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Structure of the Lysinibacillus sphaericus Tpp49Aa1 pesticidal protein elucidated from natural crystals using MHz-SFX

Williamson, Lainey J., Galchenkova, Marina, Best, Hannah L., Bean, Richard J., Munke, Anna, Awel, Salah, Pena, Gisel, Knoska, Juraj, Schubert, Robin, Dörner, Katerina, Park, Hyun-Woo, Bideshi, Dennis K., Henkel, Alessandra, Kremling, Viviane, Klopprogge, Bjarne, Lloyd-Evans, Emyr ORCID:, Young, Mark T. ORCID:, Valerio, Joana, Kloos, Marco, Sikorski, Marcin, Mills, Grant, Bielecki, Johan, Kirkwood, Henry, Kim, Chan, de Wijn, Raphael, Lorenzen, Kristina, Xavier, Paul Lourdu, Rahmani Mashhour, Aida, Gelisio, Luca, Yefanov, Oleksandr, Mancuso, Adrian P., Federici, Brian A., Chapman, Henry N., Crickmore, Neil, Rizkallah, Pierre J. ORCID:, Berry, Colin ORCID: and Oberthür, Dominik 2023. Structure of the Lysinibacillus sphaericus Tpp49Aa1 pesticidal protein elucidated from natural crystals using MHz-SFX. Proceedings of the National Academy of Sciences 120 (49) , e2203241120. 10.1073/pnas.2203241120

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The Lysinibacillus sphaericus proteins Tpp49Aa1 and Cry48Aa1 can together act as a toxin toward the mosquito Culex quinquefasciatus and have potential use in biocontrol. Given that proteins with sequence homology to the individual proteins can have activity alone against other insect species, the structure of Tpp49Aa1 was solved in order to understand this protein more fully and inform the design of improved biopesticides. Tpp49Aa1 is naturally expressed as a crystalline inclusion within the host bacterium, and MHz serial femtosecond crystallography using the novel nanofocus option at an X-ray free electron laser allowed rapid and high-quality data collection to determine the structure of Tpp49Aa1 at 1.62 Å resolution. This revealed the packing of Tpp49Aa1 within these natural nanocrystals as a homodimer with a large intermolecular interface. Complementary experiments conducted at varied pH also enabled investigation of the early structural events leading up to the dissolution of natural Tpp49Aa1 crystals—a crucial step in its mechanism of action. To better understand the cooperation between the two proteins, assays were performed on a range of different mosquito cell lines using both individual proteins and mixtures of the two. Finally, bioassays demonstrated Tpp49Aa1/Cry48Aa1 susceptibility of Anopheles stephensi, Aedes albopictus, and Culex tarsalis larvae—substantially increasing the potential use of this binary toxin in mosquito control.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: National Academy of Sciences
ISSN: 0027-8424
Funders: BBSRC
Date of First Compliant Deposit: 4 December 2023
Date of Acceptance: 18 October 2023
Last Modified: 03 Jan 2024 14:52

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