Review Article
A Honey Trap for the Treatment of Acne: Manipulating the Follicular Microenvironment to Control Propionibacterium acnes
Table 1
Some osmoprotectant systems detected in P. acnes.
| Osmoprotectant | Comment |
| Aquaglyceroporin/glycerol uptake facilitator | Adjacent glycerol kinase suggests role of glycerol as a carbon and energy source, but glycerol-3-phosphate dehydrogenase is not in same operon. |
| Glycine betaine/L-proline three component ABC transporter (uptake system) | P. acnes can synthesise proline but not betaines or ectoine. |
| Trehalose synthesis | Different pathways in different strains, for example, from maltose, possibly from glycogen stores. |
| Osmosensitive potassium channel | Six genes; products mediate signal transduction in response to changes in turgor pressure. |
| Small conductance mechanosensitive ion channel Large conductance mechanosensitive ion channel | Responsive to membrane stretch such as that induced by increased turgor pressure inside the cell; small one close to glycerol uptake facilitator. |
| OsmC (peroxiredoxin) | Close to glycerol uptake facilitator; typically induced in late exponential phase. Strongly deregulated in P. acnes. |
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