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首页> 外文期刊>Journal of bacteriology >Overexpression of the PepF Oligopeptidase Inhibits Sporulation Initiation in Bacillus subtilis
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Overexpression of the PepF Oligopeptidase Inhibits Sporulation Initiation in Bacillus subtilis

机译:PepF寡肽酶的过表达抑制枯草芽孢杆菌的孢子形成。

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摘要

The yjbG gene encoding the homologue of the PepF1 and PepF2 oligoendopeptidases of Lactococcus lactis (Monnet et al., J. Biol. Chem. 269:32070–32076, 1994; Nardi et al., J. Bacteriol. 179:4164–4171, 1997) has been identified in Bacillus subtilis as an inhibitor of sporulation initiation when present in the cells on a multicopy plasmid. Genetic analysis suggested that the inhibitory effect is due to hydrolysis of the PhrA peptide in a form as small as the pentapeptide (ARNQT). Inactivation of PhrA results in deregulation of the RapA phosphatase and thus dephosphorylation of the Spo0F~~P response regulator component of the phosphorelay for sporulation initiation. When overexpressed, the B. subtilis PepF is most likely hydrolyzing additional peptides of the Phr family, as is the case for PhrC involved in control of competence development. Chromosomal inactivation of the yjbG/pepF gene did not give rise to any detectable phenotype. The function of PepF in B. subtilis remains unknown. Limited experiments with a yjbG paralogue called yusX indicated that a frameshift is present, making the corresponding gene product inactive.
机译: yjbG 基因编码乳酸乳球菌的PepF1和PepF2寡肽链酶的同源物(Monnet等人,生物化学杂志269:32070-32076,1994; Nardi等(J. Bacteriol。179:4164–4171,1997)在枯草芽孢杆菌中被鉴定为多拷贝质粒上存在于细胞中的芽孢形成抑制剂。遗传分析表明,抑制作用归因于Phr​​A肽的水解,其形式与五肽(ARNQT)一样小。 PhrA的失活导致RapA磷酸酶的失调,从而使磷灰泥的Spo0F ~~ P反应调节因子组分失磷酸化,从而引发孢子形成。过表达时, B。枯草芽孢杆菌PepF最有可能水解Phr家族的其他肽,就像PhrC参与能力发展控制一样。 yjbG / pepF 基因的染色体失活没有产生任何可检测的表型。 PemF在 B中的功能。枯草仍然未知。使用名为 yusX yjbG 旁系同源物进行的有限实验表明存在移码,导致相应的基因产物失活。

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