title: Organization and sequence of the SalI restriction-modification system.
abstract: The organization and nucleotide (nt) sequences were determined for the genes encoding the SalI restriction and modification (R-M) system (recognition sequence 5'-GTCGAC-3') from Streptomyces albus G. The system comprises two genes, salIR, coding for the restriction endonuclease (ENase, R.SalI; probably 315 amino acids (aa), a predicted M(r) of 35,305; product, G'TCGAC) and salIM, coding for the methyltransferase (MTase, M.SalI; probably 587 aa, a predicted M(r) of 64,943; product, GTCGm6AC). The genes are adjacent, they have the same orientation, and they occur in the order salIR then salIM. R.SalI contains a putative magnesium-binding motif similar to those at the active sites of R.EcoRI and R.EcoRV, but otherwise it bears little aa sequence similarity to other ENases. M.SalI is a member of the m6A gamma class of MTases. In aa sequence it resembles M.AccI, another m6A gamma-MTase whose recognition sequence includes the SalI recognition sequence as a subset.
authors: Departamento de Biologia Funcional, Universidad de Oviedo, Spain.
authors: M R
authors: MR
authors: Rodicio
authors: T
authors: T
authors: Quinton-Jager
authors: L S
authors: LS
authors: Moran
authors: B E
authors: BE
authors: Slatko
authors: G G
authors: GG
authors: Wilson
mesh_terms: D000595:Amino Acid Sequence; D001482:Base Composition; D001483:Base Sequence; D002874:Chromosome Mapping; D003062:Codon; D015252:Deoxyribonucleases, Type II Site-Specific / Q000096:biosynthesis / Q000235:genetics*; D005798:Genes, Bacterial; D005809:Genes, Regulator; D008969:Molecular Sequence Data; D012045:Regulatory Sequences, Nucleic Acid; D015183:Restriction Mapping; D017386:Sequence Homology, Amino Acid; D015265:Site-Specific DNA-Methyltransferase (Adenine-Specific) / Q000096:biosynthesis / Q000235:genetics*; D013302:Streptomyces / Q000201:enzymology* / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D003062:Codon; C059634:DNA modification methylase SalGI; D015265:Site-Specific DNA-Methyltransferase (Adenine-Specific); D015252:Deoxyribonucleases, Type II Site-Specific; C029792:GTCGAC-specific type II deoxyribonucleases