Metabolic Mechanism of Bacillus sp. LM24 under Abamectin Stress

Abstract

Abamectin (ABM) has been recently widely used in aquaculture. However, few studies have examined its metabolic mechanism and ecotoxicity in microorganisms. This study investigated the molecular metabolic mechanism and ecotoxicity of Bacillus sp. LM24 (B. sp LM24) under ABM stress using intracellular metabolomics. The differential metabolites most affected by the bacteria were lipids and lipid metabolites. The main significant metabolic pathways of B. sp LM24 in response to ABM stress were glycerolipid; glycine, serine, and threonine; and glycerophospholipid, and sphingolipid. The bacteria improved cell membrane fluidity and maintained cellular activity by enhancing the interconversion pathway of certain phospholipids and sn-3-phosphoglycerol. It obtained more extracellular oxygen and nutrients to adjust the lipid metabolism pathway, mitigate the impact of sugar metabolism, produce acetyl coenzyme A to enter the tricarboxylic acid (TCA) cycle, maintain sufficient anabolic energy, and use some amino acid precursors produced during the TCA cycle to express ABM efflux protein and degradative enzymes. It produced antioxidants, including hydroxyanigorufone, D-erythroascorbic acid 1′-a-D-xylopyranoside, and 3-methylcyclopentadecanone, to alleviate ABM-induced cellular and oxidative damage. However, prolonged stress can cause metabolic disturbances in the metabolic pathways of glycine, serine, threonine, and sphingolipid; reduce acetylcholine production; and increase quinolinic acid synthesis.

The Role of Biodegrading-bacteria to Remove Bisphenol-A from Polluted Soils

“…The examination of bacterial degradation behaviour had predominantly focused on the impact of metabolites such as enzymes and polysaccharides; hence, there are inherent limitations in elucidating the breakdown mechanism of BPA solely by using these methods [41,42]. Indeed, molecular analysis held the promise of providing a more profound and comprehensive understanding of cognition; this approach allowed for detailed exploration of various aspects, as identifying the metabolites involved in bacterial degradation functions, elucidating the pathways employed by bacteria for degradation of pollutants and uncovering the modes of bacterial transport to pollutants; by delving into these molecular intricacies, researchers can gain deeper insights into the mechanisms and processes underlying bacterial degradation of pollutants, contributing to more nuanced comprehensions of cognitive functions in this context [43,44]. Hence, there remained a notable gap in research concerning the evaluation of biodegradation mechanisms from a sufficiently comprehensive perspective.…”