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Identification of the Gene Encoding the Tryptophan Synthase beta -Subunit from Chlamydomonas reinhardtii1

Anthony L. Palombella2 and Susan K. Dutcher*

Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado 80309-0347

We report the isolation of a Chlamydomonas reinhardtii cDNA that encodes the beta -subunit of tryptophan synthase (TSB). This cDNA was cloned by functional complementation of a trp-operon-deleted strain of Escherichia coli. Hybridization analysis indicated that the gene exists in a single copy. The predicted amino acid sequence showed the greatest identity to TSB polypeptides from other photosynthetic organisms. With the goal of identifying mutations in the gene encoding this enzyme, we isolated 11 recessive and 1 dominant single-gene mutation that conferred resistance to 5-fluoroindole. These mutations fell into three complementation groups, MAA2, MAA7, and TAR1. In vitro assays showed that mutations at each of these loci affected TSB activity. Restriction fragment-length polymorphism analysis suggested that MAA7 encodes TSB. MAA2 and TAR1 may act to regulate the activity of MAA7 or its protein product.

1   This work was initiated with support from the National Institutes of Health (grant no. GM-32843 to S.K.D.) and finished with support from the National Science Foundation (grant no. DMB-8916641 to S.K.D.) A.L.P. was supported in part by a National Institutes of Health training grant (5T32 GM-07135).
2   Present address: Department of Biology, Monmouth University, West Long Branch, NJ 07764.
*   Corresponding author; e-mail dutcher{at}colorado.edu; fax 1-303-492-7744.

Plant Physiol. (1998) 117: 455-464
Copyright Clearance Center:   0032-0889/98/117/0455/10
© 1998 American Society of Plant Physiologists




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