Download MendeleyCrystal structure of semi-synthetic obelin-v after calcium induced bioluminescence implies coelenteramine as the main reaction product.
Natashin, P.V., Eremeeva, E.V., Shevtsov, M.B., Kovaleva, M.I., Bukhdruker, S.S., Dmitrieva, D.A., Gulnov, D.V., Nemtseva, E.V., Gordeliy, V.I., Mishin, A.V., Borshchevskiy, V.I., Vysotski, E.S.(2022) Sci Rep 12: 19613-19613
- PubMed: 36379962
- DOI: https://doi.org/10.1038/s41598-022-24117-5
- Primary Citation of Related Structures:
8A9S - PubMed Abstract:
Coelenterazine-v (CTZ-v), a synthetic vinylene-bridged π-extended derivative, is able to significantly alter bioluminescence spectra of different CTZ-dependent luciferases and photoproteins by shifting them towards longer wavelengths. However, Ca 2+ -regulated photoproteins activated with CTZ-v display very low bioluminescence activities that hampers its usage as a substrate of photoprotein bioluminescence. Here, we report the crystal structure of semi-synthetic Ca 2+ -discharged obelin-v bound with the reaction product determined at 2.1 Å resolution. Comparison of the crystal structure of Ca 2+ -discharged obelin-v with those of other obelins before and after bioluminescence reaction reveals no considerable changes in the overall structure. However, the drastic changes in CTZ-binding cavity are observed owing to the completely different reaction product, coelenteramine-v (CTM-v). Since CTM-v is certainly the main product of obelin-v bioluminescence and is considered to be a product of the "dark" pathway of dioxetanone intermediate decomposition, it explains the low bioluminescence activity of obelin and apparently of other photoproteins with CTZ-v.
Organizational Affiliation:
Photobiology Laboratory, Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia.
