Nucleic Acids Research, 1981, Vol. 9, No. 7 1743-1756
© 1981
MOLECULAR BIOLOGY |
Comparison of the nucleotide sequence of trpA and sequences immediately beyond the trp operon of Klebsiella aerogenes, Salmonella typhimurium and Escherichia coli
Department of Biological Sciences, Stanford University Stanford, CA 94305, USA
Received December 30, 1980.
The nucleotide sequence of trpA of Klebsiella aerogenes is presented and compared with the trpA sequences of Salmonella typhimurium and Escherichia coli. The majority of the approximately 200 differences between each pair of trpA's are single nucleotide pair changes that do not alter the amino acid sequence. Codon usage conforms to the general patterns revealed by examination of other prokaryotic gene sequences. However, codon usage in K. aerogenes trpA reflects the high G+C content of the genome of this organism. The DNA sequences just beyond trpA, the presumed transcription termination region, are also compared for the three species. Perusal of these sequences indicates that the secondary structure of the transcript segment just beyond trpA has been preserved, while the primary sequence has diverged appreciably.
*Present address: Department of Biological Sciences, University of Illinois at Chicago Circle, Box 4348, Chicago, IL 60680, USA
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