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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of transcription and processing signals of the 16S–23S rRNA operon of Mycoplasma hyopneumoniae (1986)
    Springer
    Molecular genetics and genomics 205 (1986), S. 434-441 
    Details
    ISSN: 1617-4623
    Keywords: Mycoplasma hyopneumoniae ; Ribosomal RNA genes ; Promoter ; rRNA Processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The 16S and 23S rRNA genes of Mycoplasma hyopneumoniae are closely spaced in one operon. The two genes are separated by a spacer region of 500 bp which shown no sequence homology to bacterial tRNA genes. Within this operon seven 5′ and five 3′ ends of various rRNA species were mapped and the corresponding DNA was sequenced. The results are consistent with the following model for synthesis of rRNAs: Transcription of the operon is initiated from either of two tandemly arranged promoters leading to a large precursor RNA consisting of both 16S and 23S rRNAs. This primary transcript is first cleaved within stem structures surrounding the two rRNAs to yield premature 16S and 23S rRNAs. By further processing events the mature 5′ and 3′ ends are generated. The promoter sequences of this operon differ from those of other eubacterial promoters in lacking the typical -35 region. The putative termination site at the 3′ end of the operon is reminiscent of rho-independent terminators in Escherichia coli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338079
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of transcription and processing signals in the 5′ regions of the two Mycoplasma capricolum rRNA operons (1988)
    Springer
    Molecular genetics and genomics 212 (1988), S. 522-530 
    Details
    ISSN: 1617-4623
    Keywords: Mycoplasma capricolum ; Ribosomal RNA operon ; Promoter ; RNA processing ; Transfer RNA genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The transcription and RNA processing signals of the rRNA operons (rrnA and rrnB) of Mycoplasma capricolum were analyzed by mapping the 5′ ends of in vivo and in vitro synthesized RNAs. The results of both in vitro and in vivo analyses point to the rrnA operon being transcribed from two promoters (P1 and P2) into large precursor RNAs. Transcripts initiating at P1 contain two tRNAs, and probably 16 S, 23 S, and 5 S rRNAs, whereas the transcripts starting from P2 consist only of the three rRNAs. The precursor RNAs are processed via distinct intermediates into mature tRNAs and rRNAs. In vivo experiments indicated that the rrnB operon is transcribed only from one promoter, although a second promoter could be identified using cell free extracts. The rrnB operon does not contain tRNA genes, but the precursor is still processed in the same way as the rrnA precursor that is synthesized from P2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330859
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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