51
|
auf dem Keller U, Prudova A, Gioia M, Butler GS, Overall CM. A statistics-based platform for quantitative N-terminome analysis and identification of protease cleavage products. Mol Cell Proteomics 2010; 9:912-27. [PMID: 20305283 PMCID: PMC2871423 DOI: 10.1074/mcp.m000032-mcp201] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Terminal amine isotopic labeling of substrates (TAILS), our recently introduced platform for quantitative N-terminome analysis, enables wide dynamic range identification of original mature protein N-termini and protease cleavage products. Modifying TAILS by use of isobaric tag for relative and absolute quantification (iTRAQ)-like labels for quantification together with a robust statistical classifier derived from experimental protease cleavage data, we report reliable and statistically valid identification of proteolytic events in complex biological systems in MS2 mode. The statistical classifier is supported by a novel parameter evaluating ion intensity-dependent quantification confidences of single peptide quantifications, the quantification confidence factor (QCF). Furthermore, the isoform assignment score (IAS) is introduced, a new scoring system for the evaluation of single peptide-to-protein assignments based on high confidence protein identifications in the same sample prior to negative selection enrichment of N-terminal peptides. By these approaches, we identified and validated, in addition to known substrates, low abundance novel bioactive MMP-2 targets including the plasminogen receptor S100A10 (p11) and the proinflammatory cytokine proEMAP/p43 that were previously undescribed.
Collapse
Affiliation(s)
- Ulrich auf dem Keller
- Department of Biochemistry and Molecular Biology, Centre for Blood Research, University of British Columbia, 4.401 Life Sciences Institute, 2350 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | | | | | | | | |
Collapse
|
52
|
A proteomics approach to study in vivo protein Nα-modifications. J Proteomics 2009; 73:240-51. [DOI: 10.1016/j.jprot.2009.09.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 08/21/2009] [Accepted: 09/09/2009] [Indexed: 11/22/2022]
|
53
|
Frottin F, Espagne C, Traverso JA, Mauve C, Valot B, Lelarge-Trouverie C, Zivy M, Noctor G, Meinnel T, Giglione C. Cotranslational proteolysis dominates glutathione homeostasis to support proper growth and development. THE PLANT CELL 2009; 21:3296-314. [PMID: 19855051 PMCID: PMC2782297 DOI: 10.1105/tpc.109.069757] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2009] [Revised: 09/17/2009] [Accepted: 10/05/2009] [Indexed: 05/18/2023]
Abstract
The earliest proteolytic event affecting most proteins is the excision of the initiating Met (NME). This is an essential and ubiquitous cotranslational process tightly regulated in all eukaryotes. Currently, the effects of NME on unknown complex cellular networks and the ways in which its inhibition leads to developmental defects and cell growth arrest remain poorly understood. Here, we provide insight into the earliest molecular mechanisms associated with the inhibition of the NME process in Arabidopsis thaliana. We demonstrate that the developmental defects induced by NME inhibition are caused by an increase in cellular proteolytic activity, primarily induced by an increase in the number of proteins targeted for rapid degradation. This deregulation drives, through the increase of the free amino acids pool, a perturbation of the glutathione homeostasis, which corresponds to the earliest limiting, reversible step promoting the phenotype. We demonstrate that these effects are universally conserved and that the reestablishment of the appropriate glutathione status restores growth and proper development in various organisms. Finally, we describe a novel integrated model in which NME, protein N-alpha-acylation, proteolysis, and glutathione homeostasis operate in a sequentially regulated mechanism that directs both growth and development.
