What is Gateway cloning and what are its advantages?

Gateway cloning is a recombinational cloning system based on bacteriophage lambda site-specific recombination. It uses att sites (attB, attP, attL, attR) and recombinase enzymes to transfer DNA fragments between vectors without restriction enzymes or ligase. Entry clones containing genes flanked by attL sites recombine with destination vectors containing attR sites (LR reaction). Advantages include directional cloning, high efficiency, maintaining reading frame, and easy transfer between multiple destination vectors (different tags, hosts, promoters). MultiSite Gateway enables assembly of multiple fragments. It is widely used for high-throughput cloning.