Chapter title |
Site-Specific Fluorescent Labeling of Argonaute for FRET-Based Bio-Assays.
|
---|---|
Chapter number | 20 |
Book title |
Drug Target miRNA
|
Published in |
Methods in molecular biology, January 2017
|
DOI | 10.1007/978-1-4939-6563-2_20 |
Pubmed ID | |
Book ISBNs |
978-1-4939-6561-8, 978-1-4939-6563-2
|
Authors |
Sarah Willkomm, Adrian Zander, Dina Grohmann |
Editors |
Marco F. Schmidt |
Abstract |
Deciphering the molecular mechanisms of eukaryotic Argonaute proteins is crucial for the understanding of RNA interference (RNAi), a posttranscriptional gene silencing process. Fluorescence-based single-molecule studies like single-molecule Förster resonance energy transfer (FRET) between a donor and acceptor dye represent a versatile tool to gain a mechanistic understanding of the structural dynamics of a biomolecular complex. Until today it was not possible to site-specifically introduce fluorophores into eukaryotic Argonaute. Using an archaeal Argonaute variant from Methanocaldococcus jannaschii that closely resembles its eukaryotic counterpart, we site-specifically incorporated fluorescent probes into Argonaute. In this chapter, we first describe how to express archaeal Argonaute with the site-specifically engineered unnatural amino acid para-azido-L-phenylalanine (pAzF) and subsequently describe the coupling of a fluorophore exploiting the unique chemistry of the azide group of pAzF. In the second part of the chapter, we present a methodological approach that probes complex formation between acceptor-labeled archaeal Argonaute and guide and target nucleic acids equipped with a donor fluorophore which ultimately allows single-molecule FRET measurements. Furthermore we describe binding and cleavage assays that report on the functionality of Argonaute-nucleic acid complexes. |
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Unknown | 1 | 100% |
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Members of the public | 1 | 100% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Unknown | 33 | 100% |
Demographic breakdown
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Student > Ph. D. Student | 9 | 27% |
Student > Master | 7 | 21% |
Researcher | 5 | 15% |
Other | 2 | 6% |
Student > Bachelor | 2 | 6% |
Other | 3 | 9% |
Unknown | 5 | 15% |
Readers by discipline | Count | As % |
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Biochemistry, Genetics and Molecular Biology | 12 | 36% |
Agricultural and Biological Sciences | 7 | 21% |
Pharmacology, Toxicology and Pharmaceutical Science | 3 | 9% |
Chemistry | 2 | 6% |
Computer Science | 1 | 3% |
Other | 3 | 9% |
Unknown | 5 | 15% |