title: 4S oop RNA is a leader sequence for the immunity-establishment transcription in coliphage lambda.
abstract: oop RNA, which is initiated at the po promoter and is 81 nucleotides long, can function as a leader sequence for the lambda immunity establishment transcription, previously believed to originate at a special promoter pre located in the y region. Thus, oop RNA seems to have a dual role, either favouring the lytic cycle as a primer for the initiation of lambda DNA replication, or leading to the establishment of lysogeny when elongated into the imm transcript, which directs synthesis of the repressor.
mesh_terms: D003090:Coliphages / Q000378:metabolism*; D004261:DNA Replication; D004279:DNA, Viral / Q000096:biosynthesis; D005809:Genes, Regulator; D008242:Lysogeny; D012367:RNA, Viral / Q000096:biosynthesis* / Q000302:isolation & purification; D014158:Transcription, Genetic
chemical_list: D004279:DNA, Viral; D012367:RNA, Viral