title: A novel repetitive sequence lies near the gene encoding a cytosine methyltransferase in the cyanobacterium Dactylococcopsis salina.
abstract: An unusual cluster of tandemly repeated DNA sequences (TRS) was found downstream from the gene encoding DsaV methyltransferase, the DNA modification enzyme in the DsaV restriction-modification system found in a strain of Dactylococcopsis salina (Ds). The repeat unit is about 32-bp long and is present 13 times in the cluster. Each repeat unit can be divided into two distinct parts based on the level of sequence conservation and evolution. Hybridization of Ds DNA with a probe specific for this cluster revealed that there were at least two additional sites within the genome with similar TRS. The TRS units are localized in one region of the Ds genome. They do not share significant sequence similarity with other TRS found in prokaryotes.
authors.affiliation: Department of Chemistry, Wayne State University, Detroit, MI 48202, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Yebra
authors.forename: A S
authors.initials: AS
authors.lastname: Bhagwat
mesh_terms: D001482:Base Composition; D001483:Base Sequence; D015139:Blotting, Southern; D000458:Cyanobacteria / Q000201:enzymology / Q000235:genetics*; D015257:DNA-Cytosine Methylases / Q000235:genetics*; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D012091:Repetitive Sequences, Nucleic Acid; D015183:Restriction Mapping; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity
chemical_list: C090447:DNA modification methylase DsaV; D015257:DNA-Cytosine Methylases; C061224:endodeoxyribonuclease PvuI; D015252:Deoxyribonucleases, Type II Site-Specific