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Guillou MC, Balliau T, Vergne E, Canut H, Chourré J, Herrera-León C, Ramos-Martín F, Ahmadi-Afzadi M, D’Amelio N, Ruelland E, Zivy M, Renou JP, Jamet E, Aubourg S. The PROSCOOP10 Gene Encodes Two Extracellular Hydroxylated Peptides and Impacts Flowering Time in Arabidopsis. PLANTS (BASEL, SWITZERLAND) 2022; 11:3554. [PMID: 36559666 PMCID: PMC9784617 DOI: 10.3390/plants11243554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 11/29/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
The Arabidopsis PROSCOOP genes belong to a family predicted to encode secreted pro-peptides, which undergo maturation steps to produce peptides named SCOOP. Some of them are involved in defence signalling through their perception by a receptor complex including MIK2, BAK1 and BKK1. Here, we focused on the PROSCOOP10 gene, which is highly and constitutively expressed in aerial organs. The MS/MS analyses of leaf apoplastic fluids allowed the identification of two distinct peptides (named SCOOP10#1 and SCOOP10#2) covering two different regions of PROSCOOP10. They both possess the canonical S-X-S family motif and have hydroxylated prolines. This identification in apoplastic fluids confirms the biological reality of SCOOP peptides for the first time. NMR and molecular dynamics studies showed that the SCOOP10 peptides, although largely unstructured in solution, tend to assume a hairpin-like fold, exposing the two serine residues previously identified as essential for the peptide activity. Furthermore, PROSCOOP10 mutations led to an early-flowering phenotype and increased expression of the floral integrators SOC1 and LEAFY, consistent with the de-regulated transcription of PROSCOOP10 in several other mutants displaying early- or late-flowering phenotypes. These results suggest a role for PROSCOOP10 in flowering time, highlighting the functional diversity within the PROSCOOP family.
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Affiliation(s)
| | - Thierry Balliau
- AgroParisTech, GQE—Le Moulon, PAPPSO, Université Paris-Saclay, INRAE, CNRS, F-91190 Gif-sur-Yvette, France
| | - Emilie Vergne
- Institut Agro, SFR QUASAV, IRHS, Université Angers, INRAE, F-49000 Angers, France
| | - Hervé Canut
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, UPS, Toulouse INP, CNRS, F-31320 Auzeville-Tolosane, France
| | - Josiane Chourré
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, UPS, Toulouse INP, CNRS, F-31320 Auzeville-Tolosane, France
| | - Claudia Herrera-León
- Unité de Génie Enzymatique et Cellulaire UMR 7025 CNRS, Université de Picardie Jules Verne, F-80039 Amiens, France
| | - Francisco Ramos-Martín
- Unité de Génie Enzymatique et Cellulaire UMR 7025 CNRS, Université de Picardie Jules Verne, F-80039 Amiens, France
| | - Masoud Ahmadi-Afzadi
- Institut Agro, SFR QUASAV, IRHS, Université Angers, INRAE, F-49000 Angers, France
- Department of Biotechnology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman 117-76315, Iran
| | - Nicola D’Amelio
- Unité de Génie Enzymatique et Cellulaire UMR 7025 CNRS, Université de Picardie Jules Verne, F-80039 Amiens, France
| | - Eric Ruelland
- Unité de Génie Enzymatique et Cellulaire UMR 7025 CNRS, Université de Technologie de Compiègne, F-60203 Compiègne, France
| | - Michel Zivy
- AgroParisTech, GQE—Le Moulon, PAPPSO, Université Paris-Saclay, INRAE, CNRS, F-91190 Gif-sur-Yvette, France
| | - Jean-Pierre Renou
- Institut Agro, SFR QUASAV, IRHS, Université Angers, INRAE, F-49000 Angers, France
| | - Elisabeth Jamet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, UPS, Toulouse INP, CNRS, F-31320 Auzeville-Tolosane, France
| | - Sébastien Aubourg
- Institut Agro, SFR QUASAV, IRHS, Université Angers, INRAE, F-49000 Angers, France
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Arden BG, Borotto NB, Burant B, Warren W, Akiki C, Vachet RW. Measuring the Energy Barrier of the Structural Change That Initiates Amyloid Formation. Anal Chem 2020; 92:4731-4735. [PMID: 32159946 DOI: 10.1021/acs.analchem.0c00368] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Obtaining kinetic and thermodynamic information for protein amyloid formation can yield new insight into the mechanistic details of this biomedically important process. The kinetics of the structural change that initiates the amyloid pathway, however, has been challenging to access for any amyloid protein system. Here, using the protein β-2-microglobulin (β2m) as a model, we measure the kinetics and energy barrier associated with an initial amyloidogenic structural change. Using covalent labeling and mass spectrometry, we measure the decrease in solvent accessibility of one of β2m's Trp residues, which is buried during the initial structural change, as a way to probe the kinetics of this structural change at different temperatures and under different amyloid forming conditions. Our results provide the first-ever measure of the activation barrier for a structural change that initiates the amyloid formation pathway. The results also yield new mechanistic insight into β2m's amyloidogenic structural change, especially the role of Pro32 isomerization in this reaction.
