Modeling of the RAG reaction mechanism.

ABSTRACT: In vertebrate V(D)J recombination, it remains unclear how the RAG complex coordinates its catalytic steps with binding to two distant recombination sites. Here, we test the ability of the plausible reaction schemes to fit observed time courses for RAG nicking and DNA hairpin formation. The reaction schemes with the best fitting capability (1) strongly favor a RAG tetrameric complex over a RAG octameric complex; (2) indicate that once a RAG complex brings two recombination signal sequence (RSS) sites into synapsis, the synaptic complex rarely disassembles; (3) predict that the binding of both RSS sites (synapsis) occurs before catalysis (nicking); and (4) show that the RAG binding properties permit strong distinction between RSS sites within active chromatin versus nonspecific DNA or RSS si

SUBMITTER: Askary A 

PROVIDER: S-EPMC4010234 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature