Crystal structure of semi-synthetic obelin-v after calcium induced bioluminescence implies coelenteramine as the main reaction product

Autor: Pavel V. Natashin, Elena V. Eremeeva, Mikhail B. Shevtsov, Margarita I. Kovaleva, Sergey S. Bukhdruker, Daria A. Dmitrieva, Dmitry V. Gulnov, Elena V. Nemtseva, Valentin I. Gordeliy, Alexey V. Mishin, Valentin I. Borshchevskiy, Eugene S. Vysotski
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Scientific Reports, Vol 12, Iss 1, Pp 1-14 (2022)
Druh dokumentu: article
ISSN: 2045-2322
DOI: 10.1038/s41598-022-24117-5
Popis: 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, Ca2+-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 Ca2+-discharged obelin-v bound with the reaction product determined at 2.1 Å resolution. Comparison of the crystal structure of Ca2+-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.
Databáze: Directory of Open Access Journals
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