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Structure and dynamics of plant TatA in micelles and lipid bilayers studied by solution NMR
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
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Number of Authors: 62018 (English)In: The FEBS Journal, ISSN 1742-464X, E-ISSN 1742-4658, Vol. 285, no 10, p. 1886-1906Article in journal (Refereed) Published
Abstract [en]

The twin-arginine translocase (Tat) transports folded proteins across the cytoplasmic membrane of prokaryotes and the thylakoid membrane of plant chloroplasts. In Gram-negative bacteria and chloroplasts, the translocon consists of three subunits, TatA, TatB, and TatC, of which TatA is responsible for the actual membrane translocation of the substrate. Herein we report on the structure, dynamics, and lipid interactions of a fully functional C-terminally truncated core TatA' from Arabidopsisthaliana using solution-state NMR. Our results show that TatA consists of a short N-terminal transmembrane helix (TMH), a short connecting linker (hinge) and a long region with propensity to form an amphiphilic helix (APH). The dynamics of TatA were characterized using N-15 relaxation NMR in combination with model-free analysis. The TMH has order parameters characteristic of a well-structured helix, the hinge is somewhat less rigid, while the APH has lower order parameters indicating structural flexibility. The TMH is short with a surprisingly low protection from solvent, and only the first part of the APH is protected to some extent. In order to uncover possible differences in TatA's structure and dynamics in detergent compared to in a lipid bilayer, fast-tumbling bicelles and large unilamellar vesicles were used. Results indicate that the helicity of TatA increases in both the TMH and APH in the presence of lipids, and that the N-terminal part of the TMH is significantly more rigid. The results indicate that plant TatA has a significant structural plasticity and a capability to adapt to local environments.

Place, publisher, year, edition, pages
2018. Vol. 285, no 10, p. 1886-1906
Keywords [en]
bicelle, dynamics, membrane mimetics, micelle, model-free approach, paramagnetic relaxation enhancement, relaxation, structure, TatA, twin-arginine translocation
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-157788DOI: 10.1111/febs.14452ISI: 000434177700011PubMedID: 29654717OAI: oai:DiVA.org:su-157788DiVA, id: diva2:1235575
Available from: 2018-07-26 Created: 2018-07-26 Last updated: 2018-07-26Bibliographically approved

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