Biological Functions of ilvC in Branched-Chain Fatty Acid Synthesis and Diffusible Signal Factor Family Production in Xanthomonas campestris.

Biological Functions of ilvC in Branched-Chain Fatty Acid Synthesis and Diffusible Signal Factor Family Production in Xanthomonas campestris.
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iIvC 在野油菜黄单胞菌支链脂肪酸合成和扩散信号因子家族产生中的生物学功能

DOI:
10.3389/fmicb.2017.02486
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发表时间:
2017
影响因子:
5.2
通讯作者:
Wang HH
Wang HH
中科院分区:
生物学2区
文献类型:
--
作者:
Li KH;Yu YH;Dong HJ;Zhang WB;Ma JC;Wang HH

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在细菌中,支链氨基酸(BCAA)的代谢与支链脂肪酸(BCFA)的合成途径密切相关。虽然以前的研究已经报道了BCFAs的生物合成,但BCAAs代谢和BCFAs生物合成之间更详细的联系仍有待解决。在这项研究中,我们删除了ilvC基因,编码酮醇酸还原异构酶的支链氨基酸合成途径,从野油菜黄单胞菌pv。campestris(Xcc)基因组。我们的特点是基因功能的BCFAs生物合成和生产的扩散信号因子(DSF)家族的信号。ilvC的破坏导致Xcc成为缬氨酸和异亮氨酸的营养缺陷型,并失去通过碳水化合物代谢合成BCFA的能力。此外,ilvC突变体降低了Xcc产生DSF家族信号,尤其是支链DSF家族信号的能力,这可能是Xcc对寄主植物致病性降低的主要原因。在本报告中,我们证实了BCFA在Xcc细胞适应低温方面没有主要功能。
In bacteria, the metabolism of branched-chain amino acids (BCAAs) is tightly associated with branched-chain fatty acids (BCFAs) synthetic pathways. Although previous studies have reported on BCFAs biosynthesis, more detailed associations between BCAAs metabolism and BCFAs biosynthesis remain to be addressed. In this study, we deleted the ilvC gene, which encodes ketol-acid reductoisomerase in the BCAAs synthetic pathway, from the Xanthomonas campestris pv. campestris (Xcc) genome. We characterized gene functions in BCFAs biosynthesis and production of the diffusible signal factor (DSF) family signals. Disruption of ilvC caused Xcc to become auxotrophic for valine and isoleucine, and lose the ability to synthesize BCFAs via carbohydrate metabolism. Furthermore, ilvC mutant reduced the ability to produce DSF-family signals, especially branched-chain DSF-family signals, which might be the main reason for Xcc reduction of pathogenesis toward host plants. In this report, we confirmed that BCFAs do not have major functions in acclimatizing Xcc cells to low temperatures.
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