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Miranda LS, Rudd SR, Mena O, Hudspeth PE, Barboza-Corona JE, Park HW, Bideshi DK. The Perpetual Vector Mosquito Threat and Its Eco-Friendly Nemeses. BIOLOGY 2024; 13:182. [PMID: 38534451 DOI: 10.3390/biology13030182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2024] [Revised: 03/06/2024] [Accepted: 03/08/2024] [Indexed: 03/28/2024]
Abstract
Mosquitoes are the most notorious arthropod vectors of viral and parasitic diseases for which approximately half the world's population, ~4,000,000,000, is at risk. Integrated pest management programs (IPMPs) have achieved some success in mitigating the regional transmission and persistence of these diseases. However, as many vector-borne diseases remain pervasive, it is obvious that IPMP successes have not been absolute in eradicating the threat imposed by mosquitoes. Moreover, the expanding mosquito geographic ranges caused by factors related to climate change and globalization (travel, trade, and migration), and the evolution of resistance to synthetic pesticides, present ongoing challenges to reducing or eliminating the local and global burden of these diseases, especially in economically and medically disadvantaged societies. Abatement strategies include the control of vector populations with synthetic pesticides and eco-friendly technologies. These "green" technologies include SIT, IIT, RIDL, CRISPR/Cas9 gene drive, and biological control that specifically targets the aquatic larval stages of mosquitoes. Regarding the latter, the most effective continues to be the widespread use of Lysinibacillus sphaericus (Ls) and Bacillus thuringiensis subsp. israelensis (Bti). Here, we present a review of the health issues elicited by vector mosquitoes, control strategies, and lastly, focus on the biology of Ls and Bti, with an emphasis on the latter, to which no resistance has been observed in the field.
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Affiliation(s)
- Leticia Silva Miranda
- Graduate Program in Biomedical Sciences, Department of Biological Sciences, California Baptist University, Riverside, CA 92504, USA
| | - Sarah Renee Rudd
- Graduate Program in Biomedical Sciences, Department of Biological Sciences, California Baptist University, Riverside, CA 92504, USA
- Integrated Biomedical Graduate Studies, and School of Medicine, Loma Linda University, Loma Linda, CA 92350, USA
| | - Oscar Mena
- Undergraduate Program in Biomedical Sciences, Department of Biological Sciences, California Baptist University, Riverside, CA 92504, USA
| | - Piper Eden Hudspeth
- Undergraduate Program in Biomedical Sciences, Department of Biological Sciences, California Baptist University, Riverside, CA 92504, USA
| | - José E Barboza-Corona
- Departmento de Alimentos, Posgrado en Biociencias, Universidad de Guanajuato Campus Irapuato-Salamanca, Irapuato 36500, Guanajuato, Mexico
| | - Hyun-Woo Park
- Graduate Program in Biomedical Sciences, Department of Biological Sciences, California Baptist University, Riverside, CA 92504, USA
- Undergraduate Program in Biomedical Sciences, Department of Biological Sciences, California Baptist University, Riverside, CA 92504, USA
| | - Dennis Ken Bideshi
- Graduate Program in Biomedical Sciences, Department of Biological Sciences, California Baptist University, Riverside, CA 92504, USA
- Undergraduate Program in Biomedical Sciences, Department of Biological Sciences, California Baptist University, Riverside, CA 92504, USA
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Serial femtosecond crystallography on in vivo-grown crystals drives elucidation of mosquitocidal Cyt1Aa bioactivation cascade. Nat Commun 2020; 11:1153. [PMID: 32123169 PMCID: PMC7052140 DOI: 10.1038/s41467-020-14894-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Accepted: 02/08/2020] [Indexed: 11/08/2022] Open
Abstract
Cyt1Aa is the one of four crystalline protoxins produced by mosquitocidal bacterium Bacillus thuringiensis israelensis (Bti) that has been shown to delay the evolution of insect resistance in the field. Limiting our understanding of Bti efficacy and the path to improved toxicity and spectrum has been ignorance of how Cyt1Aa crystallizes in vivo and of its mechanism of toxicity. Here, we use serial femtosecond crystallography to determine the Cyt1Aa protoxin structure from sub-micron-sized crystals produced in Bti. Structures determined under various pH/redox conditions illuminate the role played by previously uncharacterized disulfide-bridge and domain-swapped interfaces from crystal formation in Bti to dissolution in the larval mosquito midgut. Biochemical, toxicological and biophysical methods enable the deconvolution of key steps in the Cyt1Aa bioactivation cascade. We additionally show that the size, shape, production yield, pH sensitivity and toxicity of Cyt1Aa crystals grown in Bti can be controlled by single atom substitution. Bacillus thuringiensis israelensis (Bti) produces the naturally-crystalline proteinaceous toxin Cyt1Aa that is toxic to mosquito larvae. Here the authors grow recombinant nanocrystals of the Cyt1Aa protoxin in vivo and use serial femtosecond crystallography to determine its structure at different redox and pH conditions and by combining their structural data with further biochemical, toxicological and biophysical analyses provide mechanistic insights into the Cyt1Aa bioactivation cascade.
