ArticleBio-protocol2021
Synchronized Real-time Measurement of Sec-mediated Protein Translocation.
Article in Bio-protocol, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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3 authors.
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Abstract
The Sec translocon, consisting of a heterotrimeric transmembrane channel (SecYEG) and an associated ATPase (SecA), catalyzes the export of unfolded proteins from the cytosol in bacteria. Kinetically resolving protein translocation at high resolution yields mechanistic insight into the process. Translocation is typically followed by measuring the protection of proteins transported into lipid vesicles, which only allows visualization of translocation after it has already been completed and limits time resolution. Here, we describe the implementation of an assay for measuring translocation in real-time. By priming the reconstituted translocon with suitably engineered substrate proteins, the kinetics of the actual translocation process can be resolved at high resolution. To analyze translocation kinetics, we developed a detailed kinetic model of the process that includes on-pathway and off-pathway processes. Together, this experimental protocol and model permit detailed mechanistic analyses of Sec-dependent protein translocation. Graphic abstract: Synchronized real-time measurements, combined with a detailed kinetic model, enable a mechanistic analysis of protein transport.
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