Collapse
Affiliation(s)
- Frédéric Frottin
- Centre National de la Recherche Scientifique, Institut des Sciences du Végétal, Unité Propre de Recherche2355, Protein Maturation, Cell Fate, and Therapeutics, F-91198 Gif-sur-Yvette cedex, France
| | - Christelle Espagne
- Centre National de la Recherche Scientifique, Institut des Sciences du Végétal, Unité Propre de Recherche2355, Protein Maturation, Cell Fate, and Therapeutics, F-91198 Gif-sur-Yvette cedex, France
| | - José A. Traverso
- Centre National de la Recherche Scientifique, Institut des Sciences du Végétal, Unité Propre de Recherche2355, Protein Maturation, Cell Fate, and Therapeutics, F-91198 Gif-sur-Yvette cedex, France
| | - Caroline Mauve
- Université Paris-Sud, Institut Fédératif de Recherche87, Institut de Biotechnologie des Plantes, Plateforme Métabolisme-Métabolome, F-91405 Orsay, France
- Centre National de la Recherche Scientifique, Institut Fédératif de Recherche87, Institut de Biotechnologie des Plantes, Plateforme Métabolisme-Métabolome, Unité Mixte de Recherche 8618, F-91405 Orsay, France
| | - Benoît Valot
- Université Paris-Sud, Plateforme de Protéomique, Institut Fédératif de Recherche87, Centre National de la Recherche Scientifique/Université Paris-Sud/Institut National de la Recherche Agronomique, F-91190 Gif-sur-Yvette, France
- Centre National de la Recherche Scientifique, Plateforme de Protéomique, Institut Fédératif de Recherche87, F-91190 Gif-sur-Yvette, France
- Institut National de la Recherche Agronomique, Plateforme de Protéomique, Institut Fédératif de Recherche87, F-91190 Gif-sur-Yvette, France
| | - Caroline Lelarge-Trouverie
- Université Paris-Sud, Institut Fédératif de Recherche87, Institut de Biotechnologie des Plantes, Plateforme Métabolisme-Métabolome, F-91405 Orsay, France
- Centre National de la Recherche Scientifique, Institut Fédératif de Recherche87, Institut de Biotechnologie des Plantes, Plateforme Métabolisme-Métabolome, Unité Mixte de Recherche 8618, F-91405 Orsay, France
| | - Michel Zivy
- Université Paris-Sud, Plateforme de Protéomique, Institut Fédératif de Recherche87, Centre National de la Recherche Scientifique/Université Paris-Sud/Institut National de la Recherche Agronomique, F-91190 Gif-sur-Yvette, France
- Centre National de la Recherche Scientifique, Plateforme de Protéomique, Institut Fédératif de Recherche87, F-91190 Gif-sur-Yvette, France
- Institut National de la Recherche Agronomique, Plateforme de Protéomique, Institut Fédératif de Recherche87, F-91190 Gif-sur-Yvette, France
| | - Graham Noctor
- Université Paris-Sud, Institut Fédératif de Recherche87, Institut de Biotechnologie des Plantes, Plateforme Métabolisme-Métabolome, F-91405 Orsay, France
- Centre National de la Recherche Scientifique, Institut Fédératif de Recherche87, Institut de Biotechnologie des Plantes, Plateforme Métabolisme-Métabolome, Unité Mixte de Recherche 8618, F-91405 Orsay, France
| | - Thierry Meinnel
- Centre National de la Recherche Scientifique, Institut des Sciences du Végétal, Unité Propre de Recherche2355, Protein Maturation, Cell Fate, and Therapeutics, F-91198 Gif-sur-Yvette cedex, France
| | - Carmela Giglione
- Centre National de la Recherche Scientifique, Institut des Sciences du Végétal, Unité Propre de Recherche2355, Protein Maturation, Cell Fate, and Therapeutics, F-91198 Gif-sur-Yvette cedex, France
- Address correspondence to
| |
Collapse
|
54
|
Peskin AV, Turner R, Maghzal GJ, Winterbourn CC, Kettle AJ. Oxidation of Methionine to Dehydromethionine by Reactive Halogen Species Generated by Neutrophils. Biochemistry 2009; 48:10175-82. [DOI: 10.1021/bi901266w] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Alexander V. Peskin
- Department of Pathology, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
| | - Rufus Turner
- Department of Pathology, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
| | - Ghassan J. Maghzal
- Department of Pathology, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
| | - Christine C. Winterbourn
- Department of Pathology, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
| | - Anthony J. Kettle
- Department of Pathology, University of Otago Christchurch, P.O. Box 4345, Christchurch, New Zealand
| |
Collapse
|
55
|
Zhao L, Zhang Y, Wei J, Cao D, Liu K, Qian X. A rapid isolation and identification method for blocked N-terminal peptides by isothiocyanate-coupled magnetic nanoparticles and MS. Proteomics 2009; 9:4416-20. [DOI: 10.1002/pmic.200800879] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
56
|
Gutiérrez-Gallego R, Bosch J, Such-Sanmartín G, Segura J. Surface plasmon resonance immuno assays - A perspective. Growth Horm IGF Res 2009; 19:388-398. [PMID: 19473863 DOI: 10.1016/j.ghir.2009.04.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/03/2009] [Indexed: 11/21/2022]
Abstract
Human growth hormone (GH) represents an extremely challenging task from an anti-doping viewpoint. GH is an endogenously produced substance, present at very low levels in circulation (for the most abundant 22kDa isoform approximately 50pM in plasma and 100fM in urine) either as monomer or homo- and heterodimers, comprises a family of distinct isoforms, and obeys a pulsatile secretion routine that is affected by many different internal and external factors. Upon administration of the recombinant, single-isoform pharmaceutical, the feedback mechanism reduces the endogenous heterogeneity resulting in altered ratios between the different GH isoforms. Thus, measuring the isoform ratios through immuno assays appears the approach of choice. Conventional assays do not provide information on isoform-specific association and dissociation events of the individual primary antibody-isoform or isoform-secondary antibody interactions. This particular information can be obtained using the technology of surface plasmon resonance (SPR) which enables monitoring of biomolecular interactions in a dynamic and label-free setting. In this paper the different aspects of SPR are described, how the technology may be beneficial for understanding today's anti-GH immunoassays, and whether the approach could be employed for measuring GH in the near future.