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Zribi Zghal R, Frikha F, Elleuch J, Darriet F, Chandre F, Jaoua S, Tounsi S. The combinatory effect of Cyt1Aa flexibility and specificity against dipteran larvae improves the toxicity of Bacillus thuringensis kurstaki toxins. Int J Biol Macromol 2019; 123:42-49. [PMID: 30391590 DOI: 10.1016/j.ijbiomac.2018.10.226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 10/31/2018] [Accepted: 10/31/2018] [Indexed: 11/15/2022]
Abstract
Cyt1A98 is a novel cytolytic protein, from BUPM98 Bacillus thuringiensis strain, characterized by its synergistic activity with B. thuringiensis kurstaki toxins against lepidopteran larvae. In this study, we evidenced that Cyt1A98 improves the toxicity of B. thuringiensis kurstaki toxins against Aedes aegypti larvae. In fact, the strain BNS3pHTcyt1A98 exhibited a larvicidal activity of about 849-fold of that of BNS3pHTBlue against A. aegypti. The molecular and biochemical characterizations, of cyt1A98 gene and its product, were achieved. Cyt1A98 had an LC50 value of about 126.56 mg l-1 against A. aegypti larvae. Compared to Cyt1Aa of B. thuringiensis israelensis, Cyt1A98 amino acid sequence harbours three substitutions of three conserved amino acids among Cyt1Aa family members (Ser42Pro, Pro82Ala, Met188Thr). The Cyt1A98 protein structural analysis evidenced more flexibility than Cyt1Aa. According to the high fluctuation observed for the residue Pro42, the amino acid at position 42 is implicated in the flexibility property of Cyt1Aa especially for the αC and αD helices, involved in the penetration into the cell membrane. The toxicity improvement could be probably due to the higher flexibility combined with the specific affinity toward dipteran larvae. The Cyt1A/B. thuringiensis kurstaki Cry toxins model provides a potential molecular genetic strategy for an efficient bioinsecticide.
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Affiliation(s)
- Raida Zribi Zghal
- Laboratory of Biopesticides, Centre of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia.
