What question did this study set out to answer?

June 1, 1992Journal of Biological ChemistryOpen Access

Ca2+/calmodulin-dependent cytochrome c reductase activity of brain nitric oxide synthase.

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Population

Purified brain nitric oxide synthase

Design

Preclinical

Authors

PKPeter KlattUniversidad Complutense de Madrid BHBurghard HeinzelUniversity of Graz MJMaliyakal E. JohnCentral Sheep and Wool Research Institute

Discussion

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Implication

Findings remain preclinical; leaves open whether brain NOS contributes to cellular electron transfer in cardiovascular contexts.

Key Points

This research aims to elucidate the cytochrome c reductase activity of brain nitric oxide synthase and its dependence on calcium/calmodulin.
Purified brain nitric oxide synthase was analyzed for its interaction with cytochrome c-agarose.
The cyclic activity of nitric oxide synthase was assessed using various electron acceptors, including nitro blue tetrazolium and 2,6-dichlorophenolindophenol.
The dependence on calmodulin and Ca2+ levels was evaluated in the presence of cofactors such as NADPH and tetrahydrobiopterin.
Nitric oxide synthase exhibited a maximum reaction rate (Vmax) of 10.2 mumol x mg-1 x min-1 for cytochrome c reduction.
Half-maximal inhibitory concentrations were 166 microM for cytochrome c, 41 microM for 2,6-dichlorophenolindophenol, and 7.3 microM for nitro blue tetrazolium.
Cytochrome c reduction activity was significantly dependent on Ca2+/calmodulin and correlated with the formation of L-citrulline.

Structured PICO

Population

Purified brain nitric oxide synthase

Intervention

Various electron acceptors (cytochrome c, nitro blue tetrazolium, 2,6-dichlorophenolindophenol) and cytochrome P450 reconstitution

Outcome

Cytochrome c reductase activity and L-citrulline formationsurrogate

Brain NO synthase possesses Ca2+/calmodulin-dependent cytochrome c reductase activity, suggesting it may participate in cellular electron transfer processes.

Cite This Study

Klatt et al. (1992) studied this question.

synapsesocial.com/papers/6a2091d23f9b8cb80cc645f2 https://doi.org/10.1016/s0021-9258(19)49920-1

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Ca2+/calmodulin-dependent cytochrome c reductase activity of brain nitric oxide synthase.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Ca2+/calmodulin-dependent cytochrome c reductase activity of brain nitric oxide synthase.

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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