Collapse
Affiliation(s)
- R Gutiérrez-Gallego
- Bioanalysis and Analytical Services Research Group, Neuropsychopharmacology Program, Municipal Institute of Medical Research (IMIM-Hospital del Mar), PRBB, Barcelona, Spain
| | | | | | | |
Collapse
|
57
|
Giglione C, Fieulaine S, Meinnel T. Cotranslational processing mechanisms: towards a dynamic 3D model. Trends Biochem Sci 2009; 34:417-26. [PMID: 19647435 DOI: 10.1016/j.tibs.2009.04.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2009] [Revised: 04/14/2009] [Accepted: 04/29/2009] [Indexed: 11/19/2022]
Abstract
Recent major advances have been made in understanding how cotranslational events are achieved in the course of protein biosynthesis. Specifically, several studies have shed light into the dynamic process of how nascent chains emerging from the ribosome are supported by protein biogenesis factors to ensure both processing and folding mechanisms. To take into account the awareness that coordination is needed, a new 'concerted model' recently proposed simultaneous action of both processes on the ribosome. In the model, any emerging nascent chain is first encountered by the chaperone trigger factor (TF), which forms an open cradle underneath the ribosomal exit tunnel. This cradle serves as a passive router that channels the nascent chains to the first cotranslational event, the proteolysis event performed by the N-terminal methionine excision machinery. Although fascinating, this model clearly raises more questions than it answers. Does the data used to develop this model stand up to scrutiny and, if not, what are the alternative mechanisms that the data suggest?
Collapse
Affiliation(s)
- Carmela Giglione
- Centre National de la Recherche Scientifique, Protein Maturation and Cell Fate, Institut des Sciences du Végétal, Bât.23A, 1 avenue de la Terrasse, F-91198 Gif-sur-Yvette cedex, France.
| | | | | |
Collapse
|
58
|
The ribosome as a platform for co-translational processing, folding and targeting of newly synthesized proteins. Nat Struct Mol Biol 2009; 16:589-97. [PMID: 19491936 DOI: 10.1038/nsmb.1614] [Citation(s) in RCA: 347] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The early events in the life of newly synthesized proteins in the cellular environment are remarkably complex. Concurrently with their synthesis by the ribosome, nascent polypeptides are subjected to enzymatic processing, chaperone-assisted folding or targeting to translocation pores at membranes. The ribosome itself has a key role in these different tasks and governs the interplay between the various factors involved. Indeed, the ribosome serves as a platform for the spatially and temporally regulated association of enzymes, targeting factors and chaperones that act upon the nascent polypeptides emerging from the exit tunnel. Furthermore, the ribosome provides opportunities to coordinate the protein-synthesis activity of its peptidyl transferase center with the protein targeting and folding processes. Here we review the early co-translational events involving the ribosome that guide cytosolic proteins to their native state.
