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Carrillo-Carrasco VP, Hernández-García J, Weijers D. Electroporation-based delivery of proteins in Penium margaritaceum and other zygnematophycean algae. PHYSIOLOGIA PLANTARUM 2023; 175:e14121. [PMID: 38148204 DOI: 10.1111/ppl.14121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 11/23/2023] [Accepted: 11/29/2023] [Indexed: 12/28/2023]
Abstract
Zygnematophycean algae represent the streptophyte group identified as the closest sister clade to land plants. Their phylogenetic position and growing genomic resources make these freshwater algae attractive models for evolutionary studies in the context of plant terrestrialization. However, available genetic transformation protocols are limited and exclusively DNA-based. To expand the zygnematophycean toolkit, we developed a DNA-free method for protein delivery into intact cells using electroporation. We use confocal microscopy coupled with fluorescence lifetime imaging to assess the delivery of mNeonGreen into algal cells. We optimized the method to obtain high efficiency of delivery and cell recovery after electroporation in two strains of Penium margaritaceum and show that the experimental setup can also be used to deliver proteins in other zygnematophycean species such as Closterium peracerosum-strigosum-littorale complex and Mesotaenium endlicherianum. We discuss the possible applications of this proof-of-concept method.
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Affiliation(s)
| | | | - Dolf Weijers
- Laboratory of Biochemistry, Wageningen University, Wageningen, the Netherlands
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Pierro A, Tamburrini KC, Leguenno H, Gerbaud G, Etienne E, Guigliarelli B, Belle V, Zambelli B, Mileo E. In-cell investigation of the conformational landscape of the GTPase UreG by SDSL-EPR. iScience 2023; 26:107855. [PMID: 37766968 PMCID: PMC10520941 DOI: 10.1016/j.isci.2023.107855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 07/07/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023] Open
Abstract
UreG is a cytosolic GTPase involved in the maturation network of urease, an Ni-containing bacterial enzyme. Previous investigations in vitro showed that UreG features a flexible tertiary organization, making this protein the first enzyme discovered to be intrinsically disordered. To determine whether this heterogeneous behavior is maintained in the protein natural environment, UreG structural dynamics was investigated directly in intact bacteria by in-cell EPR. This approach, based on site-directed spin labeling coupled to electron paramagnetic resonance (SDSL-EPR) spectroscopy, enables the study of proteins in their native environment. The results show that UreG maintains heterogeneous structural landscape in-cell, existing in a conformational ensemble of two major conformers, showing either random coil-like or compact properties. These data support the physiological relevance of the intrinsically disordered nature of UreG and indicates a role of protein flexibility for this specific enzyme, possibly related to the regulation of promiscuous protein interactions for metal ion delivery.
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Affiliation(s)
- Annalisa Pierro
- Aix Marseille Univ, CNRS, BIP, IMM, 13009 Marseille, France
- Department of Chemistry, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany
| | - Ketty Concetta Tamburrini
- Aix Marseille Univ, CNRS, AFMB, 13009 Marseille, France
- INRAE, Aix Marseille Univ, BBF, 13009 Marseille, France
| | - Hugo Leguenno
- Aix Marseille Univ, CNRS, IMM, Microscopy Core Facility, 13009 Marseille, France
| | | | | | | | - Valérie Belle
- Aix Marseille Univ, CNRS, BIP, IMM, 13009 Marseille, France
| | - Barbara Zambelli
- Laboratory of Bioinorganic Chemistry, Department of Pharmacy and Biotechnology, University of Bologna, 40127 Bologna, Italy
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