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Interference of laccase in determination of cellobiose dehydrogenase activity of Pleurotus ostreatus (Florida) using dichlorophenol indophenol as the electron acceptor
Author(s) -
Saha Tanima,
Chakraborty Tapas Kumar,
Saha Rina,
Das Nirmalendu,
Mukherjee Mina
Publication year - 2005
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.200410472
Subject(s) - laccase , cellobiose dehydrogenase , chemistry , indophenol , cellobiose , electron acceptor , substrate (aquarium) , pleurotus ostreatus , dehydrogenase , nuclear chemistry , biochemistry , enzyme , food science , cellulase , biology , ecology , mushroom
Pleurotus ostreatus (Florida), ITCC 3308 produces ∼9.0 U/ml extracellular cellobiose dehydrogenase (CDH) in cellulose medium after 7 days of growth. However, no activity could be detected if the assay was done with cellobiose as the substrate and 2,6‐dichlorophenol indophenol (DPIP) as the electron acceptor in absence of any laccase inhibitor. Kinetic study showed that V max / K m value was very high for rDPIP (reduced 2,6‐dichlrophenol indophenol) oxidation by laccase. Oxygen consumption rate of rDPIP oxidation by the enzyme was found to be highest among all the tested substrates. The present study indicated that rDPIP was a good substrate for laccase. Therefore, caution is needed to measure CDH activity by monitoring DPIP reduction in a system where laccase is likely to be present. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)