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- W2009226410 abstract "The time course of polysome formation was studied in a long-term wheat germ cell-free translation system using sedimentation and electron microscopy techniques. The polysomes were formed on uncapped luciferase mRNA with translation-enhancing 5′ and 3′ UTRs. The formation of fully loaded polysomes was found to be a long process that required many rounds of translation and proceeded via several phases. First, short linear polysomes containing no more than six ribosomes were formed. Next, folding of these polysomes into short double-row clusters occurred. Subsequent gradual elongation of the clusters gave rise to heavy-loaded double-row strings containing up to 30–40 ribosomes. The formation of the double-row polysomes was considered to be equivalent to circularization of polysomes, with antiparallel halves of the circle being laterally stuck together by ribosome interactions. A slow exchange with free ribosomes and free mRNA observed in the double-row type polysomes, as well as the resistance of translation in them to AMP-PNP, provided evidence that most polysomal ribosomes reinitiate translation within the circularized polysomes without scanning of 5′ UTR, while de novo initiation including 5′ UTR scanning proceeds at a much slower rate. Removal or replacements of 5′ and 3′ UTRs affected the initial phase of translation, but did not prevent the formation of the double-row polysomes during translation." @default.
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- W2009226410 date "2008-02-29" @default.
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- W2009226410 title "Step-wise formation of eukaryotic double-row polyribosomes and circular translation of polysomal mRNA" @default.
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- W2009226410 doi "https://doi.org/10.1093/nar/gkm1177" @default.
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