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A Type III restriction-modification system in Mycoplasma mycoides subsp. capri. 2012

Mikkel A Algire, and Michael G Montague, and Sanjay Vashee, and Carole Lartigue, and Chuck Merryman
The J. Craig Venter Institute, 9704 Medical Center Drive, Rockville, MD 20850, USA. malgire@jcvi.org

The sequenced genome of Mycoplasma mycoides subsp. capri revealed the presence of a Type III restriction-modification system (MmyCI). The methyltransferase (modification) subunit of MmyCI (M.MmyCI) was shown to recognize the sequence 5'-TGAG-3' and methylate the adenine. The coding region of the methyltransferase gene contains 12 consecutive AG dinucleotide repeats that result in a translational termination at a TAA codon immediately beyond the repeat region. This strain does not have MmyCI activity. A clone was found with 10 AG repeats such that the gene is in frame, and this strain has MmyCI activity, suggesting that the expression of the MmyCI methyltransferase may be phase variable.

UI MeSH Term Description Entries
D009176 Mycoplasma mycoides The etiological agent of contagious pleuropneumonia (PLEUROPNEUMONIA, CONTAGIOUS) of cattle and goats.
D004269 DNA, Bacterial Deoxyribonucleic acid that makes up the genetic material of bacteria. Bacterial DNA
D001426 Bacterial Proteins Proteins found in any species of bacterium. Bacterial Gene Products,Bacterial Gene Proteins,Gene Products, Bacterial,Bacterial Gene Product,Bacterial Gene Protein,Bacterial Protein,Gene Product, Bacterial,Gene Protein, Bacterial,Gene Proteins, Bacterial,Protein, Bacterial,Proteins, Bacterial
D013379 Substrate Specificity A characteristic feature of enzyme activity in relation to the kind of substrate on which the enzyme or catalytic molecule reacts. Specificities, Substrate,Specificity, Substrate,Substrate Specificities
D015280 DNA Restriction-Modification Enzymes Systems consisting of two enzymes, a modification methylase and a restriction endonuclease. They are closely related in their specificity and protect the DNA of a given bacterial species. The methylase adds methyl groups to adenine or cytosine residues in the same target sequence that constitutes the restriction enzyme binding site. The methylation renders the target site resistant to restriction, thereby protecting DNA against cleavage. DNA Restriction Modification Enzyme,DNA Restriction-Modification Enzyme,Restriction Modification System,Restriction-Modification System,Restriction-Modification Systems,DNA Restriction Modification Enzymes,Restriction Modification Systems,Enzyme, DNA Restriction-Modification,Enzymes, DNA Restriction-Modification,Modification System, Restriction,Modification Systems, Restriction,Restriction-Modification Enzyme, DNA,Restriction-Modification Enzymes, DNA,System, Restriction Modification,System, Restriction-Modification,Systems, Restriction Modification,Systems, Restriction-Modification
D018900 Dinucleotide Repeats The most common of the microsatellite tandem repeats (MICROSATELLITE REPEATS) dispersed in the euchromatic arms of chromosomes. They consist of two nucleotides repeated in tandem; guanine and thymine, (GT)n, is the most frequently seen. Dinucleotide Repeat

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