FNR-mediated regulation of bioluminescence and anaerobic respiration in the light-organ symbiont Vibrio fischeri.

FNR-mediated regulation of bioluminescence and anaerobic respiration in the light-organ symbiont Vibrio fischeri.
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DOI:
10.1111/j.1574-6968.2010.01938.x
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发表时间:
2010-05
影响因子:
2.1
通讯作者:
Stabb EV
Stabb EV
中科院分区:
生物学4区
文献类型:
--
作者:
Septer AN;Bose JL;Dunn AK;Stabb EV

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费氏弧菌在共生感染期间诱导无氧呼吸和生物发光。在许多细菌中,氧敏感调节因子 FNR 会激活无氧呼吸,利用大肠杆菌中克隆的费氏弧菌 MJ1 的产光 lux 基因进行的初步研究表明,FNR 会刺激生物发光。为了测试费氏弧菌中 FNR 介导的生物发光和无氧呼吸调节,我们产生了费氏弧菌菌株 MJ1 和 ES114 的 fnr 突变体。在这两种菌株中,FNR 是正常的富马酸盐和硝酸盐依赖性呼吸所必需的。然而,与转基因大肠杆菌中的报道相反,FNR 介导了 lux 的抑制。 ArcA 抑制生物发光,ParcA-lacZ 报告基因在 fnr 突变体中表达减少,表明 FNR 可能通过 arcA 对生物发光产生间接影响。最后,ES114 的 fnr 突变体在其宿主乌贼 Euprymna scolopes 的定殖中并未受到损害。这项研究将 FNR 的特征扩展到弧菌科,并强调了在其天然背景下研究勒克斯调节的重要性。
Vibrio fischeri induces both anaerobic respiration and bioluminescence during symbiotic infection. In many bacteria, the oxygen-sensitive regulator FNR activates anaerobic respiration, and a preliminary study using the light-generating lux genes from V. fischeri MJ1 cloned in Escherichia coli suggested that FNR stimulates bioluminescence. To test for FNR-mediated regulation of bioluminescence and anaerobic respiration in V. fischeri, we generated fnr mutants of V. fischeri strains MJ1 and ES114. In both strains, FNR was required for normal fumarate- and nitrate-dependent respiration. However, contrary to the report in transgenic E. coli, FNR mediated repression of lux. ArcA represses bioluminescence, and ParcA-lacZ reporters showed reduced expression in fnr mutants, suggesting a possible indirect effect of FNR on bioluminescence via arcA. Finally, the fnr mutant of ES114 was not impaired in colonization of its host squid, Euprymna scolopes. This study extends characterization of FNR to the Vibrionaceae and underscores the importance of studying lux regulation in its native background.
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