Identification of A Ring-Hydroxylating Dioxygenases Capable of Anthracene and Benz[a]anthracene Oxidization from < b > < i > Rhodococcus < /i > < /b > sp. P14

Nowadays, contamination of soil and marine sediments by polycyclic aromatic hydrocarbons (PAHs) has become a serious problem all over the world.Rhodococcus sp. P14 was isolated from sediments with crude oil contaminate and showed degradation ability on various PAHs. The genome ofRhodococcus sp. P14 was sequenced. A gene cluster encoding a ring-hydroxylating dioxygenase Baa related to PAH degradation was identified by bioinformatics. The expression level of genebaaA was increased when P14 was cultured with anthracene, pyrene, phenanthrene, or benz[a] ­anthracene as the single carbon source. The recombinant protein Baa was overexpressed inE. coli BL21 (DE3). Further investigations on the recombinant protein Baa inE. coli demonstrated that it was able to oxidize anthracene and benz [a]anthracene, resulting in 9,10-dihydroxyanthracene and 7, 12-dihydroxybenz[a]anthracene as metabolites, respectively. These results indicate that Baa plays an important role in PAH degradation inRhodococcus sp. P14 and Baa has potential application in the bioremediation of PAHs in the contaminated environment.J Mol Microbiol Biotechnol 2018;28:183 –189
Source: Journal of Molecular Microbiology and Biotechnology - Category: Microbiology Source Type: research