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YqaJ protein domain : ウィキペディア英語版 | YqaJ protein domain
In molecular biology, the YqaJ refers to the YqaJ/K domain from the ''skin'' prophage of the bacterium, ''Bacillus subtilis''. This protein domain, often found in bacterial species, is actually of viral origin. The protein forms an oligomer and functions as an alkaline exonuclease, or in simpler terms, an enzyme that digests double-stranded DNA. It is a reaction which is dependent on Magnesium. It has a preference for 5'-phosphorylated DNA ends. It thus forms part of the two-component SynExo viral recombinase functional unit. ==Function== The function of this protein domain is to digest DNA. Most viruses, inject their host with linear DNA, and this gets incorporated into the host genome through the process of recombination. This recombination is crucial to viral replication.〔 DNA exonucleases have roles to play in DNA metabolism, such as: replication, repair, and recombination.
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