RbsB (NTHI_0632) mediates quorum signal uptake in nontypeable Haemophilus influenzae strain 86-028NP.

RbsB (NTHI_0632) mediates quorum signal uptake in nontypeable Haemophilus influenzae strain 86-028NP.
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DOI:
10.1111/j.1365-2958.2011.07831.x
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发表时间:
2011-11
影响因子:
3.6
通讯作者:
Swords WE
Swords WE
中科院分区:
生物学2区
文献类型:
--
作者:
Armbruster CE;Pang B;Murrah K;Juneau RA;Perez AC;Weimer KE;Swords WE

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不可分型流感嗜血杆菌 (NTHI) 是一种呼吸道共生机会致病菌,持续存在于气道粘膜表面的生物膜内。对于许多物种来说,生物膜的形成受到群体信号的影响。我们之前的工作表明,自诱导剂-2 (AI-2) 的产生可促进 NTHI 86-028NP 生物膜的形成和持久性。 NTHI 86-028NP 编码 ABC 转运蛋白,注释为核糖转运系统,其中包含与结合 AI-2 的大肠杆菌 LsrB 和放线菌聚合杆菌 RbsB 蛋白相似的蛋白 (RbsB)。在这项研究中,rbsB 失活显着降低了 NTHI 86-028NP 对 AI-2 和 AI-2 前体二羟基戊二酮 (DPD) 的摄取。此外,核糖或其他戊糖不会竞争性抑制 DPD 摄取。 rbsB 的转录水平随着 DPD 的反应以及细菌接近静止期生长而增加。 NTHI 86-028NP rbsB 突变体还形成了厚度和总生物量显着降低的生物膜,并且表面磷酰胆碱减少,与 luxS 突变体类似。感染研究表明,rbsB 的缺失会损害龙猫中耳中的细菌持久性,这与我们之前对 luxS 突变体的结果类似。基于这些数据,我们得出结论,在 NTHI 86-028NP 中,RbsB 是一种 LuxS/AI-2 调节蛋白,是摄取 AI-2 并对其做出反应所必需的。
Nontypeable Haemophilus influenzae (NTHI) is a respiratory commensal and opportunistic pathogen, which persists within biofilms on airway mucosal surfaces. For many species, biofilm formation is impacted by quorum signaling. Our prior work shows that production of autoinducer-2 (AI-2) promotes biofilm development and persistence for NTHI 86-028NP. NTHI 86-028NP encodes an ABC transporter annotated as a ribose transport system that includes a protein (RbsB) with similarity to the Escherichia coli LsrB and Aggregatibacter actinomycetemcomitans RbsB proteins that bind AI-2. In this study, inactivation of rbsB significantly reduced uptake of AI-2 and the AI-2 precursor dihydroxypentanedione (DPD) by NTHI 86-028NP. Moreover, DPD uptake was not competitively inhibited by ribose or other pentose sugars. Transcript levels of rbsB increased in response to DPD and as bacteria approached stationary-phase growth. The NTHI 86-028NP rbsB mutant also formed biofilms with significantly reduced thickness and total biomass and reduced surface phosphorylcholine, similar to a luxS mutant. Infection studies revealed that loss of rbsB impaired bacterial persistence in the chinchilla middle-ear, similar to our previous results with luxS mutants. Based on these data, we conclude that in NTHI 86-028NP, RbsB is a LuxS/AI-2 regulated protein that is required for uptake of and response to AI-2.
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