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Funding Organization(s): Chan Zuckerberg Initiative, German Research Foundation (DFG), Ministry of Science and Technology (MoST, China), Independent Research Fund Denmark - Medical Sciences
Primary Citation Related Structures: 9SLC, 9SLF, 9SMD
PubMed Abstract:
Cryo-electron tomography has emerged as a powerful technology for in-cell structural biology and, in combination with breakthroughs in protein structure prediction, offers a unique opportunity for illuminating functions of previously uncharacterized macromolecular complexes. Here, we used the genome-reduced bacterium Mycoplasma pneumoniae as a minimal cell model and determined in-cell maps of an unknown complex located at the cell surface. By combining proteomics, structure prediction, integrative modeling, and bioinformatics, we identified the complex to include the conserved Sec-translocon and an extracellular dome-like structure largely formed by three uncharacterized proteins (Mdps). The Mdps show structural homology to the periplasmic ATP-independent foldase PrsA, with Mdp444 retaining key catalytic residues and activity. Our study provides the first sub-nanometer-resolution maps of the complete bacterial Sec-translocation machinery, depicting its association in SecA-mediated co-translational translocation and its coordination with an extracellular protein-folding system.
Organizational Affiliation:
Molecular Systems Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany.
Molecular Systems Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany; Collaboration for joint PhD degree between EMBL and Heidelberg University, Faculty of Biosciences, Heidelberg, Germany.
Molecular Systems Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany; Julius-Maximilians-Universität Würzburg, Fakultät für Biologie, Am Hubland, 97074 Würzburg, Germany.
Genome Biology Unit, European Molecular Biology Laboratory, Meyerhofstraße 1, 69117 Heidelberg, Germany.
Bioanalytics Unit, Institute of Biotechnology, Technische Universität Berlin, 10623 Berlin, Germany.
Molecular Systems Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany; Genome Biology Unit, European Molecular Biology Laboratory, Meyerhofstraße 1, 69117 Heidelberg, Germany.
EMBL Hamburg, Notkestraße85, 20607 Hamburg, Germany; Centre of Structural Systems Biology, Notkestraße 85, 20607 Hamburg, Germany.
Genome Biology Unit, European Molecular Biology Laboratory, Meyerhofstraße 1, 69117 Heidelberg, Germany. Electronic address: maria.zimmermann@embl.de.
Molecular Systems Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany; Department of Bioinformatics, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany.
Molecular Systems Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany; Cell Biology and Biophysics Unit, European Molecular Biology Laboratory, Meyerhofstraße 1, 69117 Heidelberg, Germany. Electronic address: julia.mahamid@embl.de.
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