A Pseudomonas putida bioreporter for the detection of enzymes active on 2-alkyl-4(1H)-quinolone signalling molecules
A Pseudomonas putida bioreporter for the detection of enzymes active on 2-alkyl-4(1H)-quinolone signalling molecules
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用于检测 2-烷基-4(1H)-喹诺酮信号分子活性酶的恶臭假单胞菌生物报告仪
DOI:
10.1007/s00253-012-4236-4
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发表时间:
2013
影响因子:
5
通讯作者:
Fetzner S
中科院分区:
文献类型:
--
作者:
Müller C;Fetzner S
The quorum sensing signalling molecules 2-heptyl-3-hydroxy-4(1H)-quinolone, termed the “Pseudomonasquinolone signal” (PQS), and 2-heptyl-4(1H)-quinolone (HHQ) play an important role in the control of virulence gene expression inPseudomonas aeruginosa. To construct a bioreporter for the specific and sensitive detection of these compounds, a plasmid with thepqsRgene encoding the PQS- and HHQ-responsive transcriptional regulator PqsR, and with the PqsR-controlledpqsApromoter fused to thelacZgene, was established inPseudomonas putidaKT2440. The bioreporter responds to HHQ and PQS at concentrations in the range of 0.1–10 and 0.01–5 μM, respectively, with EC50values of 1.50 ± 0.25 μM for HHQ and 0.15 ± 0.02 μM for PQS. 2,4-Dihydroxyquinoline, a metabolite produced abundantly byP. aeruginosa, did not elicit an increase in reporter enzyme activity. To test whether the bioreporter can be used for the detection of enzymes active on AQ signalling molecules, thehodCgene coding for 2-methyl-3-hydroxy-4(1H)-quinolone 2,4-dioxygenase was expressed in the reporter strain. This dioxygenase catalyses the cleavage of PQS, albeit with very low activity. The response of the bioreporter to PQS was significantly quenched by co-expression of thehodCgene, and HPLC analysis of culture extracts verified that the PQS levels decreased during cultivation. The bioreporter can be applied to screen for AQ-converting enzymes, which will be useful tools to interfere with quorum sensing and thus virulence inP. aeruginosa.
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DOI:
10.1016/s0021-9258(18)55737-9
发表时间:
1952-05
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
I. Wells
通讯作者:
I. Wells
影响因子:
2.9
作者:
Zor, T;Seliger, Z
通讯作者:
Seliger, Z
影响因子:
5.1
作者:
Nelson, KE;Weinel, C;Fraser, CM
通讯作者:
Fraser, CM
影响因子:
2.7
作者:
Sung;Heon;Chang
通讯作者:
Chang
影响因子:
2.6
作者:
Fernandez-Pinar, Regina;Camara, Miguel;Espinosa-Urgel, Manuel
通讯作者:
Espinosa-Urgel, Manuel