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Journal of Bacteriology, April 1999, p. 2513-2518, Vol. 181, No. 8
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Saturation Mutagenesis of the TATA Box and Upstream Activator Sequence in the Haloarchaeal bop Gene Promoter

Nitin S. Baliga and Shiladitya DasSarma*

Department of Microbiology, University of Massachusetts, Amherst, Massachusetts 01003

Received 26 August 1998/Accepted 4 February 1999

Degenerate oligonucleotides were used to randomize 21 bp of the 53-bp minimal bop promoter in three 7-bp segments, including the putative TATA box and the upstream activator sequence (UAS). The mutagenized bop promoter and the wild-type structural gene and transcriptional terminator were inserted into a shuttle plasmid capable of replication in the halophilic archaeon Halobacterium sp. strain S9. Active promoters were isolated by screening transformants of an orange (Pum- bop) Halobacterium mutant for purple (Pum+ bop+) colonies on agar plates and analyzed for bop mRNA and/or bacteriorhodopsin content. Sequence analysis yielded the consensus sequence 5'-tyT(T/a)Ta-3', corresponding to the promoter TATA box element 30 to 25 bp 5' of the transcription start site. A putative UAS, 5'-ACCcnactagTTnG-3', located 52 to 39 bp 5' of the transcription start site was found to be conserved in active promoters. This study provides direct evidence for the requirement of the TATA box and UAS for bop promoter activity.

* Corresponding author. Mailing address: Department of Microbiology, 203 Morrill Science Center IV-N, University of Massachusetts, Amherst, MA 01003. Phone: (413) 545-2581. Fax: (413) 545-1578. E-mail: dassarma{at}microbio.umass.edu.

Journal of Bacteriology, April 1999, p. 2513-2518, Vol. 181, No. 8
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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Copyright © 1999 by the American Society for Microbiology. All rights reserved.