title: Nucleotide sequence of the Agrobacterium tumefaciens octopine Ti plasmid-encoded tmr gene.
abstract: 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.
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant / Q000378:metabolism; D005796:Genes; D005798:Genes, Bacterial; D010957:Plasmids; D012333:RNA, Messenger / Q000235:genetics; D012231:Rhizobium / Q000235:genetics*; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000235:genetics*
chemical_list: D004274:DNA, Recombinant; D012333:RNA, Messenger; D014764:Viral Proteins; D004262:DNA Restriction Enzymes