Pseudomonas sp. strain HBP1 Prp degrades 2-isopropylphenol (ortho-cumenol) via meta cleavage.
Pseudomonas sp. strain HBP1 Prp grew on 2-isopropylphenol as the sole carbon and energy source with a maximal specific growth rate of 0.14 h-1 and transient accumulation of isobutyric acid. Oxygen uptake experiments with resting cells and enzyme assays with crude-cell extracts showed that 2-isopropylphenol was catabolized via a broad-spectrum meta cleavage pathway. These findings were confirmed by experiments with partially purified enzymes. Identification of 3-isopropylcatechol and 2-hydroxy-6-oxo-7-methylocta-2,4-dienoic acid as the products of the initial monooxygenase reaction and the subsequent extradiol ring cleavage dioxygenase reaction, respectively, was based on gas chromatography-mass spectrometry analysis of the corresponding trimethylsilyl derivatives. The meta cleavage product hydrolase hydrolyzed 2-hydroxy-6-oxo-7-methylocta-2,4-dienoic acid (meta cleavage product of 2-isopropylphenol) to isobutyric acid and 2-hydroxypent-2,4-dienoic acid.
Reichlin
F
F
Swiss Federal Institute for Environmental Sciences and Technology (EAWAG), Dübendorf.
Kohler
H P
HP
D001673:Biodegradation, Environmental; D002396:Catechols / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D006867:Hydrolases / Q000378:metabolism; D016015:Logistic Models; D010101:Oxygen Consumption; D010105:Oxygenases / Q000378:metabolism; D010636:Phenols / Q000378:metabolism*; D011549:Pseudomonas / Q000378:metabolism*
D002396:Catechols; D010636:Phenols; C091238:2-isopropylphenol; D010105:Oxygenases; D006867:Hydrolases