| Autor: |
Genki Akanuma, Tomoaki Tagana, Maho Sawada, Shota Suzuki, Tomohiro Shimada, Kan Tanaka, Fujio Kawamura, Yasuyuki Kato‐Yamada |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
MicrobiologyOpen, Vol 8, Iss 8, Pp n/a-n/a (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2045-8827 |
| DOI: |
10.1002/mbo3.815 |
| Popis: |
Abstract The ε subunit of FoF1‐ATPase/synthase (FoF1) plays a crucial role in regulating FoF1 activity. To understand the physiological significance of the ε subunit‐mediated regulation of FoF1 in Bacillus subtilis, we constructed and characterized a mutant harboring a deletion in the C‐terminal regulatory domain of the ε subunit (ε∆C). Analyses using inverted membrane vesicles revealed that the ε∆C mutation decreased ATPase activity and the ATP‐dependent H+‐pumping activity of FoF1. To enhance the effects of ε∆C mutation, this mutation was introduced into a ∆rrn8 strain harboring only two of the 10 rrn (rRNA) operons (∆rrn8 ε∆C mutant strain). Interestingly, growth of the ∆rrn8 ε∆C mutant stalled at late‐exponential phase. During the stalled growth phase, the membrane potential of the ∆rrn8 ε∆C mutant cells was significantly reduced, which led to a decrease in the cellular level of 70S ribosomes. The growth stalling was suppressed by adding glucose into the culture medium. Our findings suggest that the C‐terminal region of the ε subunit is important for alleviating the temporal reduction in the membrane potential, by enhancing the ATP‐dependent H+‐pumping activity of FoF1. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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