Journal
FRONTIERS IN MICROBIOLOGY
Volume 12, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fmicb.2021.634593
Keywords
AHL-lactonase; marine Palk Bay sediment; Pseudomonas aeruginosa; Psychrobacter sp; quorum quenching
Categories
Funding
- Department of Science and Technology - Fund for Improvement in S&T Infrastructure [DST-FIST] [SR/FST/LSI-639/2015(C)]
- University Grants Commission - Special Assistance Programme - the Department Research Support [UGC SAP-DRS-II] [F.5-1/2018/DRS-II (SAP-II)]
- Department of Science and Technology Promotion of University Research and Scientific Excellence Grant [DST-PURSE] [SR/PURSE Phase 2/38 (G)]
- University Grants Commission (UGC), India [4-3/2006(BSR)/11-61/2008(BSR)]
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Quorum sensing is a communication mechanism used by bacteria through small self-produced chemicals to regulate virulence factors' production and biofilm formation. The study identifies a marine bacterium, Psychrobacter sp., with potent quorum quenching activity against bacterial pathogenesis. This bacterium shows promise in controlling biofilm formation and virulence factors, leading to potential applications in combating multidrug resistant bacterial infections.
Quorum sensing (QS) is a signaling mechanism governed by bacteria used to converse at inter- and intra-species levels through small self-produced chemicals called N-acylhomoserine lactones (AHLs). Through QS, bacteria regulate and organize the virulence factors' production, including biofilm formation. AHLs can be degraded by an action called quorum quenching (QQ) and hence QQ strategy can effectively be employed to combat biofilm-associated bacterial pathogenesis. The present study aimed to identify novel bacterial species with QQ potential. Screening of Palk Bay marine sediment bacteria for QQ activity ended up with the identification of marine bacterial isolate 28 (MSB-28), which exhibited a profound QQ activity against QS biomarker strain Chromobacterium violaceum ATCC 12472. The isolate MSB-28 was identified as Psychrobacter sp. through 16S-rRNA sequencing. Psychrobacter sp. also demonstrated a pronounced activity in controlling the biofilm formation in different bacteria and biofilm-associated virulence factors' production in P. aeruginosa PAO1. Solvent extraction, heat inactivation, and proteinase K treatment assays clearly evidence the enzymatic nature of the bioactive lead. Furthermore, AHL's lactone ring cleavage was confirmed with experiments including ring closure assay and chromatographic analysis, and thus the AHL-lactonase enzyme production in Psychrobacter sp. To conclude, this is the first report stating the AHL-lactonase mediated QQ activity from marine sediment bacteria Psychrobacter sp. Future work deals with the characterization, purification, and mass cultivation of the purified protein and should pave the way to assessing the feasibility of the identified protein in controlling QS and biofilm-mediated multidrug resistant bacterial infections in mono or multi-species conditions.
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