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Journal of Bacteriology, June 2002, p. 3135-3141, Vol. 184, No. 11
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.11.3135-3141.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Functional Analysis of the Erwinia herbicola tutB Gene and Its Product

Takane Katayama,1 Hideyuki Suzuki,2 Takashi Koyanagi,2 and Hidehiko Kumagai2*

Applied Molecular Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture,1 Applied Molecular Microbiology, Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan2

Received 20 November 2001/ Accepted 14 March 2002

The tutB gene, which lies just downstream of tpl, has been cloned from Erwinia herbicola, and its product was analyzed. Despite its high sequence similarity to tryptophan transporters, TutB was found to be a tyrosine-specific transporter. Tryptophan acted as a competitive inhibitor of tyrosine transport. Unlike the tryptophanase operon, the tpl and tutB genes do not constitute an operon.

* Corresponding author. Mailing address: Applied Molecular Microbiology, Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan. Phone: 81-75-753-6276. Fax: 81-75-753-6275. E-mail: hidekuma{at}kais.kyoto-u.ac.jp.

Journal of Bacteriology, June 2002, p. 3135-3141, Vol. 184, No. 11
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.11.3135-3141.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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