Characterization of Myxococcus xanthus MazF and implications for a new point of regulation.

Characterization of Myxococcus xanthus MazF and implications for a new point of regulation.
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DOI:
10.1111/mmi.12165
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发表时间:
2013-03
影响因子:
3.6
通讯作者:
Shimkets LJ
Shimkets LJ
中科院分区:
生物学2区
文献类型:
--
作者:
Boynton TO;McMurry JL;Shimkets LJ

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在发育过程中,黄色粘球菌细胞会经历程序性细胞死亡 (PCD),其中 80% 的营养细胞死亡。此前,MazF RNA 干扰酶已被证实参与了这一作用。最近,研究表明,mazF 基因的缺失并不能消除野生型菌株 DK1622 中的 PCD,正如最初在 DZF1 中看到的那样。为了阐明 MazF 的作用,在存在和不存在所提出的抗毒素 MrpC 的情况下,使用高灵敏度测定对重组酶进行了表征。与先前报道的 MrpC 抑制 MazF 活性相比,MrpC 或 MrpC2(MrpC 的 N 末端截短形式)的水解速率以浓度依赖性方式增强。此外,直到诱导后 6-8 小时才检测到 MazF 转录本,这表明早期不需要抗毒素。潜在的 MazF 靶点被鉴定出来,其转录水平在 DK1622 中下降,而在 mazF 缺失菌株中保持稳定。消除 nla6 转录物中的 mazF 水解位点会导致 mRNA 过量产生。因此,MazF 负向调节特定转录本。此外,我们表明,DK1622 和 DZF1 中去除 mazF 导致的发育表型差异是由于后一菌株中存在 pilQ1 等位基因。
During development, Myxococcus xanthus cells undergo programmed cell death (PCD) whereby 80% of vegetative cells die. Previously, the MazF RNA interferase has been implicated in this role. Recently, it was shown that deletion of the mazF gene does not eliminate PCD in wild-type strain DK1622 as originally seen in DZF1. To clarify the role of MazF, recombinant enzyme was characterized using a highly sensitive assay in the presence and absence of the proposed antitoxin MrpC. In contrast to previous reports that MrpC inhibits MazF activity, the hydrolysis rate was enhanced in a concentration-dependent manner with MrpC or MrpC2, an N-terminally truncated form of MrpC. Furthermore, MazF transcripts were not detected until 6–8 hours post-induction, suggesting an antitoxin is unnecessary earlier. Potential MazF targets were identified and their transcript levels were shown to decline in DK1622 while remaining steady in a mazF deletion strain. Elimination of the mazF hydrolysis site in the nla6 transcript resulted in overproduction of the mRNA. Thus, MazF negatively regulates specific transcripts. Additionally, we show that discrepancies in the developmental phenotypes caused by removal of mazF in DK1622 and DZF1 are due to the presence of the pilQ1 allele in the latter strain.
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