| | - Fakher Frikha
- Department of Biology, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Jihen Elleuch
- Laboratory of Biopesticides, Centre of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Frédéric Darriet
- Institut de Recherche pour le Développement (IRD), UMR MIVEGEC (UM1-UM2-CNRS 5290-IRD 224) Maladies Infectieuses et Vecteurs, Ecologie, Génétique, Evolution et Contrôle, Laboratoire de Lutte contre les Insectes Nuisibles (LIN), Montpellier, France
| | - Fabrice Chandre
- Institut de Recherche pour le Développement (IRD), UMR MIVEGEC (UM1-UM2-CNRS 5290-IRD 224) Maladies Infectieuses et Vecteurs, Ecologie, Génétique, Evolution et Contrôle, Laboratoire de Lutte contre les Insectes Nuisibles (LIN), Montpellier, France
| | - Samir Jaoua
- Biological & Environmental Sciences Department, College of Arts and Sciences, Qatar University, Doha, Qatar
| | - Slim Tounsi
- Laboratory of Biopesticides, Centre of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
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Evidence of the Importance of the Met115 for Bacillus thuringiensis subsp. israelensis Cyt1Aa Protein Cytolytic Activity in Escherichia coli. Mol Biotechnol 2007; 38:121-7. [DOI: 10.1007/s12033-007-9015-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2007] [Accepted: 10/12/2007] [Indexed: 11/25/2022]
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Promdonkoy B, Rungrod A, Promdonkoy P, Pathaichindachote W, Krittanai C, Panyim S. Amino acid substitutions in alphaA and alphaC of Cyt2Aa2 alter hemolytic activity and mosquito-larvicidal specificity. J Biotechnol 2007; 133:287-93. [PMID: 18054404 DOI: 10.1016/j.jbiotec.2007.10.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2007] [Revised: 10/05/2007] [Accepted: 10/13/2007] [Indexed: 11/18/2022]
Abstract
Cyt2Aa2 produced by Bacillus thuringiensis subsp. darmstadiensis exhibits in vitro cytolytic activity against broad range of cells but shows specific in vivo toxicity against larvae of Dipteran insects. To investigate the role of amino acids in alphaA and alphaC of this toxin, 3 single-point mutants (A61C, S108C and V109A) were generated. All 3 mutant proteins were highly produced as inclusion bodies that could be solubilized and activated by proteinase K similar to that of the wild type. Hemolytic activity of A61C and S108C mutants was significantly reduced whereas the V109A mutant showed comparable hemolytic activity to the wild type. Interestingly, the A61C mutant exhibited high larvicidal activity to both Aedes aegypti and Culex quinquefasciatus. S108C and V109A mutants showed low activity against C. quinquefasciatus but relatively high toxicity to A. aegypti. These results demonstrated for the first time that amino acids in alphaA and alphaC are involved in the selectivity of the Cyt toxin to the targeted organism.
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Affiliation(s)
- Boonhiang Promdonkoy
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Phahonyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand.
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Promdonkoy B, Pathaichindachote W, Krittanai C, Audtho M, Chewawiwat N, Panyim S. Trp132, Trp154, and Trp157 are essential for folding and activity of a Cyt toxin from Bacillus thuringiensis. Biochem Biophys Res Commun 2004; 317:744-8. [PMID: 15081403 DOI: 10.1016/j.bbrc.2004.03.102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2004] [Indexed: 10/26/2022]
Abstract
Cyt2Aa2 is a cytolytic and mosquito larvicidal toxin produced by Bacillus thuringiensis subsp. darmstadiensis. The toxin contains 3 tryptophan residues at positions 132, 154, and 157. To study the role of tryptophan on protein structure and functions, each tryptophan residue was substituted by phenylalanine and other different amino acids. Expression test in Escherichia coli showed that all mutant proteins were highly produced as inclusion bodies similar to that of the wild type. The mutant W157F showed haemolytic and mosquito larvicidal activities comparable to the wild type but the mutant W157V and all other mutants at positions 132 and 154 have completely lost these activities. Solubilization and proteinase K activation tests indicated that aromatic residue is required at position 157 and tryptophan residues at positions 132 and 154 are critical residues playing important role to maintain structure and functions of the protein and cannot be changed to any other amino acid.
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Affiliation(s)
- Boonhiang Promdonkoy
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, 113 Paholyothin Road, Klong 1, Klong Luang, Pathumthani 12120, Thailand.
