Bacterial chemotaxis: a way forward to aromatic compounds biodegradation

Abstract

Worldwide industrial development has released hazardous polycyclic aromatic compounds into the environment. These pollutants need to be removed to improve the quality of the environment. Chemotaxis mechanism has increased the bioavailability of these hydrophobic compounds to microorganisms. The mechanism, however, is poorly understood at the ligand and chemoreceptor interface. Literature is unable to furnish a compiled review of already published data on up-to-date research on molecular aspects of chemotaxis mechanism, ligand and receptor-binding mechanism, and downstream signaling machinery. Moreover, chemotaxis-linked biodegradation of aromatic compounds is required to understand the chemotaxis role in biodegradation better. To fill this knowledge gap, the current review is an attempt to cover PAHs occurrence, chemical composition, and potential posed risks to humankind. The review will cover the aspects of microbial signaling mechanism, the structural diversity of methyl-accepting chemotaxis proteins at the molecular level, discuss chemotaxis mechanism role in biodegradation of aromatic compounds in model bacterial genera, and finally conclude with the potential of bacterial chemotaxis for aromatics biodegradation.

Identification of Antibacterial Components in the Methanol-Phase Extract from Edible Herbaceous Plant Rumex madaio Makino and Their Antibacterial Action Modes

“…In this study, expression of 23 DEGs involved in three substructures of the flagellum, including the filament, hook and basal body [23], were significantly downregulated at the transcriptional level in V. parahaemolyticus ATCC17802 (0.055-to 0.49-fold) (p < 0.05), which indicated the depressed flagellum assembly that led to inactive motility of V. parahaemolyticus ATCC17802. The 17 down-regulated DEGs in the bacterial chemotaxis [24] (0.101-to 0.491-fold) (p < 0.05) provided indirect evidence for this result.…”

Integrated Multi-omics Investigations Reveal the Key Role of Synergistic Microbial Networks in Removing Plasticizer Di-(2-Ethylhexyl) Phthalate from Estuarine Sediments

“…In addition, differentially expressed genes related to chemotaxis and flagellar synthesis in DEHP-degrading Sedimenticola (Bin14) and Aestuariibacter (Bin44) as well as o -phthalic acid-degrading Aestuariibacter (Bin60) suggest that DEHP can be an attractant for not only DEHP degraders but also some o -phthalic acid-degrading anaerobes. Some bacteria display chemotaxis toward substrates that they are not able to degrade ( 40 , 41 ). Accordingly, we assumed that DEHP induced chemosensory responses in some o -phthalic acid-degrading gammaproteobacteria, enhancing their better attraction to o -phthalic acid produced from DEHP.…”

Integrated multi-omics investigations reveal the key role of synergistic microbial networks in removing plasticizer di-(2-ethylhexyl) phthalate from estuarine sediments

“…In addition, differentially expressed genes related to chemotaxis and flagellar synthesis in DEHP-degrading Sedimenticola (Bin 14) and Aestuariibacter (Bin44) as well as o -phthalic acid-degrading Aestuariibacter (Bin60) suggest that DEHP can be an attractant for not only DEHP degraders but also some o -phthalic acid-degrading anaerobes. Some bacteria display chemotaxis toward substrates that they are not able to degrade [39, 40]. Accordingly, we assumed that DEHP induced chemosensory in some o -phthalic acid-degrading gammaproteobacteria, enhancing their better attraction to o -phthalic acid produced from DEHP.…”