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• W2161791247 endingPage "2555" @default.
• W2161791247 startingPage "2545" @default.
• W2161791247 abstract "ABSTRACT It is thought that the topology of a polytopic protein is generated by sequential translocation and membrane integration of independent signal-anchor and stop-transfer sequences. Two well-characterized cell-free systems (rabbit reticulocyte lysate and wheat germ extract) have been widely used to study the biogenesis of secretory and membrane proteins, but different results have been observed with proteins expressed in these two different systems. For example, different topologies of P-glycoprotein (Pgp) were observed in the two systems and the cause was thought to be the source of ribosomes. To understand how the ribosome is involved in dictating membrane translocation and orientation of polytopic proteins, individual signal-anchor sequences of Pgp were dissected and examined for their membrane targeting and translocation in a combined system of wheat germ ribosomes (WGR) and rabbit reticulocyte lysate (RRL). Addition of wheat germ ribosomes to the rabbit reticulocyte lysate translation system can enhance, reduce, or have no effect on the membrane targeting and translocation of individual Pgp signal-anchor sequences, and these effects appear to be determined by the amino acid residues flanking each signal-anchor. Ribosomes regulate the membrane targeting and translocation of Pgp signal-anchors in a polytopic form differently from the same signal-anchors in isolation. Furthermore, we demonstrated that ribosomes regulate the membrane targeting and translocation of each signal-anchor cotranslationally and that this activity of ribosomes is associated with the 60S subunit. Based on this and previous studies, we propose a mechanism by which ribosomes dynamically dictate the membrane targeting and translocation of nascent polytopic membrane proteins." @default.
• W2161791247 created "2016-06-24" @default.
• W2161791247 creator A5023363049 @default.
• W2161791247 creator A5034012906 @default.
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• W2161791247 date "2000-07-15" @default.
• W2161791247 modified "2023-10-12" @default.
• W2161791247 title "Role of the ribosome in sequence-specific regulation of membrane targeting and translocation of P-glycoprotein signal-anchor transmembrane segments" @default.
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• W2161791247 doi "https://doi.org/10.1242/jcs.113.14.2545" @default.
• W2161791247 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10862712" @default.
• W2161791247 hasPublicationYear "2000" @default.
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