚糖酶比几丁质酶更快地将聚合物转化为短COS (GlcN2-GlcN4),并且对GlcN和GlcNAc之间的混合键的作用更特异性。壳聚糖酶在控制解聚过程中产生较大的低聚分子(分子量分别为2.4-66.5和15.4-77.7 kDa)所需的孵育时间和酶底物比明显比几丁质酶短。此外,壳聚糖酶生成的低聚物在体外对所测试的植物病原真菌具有更好的溶解性和更高的抗真菌活性。壳聚糖酶B-387比几丁质酶更适合生产抗真菌的壳寡聚物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
BioTech
BioTech Immunology and Microbiology-Applied Microbiology and Biotechnology
CiteScore
3.70
自引率
0.00%
发文量
51
审稿时长
11 weeks
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