Collapse
|
59
|
Armengaud J. A perfect genome annotation is within reach with the proteomics and genomics alliance. Curr Opin Microbiol 2009; 12:292-300. [PMID: 19410500 DOI: 10.1016/j.mib.2009.03.005] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Revised: 03/26/2009] [Accepted: 03/26/2009] [Indexed: 11/17/2022]
Abstract
High-throughput identification of proteins and their accurate partial sequencing by shotgun nanoLC-MS/MS are now feasible for any cellular model at a full genomic scale. Proteogenomics is the integration of these data with the genome. Mining microbial proteomes allows validation of predicted orphan genes and correction of genome annotation errors such as discovery of unannotated genes, reversal of reading frames and identification of translational start sites, stop codon read-throughs or programmed frameshifts. Recent advances have been achieved in database searches, N-terminal oriented proteomics and homology-driven proteogenomics. From now on, proteogenomics on newly sequenced model genomes can be carried out at the earliest stage of the genome project as already exemplified by Mycoplasma mobile and Deinococcus deserti genomes. The proteomics and genomics alliance produces almost complete and accurate gene catalogues for small microbial genomes, a comprehensiveness which is essential for efficient systems biology.
Collapse
Affiliation(s)
- Jean Armengaud
- CEA, DSV, IBEB, Lab Biochim System Perturb, Bagnols-sur-Cèze, France.
| |
Collapse
|
60
|
Reeves GA, Talavera D, Thornton JM. Genome and proteome annotation: organization, interpretation and integration. J R Soc Interface 2009; 6:129-47. [PMID: 19019817 DOI: 10.1098/rsif.2008.0341] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Recent years have seen a huge increase in the generation of genomic and proteomic data. This has been due to improvements in current biological methodologies, the development of new experimental techniques and the use of computers as support tools. All these raw data are useless if they cannot be properly analysed, annotated, stored and displayed. Consequently, a vast number of resources have been created to present the data to the wider community. Annotation tools and databases provide the means to disseminate these data and to comprehend their biological importance. This review examines the various aspects of annotation: type, methodology and availability. Moreover, it puts a special interest on novel annotation fields, such as that of phenotypes, and highlights the recent efforts focused on the integrating annotations.
Collapse
Affiliation(s)
- Gabrielle A Reeves
- EMBL-EBI, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, UK.
| | | | | |
Collapse
|
61
|
Wiltschi B, Merkel L, Budisa N. Fine tuning the N-terminal residue excision with methionine analogues. Chembiochem 2009; 10:217-20. [PMID: 19067457 DOI: 10.1002/cbic.200800605] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Birgit Wiltschi
- Max Planck Institute of Biochemistry, Molecular Biotechnology, Am Klopferspitz 18, 82152 Martinsried, Germany
| | | | | |
Collapse
|
62
|
Yamamoto T, Nagamune T. Expansion of the sortase-mediated labeling method for site-specific N-terminal labeling of cell surface proteins on living cells. Chem Commun (Camb) 2009:1022-4. [PMID: 19225623 DOI: 10.1039/b818792d] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The sortase-mediated labeling method, whose applications have been limited to C-terminal labeling of cell surface proteins, has been expanded for site-specific N-terminal labeling of cell surface proteins.
Collapse
Affiliation(s)
- Teruyasu Yamamoto
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | | |
Collapse
|
63
|
Wu TF, Chu DS. Sperm chromatin: fertile grounds for proteomic discovery of clinical tools. Mol Cell Proteomics 2008; 7:1876-86. [PMID: 18504257 PMCID: PMC2559940 DOI: 10.1074/mcp.r800005-mcp200] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2008] [Indexed: 01/22/2023] Open
Abstract
Sperm are remarkably complex cells with a singularly important mission: to deliver paternal DNA and its associated factors to the oocyte to start a new life. The integrity of sperm DNA is a keystone of reproductive success, which includes fertilization and embryonic development. In addition, the significance in these processes of proteins that associate with sperm DNA is increasingly being appreciated. In this review, we highlight proteomic studies that have identified sperm chromatin proteins with fertility roles that have been validated by molecular studies in model organisms or correlations in the clinic. Up to 50% of male-factor infertility cases in the clinic have no known cause and therefore no direct treatment. In-depth study of the molecular basis of infertility has great potential to inform the development of sensitive diagnostic tools and effective therapies that will address this incongruity. Because sperm rely on testis-specific protein isoforms and post-translational modifications for their development and function, sperm-specific processes are ideal for proteomic explorations that can bridge the research lab and fertility clinic.
