Pseudomonads cytochrome

PCMH is a flavocytochrome c localized in the periplasmic space of several types of Pseudomonad (Hopper and Taylor, 1977). It catalyzes the oxidation of / -cresol first to / -hydroxybenzyl alcohol and then to / -hydroxybenzaldehyde. Electrons are passed sequentially to the endogenous cytochrome subunit and then to an exogenous secondary electron acceptor protein, possibly an azurin or another cytochrome (Causer et al., 1984). 

Denitrifying bacteria generally contain cytochrome hi as the electron donor to the nitrate reductase (197,198). This cytochrome has been partially purified from M. dentrificans (163,164), and this preparation (absorption maxima at 559, 528, and 426 nm) was rapidly oxidized by nitrate. A similar cytochrome, 6-558, was solubilized from pseudomonads (163,164,199). Another similar cytochrome, h-559, is contained, together... 

The production of HCN by Pseudomonas species has also been implicated in biological control. Hydrogen cyanide is a general biocide that chelates divalent cations and interferes with respiration by interaction with cytochrome c oxidase. Fluorescent pseudomonads are insensitive to cyanide especially as growth ceases and many strains with biocontrol activity can produce it in the presence of a suitable precursor such as glycine and Fe3+. A number of recent reviews have covered the topic of biological control by Pseudomonas in significant details [13-17]. 

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