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Optimization of a f...
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Kim, ChangilUppsala universitet,Institutionen för cell- och molekylärbiologi
(författare)
Optimization of a fluorescent-mRNA based real-time assay for precise kinetic measurements of ribosomal translocation
- Artikel/kapitelEngelska2021
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2021-05-03
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Informa UK Limited,2021
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LIBRIS-ID:oai:DiVA.org:uu-396099
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-396099URI
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https://doi.org/10.1080/15476286.2021.1913312DOI
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Språk:engelska
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Sammanfattning på:engelska
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Authors in thesis list of papers: Kim, C., Holm, M., Sanyal, S.
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Kinetic characterization of ribosomal translocation is important for understanding the mechanism of elongation in protein synthesis. Here we have optimized a popular fluorescent-mRNA based translocation assay conducted in stopped-flow, by calibrating it with the functional tripeptide formation assay in quench-flow. We found that a fluorescently labelled mRNA, ten bases long from position +1 (mRNA+10), is best suited for both assays as it forms tripeptide at a fast rate equivalent to the longer mRNAs, and yet produces a large fluorescence change upon mRNA movement. Next, we compared the commonly used peptidyl tRNA analog, N-acetyl-Phe-tRNAPhe, with the natural dipeptidyl fMet-Phe-tRNAPhe in the stopped-flow assay. This analog translocates about two times slower than the natural dipeptidyl tRNA and produces biphasic kinetics. The rates reduce further at lower temperatures and with higher Mg2+ concentration, but improve with higher elongation factor G (EF-G) concentration, which increase both rate and amplitude of the fast phase significantly. In summary, we present here an improved real time assay for monitoring mRNA-translocation with the natural- and an N-Ac-analog of dipeptidyl tRNA.
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Holm, Mikael,1984-Uppsala universitet,Institutionen för cell- och molekylärbiologi(Swepub:uu)mikho346
(författare)
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Mandava, Chandra Sekhar,1978-Uppsala universitet,Molekylärbiologi(Swepub:uu)chsma839
(författare)
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Sanyal, SuparnaUppsala universitet,Molekylärbiologi(Swepub:uu)sucsa102
(författare)
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Uppsala universitetInstitutionen för cell- och molekylärbiologi
(creator_code:org_t)
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Ingår i:RNA Biology: Informa UK Limited18:12, s. 2363-23751547-62861555-8584
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