Cytosine methylation of the sequence GATC in a mycoplasma.
AUTOR(ES)
Dybvig, K
RESUMO
Mycoplasma virus L2 is subject to host-specific restriction and modification in Acholeplasma laidlawii strains JA1 and K2. We have examined the DNAs from both host cells and viruses propagated on these strains with respect to susceptibility to cleavage by restriction endonucleases and for DNA base modifications. We show that, in strain K2 and L2 virus grown on K2 cells, cytosine in the sequence GATC is methylated to 5-methylcytosine and, although strain K2 and L2 viruses grown on K2 contain N6-methyladenine in their DNA, adenine in the sequence GATC is not methylated. In contrast to K2, strain JA1 and L2 virus grown on JA1 cells contain no detectable methylated bases. It is not known which of the methylated bases in K2 is the basis for the K2 restriction-modification system operative on L2 virus.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=220423Documentos Relacionados
- Rheotactic behavior of a gliding mycoplasma.
- Ribosomal RNA genes in Mycoplasma.
- Methylation of either cytosine in the recognition sequence CGCG inhibits ThaI cleavage of DNA.
- Arrangement of Dam methylation sites (GATC) in the Escherichia coli chromosome.
- Influence of fixation on gross morphology of Mycoplasma.
