2hof
From Proteopedia
Crystal structure of the pre-cleavage synaptic complex in the cre-loxp site-specific recombination
Structural highlights
FunctionRECR_BPP1 Catalyzes site-specific recombination between two 34-base-pair LOXP sites. Its role is to maintain the phage genome as a monomeric unit-copy plasmid in the lysogenic state. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedCre recombinase catalyzes site-specific recombination between 34-bp loxP sites in a variety of topological and cellular contexts. An obligatory step in the recombination reaction is the association, or synapsis, of Cre-bound loxP sites to form a tetrameric protein assembly that is competent for strand exchange. Using analytical ultracentrifugation and electrophoresis approaches, we have studied the energetics of Cre-mediated synapsis of loxP sites. We found that synapsis occurs with a high affinity (Kd = 10 nM) and is pH-dependent but does not require divalent cations. Surprisingly, the catalytically inactive Cre K201A mutant is fully competent for synapsis of loxP sites, yet the inactive Y324F and R173K mutants are defective for synapsis. These findings have allowed us to determine the first crystal structures of a pre-cleavage Cre-loxP synaptic complex in a configuration representing the starting point in the recombination pathway. When combined with a quantitative analysis of synapsis using loxP mutants, the structures explain how the central 8 bp of the loxP site are able to dictate the order of strand exchange in the Cre system. Synapsis of loxP sites by Cre recombinase.,Ghosh K, Guo F, Van Duyne GD J Biol Chem. 2007 Aug 17;282(33):24004-16. Epub 2007 Jun 15. PMID:17573343[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
| ||||||||||||||||||
