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Appl. Environ. Microbiol., Nov 1997, 4287-4291, Vol 63, No. 11
Copyright © 1997, American Society for Microbiology

Indigo formation by microorganisms expressing styrene monooxygenase activity

KE O'Connor, AD Dobson and S Hartmans
Department of Food Science, Wageningen Agricultural University, The Netherlands.

The transformation of indole to indigo by microorganisms expressing styrene monooxygenase (SMO) has been studied. Styrene and indole are structurally very similar, and thus we looked at a variety of styrene- degrading strains for indole transformation to indigo. Two strains, Pseudomonas putida S12 and CA-3, gave a blue color on solid media when grown in the presence of indole. Indole induces its own transformation on solid media but is a poor inducer in liquid media. Styrene is the best inducer of indole transformation in both strains. Arginine represses styrene consumption and indigo formation rates in P. putida S12 compared to phenylacetic acid-grown cells, while the opposite effect is seen for P. putida CA-3. Characterization of an SMO- and styrene oxide isomerase (SOI)-negative transposon mutant of P. putida CA-3 and an SOI-negative N-methyl-N'-nitro-N-nitrosoguanidine mutant of P. putida S12 reveals the involvement of both SMO and SOI in indole transformation to indigo. Both strains stoichiometrically produce high- purity indigo from indole.

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