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How do gram-positive build proton gradient? No periplasm..

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How do gram-positive build proton gradient? No periplasm..

Postby poobear » Mon May 16, 2011 9:11 pm

Hi

The proton gradient in bacteria are mostly used to create ATP and to drive the flagella as far as I know.
In gram-negative bacteria such as E. coli this is easy for me to understand, just send the protons out to the periplasm and then let them come back.

But in gram-positive bacteria there is no periplasm, just a giant layer of peptidoglycan. So does these bacteria really send the protons extracellularly? This would just dilute the protons SOO much that I don't see it possible.

Does anyone know anything about this? I searched the literature but had a hard time finding relevant articles.

Thanks!
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Postby JackBean » Fri Nov 25, 2011 1:55 pm

I think they use the cell wall anyway.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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