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What is reverse electron transport utilized for in species (for example, purple sulfur bacteria) that employ...

What is reverse electron transport utilized for in species (for example, purple sulfur bacteria) that employ it? Why is it needed?

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Reverse electron transfer is a mitochondrial signaling pathway and also plays a mechanism in microbial metabolism. The redox state of the CoQ pool determines electron leak and superoxide production and can be used by mitochondria as a signaling mechanism. The energy is supplied by consuming proton motive force to drive electrons in a reverse direction through an electron transport chain

It is needed in purple bacteria which lack external electron carriers to spontaneously reduce NADP+ to NADPH, so they have to use their reduced quinones to reduce NADP+. This process is driven by the proton motive force and is called reverse electron flow.

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