海洋工程材料团队
[研究进展]袁硕同学研究了游离态铜绿假单胞菌对死细菌表面的适应性响应机制(相关成果发表在Colloids and Surfaces B: Biointerfaces)
发布时间: 2021-01-29 浏览次数: 128

Title:Adaptive behaviors of planktonic Pseudomonas aeruginosa in response to the surface-deposited dead siblings



Abstract: In this study, the 3D motion behaviors and the underlying adaptation mechanism of planktonic Pseudomonas aeruginosa (PAO1) in response to the deposited dead siblings nearby were explored. Utilizing a real-time 3D tracking technique, digital holographic microscopy (DHM), we demonstrate that planktonic cells near the surface covered with dead siblings have a lower density and a reduced 3D velocity compared with those upon viable ones. As a sign of chemosensory responses, bacteria swimming near the dead siblings exhibit increase in frequency of the ‘flick’ motion. Transcriptomic analysis by RNA–seq reveals an upregulated expression of dgcM and dgcE inhibited the movement of PAO1, accompanied by increased transcriptional levels of the virulence factor-related genes hcp1, clpV1, and vgrG1. Moreover, the decrease in L-glutamate and the increase in succinic acid in the metabolites of the dead bacteria layer promote the dispersion of planktonic bacteria. As a result, the dead siblings on a surface inhibit the bacterial accumulation and activate the adaptive defensive responses of planktonic PAO1 in the vicinity.

 

文章链接:https://doi.org/10.1016/j.colsurfb.2020.111408