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  Three-dimensional reconstruction of Trypanosoma brucei editosomes using single-particle electron microscopy.

Göringer, H. U., Stark, H., Böhm, C., Sander, B., & Golas, M. M. (2011). Three-dimensional reconstruction of Trypanosoma brucei editosomes using single-particle electron microscopy. In R. Aphasizhev (Ed.), RNA and DNA editing: Methods and protocols (pp. 3-22). New York: Humana Pr.; Springer.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0011-568E-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-1A79-F
Genre: Book Chapter

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 Creators:
Göringer, H. U., Author
Stark, H.1, Author              
Böhm, C., Author
Sander, B., Author
Golas, M. M., Author
Affiliations:
1Research Group of 3D Electron Cryo-Microscopy, MPI for biophysical chemistry, Max Planck Society, ou_578577              

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Free keywords: RNA editing - Editosome - Trypanosoma brucei - Tandem-affinity purification (TAP) - GraFix - Surface plasmon resonance (SPR) - Density gradient centrifugation - Electron microscopy (EM) - Cryo-EM - Single-particle image processing
 Abstract: RNA editing within the mitochondria of kinetoplastid protozoa is performed by a multicomponent ­macromolecular machine known as the editosome. Editosomes are high molecular mass protein assemblies that consist of about 15–25 individual polypeptides. They bind pre-edited transcripts and convert them into translation-competent mRNAs through a biochemical reaction cycle of enzyme-catalyzed steps. At steady-state conditions, several distinct complexes can be purified from mitochondrial detergent lysates. They likely represent RNA editing complexes at different assembly stages or at different functional stages of the processing reaction. Due to their low cellular abundance, single-particle electron microscopy (EM) represents the method of choice for their structural characterization. This chapter describes a set of techniques suitable for the purification and structural characterization of RNA editing complexes by single-particle EM. The RNA editing complexes are isolated from the endogenous pool of mitochondrial complexes by tandem-affinity purification (TAP). Since the TAP procedure results in the isolation of a mixture of different RNA editing complexes, the isolates are further subjected to an isokinetic ultracentrifugation step to separate the complexes based on their sedimentation behavior. The use of the “GraFix” protocol is presented that combines mild chemical cross-linking with ultracentrifugation. Different sample preparation protocols including negative staining, cryo-negative staining, and unstained cryotechniques as well as the single-particle image processing of electron microscopical images are described.

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Language(s): eng - English
 Dates: 2011-04-01
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1007/978-1-61779-018-8_1
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Title: RNA and DNA editing: Methods and protocols
Source Genre: Book
 Creator(s):
Aphasizhev, R., Editor
Affiliations:
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Publ. Info: New York : Humana Pr.; Springer
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 3 - 22 Identifier: ISBN: 978-1-61779-017-1

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Title: Methods in molecular biology
Source Genre: Series
 Creator(s):
Walker, J.M., Editor
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Publ. Info: -
Pages: - Volume / Issue: 718 Sequence Number: - Start / End Page: - Identifier: -