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. 1991 Jan;173(2):541–548. doi: 10.1128/jb.173.2.541-548.1991

Nucleotide sequence and analysis of a gene encoding anthranilate synthase component I in Spirochaeta aurantia.

B Brahamsha 1, C Y Han 1, I P Crawford 1, E P Greenberg 1
PMCID: PMC207044  PMID: 1987149

Abstract

A Spirochaeta aurantia DNA fragment containing the trpE gene and flanking chromosomal DNA was cloned, and the sequence of the trpE structural gene plus 870 bp upstream and 1,257 bp downstream of trpE was determined. The S. aurantia trpE gene codes for a polypeptide of 482 amino acid residues with a predicted molecular weight of 53,629 that showed sequence similarity to TrpE proteins from other organisms. The S. aurantia TrpE polypeptide is not more closely related to the other published spirochete TrpE sequence (that of Leptospira biflexa) than to TrpE polypeptides of other bacteria. Two additional complete open reading frames and one partial open reading frame were identified in the sequenced DNA. One of the complete open reading frames and the partial open reading frame are upstream of trpE and are encoded on the DNA strand opposite that containing trpE. The other open reading frame is downstream of trpE and on the same DNA strand as trpE. On the basis of the results of a protein sequence data base search, it appears that trpE is the only tryptophan biosynthesis gene in the sequenced DNA. This is in contrast to L. biflexa, in which trpE is separated from trpG by only 64 bp.

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Selected References

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