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Manasherob R, Zaritsky A, Metzler Y, Ben-Dov E, Itsko M, Fishov I. Compaction of the Escherichia coli nucleoid caused by Cyt1Aa. MICROBIOLOGY-SGM 2004; 149:3553-3564. [PMID: 14663087 DOI: 10.1099/mic.0.26271-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Compaction of the Escherichia coli nucleoid in the cell's centre was associated with the loss of colony-forming ability; these effects were caused by induction of Cyt1Aa, the cytotoxic 27 kDa protein from Bacillus thuringiensis subsp. israelensis. Cyt1Aa-affected compaction of the nucleoids was delayed but eventually more intense than compaction caused by chloramphenicol. The possibility that small, compact nucleoids in Cyt1Aa-expressing cells resulted in DNA replication run-out and segregation following cell division was ruled out by measuring relative nucleoid length. Treatments with membrane-perforating substances other than Cyt1Aa did not cause such compaction of the nucleoids, but rather the nucleoids overexpanded to occupy nearly all of the cell volume. These findings support the suggestion that, in addition to its perforating ability, Cyt1Aa causes specific disruption of nucleoid associations with the cytoplasmic membrane. In situ immunofluorescence labelling with Alexa did not demonstrate a great amount of Cyt1Aa associated with the membrane. Clear separation between Alexa-labelled Cyt1Aa and 4',6-diamidino-2-phenylindole (DAPI)-stained DNA indicates that the nucleoid does not bind Cyt1Aa. Around 2 h after induction, nucleoids in Cyt1Aa-expressing cells started to decompact and expanded to fill the whole cell volume, most likely due to partial cell lysis without massive peptidoglycan destruction.
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Affiliation(s)
- Robert Manasherob
- Department of Life Sciences, Ben-Gurion University of the Negev, PO Box 653, Be'er-Sheva 84105, Israel
| | - Arieh Zaritsky
- Department of Life Sciences, Ben-Gurion University of the Negev, PO Box 653, Be'er-Sheva 84105, Israel
| | - Yifah Metzler
- Department of Life Sciences, Ben-Gurion University of the Negev, PO Box 653, Be'er-Sheva 84105, Israel
| | - Eitan Ben-Dov
- Department of Life Sciences, Ben-Gurion University of the Negev, PO Box 653, Be'er-Sheva 84105, Israel
| | - Mark Itsko
- Department of Life Sciences, Ben-Gurion University of the Negev, PO Box 653, Be'er-Sheva 84105, Israel
| | - Itzhak Fishov
- Department of Life Sciences, Ben-Gurion University of the Negev, PO Box 653, Be'er-Sheva 84105, Israel
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Knowles BH, White PJ, Nicholls CN, Ellar DJ. A broad-spectrum cytolytic toxin fromBacillus thuringiensisvar.kyushuensis. Proc Biol Sci 1997; 248:1-7. [PMID: 1355907 DOI: 10.1098/rspb.1992.0035] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Bacillus thuringiensis (Bt) var. kyushuensis synthesizes a mosquitocidal crystalline inclusion containing several proteins ranging from 140 to 14 kDa. We have identified a 25 kDa protein protoxin in this inclusion which is not cytolytic, but when activated proteolytically to 23-22 kDa products is cytolytic to mosquito, lepidopteran and mammalian cells, can release entrapped glucose from liposomes and forms cation-selective channels in a planar lipid bilayer. This broad-spectrum cytolytic toxin is related antigenically to the 23 kDa toxin from Bt var. darmstadiensis strain 73-E10-2, but not to the 25 kDa CytA toxin of Bt var. israelensis. The cytolytic activity of these Bt var. kyushuensis toxins, like that of the latter two toxins, can be neutralized by incubation with liposomes containing phospholipids.
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Affiliation(s)
- B H Knowles
- Department of Zoology, University of Cambridge, U.K
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Affiliation(s)
- F A Drobniewski
- Public Health Laboratory Service, Dulwich Hospital, East Dulwich Grove, London, UK
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Drobniewski FA, Ellar DJ. Purification and properties of a 28-kilodalton hemolytic and mosquitocidal protein toxin of Bacillus thuringiensis subsp. darmstadiensis 73-E10-2. J Bacteriol 1989; 171:3060-7. [PMID: 2566594 PMCID: PMC210015 DOI: 10.1128/jb.171.6.3060-3067.1989] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The mosquitocidal crystal of Bacillus thuringiensis subsp. darmstadiensis 73-E10-2 was purified, bioassayed against third-instar Aedes aegypti larvae (50% lethal concentration, 7.5 micrograms/ml), and subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis, revealing polypeptides of 125, 50, 47, and 28 kilodaltons (kDa). When solubilized and proteolytically activated by insect gut proteases or proteinase K, the crystal was cytotoxic to insect and mammalian cells in vitro and was hemolytic. By using nondenaturing polyacrylamide gel electrophoresis, a polypeptide of 23 kDa, derived from the 28-kDa protoxin, was identified which was hemolytic and cytotoxic to Aedes albopictus, A. aegypti, and Choristoneura fumiferana CF1 insect cell lines. The 23-kDa polypeptide was purified by ion-exchange chromatography and gave 50% lethal dose values of 3.8, 3.3, and 6.9 micrograms/ml against A. albopictus, A. aegypti, and C. fumiferana CF1 cells lines, respectively. Cytotoxicity in vitro was both dose and temperature dependent, with a sigmoidal dose-response curve. The cytotoxicity of the 23-kDa toxin and the solubilized and proteolytically activated delta-endotoxin was inhibited by a range of phospholipids containing unsaturated fatty acids and by triglyceride and diglyceride dispersions. An interaction with membrane phospholipids appears important for toxicity. Polyclonal antisera prepared against the 23-kDa polypeptide did not cross-react with polypeptides in the native crystals of four other mosquitocidal strains.
