T7 replisome · mechanistic composite
Leading and lagging synthesis at the fork
A parental duplex reaches the T-shaped fork, where the leading template routes outside gp4 and the lagging template threads through its central channel. Opposed gp5–thioredoxin polymerases then show continuous leading synthesis beside four-nucleotide T7 priming, lagging-strand loop growth and release, and two emerging daughter duplexes.