Biochemical and mutational analysis of EcoRII functional domains reveals evolutionary links between restriction enzymes.
The archetypal Type IIE restriction endonuclease EcoRII is a dimer that has a modular structure. DNA binding studies indicate that the isolated C-terminal domain dimer has an interface that binds a single cognate DNA molecule whereas the N-terminal domain is a monomer that also binds a single copy of cognate DNA. Hence, the full-length EcoRII contains three putative DNA binding interfaces: one at the C-terminal domain dimer and two at each of the N-terminal domains. Mutational analysis indicates that the C-terminal domain shares conserved active site architecture and DNA binding elements with the tetrameric restriction enzyme NgoMIV. Data provided here suggest possible evolutionary relationships between different subfamilies of restriction enzymes.
Institute of Biotechnology, Graiciuno 8, Vilnius LT-02241, Lithuania.
Gintautas
G
Tamulaitis
Merlind
M
Mucke
Virginijus
V
Siksnys
D020816:Amino Acid Motifs; D001665:Binding Sites / Q000235:genetics / Q000502:physiology; D020134:Catalytic Domain / Q000235:genetics / Q000502:physiology; D002850:Chromatography, Gel; D017124:Conserved Sequence; D004247:DNA / Q000737:chemistry; D004252:DNA Mutational Analysis; D004262:DNA Restriction Enzymes / Q000737:chemistry* / Q000235:genetics; D015252:Deoxyribonucleases, Type II Site-Specific / Q000737:chemistry* / Q000235:genetics; D019143:Evolution, Molecular; D008969:Molecular Sequence Data; D017434:Protein Structure, Tertiary
D004247:DNA; D004262:DNA Restriction Enzymes; C046545:CCWGG-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific; C413605:NgoMIV endonuclease