Abstract
Improvement of the activity and insecticidal spectrum of cloned Cry toxins of Bacillus thuringiensis should allow for their wider application as biopesticides and a gene source for gene-modified crops. The insecticidal activity of Cry toxins depends on their binding to the receptor. Therefore, as a model, we aimed to generate improved binding affinity mutant toxins against Bombyx mori cadherin-like receptor (BtR175) using methods of directed evolution with the expectation of insecticidal activity improved mutants. Four serial amino acid residues of 439QAAG442 or 443AVYT446 of Cry1Aa were replaced with random amino acids and were displayed on the T7 phage for library construction. Through five cycles of panning of the phage libraries using BtR175, 11 mutant phage clones were concentrated, and mutant toxin sequences were confirmed. The binding affinities of the three mutants were 42-, 15-, and 13-fold higher than that of the wild type, indicating that mutants with improved binding affinity to cadherin can be easily selected from randomly replaced loop 3 mutant libraries using directed evolution. We discuss the development of a genetic engineering method based on directed evolution to improve the binding affinity of Cry toxin to receptors.
Similar content being viewed by others
Abbreviations
- BtR:
-
Cadherin-like receptor
- BtR175-TBR:
-
Toxin-binding region of BtR175
- APN:
-
Aminopeptidase N
- ALP:
-
Alkaline phosphatase
- ABCC2:
-
ABC transporter C2
References
Crickmore, N. (2006). Beyond the spore—past and future developments of Bacillus thuringiensis as a biopesticide. Journal of Applied Microbiology, 101, 616–619.
Romeis, J., Meissle, M., & Bigler, F. (2006). Transgenic crops expressing Bacillus thuringiensis toxins and biological control. Nature Biotechnology, 24, 63–71.
Bravo, A., Likitvivatanavong, S., Gill, S. S., & Soberon, M. (2011). Bacillus thuringiensis: a story of a successful bioinsecticide. Insect Biochemistry and Molecular Biology, 41, 423–431.
Zhang, X., Candas, M., Griko, N. B., Taussig, R., & Bulla, L. A. (2006). A mechanism of cell death involving an adenylyl cyclase/PKA signaling pathway is induced by the Cry1Ab toxin of Bacillus thuringiensis. Proceedings of the National Academy of Sciences of the United States of America, 103, 9897–9902.
Gahan, L. J., Gould, F., & Heckel, D. G. (2001). Identification of a gene associated with Bt resistance in Heliothis virescens. Science, 293, 857–860.
Morin, S., Biggs, R. W., Sisterson, M. S., Shriver, L., Ellers-Kirk, C., Higginson, D., et al. (2003). Three cadherin alleles associated with resistance to Bacillus thuringiensis in pink bollworm. Proceedings of the National Academy of Sciences of the United States of America, 100, 5004–5009.
Xu, X., Yu, L., & Wu, Y. (2005). Disruption of a cadherin gene associated with resistance to Cry1Ac delta -endotoxin of Bacillus thuringiensis in Helicoverpa armigera. Applied and Environmental Microbiology, 71, 948–954.
Yang, Y., Chen, H., Wu, Y., Yang, Y., & Wu, S. (2007). Mutated cadherin alleles from a field population of Helicoverpa armigera confer resistance to Bacillus thuringiensis toxin Cry1Ac. Applied and Environmental Microbiology, 73, 6939–6944.
Nagamatu, Y., Koike, T., Sasaki, K., Yoshimoto, A., & Furukawa, Y. (1999). The cadherin-like protein is essential to specificity determination and cytotoxic action of the Bacillus thuringiensis insecticidal Cry1Aa toxin. FEBS Letters, 460, 385–390.
Tsuda, Y., Nakatani, F., Hashimoto, K., Ikawa, S., Matsuura, C., Fukada, T., et al. (2003). Cytotoxic activity of Bacillus thuringiensis Cry proteins on mammalian cells transfected with cadherin-like Cry receptor gene of Bombyx mori (silkworm). The Biochemical Journal, 369, 697–703.
Hua, G., Jurat-Fuentes, J. L., & Adang, M. J. (2004). Fluorescent-based assays establish Manduca sexta Bt-R(1a) cadherin as a receptor for multiple Bacillus thuringiensis Cry1A toxins in Drosophila S2 cells. Insect Biochemistry and Molecular Biology, 34, 193–202.
Zhang, X., Candas, M., Griko, N. B., Rose-Young, L., & Bulla, L. A. (2005). Cytotoxicity of Bacillus thuringiensis Cry1Ab toxin depends on specific binding of the toxin to the cadherin receptor BT-R1 expressed in insect cells. Cell Death and Differentiation, 12, 1407–1416.
