Addition of proteinase K during the culture alter the physiology of Bacillus thuringiensis culture and the cry1Ac, nprX, nprA, and spo0A gene transcription

Bacillus thuringiensis is the major bioinsecticide worldwide produced due to the Cry protein activity. Several studies have been done to improve the cost–productivity relation. The neutral protease A (NprA) is the major extracellular protein massively produced during the stationary phase by this bac...

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Bibliographic Details
Published in:Antonie van Leeuwenhoek 2022, Vol.115 (1), p.89-102
Main Authors: Peña-Rico, Miguel A., Bravo-D, Humberto R., Roldan-Sabino, Crisanto, Castro-Cerritos, Karla V., Huerta-Heredia, Ariana, Navarro-Mtz, A. Karin
Format: Article
Language:English
Subjects:
Bacilli
Bacillus thuringiensis
Bacillus thuringiensis - genetics
Bacterial Proteins - genetics
Biodegradation
Biomedical and Life Sciences
CRY protein
Cry1Ac toxin
Culture media
Endopeptidase K
Endotoxins - genetics
Gene expression
Genes
Hemolysin Proteins - genetics
Life Sciences
Medical Microbiology
Microbiology
Original Paper
Plant Sciences
Protease
Proteinase
Proteins
Soil Science & Conservation
Spo0A gene
Stationary phase
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Summary:Bacillus thuringiensis is the major bioinsecticide worldwide produced due to the Cry protein activity. Several studies have been done to improve the cost–productivity relation. The neutral protease A (NprA) is the major extracellular protein massively produced during the stationary phase by this bacterium, contributing to the Cry proteins' degradation. Also, the deletion of aprA and nprA genes enhanced the yield of Cry protein, stabilizing it. Therefore, to increase Cry production, one possibility is to degrade the NprA protease in the culture media. In the present study, proteinase K was used to hydrolyze the NprA to increase Cry production. Proteinase K was added during the exponential growth of B. thuringiensis culture. The bacilli and endospores were measured along all culture, while the Cry protein was measured at the end of the culture. The addition of PK affects the bacilli and spore kinetics positively but negatively to the Cry protein (there is no Cry protein detection). Therefore, the gene expression of the cry1Ac, nprX , nprA, and spo0A was measured. The expression of each gene was followed along all culture. Results demonstrated that PK alters both the transcriptional levels and the expression order of the genes.
ISSN:0003-6072
1572-9699
DOI:10.1007/s10482-021-01683-8