Reduction of nitrates,the no donors,by hemoglobin in the presence of cysteine |
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| Authors: | L A Syrtsova A I Kotel’nikov B L Psikha E S Malkova N I Shkondina E I Gainullina |
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| Institution: | (1) Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1 prosp. Akad. Semenova, 142432 Chernogolovka, Moscow Region, Russian Federation |
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| Abstract: | Hemoglobin (Hb) reduces 3,3-bis(nitroxymethyl)oxetane (NMO) only in the presence of cysteine (Cys) via intermediate cysteine thionitrate. The kinetics of the reaction of NMO with Cys and the kinetics and mechanism of formation
of NO in the ternary system Hb-NMO-Cys were studied. The formation rate of Hb-NO in the ternary system is higher than that
of Hb-NO in the reaction of Hb only with NO
2
−
generated in the binary system NMO-Cys. The second-order rate constants of the main reaction steps in the system Hb-NMO-Cys
were estimated by simulating the kinetics of the reactions with a system of equations taking into account equilibria between
all components of the reaction mixture. Hemoglobin reduces cysteine thionitrate, the intermediate in the reaction of NMO with
Cys, to NO.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 725–731, April, 2007. |
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| Keywords: | hemoglobin trinitroglycerol thionitrate vasodilation cysteine nitrite reductase |
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