title: DNA sequence of the 16S rRNA/23S rRNA intercistronic spacer of two rDNA operons of the archaebacterium Methanococcus vannielii.
abstract: The DNA sequence of the spacer (plus flanking) regions separating the 16S rRNA and 23S rRNA genes of two presumptive rDNA operons of the archaebacterium Methanococcus vannielii was determined. The spacers are 156 and 242 base pairs in size and they share a sequence homology of 49 base pairs following the 3' terminus of the 16S rRNA gene and of about 60 base pairs preceding the 5' end of the 23S rRNA gene. The 242 base pair spacer, in addition contains a sequence which can be transcribed into tRNAAla, whereas no tRNA-like secondary structure can be delineated from the 156 base pair spacer region. Almost complete sequence homology was detected between the end of the 16S rRNA gene and the 3' termini of either Escherichia coli or Halobacterium halobium 16S rRNA, whereas the putative 5' terminal 23S rRNA sequence shared partial homology with E. coli 23S rRNA and eukaryotic 5.8S rRNA.
mesh_terms: D001482:Base Composition; D001483:Base Sequence; D004247:DNA / Q000235:genetics*; D004275:DNA, Ribosomal; D004926:Escherichia coli / Q000235:genetics; D019605:Euryarchaeota / Q000235:genetics*; D005798:Genes, Bacterial; D006217:Halobacterium / Q000235:genetics; D009690:Nucleic Acid Conformation; D009876:Operon; D012335:RNA, Ribosomal / Q000235:genetics*; D013045:Species Specificity; D014158:Transcription, Genetic
chemical_list: D004275:DNA, Ribosomal; D012335:RNA, Ribosomal; D004247:DNA