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  Mapping protein interactions in the active TOM-TIM23 supercomplex

Gomkale, R., Linden, A., Neumann, P., Schendzielorz, A. B., Stoldt, S., Dybkov, O., et al. (2021). Mapping protein interactions in the active TOM-TIM23 supercomplex. Nature Communications, 12: 5715. doi:10.1038/s41467-021-26016-1.

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Gomkale, R., Autor
Linden, A.1, Autor           
Neumann, P., Autor
Schendzielorz, A. B., Autor
Stoldt, S.2, Autor           
Dybkov, O.3, Autor           
Kilisch, M., Autor
Schulz, C., Autor
Cruz-Zaragoza, L. D., Autor
Schwappach, B., Autor
Ficner, R., Autor
Jakobs, S.2, Autor           
Urlaub, H.1, Autor           
Rehling, P.4, Autor           
Affiliations:
1Research Group of Bioanalytical Mass Spectrometry, MPI for Biophysical Chemistry, Max Planck Society, ou_578613              
2Research Group of Mitochondrial Structure and Dynamics, MPI for Biophysical Chemistry, Max Planck Society, ou_578566              
3Department of Cellular Biochemistry, MPI for Biophysical Chemistry, Max Planck Society, ou_578576              
4Max Planck Fellow Peter Rehling, ou_1298545              

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Schlagwörter: Membrane proteins; Mitochondria; Mitochondrial proteins; Molecular modelling; Protein translocation
 Zusammenfassung: Nuclear-encoded mitochondrial proteins destined for the matrix have to be transported across two membranes. The TOM and TIM23 complexes facilitate the transport of precursor proteins with N-terminal targeting signals into the matrix. During transport, precursors are recognized by the TIM23 complex in the inner membrane for handover from the TOM complex. However, we have little knowledge on the organization of the TOM-TIM23 transition zone and on how precursor transfer between the translocases occurs. Here, we have designed a precursor protein that is stalled during matrix transport in a TOM-TIM23-spanning manner and enables purification of the translocation intermediate. Combining chemical cross-linking with mass spectrometric analyses and structural modeling allows us to map the molecular environment of the intermembrane space interface of TOM and TIM23 as well as the import motor interactions with amino acid resolution. Our analyses provide a framework for understanding presequence handover and translocation during matrix protein transport.

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Sprache(n): eng - English
 Datum: 2021-09-29
 Publikationsstatus: Online veröffentlicht
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1038/s41467-021-26016-1
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Titel: Nature Communications
Genre der Quelle: Zeitschrift
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Seiten: 17 Band / Heft: 12 Artikelnummer: 5715 Start- / Endseite: - Identifikator: ISSN: 2041-1723