alexa Identification of two flavin monooxygenases from an effluent treatment plant sludge metagenomic library.


Industrial Engineering & Management

Author(s): Singh A, Singh Chauhan N, Thulasiram HV, Taneja V, Sharma R

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Abstract Oxygenases are useful for the production of many industrially important molecules. Screening of an effluent treatment plant (ETP) sludge metagenomic library identified two clones encoding proteins, B1 and B2, with similarity to putative flavin monooxygenases from Mesorhizobium loti and Sphingomonas wittichi, respectively. The deduced amino acid sequences show only 20\% identity, but both have a paired Rossman fold and a flavin monooxygenase (FMO) motif. B1 and B2 appear to be members of the flavin-containing monooxygenase and the Baeyer-Villiger monooxygenases subfamilies, respectively. When expressed in Escherichia coli, the two clones produced activities that oxidized indole to a mixture of indigo and indirubin pigments. These results suggest that B1 and B2 have potential as a biocatalyst in indigo/indirubin production. Copyright 2010 Elsevier Ltd. All rights reserved. This article was published in Bioresour Technol and referenced in Industrial Engineering & Management

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