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Affiliation(s)
- Blaise G Arden
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Nicholas B Borotto
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Brittney Burant
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - William Warren
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Christine Akiki
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
| | - Richard W Vachet
- Department of Chemistry, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States
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Kraus A. Proline and lysine residues provide modulatory switches in amyloid formation: Insights from prion protein. Prion 2017; 10:57-62. [PMID: 26864641 DOI: 10.1080/19336896.2015.1132138] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Amyloidogenic proteins have an increased propensity to reorganize into the highly structured, β sheet rich structures that characterize amyloid. The probability of attaining these highly structured assemblies is influenced by multiple factors, including amino acid composition and environmental conditions. Evolutionary selection for amino acid sequences that prevent amyloid formation could further modulate amyloid-forming propensity. Indeed, we have recently identified specific proline and lysine residues, contained within a highly conserved central region of prion protein (PrP), that impede PrP amyloid formation in vitro. These prolines are mutated in certain forms of the human familial genetic disease, Gerstmann-Straüssler-Schneiker (GSS) syndrome. Here, I discuss the influence of these proline and lysine residues on PrP amyloid formation and how such anti-amyloidogenic primary amino acid sequences might be modulated to influence protein amyloidogenicity.
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Affiliation(s)
- Allison Kraus
- a Laboratory of Persistant Viral Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health , Hamilton , MT , USA
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Regaya I, Andreotti N, Di Luccio E, De Waard M, Sabatier JM. Effect of Cu2+ on the oxidative folding of synthetic maurotoxin in vitro. J Biomol Struct Dyn 2008; 26:75-82. [PMID: 18533728 DOI: 10.1080/07391102.2008.10507225] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Maurotoxin (MTX) is a 34-mer scorpion toxin cross-linked by four disulphide bridges that acts on various K+ channel types. It folds according to an alpha/beta scaffold, i.e., a helix connected to a two stranded beta-sheet by two disulphide bridges. In a former study, various parameters that affect the oxidation and folding of the reduced form of synthetic MTX were investigated in vitro. It was found that MTX achieves its final 3-D structure by evolving over time through a series of oxidation intermediates, from the least to the most oxidized species. MTX oxidative intermediates can be studied by iodoacetamide alkylation of free cysteine residues followed by mass spectrometry analysis. Here, we have analysed the effect of Cu2+ (0.1 to 50 mM) on the kinetics of MTX oxidative folding and found that it dramatically speeds up the formation of the four-disulphide bridged, native-like, MTX (maximal production within 30 minutes instead of > 60 hours). This catalysing effect of Cu2+ was found to be concentration-dependent, reaching a plateau at 10 mM copper ions. Cu2+ was also found to prevent the slow transition of a three disulphide-bridged MTX intermediate towards the final four disulphide-bridged product (12% of total MTX). The data are discussed in light of the potential effects of Cu2+ on MTX secondary structure formation, disulphide bridging and peptidyl prolyl cis-trans isomerization.
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Affiliation(s)
- I Regaya
- ERT 62 "Ingénierie des protéines", Université de la Méditerranée-Ambrilia Biopharma Inc., Faculté de Médecine Nord, Boulevard Pierre Dramard, 13916 Marseille Cédex 20, France
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Valensin D, Mancini FM, Łuczkowski M, Janicka A, Wisniewska K, Gaggelli E, Valensin G, Łankiewicz L, Kozlowski H. Identification of a novel high affinity copper binding site in the APP(145–155) fragment of amyloid precursor protein. Dalton Trans 2004:16-22. [PMID: 15356736 DOI: 10.1039/b312411h] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The copper(II) binding features of the APP(145-155) and APP(145-157) fragments of the amyloid precursor protein, Ac-Glu-Thr-His-Leu-His-Trp-His-Thr-Val-Ala-Lys-NH2 and Ac-Glu-Thr-His-Leu-His-Trp-His-Thr-Val-Ala-Lys-Glu-Thr-NH2 were studied by NMR spectroscopy and NMR findings were supported by UV-vis, CD and EPR spectra. Potentiometric measurements were performed only for the more soluble Ac-Glu-Thr-His-Leu-His-Trp-His-Thr-Val-Ala-Lys-Glu-Thr-NH2 peptide fragment. The following was shown: (i) the imidazole rings of all the three His residues are involved in metal coordination; (ii) metal binding induces ionisation of Leu-148 and His-149 amide nitrogens that complete the donor set to copper(II) in the species dominant at neutral pH; (iii) the unusual coordination scheme of the His-Xxx-His-Xxx-His consensus sequence justifies the high specificity for Cu(II) when compared to SOD-like or albumin-like peptides or even in amyloid Abeta fragments. The present findings may represent the key for interpreting the observed requirement of His residues conservation for the redox cycling between Cu(II) and Cu(I) by soluble APP.
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Affiliation(s)
- Daniela Valensin
- Department of Chemistry and the NMR Center, University of Siena, via Moro, 53100 Siena, Italy.
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