Transcriptional analysis of the threonine dehydrogenase gene of Xanthomonas campestris

被引:8
作者
Weng, SF [1 ]
Liu, YS [1 ]
Lin, JW [1 ]
Tseng, YH [1 ]
机构
[1] NATL CHUNGHSING UNIV, AGR BIOTECHNOL LABS, TAICHUNG 402, TAIWAN
关键词
D O I
10.1006/bbrc.1997.7686
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The nucleotide sequence has previously been determined for the Xanthomonas campestris pv. campestris gene coding for threonine dehydrogenase (tdh). Flanking this gene are the upstream region possessing promoter activity and the downstream perfect inverted repeat having potential to form a stem-loop structure which resembles a transcription terminator. In addition, Northern blot analysis suggested the transcript of this gene to be monocistronic. In the present study, the essential region for promoter activity was narrowed down to a stretch of 57 bp which still retained 84% of the promoter activity. The first nucleotide to be transcribed is the guanosine at 30 nt upstream from the proposed tdh start codon. The putative terminator exhibited transcriptional termination activity bidirectionally in both Escherichia coli and X. campestris. These observations indicate that the transcriptional structure of X. campestris tdh is different from that of E. coli where tdh and kbl are organized into the tdh operon. Furthermore, the expression of tdh in X. campestris is repressed by leucine, a situation different from that in E. coli where leucine induces the expression of tdh operon. (C) 1997 Academic Press.
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收藏
页码:523 / 529
页数:7
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