期刊
MOLECULAR MICROBIOLOGY
卷 115, 期 2, 页码 320-331出版社
WILEY
DOI: 10.1111/mmi.14618
关键词
EF‐ P; glucose uptake; GntR2; phosphotransferase system; ptsG; translational control
资金
- Deutsche Forschungsgemeinschaft [GRK2062, TRR174]
- Brazilian Exchange Program
Translation of the glucose-specific permease EIIGlc and the transcriptional activator GntR2 are both dependent on elongation factor P (EF-P). XPPX motifs play a crucial role in the activity of EIIGlc. Decreased levels of EIIGlc in an efp mutant can be compensated for by other regulators. These findings highlight a translational bottleneck in the production of EIIGlc with implications for future strain engineering strategies.
Translating ribosomes require elongation factor P (EF-P) to incorporate consecutive prolines (XPPX) into nascent peptide chains. The proteome of Corynebacterium glutamicum ATCC 13032 contains a total of 1,468 XPPX motifs, many of which are found in proteins involved in primary and secondary metabolism. We show here that synthesis of EIIGlc, the glucose-specific permease of the phosphoenolpyruvate (PEP): sugar phosphotransferase system (PTS) encoded by ptsG, is strongly dependent on EF-P, as an efp deletion mutant grows poorly on glucose as sole carbon source. The amount of EIIGlc is strongly reduced in this mutant, which consequently results in a lower rate of glucose uptake. Strikingly, the XPPX motif is essential for the activity of EIIGlc, and substitution of the prolines leads to inactivation of the protein. Finally, translation of GntR2, a transcriptional activator of ptsG, is also dependent on EF-P. However, its reduced amount in the efp mutant can be compensated for by other regulators. These results reveal for the first time a translational bottleneck involving production of the major glucose transporter EIIGlc, which has implications for future strain engineering strategies.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据