Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An intermediate free radical generated in the conversion of quinones to/from hydroquinones.

Etymologies

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Examples

  • Cytochrome P-450-like hemeproteins that contain a flavin semiquinone radical.

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  • EPR analysis revealed that characteristics of the semiquinone radical of bound MQ are similar to those of the semiquinone radical of bound UQ and indicated an electron flow from PQQ to MQ as in the case of UQ.

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  • The essential role of the reductase domain can be characterized, similarly to the reductase domain of Cyt-P450, as accepting electrons from a two electron donor (NADPH) and shuttling them to a single electron acceptor (haem) by forming stable semiquinone intermediates.

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