Collapse
Affiliation(s)
- Tammy F Wu
- Department of Biology, San Francisco State University, San Francisco, California 94132, USA
| | | |
Collapse
|
64
|
Martinez A, Traverso JA, Valot B, Ferro M, Espagne C, Ephritikhine G, Zivy M, Giglione C, Meinnel T. Extent of N-terminal modifications in cytosolic proteins from eukaryotes. Proteomics 2008; 8:2809-31. [PMID: 18655050 DOI: 10.1002/pmic.200701191] [Citation(s) in RCA: 128] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Most proteins in all organisms undergo crucial N-terminal modifications involving N-terminal methionine excision, N-alpha-acetylation or N-myristoylation (N-Myr), or S-palmitoylation. We investigated the occurrence of these poorly annotated but essential modifications in proteomes, focusing on eukaryotes. Experimental data for the N-terminal sequences of animal, fungi, and archaeal proteins, were used to build dedicated predictive modules in a new software. In vitro N-Myr experiments were performed with both plant and animal N-myristoyltransferases, for accurate prediction of the modification. N-terminal modifications from the fully sequenced genome of Arabidopsis thaliana were determined by MS. We identified 105 new modified protein N-termini, which were used to check the accuracy of predictive data. An accuracy of more than 95% was achieved, demonstrating (i) overall conservation of the specificity of the modification machinery in higher eukaryotes and (ii) robustness of the prediction tool. Predictions were made for various proteomes. Proteins that had undergone both N-terminal methionine (Met) cleavage and N-acetylation were found to be strongly overrepresented among the most abundant proteins, in contrast to those retaining their genuine unblocked Met. Here we propose that the nature of the second residue of an ORF is a key marker of the abundance of the mature protein in eukaryotes.
Collapse
Affiliation(s)
- Aude Martinez
- Institut des Sciences du Végétal, UPR2355, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
| | | | | | | | | | | | | | | | | |
Collapse
|
65
|
Transcriptional control of spliced and unspliced human T-cell leukemia virus type 1 bZIP factor (HBZ) gene. J Virol 2008; 82:9359-68. [PMID: 18653454 DOI: 10.1128/jvi.00242-08] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The human T-cell leukemia virus type 1 (HTLV-1) basic leucine zipper factor (HBZ) gene is encoded by the minus strand of the HTLV-1 provirus and transcribed from the 3' long terminal repeat (LTR). HBZ gene expression not only inhibits the Tax-mediated activation of viral gene transcription through the 5' LTR but also promotes the proliferation of infected cells. However, the HBZ promoter region and the transcriptional regulation of the gene have not been studied. In this study, we characterize the promoters of the spliced version of the HBZ gene (sHBZ) and the unspliced version of the HBZ gene (usHBZ) by luciferase assay. Both promoters were TATA-less and contained initiators and downstream promoter elements. Detailed studies of the promoter for the sHBZ gene showed that Sp1 sites were critical for its activity. The activities of the sHBZ and usHBZ gene promoters were upregulated by Tax through Tax-responsible elements in the 3' LTR. We compared the functions of the proteins derived from the sHBZ and usHBZ transcripts. sHBZ showed a stronger suppression of Tax-mediated transcriptional activation through the 5' LTR than did usHBZ; the level of suppression correlated with the level of protein produced. The expression of sHBZ had a growth-promoting function in a T-cell line, while usHBZ expression did not. This study demonstrates that Sp1 is critical for sHBZ transcription, which accounts for the constitutive expression of the sHBZ gene. Functional differences between sHBZ and usHBZ suggest that the sHBZ gene plays a significant role in the proliferation of infected cells.
Collapse
|
66
|
Traverso JA, Meinnel T, Giglione C. Expanded impact of protein N-myristoylation in plants. PLANT SIGNALING & BEHAVIOR 2008; 3:501-2. [PMID: 19704499 PMCID: PMC2634443 DOI: 10.4161/psb.3.7.6039] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2008] [Accepted: 04/04/2008] [Indexed: 05/05/2023]
Abstract
N-MYR controls the function of the plant protein complex SnRK1, described as one of the most important plant regulatory protein in stress and energy signalling. In plant cells, N-MYR is involved in a significantly higher number of metabolic pathways than in yeast or human. Some N-myristoylated protein families are solely encountered in plant cells. This lipid modification could be involved in the control of the redox imbalances originating from different stresses in plants. This prevalence of N-MYR in such proteins is unique to the plant kingdom. We hypothesize that this expansion of the mechanism in plants improves the control of the damages induced by environmental changes.
Collapse
Affiliation(s)
- José A Traverso
- Protein Maturation and Cell Fate; ISV; UPR2355; Centre National de la Recherche Scientifique; France
| | | | | |
Collapse
|