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Affiliation(s)
- F A Drobniewski
- Department of Biochemistry, University of Cambridge, United Kingdom
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Abstract
Immunotoxins consist of monoclonal or polyclonal antibodies conjugated to bacterial or plant toxins. The toxins used are typically of the A-B type in which a toxic A chain is coupled to a B chain responsible for cell binding and facilitation of A chain entry into the cytosol. Two broad strategies have been followed: coupling intact toxins, or A chains alone, to antibodies. This review examines current progress in in vitro and in vivo research, including recent clinical studies, concentrating principally on ricin or ricin A chain conjugates. The future role of conjugates using membrane-acting toxins, immunolysins, is also discussed.
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Affiliation(s)
- F A Drobniewski
- St Bartholomew's Hospital Medical College, Charterhouse Square, London
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Knowles BH, Blatt MR, Tester M, Horsnell JM, Carroll J, Menestrina G, Ellar DJ. A cytolytic delta-endotoxin from Bacillus thuringiensis var. israelensis forms cation-selective channels in planar lipid bilayers. FEBS Lett 1989; 244:259-62. [PMID: 2465921 DOI: 10.1016/0014-5793(89)80540-x] [Citation(s) in RCA: 94] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In order to determine the mechanism of action of the 27 kDa mosquitocidal delta-endotoxin of Bacillus thuringiensis var. israelensis we have studied its effects on the conductance of planar lipid bilayers. The toxin formed cation-selective channels in the bilayers, permeable to K+ and Na+ but not to N-methylglucamine or Cl-, showing very fast, cooperative opening and closing. Channel opening was greatly reduced in the presence of divalent cations (Ca2+, Mg2+) and the effect was reversed when these ions were removed. These results are consistent with our proposal that B. thuringiensis toxins act by a mechanism of colloid-osmotic lysis.
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Affiliation(s)
- B H Knowles
- Department of Biochemistry, University of Cambridge, England
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Insect Cell Cultures as Tools in the Study of Bacterial Protein Toxins. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/b978-0-12-007907-0.50010-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Brousseau R, Masson L. Bacillus thuringiensis insecticidal crystal toxins: Gene structure and mode of action. Biotechnol Adv 1988; 6:697-724. [PMID: 14550036 DOI: 10.1016/0734-9750(88)91920-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thanks to the techniques of recombinant DNA, there is now abundant sequence information on several endotoxin genes of Bacillus thuringiensis. The task of correlating this sequence information with the economically important aspects of the toxins such as insect specificity, LD(50) and speed of kill is now under worldwide investigation. Progress has also been made on understanding the mechanism of action of the toxins and on identifying the parts of the protoxin which are important in toxicity. Taken together, the mechanistic data and the sequence information allow the first attempts at rational design of mutant endotoxin genes and greatly facilitate the transfer of those genes to other organisms such as plants. More information is still needed, however, as to the nature of the binding site of the toxin and on the three-dimensional structure of the activated toxins.
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Affiliation(s)
- R Brousseau
- Biotechnology Research Institute, Montreal, Quebec, Canada
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