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Journal of Bacteriology, August 2000, p. 4625-4627, Vol. 182, No. 16
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Role of the yiaR and yiaS Genes of Escherichia coli in Metabolism of Endogenously Formed L-Xylulose

Ester Ibañez, Rosa Gimenez, Tomas Pedraza, Laura Baldoma, Juan Aguilar, and Josefa Badia*

Department of Biochemistry, School of Pharmacy, University of Barcelona, 08028 Barcelona, Spain

Received 12 February 2000/Accepted 2 June 2000

Genes yiaP and yiaR of the yiaKLMNOPQRS cluster of Escherichia coli are required for the metabolism of the endogenously formed L-xylulose, whereas yiaS is required for this metabolism only in araD mutants. Like AraD, YiaS was shown to have L-ribulose-5-phosphate 4-epimerase activity. Similarity of YiaR to several 3-epimerases suggested that this protein could catalyze the conversion of L-xylulose-5-phosphate into L-ribulose-5-phosphate, thus completing the pathway between L-xylulose and the general metabolism.

* Corresponding author. Mailing address: Departamento de Bioquímica, Facultad de Farmacia, Universidad de Barcelona, Avda. Diagonal 643, 08028 Barcelona, Spain. Phone: 34-93-402 4521. Fax: 34-93-402 1896. E-mail: Palaciu{at}farmacia.far.ub.es.

Journal of Bacteriology, August 2000, p. 4625-4627, Vol. 182, No. 16
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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