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terminase small subunit
Packaging of double-stranded viral DNA concatemers requires interaction of the prohead with virus DNA. This process is mediated by a phage-encoded DNA recognition and terminase protein. The terminase enzymes described so far, which are hetero-oligomers composed of a small and a large subunit, do not have a significant level of sequence homology. The small terminase subunit is thought to form a nucleoprotein structure that helps to position the terminase large subunit at the packaging initiation site [1]. [1]. 2679356. DNA packaging in dsDNA bacteriophages.. Black LW;. Annu Rev Microbiol 1989;43:267-292. (from Pfam)
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