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Identification and Functional Characterization of Sphingomonas macrogolitabida Strain TFA Genes Involved in the First Two Steps of the Tetralin Catabolic Pathway

Emilia Moreno-Ruiz, María José Hernáez, Olga Martínez-Pérez, and Eduardo Santero^*

Departamento de Genética, Facultad de Biología, Universidad de Sevilla, Seville, Spain

Received 7 August 2002/ Accepted 19 December 2002

Five genes involved in the two initial steps of the tetralin biodegradation pathway of Sphingomonas macrogolitabida strain TFA have been characterized. ThnA1A2 and ThnA3A4, components of the ring-hydroxylating dioxygenase, were encoded in divergently transcribed operons. ThnA1, ThnA2, and ThnA3 were essential for tetralin ring-hydroxylating dioxygenase activity. ThnB was identified as a dehydrogenase required for tetralin biodegradation.

Present address: Laboratorio Andaluz de Biología, Universidad Pablo de Olavide, Seville, Spain.

Present address: Instituto Valenciano de Infertilidad, Seville, Spain.

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