Abstract
Polychlorinated biphenyls (PCBs) are persistent organic pollutants in the environment that are responsible for many adverse health effects. Bioremediation appears to be a healthy and cost-effective alternative for remediating PCB-contaminated environments. While some microbial species have been observed to be capable of transforming PCBs, only two different microbial pathways (rdh and bph pathways) have been described to be involved in PCB transformations. Ligninolytic enzymes have been observed or are under suspicion in some microbial PCB transformations. However, the role of these promising PCB-transforming enzymes, which are produced by fungi and some aerobic bacteria, is still unclear. The present review describes their role by identifying microbial PCB-transforming species and their reported ligninolytic enzymes whether proven or suspected to be involved in PCB transformations. There are several lines of evidence that ligninolytic enzymes are responsible for PCB transformations such as (1) the ability of purified laccases from Myceliophthora thermophila, Pycnoporus cinnabarinus, Trametes versicolor, Cladosporium sp, and Coprinus cumatus to transform hydroxy-PCBs; (2) the increased production of laccases and peroxidases by many fungi in the presence of PCBs; and (3) the enhanced PCB transformation by Pseudomonas stutzeri and Sinorhizobium meliloti NM after the addition of ligninolytic enzyme enhancers. However, if the involvement of ligninolytic enzymes in PCB transformation is clearly demonstrated in some fungal species, it does not seem to be implicated in all microbial species suggesting other still unknown metabolic pathways involved in PCB transformation and different from the bph and rdh pathways. Therefore, PCB transformation may involve several metabolic pathways, some involving ligninolytic enzymes, bph or rdh genes, and some still unknown, depending on the microbial species. In addition, current knowledge does not fully clarify the role of ligninolytic enzymes in PCB oxidation and dechlorination. Therefore, further studies focusing on purified ligninolytic enzymes are needed to clearly elucidate their role in PCB transformation.
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We are very grateful to Professor Tim Vogel for having reviewed this review with regard to English grammar and writing.
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This work was funded by the French Auvergne-Rhône-Alpes AURA Region (Pack Ambition Recherche 2021) programs. FM was supported by a grant from the French National Research and Technology Association (ANRT) and Envisol (https://www.envisol.fr/) fellowship.
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: Supplementary Table 1. In vitro PCB transformers. References represent studies reporting PCB transformation of the corresponding species for which the ligninolytic enzyme is either unknown or absent.
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Maucourt, F., Doumèche, B., Nazaret, S. et al. Under explored roles of microbial ligninolytic enzymes in aerobic polychlorinated biphenyl transformation. Environ Sci Pollut Res 31, 19071–19084 (2024). https://doi.org/10.1007/s11356-024-32291-4
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DOI: https://doi.org/10.1007/s11356-024-32291-4