Domain: Xer

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When bacteria replicate their circular DNA, homologous recombination can occasionally link the two new circles into one large, double-sized loop (a dimer). Without a way to cut this loop back into two separate monomers, the cell cannot properly segregate its DNA into daughter cells, leading to cell death or genomic instability. The Xer domain proteins provide the surgical precision needed to break and rejoin these DNA strands at a specific 28-base-pair site called . Protein Architecture & Function xer domain

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The Xer domain plays a central role in the site-specific recombination reaction, which involves the exchange of genetic material between two DNA molecules. The Xer recombinase enzyme, which contains the Xer domain, catalyzes the recombination reaction by: The Xer domain proteins provide the surgical precision