Characteristics and growth kinetics of biomass of Citrobacter freundii strains PYI-2 and Citrobacter portucalensis strain YPI-2 during the biodegradation of Ibuprofen

Chopra, Sunil; Kumar, Dharmender

doi:10.1007/s10123-022-00248-7

Cited by 8 publications

(1 citation statement)

References 72 publications

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“…These fortuitous oxidative catabolic reactions were probably based on cytochrome P450 systems or other types of generally unspecific oxidases. Some of the bacterial strains which co-metabolized ibuprofen when growing on complex media include the actinobacterial strain Patulibacter medicamentivorans [10], proteobacterial Citrobacter strains [11], and the Firmicutes strain Bacillus thuringiensis B1 [12]. The respective authors proposed, upon GC-MS or LC-MS analyses of their culture broths, a number of structures of potential products such as hydroquinone, hydroxyquinol, and (oxidated) dealkylated ibuprofen, and also products of the possible cleavage of the aromatic ring.…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of Microtoxic Phenylpropanoids (Phenylpropanoic Acid and Ibuprofen) by Bacteria and the Relevance for Their Removal from Wastewater Treatment Plants

Wittich

Haı̈dour

Aguilar-Romero

et al. 2023

Genes

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The NSAID ibuprofen (2-(4-isobutylphenyl)propanoic acid) and the structurally related 3-phenylpropanoic acid (3PPA), are widely used pharmaceutical and personal care products (PPCPs) which enter municipal waste streams but whose relatively low rates of elimination by wastewater treatment plants (WWTPs) are leading to the contamination of aquatic resources. Here, we report the isolation of three bacterial strains from a municipal WWTP, which as a consortium are capable of mineralizing ibuprofen. These were identified as the Pseudomonas citronellolis species, termed RW422, RW423 and RW424, in which the first two of these isolates were shown to contain the catabolic ipf operon responsible for the first steps of ibuprofen mineralization. These ipf genes which are associated with plasmids could, experimentally, only be transferred between other Sphingomonadaceae species, such as from the ibuprofen degrading Sphingopyxis granuli RW412 to the dioxins degrading Rhizorhabdus wittichii RW1, generating RW421, whilst a transfer from the P. citronellolis isolates to R. wittichii RW1 was not observed. RW412 and its derivative, RW421, as well as the two-species consortium RW422/RW424, can also mineralize 3PPA. We show that IpfF can convert 3PPA to 3PPA-CoA; however, the growth of RW412 with 3PPA produces a major intermediate that was identified by NMR to be cinnamic acid. This and the identification of other minor products from 3PPA allows us to propose the major pathway used by RW412 to mineralize 3PPA. Altogether, the findings in this study highlight the importance of ipf genes, horizontal gene transfer, and alternative catabolic pathways in the bacterial populations of WWTPs to eliminate ibuprofen and 3PPA.

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Section: Introductionmentioning

confidence: 99%