Viral DNA that does not become integrated can undergo another fate, which is to have the two viral DNA ends joined together to form a 2-LTR circle. This reaction requires Ku, XRCC4 and ligase 4.
Bushman, FD, Lewinski, MK
Varmus, HE, Hughes, SH, Coffin, JM
DNA ligase activity of viral DNA:Ku proteins:XRCC4:DNA ligase IV complex [nucleoplasm]
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