title: A sequence-specific endonuclease (Xmn I) from Xanthomonas manihotis.
abstract: A type II restriction endonuclease Xmn I with a novel site specificity has been isolated from Xanthomonas manihotis. Xmn I does not cleave SV40 DNA, but cleaves phi X174 DNA into three fragments, which constitute 76.61%, 18.08% and 5.31% of the total length of 5386 base pairs, and cleaves pBR322 DNA into two fragments of 55.71% and 44.29% of the entire 4362 base pairs. The nucleotide sequences around the cleavage sites made by Xmn I are not exactly homologous, but they have a common sequence of 5' GAANNNNTTC 3' according to a simple computer program analysis on nucleotide sequences of phi X174 DNA, pBR322 DNA and SV40 DNA. The results suggest that the cleavage site of Xmn I is located within its recognition sequence of 5' GAANNNNTTC 3'.
mesh_terms: D010584:Bacteriophage phi X 174; D001483:Base Sequence; D004262:DNA Restriction Enzymes / Q000378:metabolism*; D004279:DNA, Viral / Q000378:metabolism; D015252:Deoxyribonucleases, Type II Site-Specific; D004926:Escherichia coli / Q000235:genetics; D010957:Plasmids; D013539:Simian virus 40; D013379:Substrate Specificity; D014974:Xanthomonas / Q000201:enzymology*
chemical_list: D004279:DNA, Viral; D004262:DNA Restriction Enzymes; C028649:endodeoxyribonuclease XmnI; D015252:Deoxyribonucleases, Type II Site-Specific