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Iteron
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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Das Iteron bezeichnet eine DNA-Sequenz in manchen bakteriellen Plasmiden und einigen Viren, an die der Initiator der Replikation Rep bindet und die Replikation des Plasmids beeinflusst. Die Regulation der Replikation durch Iterons ist ein Mechanismus zur Begrenzung der Plasmidkopieanzahl, z. B. zur Vermeidung einer ΓΌbermΓ€Γigen Genexpression der Gene auf dem Plasmid.
Contents
β’ Eigenschaften
β’ Einzelnachweise
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Eigenschaften
Ein Iteron liegt innerhalb des Replikationsursprungs des Plasmids und besteht aus etwa fΓΌnf bis sieben Wiederholungen einer Sequenz von etwa 22 Basenpaaren.cite-ref-1[1] Durch die Bindung von Rep wird die Replikation des Plasmids eingeleitet.cite-ref-2[2] Weiterhin kontrollieren Iterons auch die Genexpression von Rep und regulieren die HΓ€ufigkeit der Einleitung einer Replikation.cite-ref-3[3]
Iterons, Antisense-RNA und ctRNA sind bakterielle Mechanismen zur BeschrΓ€nkung der Plasmidkopieanzahl.
Einzelnachweise
cite-note-22. β R. Giraldo, M. E. FernΓ‘ndez-Tresguerres: Twenty years of the pPS10 replicon: insights on the molecular mechanism for the activation of DNA replication in iteron-containing bacterial plasmids. In: Plasmid. Band 52, Nummer 2, September 2004, S. 69β83, ISSN 0147-619X. doi:10.1016/j.plasmid.2004.06.002. PMID 15336485.