Soberon, M., Pardo-Lopez, L., Lopez, I., Gomez, I., Tabashnik, B. E., & Bravo, A. (2007). Engineering modified Bt toxins to counter insect resistance. Science, 318, 1640–1642.
Tabashnik, B. E., Huang, F., Ghimire, M. N., Leonard, B. R., Siegfried, B. D., Rangasamy, M., et al. (2011). Efficacy of genetically modified Bt toxins against insects with different genetic mechanisms of resistance. Nature Biotechnology, 29, 1128–1131.
Gahan, L. J., Pauchet, Y., Vogel, H., & Heckel, D. G. (2010). An ABC transporter mutation is correlated with insect resistance to Bacillus thuringiensis Cry1Ac toxin. PLoS Genetics, 6, e1001248.
Baxter, S. W., Badenes-perez, F. R., Morrison, A., Vogel, H., Crickmore, N., Kain, W., et al. (2011). Parallel evolution of Bt toxin resistance in Lepidoptera. Genetics, 189, 675–679.
Atsumi, S., Miyamoto, K., Yamamoto, K., Narukawa, J., Kawai, S., Sezutsu, H., et al. (2012). Single amino acid mutation in an ATP-binding cassette transporter gene causes resistance to Bt toxin Cry1Ab in the silkworm, Bombyx mori. Proceedings of the National Academy of Sciences of the United States of America, 109, E1591–E1598.
Li, J. D., Carroll, J., & Ellar, D. J. (1991). Crystal structure of insecticidal delta-endotoxin from Bacillus thuringiensis at 2.5 Å resolution. Nature, 353, 815–821.
Grochulski, P., Masson, L., Borisova, S., Pusztai-Carey, M., Schwartz, J. L., Brousseau, R., et al. (1995). Bacillus thuringiensis Cry1A(a) insecticidal toxin: crystal structure and channel formation. Journal of Molecular Biology, 254, 447–464.
Galitsky, N., Cody, V., Wojtczak, A., Ghosh, D., Luft, J. R., Pangborn, W., et al. (2001). Structure of the insecticidal bacterial delta-endotoxin Cry3Bb1 of Bacillus thuringiensis. Acta Crystallographica Section D, Biological Crystallography, 57, 1101–1109.
Morse, R. J., Yamamoto, T., & Stroud, R. M. (2001). Structure of Cry2Aa suggests an unexpected receptor binding epitope. Structure, 9, 409–417.
Boonserm, P., Davis, P., Ellar, D. J., & Li, J. (2005). Crystal structure of the mosquito-larvicidal toxin Cry4Ba and its biological implications. Journal of Molecular Biology, 348, 363–382.
Boonserm, P., Mo, M., Angsuthanasombat, C., & Lescar, J. (2006). Structure of the functional from of the mosquito larvicidal Cry4Aa toxin from Bacillus thuringiensis at a 2.8-angstorm resolution. Journal of Bacteriology, 188, 3391–3401.
Guo, S., Ye, S., Liu, Y., Wei, L., Xue, J., Wu, H., et al. (2009). Crystal structure of Bacillus thuringiensis Cry8Ea1: an insecticidal toxin toxic to underground pests, the larvae of Holotrichia parallela. Journal of Structural Biology, 168, 259–266.
Gomez, I., Dean, D. H., Bravo, A., & Soberon, M. (2003). Molecular basis for Bacillus thuringiensis Cry1Ab toxin specificity: two structural determinants in the Manduca sexta Bt-R1 receptor interact with loops alpha-8 and 2 in domain II of Cry1Aa toxin. Biochemistry, 42, 10482–10489.
Wu, S. J., & Dean, D. H. (1996). Functional significance of loops in the receptor binding domain of Bacillus thuringiensis CryIIIA delta-endotoxin. Journal of Molecular Biology, 255, 628–640.
Gomez, I., Oltean, D. I., Gill, S. S., Bravo, A., & Soberon, M. (2001). Mapping the epitope in cadherin-like receptor involved in Bacillus thuringiensis Cry1A toxin interaction using phage display. The Journal of Biological Chemistry, 276, 28906–28912.
Xie, R., Zhuang, M., Ross, L. S., Gomez, I., Oltean, D. I., Bravo, A., et al. (2005). Single amino acid mutations in the cadherin receptor from Heliothis virescens affect its toxin binding ability to Cry1A toxins. The Journal of Biological Chemistry, 280, 8416–8425.
Sharma, P., Nain, V., Lakhanpaul, S., & Kumar, P. A. (2011). Binding of Bacillus thuringiensis Cry1A toxins with brush border membrane vesicles of maize stem borer (Chilo partellus Swinhoe). Journal of Invertebrate Pathology, 106, 333–335.
