3 questions on "Metabolic Pathway of Microorganisms - Oxydation of Sulfur Compounds"

What are the most common sulfur compounds used as electron donors and what is the result of sulfur chemolithotrophy?
H2S, S0, and S2O32-; SO32- can also be oxidized. Elemental sulfur exists as a potential energy reserve through the oxidation of sulfur to sulfate. The result is that many sulfur bacteria have evolved to be acidtolerant.
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What is the Sox system and how does it work?
A pathway for conserving energy from the oxidation of sulfur compounds. There are four key proteins: SoxXA, SoxYZ, SoxB, and SoxCD, which are all present in the periplasm. SoxXA forms a bond between the sulfur compound and SoxYZ. The compund is released as sulfate through SoxB. SoxCD mediates the removal of 6 electrons from the compound.
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What happens in microbes if the protein SoxCD is missing from the Sox system?
Sulfur bound to SoxYZ is added to a growing sulfur granule in the periplasm, which is transported to the ceriplasm where it is oxidized to SO32-. This compound is oxidized to sulfate plus two electrons through either sulfite reductase or adenosine phosposulfate reductase. This oxidation yields an energy-rich phosphate bond.
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