Abstract
Here, we report results of spectrophotometric, spectrofluorimetric, and ultrafiltration studies on the reaction between cobinamides (viz. aquahydroxo-, nitro-, aquacyano- and dicyanocobinamides; Cbi) and bovine serum albumin (BSA), and reactivity of formed complexes toward cyanide. (H2O)(HO−)Cbi binds BSA at almost equimolar ratio predominantly via amino group of lysine side chains. The mechanism of the reaction involves two steps, i.e. the coordination of amino group on Co(III), and further stabilization of the generated complex. The reaction of (H2O)(NO2−)Cbi with BSA is similar with that involving (H2O)(HO−)Cbi, and both complexes bind cyanide significantly slower than free (H2O)(HO−)Cbi and (H2O)(NO2−)Cbi. (H2O)(CN−)Cbi binds BSA predominantly via aminogroup as well, however, its coordination proceeds substantially faster and less tightly than in the case of (H2O)(HO−)Cbi. Binding of (H2O)(CN−)Cbi and (H2O)(HO−)Cbi occurs at different sites of BSA as was indicated by spectrofluorimetric titration. Reaction of the complex between (H2O)(CN−)Cbi and BSA with cyanide proceeds much faster than in the case of the complex between (H2O)(HO−)Cbi and BSA. (CN−)2Cbi is partially decyanated by BSA, however, its binding by BSA is relatively low.
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Funding
This work was supported by the Russian Science Foundation (Project No. 21-73-10057, https://rscf.ru/project/21-73-10057/) to IAD. The study was carried out using the resources of the Center for Shared Use of Scientific Equipment of the ISUCT (with the support of the Ministry of Science and Higher Education of Russia, Grant No. 075-15-2021-671).
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Dereven’kov, I.A., Osokin, V.S., Molodtsov, P.A. et al. Effect of complexation between cobinamides and bovine serum albumin on their reactivity toward cyanide. Reac Kinet Mech Cat 135, 1469–1483 (2022). https://doi.org/10.1007/s11144-022-02216-8
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DOI: https://doi.org/10.1007/s11144-022-02216-8