Type I restriction endonucleases are true catalytic enzymes
نویسندگان
چکیده
منابع مشابه
Type I restriction endonucleases are true catalytic enzymes
Type I restriction endonucleases are intriguing, multifunctional complexes that restrict DNA randomly, at sites distant from the target sequence. Restriction at distant sites is facilitated by ATP hydrolysis-dependent, translocation of double-stranded DNA towards the stationary enzyme bound at the recognition sequence. Following restriction, the enzymes are thought to remain associated with the...
متن کاملMechanistic insight into Type I restriction endonucleases.
Restriction and modification are two opposing activities that are used to protect bacteria from cellular invasion by DNA (e.g. bacteriophage infection). Restriction activity involves cleavage of the DNA; while modification activity is the mechanism used to "mark" host DNA and involves DNA methylation. The study of Type I restriction enzymes has often been seen as an esoteric exercise and this ...
متن کاملThe type IIB restriction endonucleases.
The endonucleases from the Type IIB restriction-modification systems differ from all other restriction enzymes. The Type IIB enzymes cleave both DNA strands at specified locations distant from their recognition sequences, like Type IIS nucleases, but they are unique in that they do so on both sides of the site, to liberate the site from the remainder of the DNA on a short duplex. The fact that ...
متن کاملType I restriction enzymes and their relatives
Type I restriction enzymes (REases) are large pentameric proteins with separate restriction (R), methylation (M) and DNA sequence-recognition (S) subunits. They were the first REases to be discovered and purified, but unlike the enormously useful Type II REases, they have yet to find a place in the enzymatic toolbox of molecular biologists. Type I enzymes have been difficult to characterize, bu...
متن کاملTension-dependent DNA cleavage by restriction endonucleases: two-site enzymes are "switched off" at low force.
DNA looping occurs in many important protein-DNA interactions, including those regulating replication, transcription, and recombination. Recent theoretical studies predict that tension of only a few piconewtons acting on DNA would almost completely inhibit DNA looping. Here, we study restriction endonucleases that require interaction at two separated sites for efficient cleavage. Using optical ...
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ژورنال
عنوان ژورنال: Nucleic Acids Research
سال: 2009
ISSN: 1362-4962,0305-1048
DOI: 10.1093/nar/gkp195