Journal of Tropical Oceanography >
Screening and identification of a quorum sensing inhibitory actinomycetes derived from marine sediments
Received date: 2020-01-20
Request revised date: 2020-04-30
Online published: 2020-05-19
Supported by
Strategic Priority Research Program of the Chinese Academy of Sciences(XDA13020300)
Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2019ZD0401)
Key Area Research and Development Program of Guangdong Province(2020B1111030004)
Copyright
Quorum Sensing Inhibitors (QSIs) are promising alternatives to antibiotics, which can reduce the infectivity and virulence of pathogenic bacteria by interruption of quorum sensing (QS) pathways. The strategy aimed at disarming rather than at eradicating bacterial pathogens, and imposed no strong selective pressure on bacteria that can lead to the development of resistance mechanisms. Marine microorganism is one of the most potential sources of novel QSIs. In the present study, actinomycetes strains, isolated from the deep-sea sediment samples obtained from the South China Sea and Indian Ocean, were tested by Chromobacterium violaceum 026 (CV026) model, for screening for QS inhibitory strains. Strain SCSIO 53717 showed inhibitory activity against quorum sensing of CV026. The extract of SCSIO 53717 significantly reduced the production of CV026 violacein, and the extract of the strain showed no inhibitory effects on the growth of CV026 strain within the concentration range from 0 to 1000 mg·mL-1. This strain was assigned to the genus Kocuria based on morphological characteristics and 16S rRNA gene sequence analysis. To the best of our knowledge, this is the first time that Kocuria is reported to be QS inhibitory active. This result indicates that strain SCSIO 53717 is worthy further studying.
LI Yanqun , CHEN Rouwen , LIN Zonghao , TIAN Xinpeng , YIN Hao . Screening and identification of a quorum sensing inhibitory actinomycetes derived from marine sediments[J]. Journal of Tropical Oceanography, 2021 , 40(1) : 75 -81 . DOI: 10.11978/2020011
图1 SCSIO 53717提取物抑制紫色菌素的产生图中数字1、2、3、4、5依次表示浓度为25、50、100、150、200mg·mL-1的SCSIO 53717提取物(5μL); 6为阳性对照(加入5μL呋喃酮C30); 7为阴性对照(加入5μL甲醇溶液) Fig. 1 Inhibition of violacein production by SCSIO 53717 extracts. The numbers 1, 2, 3, 4, and 5 in the figure indicate the SCSIO 53717 extract (5μL) with a concentration of 25, 50, 100, 150, and 200 mg·mL-1, respectively; the number 6 is the positive control (adding 5μL of furanone C30); and the number 7 is the negative control (adding 5μL of methanol solution) |
图6 基于菌株SCSIO 53717及其近缘属种以16S rRNA基因序列构建的系统进化树线段0.005代 Fig. 6 Neighbor-Joining tree constructed showing the phylogenetic relationships among SCSIO 53717 strain and other related strains based on 16S rRNA gene sequence. Scale bar: 0.005 nucleotide substitution per 200 nucleotides of 16S rRNA gene sequence. Numerals on branches are the supporting percentage by 1000 replicates |
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