Abstract

Purified malate-vitamin K reductase (MKR) from Mycobacterium phlei , which requires phospholipid and FAD for the enzymatic reduction of dye electron acceptors, was used as an electron transfer system in combination with synthetic phospholipid vesicles. Ferricyanide entrapped inside the sonically prepared vesicles was enzymatically reduced by MKR. The rate of reduction of ferricyanide by MKR was dependent upon a lipid soluble mediator. The rate of enzymatic reduction of ferricyanide by malate-vitamin K reductase was increased by the addition of phenazine methosulfate (PMS) or benzoquinone.

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