Generation of chitin‐derived oligosaccharides toxic to pathogenic bacteria using ChiA74, an endochitinase native to Bacillus thuringiensis |
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Authors: | T. Ortiz‐Rodríguez N. De La Fuente‐Salcido D.K. Bideshi R. Salcedo‐Hernández J.E. Barboza‐Corona |
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Affiliation: | 1. Universidad de Guanajuato Campus Irapuato‐Salamanca, División Ciencias de la Vida, Departamento de Ingeniería en Alimentos, Irapuato, Guanajuato, México;2. Universidad Autónoma de Nayarit, Unidad Académica de Ciencias Químico Biológicas y Farmacéuticas, Tepic Nayarit, México;3. Universidad Autónoma de Coahuila, Escuela de Ciencias Biológicas. Torreón, Coahuila, México;4. Department of Natural and Mathematical Sciences, California Baptist University, Riverside, California;5. Department of Entomology, University of California, Riverside, California |
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Abstract: | Aims: To demonstrate that an endochitinase (ChiA74) native to Bacillus thuringiensis can be used to generate chitin‐derived oligosaccharides (OGS) with antibacterial activity against a number of aetiological agents of disease, including bacteria that cause diarrhoeal and emetic syndromes in humans. Methods and Results: The intact chiA74 with its cis elements was cloned into high and moderately high copy number Escherichia coli expression vectors. Functionally secreted ChiA74 was produced, and the endochitinase cleaved substrate colloidal chitin to produce OGS with 3, 5 and 6 degrees of polymerization. The enzyme was active for an extended period of incubation (24 h), but its activity showed a decrement of 73% and 87%, respectively, after 24 h of incubation at 37 and 55°C. OGS showed inhibitory activity against Bacillus cereus, Listeria inoccua, E. coli, Staphylococcus xylosus, Salmonella species, Staphylococcus aureus, Pseudomona aeruginosa, Shigella flexneri, and Proteus vulgaris. Conclusions: Endochitinase ChiA74 is able to stably maintain hydrolytic activity during prolonged incubation in a mix reaction with chitin to produce bioactive OGS with inhibitory activity against important food‐borne pathogenic bacteria. Significance and Impact of the Study: This is the first study showing that an endochitinase (ChiA74) native of the most important bioinsecticide used worldwide (B. thuringiensis), but here produced in E. coli, is able to generate chitin‐derived OGS with antibacterial activity against clinically significant food‐borne pathogenic bacteria. |
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Keywords: | Bacillus thuringiensis chitin‐oligosaccharides endochitinase ChiA74 |
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