Dorsch, J. A., Candas, M., Griko, N. B., Maaty, W. S., Midboe, E. G., Vadlamudi, R. K., et al. (2002). Cry1A toxins of Bacillus thuringiensis bind specifically to a region adjacent to the membrane-proximal extracellular domain of BT-R(1) in Manduca sexta: involvement of a cadherin in the entomopathogenicity of Bacillus thuringiensis. Insect Biochemistry and Molecular Biology, 32, 1025–1036.
Marks, J. D., Marks, J. D., Griffiths, A. D., Malmqvist, M., Clackson, T. P., Bye, J. M., et al. (1992). By-passing immunization: building high affinity human antibodies by chain shuffling. Bio/Technology, 10, 779–783.
Barbas, C. F, 3rd, Hu, D., Dunlop, N., Sawyer, L., Cababa, D., Hendry, R. M., et al. (1994). In vitro evolution of a neutralizing human antibody to human immunodeficiency virus type 1 to enhance affinity and broaden strain cross-reactivity. Proceedings of the National Academy of Sciences of the United States of America, 91, 3809–3813.
Marzari, R., Edomi, P., Bhatnagar, R. K., Ahmad, S., Selvapandiyan, A., & Bradbury, A. (1997). Phage display of Bacillus thuringiensis CryIA(a) insecticidal toxin. FEBS Letters, 411, 27–31.
Kasman, L. M., Lukowiak, A. A., Garczynski, S. F., Mcnall, R. J., Youngman, P., & Adang, M. J. (1998). Phage display of a biologically active Bacillus thuringiensis toxin phage display of a biologically active Bacillus thuringiensis Toxin. Applied and Environmental Microbiology, 64, 2995–3003.
Vilchez, S., Jacoby, J., & Ellar, D. J. (2004). Display of biologically functional insecticidal toxin on the surface of lambda phage. Applied and Environmental Microbiology, 70, 6587–6594.
Pacheco, S., Gomez, I., Sato, R., Bravo, A., & Soberon, M. (2006). Functional display of Bacillus thuringiensis Cry1Ac toxin on T7 phage. Journal of Invertebrate Pathology, 92, 45–49.
Craveiro, K. I., Gomes Junior, J. E., Silva, M. C., Macedo, L. L., Lucena, W. A., Silva, M. S., et al. (2010). Variant Cry1Ia toxins generated by DNA shuffling are active against sugarcane giant borer. Journal of Biotechnology, 145, 215–221.
Oliveira, G. R., Silva, M. C., Lucena, W. A., Nakasu, E. Y., Firmino, A. A., Beneventi, M. A., et al. (2011). Improving Cry8Ka toxin activity towards the cotton boll weevil (Anthonomus grandis). BMC Biotechnology, 11, 85.
Ishikawa, H., Hoshino, Y., Motoki, Y., Kawahara, T., Kitajima, M., Kitami, M., et al. (2007). A system for the directed evolution of the insecticidal protein from Bacillus thuringiensis. Molecular Biotechnology, 36, 90–101.
Obata, F., Kitami, M., Inoue, Y., Atsumi, S., Yoshizawa, Y., & Sato, R. (2009). Analysis of the region for receptor binding and triggering of oligomerization on Bacillus thuringiensis Cry1Aa toxin. FEBS Journal, 276, 5949–5959.
Hara, H., Atsumi, S., Yaoi, K., Nakanishi, K., Higurashi, S., Miura, N., et al. (2003). A cadherin-like protein functions as a receptor for Bacillus thuringiensis Cry1Aa and Cry1Ac toxins on midgut epithelial cells of Bombyx mori larvae. FEBS Letters, 538, 29–34.
Hawkins, R. E., Russell, S. J., & Winter, G. (1992). Selection of phage antibodies by binding affinity. Mimicking affinity maturation. Journal of Molecular Biology, 226, 889–896.
Schier, R., Bye, J., Apell, G., McCall, A., Adams, G. P., Malmqvist, M., et al. (1996). Isolation of high-affinity monomeric human anti-c-erbB-2 single chain Fv using affinity-driven selection. Journal of Molecular Biology, 255, 28–43.
Schier, R., McCall, A., Adams, G. P., Marshall, K. W., Merritt, H., Yim, M., et al. (1996). Isolation of picomolar affinity anti-c-erbB-2 single-chain Fv by molecular evolution of the complementarity determining regions in the center of the antibody binding site. Journal of Molecular Biology, 263, 551–567.
Thompson, J., Pope, T., Tung, J. S., Chan, C., Hollis, G., Mark, G., et al. (1996). Affinity maturation of a high-affinity human monoclonal antibody against the third hypervariable loop of human immunodeficiency virus: use of phage display to improve affinity and broaden strain reactivity. Journal of Molecular Biology, 256, 77–88.
