Contributions of 5'-UTR and 3'-UTR cis elements to Cyt1Aa synthesis in Bacillus thuringiensis subsp. israelensis
| Autor: | Hyun-Woo Park, Yuko Sakano, Dennis K. Bideshi, Brian A. Federici, Baoxue Ge |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Five prime untranslated region 030106 microbiology Bacillus thuringiensis Bacillus subtilis medicine.disease_cause Article law.invention 03 medical and health sciences Hemolysin Proteins Bacterial Proteins Transcription (biology) law medicine Promoter Regions Genetic 3' Untranslated Regions Ecology Evolution Behavior and Systematics biology Bacillus thuringiensis Toxins Toxin Parasporal body Promoter biology.organism_classification Molecular biology Endotoxins 030104 developmental biology Recombinant DNA 5' Untranslated Regions |
| Zdroj: | Journal of invertebrate pathology. 149 |
| ISSN: | 1096-0805 |
| Popis: | The biopesticide used most effectively to control mosquito and blackfly vectors of human diseases worldwide is Bacillus thuringiensis subsp. israelensis. The high efficacy of this bacterium is due to synergistic interactions among four protein entomotoxins assembled individually into a single parasporal body (PB) during sporulation. Cyt1Aa, the primary synergist, is the most abundant toxin, comprising approximately 55% of the PB’s mass. The other proteins are Cry11Aa at ∼35%, and Cry4Aa and Cry4Ba, which together account for the remaining ∼10%. The molecular genetic basis for the comparatively large amount of Cyt1Aa synthesized is unknown. Here, in addition to the known strong BtI (σE) and BtII (σK) promoters, we demonstrate a third promoter (BtIII) that has high identity to the σE promoter of Bacillus subtilis, contributes to the large amount of Cyt1Aa synthesized. We also show that a cyt1Aa-BtIII construct was not functional in a σE-deficient strain of B. subtilis. Comparison of transcription levels and protein profiles for recombinant strains containing different combinations of BtI, BtII and BtIII, or each promoter alone, showed that BtIII is active throughout sporulation. We further demonstrate that a stable stem-loop in the 3′-untranslated region (3′-UTR, predicted ΔG = −27.6) contributes to the high level of Cyt1Aa synthesized. |
| Databáze: | OpenAIRE |
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