title: A bacterial methyltransferase M.EcoHK311 requires two proteins for in vitro methylation.
abstract: The genes encoding EcoHK311 restriction-modification (R-M) system were isolated from a clinically-isolated Escherichia coli strain HK31. The entire R-M system of EcoHK311 is located in a 2.1 kb fragment. R.EcoHK311 is an isoschizomer of Eael which recognizes and cleaves Y decreases GGCCR. M.EcoHK31l consists of two polypeptides alpha and beta with sizes 309 and 176 aa, respectively. Polypeptide beta is encoded within aa, alternative reading frame of polypeptide alpha. All the conserved motifs in mC5-MTases can be found in polypeptide alpha except motif IX which is present in polypeptide beta. Polypeptides alpha and beta were separately synthesized in a T7 promoter controlled over-expression system and in vitro methylation occurred only when the two extracts were mixed and thus confirms that two polypeptides are required for methylation.
authors.affiliation: Department of Biochemistry, Chinese University of Hong Kong.
authors.forename: K F
authors.initials: KF
authors.lastname: Lee
authors.forename: K M
authors.initials: KM
authors.lastname: Kam
authors.forename: P C
authors.initials: PC
authors.lastname: Shaw
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics / Q000378:metabolism; D015257:DNA-Cytosine Methylases / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D015252:Deoxyribonucleases, Type II Site-Specific / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D005798:Genes, Bacterial; D008745:Methylation; D008969:Molecular Sequence Data; D013379:Substrate Specificity
chemical_list: D001426:Bacterial Proteins; D017931:DNA Primers; D004269:DNA, Bacterial; C092246:DNA modification methylase EcoHK31I; D015257:DNA-Cytosine Methylases; D015252:Deoxyribonucleases, Type II Site-Specific; C037794:YGGCCR-specific type II deoxyribonucleases