Gomez, I., Arenas, I., Benitez, I., Miranda-Rios, J., Becerril, B., Grande, R., et al. (2006). Specific epitopes of domains II and III of Bacillus thuringiensis Cry1Ab toxin involved in the sequential interaction with cadherin and aminopeptidase-N receptors in Manduca sexta. The Journal of Biological Chemistry, 281, 34032–34039.
Yaoi, K., Kadotani, T., Kuwana, H., Shinkawa, A., Takahashi, T., Iwahana, H., et al. (1997). Aminopeptidase N from Bombyx mori as a candidate for the receptor of Bacillus thuringiensis Cry1Aa toxin. European Journal of Biochemistry, 246, 652–657.
Yaoi, K., Nakanishi, K., Kadotani, T., Imamura, M., Koizumi, N., Iwahara, H., et al. (1999). Bacillus thuringiensis Cry1Aa toxin-binding region of Bombyx mori aminopeputidase N. FEBS Letters, 463, 221–224.
Jurat-Fuentes, J. L., & Adang, M. J. (2004). Characterization of a Cry1Ac-receptor alkaline phosphatase in susceptible and resistant Heliothis virescens larvae. European Journal of Biochemistry, 271, 3127–3135.
Hossain, D. M., Shitomi, Y., Moriyama, K., Higuchi, M., Hayakawa, T., Mitsui, T., et al. (2004). Characterization of a novel plasma membrane protein, expressed in the midgut epithelia of Bombyx mori, that binds to Cry1A toxins. Applied and Environmental Microbiology, 70, 4604–4612.
Pacheco, S., Gomez, I., Arenas, I., Saab-Rincon, G., Rodriguez-Almazan, C., Gill, S. S., et al. (2009). Domain II loop3 of Bacillus thuringiensis Cry1Ab toxin is involved in a “ping pong” binding mechanism with Manduca sexta aminopeptidase-N and cadherin receptors. The Journal of Biological Chemistry, 284, 32750–32757.
Atsumi, S., Mizuno, E., Hara, H., Nakanishi, K., Kitami, M., Miura, N., et al. (2005). Location of the Bombyx mori Aminopeptidase N Type 1 Binding Site on Bacillus thuringiensis Cry1Aa Toxin. Applied and Environmental Microbiology, 71, 3966–3977.
Burton, S. L., Ellar, D. J., Li, J., & Derbyshire, D. J. (1999). N-acetylgalactosamine on the putative insect receptor aminopeptidase N is recognised by a site on the domain III lectin-like fold of a Bacillus thuringiensis insecticidal toxin. Journal of Molecular Biology, 287, 1011–1022.
de Maagd, R. A., Bakker, P. L., Masson, L., Adang, M. J., Sangadala, S., Stiekema, W., et al. (1999). Domain III of the Bacillus thuringiensis delta-endotoxin Cry1Ac is involved in binding to Manduca sexta brush border membranes and to its purified aminopeptidase N. Molecular Microbiology, 31, 463–471.
Jenkins, J. L., Lee, M. K., Sangadala, S., Adang, M. J., & Dean, D. H. (1999). Binding of Bacillus thuringiensis Cry1Ac toxin to Manduca sexta aminopeptidase-N receptor is not directly related to toxicity. FEBS Letters, 462, 373–376.
Kitami, M., Kadotani, T., Nakanishi, K., Atsumi, S., Higurashi, S., Ishizaka, T., et al. (2011). Bacillus thuringiensis Cry Toxins Bound Specifically to Various Proteins via Domain III, Which Had a Galactose-Binding Domain-Like Fold. Bioscience, Biotechnology, and Biochemistry, 75, 305–312.
Wolfersberger, M. G. (1990). The toxicity of two Bacillus thuringiensis delta-endotoxins to gypsy moth larvae is inversely related to the affinity of binding sites on midgut brush border membranes for the toxins. Experientia, 46, 475–477.
Liang, Y., Patel, S. S., & Dean, D. H. (1995). Irreversible binding kinetics of Bacillus thuringiensis CryIA delta-endotoxins to gypsy moth brush border membrane vesicles is directly correlated to toxicity. The Journal of Biological Chemistry, 270, 24719–24724.
Tanaka, S., Miyamoto, K., Noda, H., Jurat-Fuentes, J. L., Yoshizawa, Y., Endo, H., & Sato, R. ABC transporter C2 functions both independently and cooperatively with cadherin-like protein as a receptor for Cry toxins (submitted).
Acknowledgments
This research was supported financially by a Grant-in-Aid for Scientific Research (B) (24310054) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Fujii, Y., Tanaka, S., Otsuki, M. et al. Affinity Maturation of Cry1Aa Toxin to the Bombyx mori Cadherin-Like Receptor by Directed Evolution. Mol Biotechnol 54, 888–899 (2013). https://doi.org/10.1007/s12033-012-9638-0
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12033-012-9638-0