Nucleotide sequence of the Agrobacterium tumefaciens octopine Ti plasmid-encoded tmr gene

F. Heidekamp, W.G. Dirkse, J. Hille, H. van Ormondt

Research output: Contribution to journalArticleAcademic

39 Citations (Scopus)
616 Downloads (Pure)


The nucleotide sequence of the tmr gene, encoded by the octopine Ti plasmid from Agrobacterium tumefaciens (pTiAch5), was determined. The T-DNA, which encompasses this gene, is involved in tumor formation and maintenance, and probably mediates the cytokinin-independent growth of transformed plant cells. The nucleotide sequence of the tmr gene displays a continuous open reading frame specifying a polypeptide chain of 240 amino acids. The 5'-terminus of the polyadenylated tmr mRNA isolated from octopine tobacco tumor cell lines was determined by nuclease S1 mapping. The nucleotide sequence 5'-TATAAAA-3', which sequence is identical to the canonical "TATA" box, was found 29 nucleotides upstream from the major initiation site for RNA synthesis. Two potential polyadenylation signals 5'-AATAAA-3' were found at 207 and 275 nucleotides downstream from the TAG stopcodon of the tmr gene. A comparison was made of nucleotide stretches, involved in transcription control of T-DNA genes.
Original languageEnglish
Number of pages13
JournalNucleic Acids Research
Issue number18
Publication statusPublished - 1983

Cite this