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Metabolite repression inhibits degradation of benzo[a]pyrene and dibenz[a,h]anthracene by Stenotrophomonas maltophilia VUN 10,003
journal contribution
posted on 2023-05-17, 08:21 authored by Juhasz, AL, Stanley, GA, Margaret BritzMargaret BritzLarge inocula of Stenotrophomonas maltophilia VUN 10,003 were used to investigate bacterial degradation of benzo[a]pyrene and dibenz[a,h]anthracene. Although strain VUN 10,003 was capable of degrading 10-15 mg l-1 of the five-ring compounds in the presence of pyrene after 63 days, further addition of pyrene after degradation of the five-ring polycyclic aromatic hydrocarbons (PAHs) ceased did not stimulate significant decreases in the concentration of benzo[a]pyrene or dibenz[a,h]anthracene. However, pyrene was degraded to undetectable levels 21 days after its addition. The amount of benzo[a]pyrene and dibenz[a,h]anthracene degraded by strain VUN 10,003 was not affected by the initial concentration of the compounds when tested at 25-100 mg l-1, by the accumulation of by-products from pyrene catabolism or a loss of ability by the cells to catabolise benzo[a]pyrene or dibenz[a,h]anthracene. Metabolite or by-product repression was suspected to be responsible for the inhibition: By-products from the degradation of the five-ring compounds inhibited their further degradation.
History
Publication title
Journal of Industrial Microbiology and BiotechnologyVolume
28Pagination
88-96ISSN
1367-5435Department/School
College Office - College of Sciences and EngineeringPublisher
Springer-Verlag HeidelbergPlace of publication
Tiergartenstrasse 17, Heidelberg, Germany, D-69121Repository Status
- Restricted