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Comparison of plastid proteomes points towards a higher plastidial redox turnover in vascular tissues than in mesophyll cells
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0001-8313-3535
School of Biological Sciences, University of Auckland, Auckland, New Zealand.
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0002-0546-7721
2023 (English)In: Journal of Experimental Botany, ISSN 0022-0957, E-ISSN 1460-2431, Vol. 74, no 14, p. 4110-4124Article in journal (Refereed) Published
Abstract [en]

Plastids are complex organelles that vary in size and function depending on the cell type. Accordingly, they can be referred to as amyloplasts, chloroplasts, chromoplasts, etioplasts, or proplasts, to only cite a few. Over the past decades, methods based on density gradients and differential centrifugation have been extensively used for the purification of plastids. However, these methods need large amounts of starting material, and hardly provide a tissue-specific resolution. Here, we applied our IPTACT (Isolation of Plastids TAgged in specific Cell Types) method, which involves the biotinylation of plastids in vivo using one-shot transgenic lines expressing the Translocon of the Outer Membrane 64 (TOC64) gene coupled with a biotin ligase receptor particle and the BirA biotin ligase, to isolate plastids from mesophyll and companion cells of Arabidopsis using tissue specific pCAB3 and pSUC2 promoters, respectively. Subsequently, a proteome profiling was performed, which allowed the identification of 1672 proteins, among which 1342 were predicted to be plastidial, and 705 were fully confirmed according to the SUBA5 database. Interestingly, although 92% of plastidial proteins were equally distributed between the two tissues, we observed an accumulation of proteins associated with jasmonic acid biosynthesis, plastoglobuli (e.g. NAD(P)H dehydrogenase C1, vitamin E deficient 1, plastoglobulin of 34 kDa, ABC1-like kinase 1) and cyclic electron flow in plastids originating from vascular tissue. Besides demonstrating the technical feasibility of isolating plastids in a tissue-specific manner, our work provides strong evidence that plastids from vascular tissue have a higher redox turnover to ensure optimal functioning, notably under high solute strength as encountered in vascular cells.

Place, publisher, year, edition, pages
Oxford University Press, 2023. Vol. 74, no 14, p. 4110-4124
Keywords [en]
Biotin-streptavidin interaction, cyclic electron flow, plastids, plastoglobuli, proteomics, vascular and mesophyll cells
National Category
Botany
Identifiers
URN: urn:nbn:se:umu:diva-213699DOI: 10.1093/jxb/erad133ISI: 000984210400001Scopus ID: 2-s2.0-85168462360OAI: oai:DiVA.org:umu-213699DiVA, id: diva2:1798212
Funder
The Kempe FoundationsCarl Tryggers foundation , CTS2018-193Swedish Foundation for Strategic Research, FFF20-0008Knut and Alice Wallenberg FoundationVinnovaAvailable from: 2023-09-18 Created: 2023-09-18 Last updated: 2023-09-18Bibliographically approved

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Boussardon, ClémentKeech, Olivier

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CiteExportLink to record
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