NDLI: Evaluation of different phenol hydroxylase-possessing phenol-degrading pseudomonads by kinetic parameters

Content Provider	Springer Nature Link
Author	Viggor, Signe Heinaru, Eeva Künnapas, Allan Heinaru, Ain
Copyright Year	2008
Abstract	Phenol-degrading pseudomonads possessing different phenol hydroxylases (PH) were evaluated by the values of apparent half-saturation constant for phenol-oxygenating activity (K S ), maximum specific growth rate (μ max), lag-time length (λ), inhibition constant (K I ) and growth yield factor (Y X/S ). Strains of the same PH type showed similar kinetic parameters: single-component PH (sPH) harbouring strains had higher values of K S and lower values of μ max than the strains having multicomponent PH (mPH). However, the values of K I and the dependencies of the lag-time length on initial phenol concentration were strain-specific. The elevated ratio between specific activities of catechol 1,2-dioxygenase (C12O) and muconate cycloisomerase in sPH-strains caused irreversible accumulation of a high amount of exogenous cis,cis-muconate (CCM) which resulted in decreased Y X/S values. Co-presence of sPH and mPH genes did not give the strains PC16 and P69 any extra advantage and according to determined kinetic parameters only one PH was active during phenol degradation. At the same time simultaneous functioning of catechol ortho and meta cleavage pathways (strain PC20) resulted in higher μ max and Y X/S values. Evaluation of strains showed that the type of PH determined the efficiency of phenol degradation, whereas the tolerance to elevated phenol concentrations was strain-specific.
Starting Page	759
Ending Page	769
Page Count	11
File Format	PDF
ISSN	09239820
Journal	Biodegradation
Volume Number	19
Issue Number	5
e-ISSN	15729729
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-02-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Accumulation of cis,cis-muconate Biodegradation Growth kinetics Phenol hydroxylase Phenol-oxygenating activity Pseudomonads Waste Management/Waste Technology Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution Terrestrial Pollution Geochemistry Soil Science & Conservation Microbiology
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Environmental Engineering Bioengineering Microbiology

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