Abstract
The functional screening of cDNA libraries (or functional cloning) enables isolation of cDNA genes encoding novel proteins with unknown amino acid sequences. This approach is the only way to identify a protein sequence in the event of shortage of biological material for obtaining pure target protein in amounts sufficient to determine its primary structure, since sensitive functional test for a target protein is only required to successfully perform functional cloning. Commonly, bioluminescent proteins from representatives belonging to different taxa significantly differ in sequences due to independent origin of bioluminescent systems during evolution. Nonetheless, these proteins are frequently similar in functions and can use even the same substrate of bioluminescence reaction, allowing the use of the same functional test for screening. The cDNA genes encoding unknown light-emitting proteins can be identified during functional screening with high sensitivity, which is provided by modern light recording equipment making possible the detection of a very small amount of a target protein. Here, we present the protocols for isolation of full-size cDNA genes for the novel bioluminescent protein family of light-sensitive Ca2+-regulated photoproteins in the absence of any sequence information by functional screening of plasmid cDNA expression library. The protocols describe all the steps from gathering animals to isolation of individual E. coli colonies carrying full-size cDNA genes using photoprotein berovin from ctenophore Beroe abyssicola as an illustrative example.
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Acknowledgments
This work was partially funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project No. 20-44-242003 and the Ministry of Science and Higher Education of the Russian Federation (project No. 0287-2021-0020).
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Markova, S.V., Vysotski, E.S. (2024). Functional Screening of cDNA Expression Library for Novel Ctenophore Photoproteins. In: Moroz, L.L. (eds) Ctenophores. Methods in Molecular Biology, vol 2757. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3642-8_13
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DOI: https://doi.org/10.1007/978-1-0716-3642-8_13
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