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Andronis CE, Jacques S, Lopez-Ruiz FJ, Lipscombe R, Tan KC. Proteomic analysis revealed that the oomyceticide phosphite exhibits multi-modal action in an oomycete pathosystem. J Proteomics 2024; 301:105181. [PMID: 38670258 DOI: 10.1016/j.jprot.2024.105181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 04/17/2024] [Accepted: 04/23/2024] [Indexed: 04/28/2024]
Abstract
Phytopathogenic oomycetes constitute some of the most devastating plant pathogens and cause significant crop and horticultural yield and economic losses. The phytopathogen Phytophthora cinnamomi causes dieback disease in native vegetation and several crops. The most commonly used chemical to control P. cinnamomi is the oomyceticide phosphite. Despite its widespread use, the mode of action of phosphite is not well understood and it is unclear whether it targets the pathogen, the host, or both. Resistance to phosphite is emerging in P. cinnamomi isolates and other oomycete phytopathogens. The mode of action of phosphite on phosphite-sensitive and resistant isolates of the pathogen and through a model host was investigated using label-free quantitative proteomics. In vitro treatment of sensitive P. cinnamomi isolates with phosphite hinders growth by interfering with metabolism, signalling and gene expression; traits that are not observed in the resistant isolate. When the model host Lupinus angustifolius was treated with phosphite, proteins associated with photosynthesis, carbon fixation and lipid metabolism in the host were enriched. Increased production of defence-related proteins was also observed in the plant. We hypothesise the multi-modal action of phosphite and present two models constructed using comparative proteomics that demonstrate mechanisms of pathogen and host responses to phosphite. SIGNIFICANCE: Phytophthora cinnamomi is a significant phytopathogenic oomycete that causes root rot (dieback) in a number of horticultural crops and a vast range of native vegetation. Historically, areas infected with phosphite have been treated with the oomyceticide phosphite despite its unknown mode of action. Additionally, overuse of phosphite has driven the emergence of phosphite-resistant isolates of the pathogen. We conducted a comparative proteomic study of a sensitive and resistant isolate of P. cinnamomi in response to treatment with phosphite, and the response of a model host, Lupinus angustifolius, to phosphite and its implications on infection. The present study has allowed for a deeper understanding of the bimodal action of phosphite, suggested potential biochemical factors contributing to chemical resistance in P. cinnamomi, and unveiled possible drivers of phosphite-induced host plant immunity to the pathogen.
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Affiliation(s)
- Christina E Andronis
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia; Proteomics International, Nedlands, WA, Australia.
| | - Silke Jacques
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia
| | | | | | - Kar-Chun Tan
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia.
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Bringans S, Casey T, Ito J, Lumbantobing T, O'Neill R, Lipscombe R. Immunoaffinity Mass Spectrometry Diagnostic Tests for Multi-Biomarker Assays. Methods Mol Biol 2023; 2628:195-206. [PMID: 36781787 DOI: 10.1007/978-1-0716-2978-9_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Immunoaffinity mass spectrometry as an approach for diagnostic biomarker assays combines the advantages of antibody selectivity with the multiplexing and analytical performance of mass spectrometry. A method has been developed to detect and quantify three protein biomarkers for a diabetic kidney disease prognostic assay, PromarkerD. The methodology reflects an immunoaffinity approach compatible with higher throughput and robust clinical application. After preparation and purification of antibody-bead conjugates for the three target proteins, an immunoaffinity capture step provides a solution for reduction, alkylation, and digestion on-bead. Targeted mass spectrometry provides a quantitative measure of each biomarker in a rapid 8 min run using a microflow LCMS workflow.
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Affiliation(s)
- Scott Bringans
- Proteomics International, QEII Medical Centre, Nedlands, Perth, WA, Australia.
| | - Tammy Casey
- Proteomics International, QEII Medical Centre, Nedlands, Perth, WA, Australia
| | - Jun Ito
- Proteomics International, QEII Medical Centre, Nedlands, Perth, WA, Australia
| | - Tasha Lumbantobing
- Proteomics International, QEII Medical Centre, Nedlands, Perth, WA, Australia
| | - Ronan O'Neill
- Proteomics International, QEII Medical Centre, Nedlands, Perth, WA, Australia
| | - Richard Lipscombe
- Proteomics International, QEII Medical Centre, Nedlands, Perth, WA, Australia
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Andronis CE, Jacques S, Lipscombe R, Tan KC. Comparative sub-cellular proteome analyses reveals metabolic differentiation and production of effector-like molecules in the dieback phytopathogen Phytophthora cinnamomi. J Proteomics 2022; 269:104725. [PMID: 36096432 DOI: 10.1016/j.jprot.2022.104725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 05/23/2022] [Accepted: 09/06/2022] [Indexed: 11/18/2022]
Abstract
Phytopathogenic oomycetes pose a significant threat to global biodiversity and food security. The proteomes of these oomycetes likely contain important factors that contribute to their pathogenic success, making their discovery crucial for elucidating pathogenicity. Phytophthora cinnamomi is a root pathogen that causes dieback in a wide variety of crops and native vegetation world-wide. Virulence proteins produced by P. cinnamomi are not well defined and a large-scale approach to understand the biochemistry of this pathogen has not been documented. Soluble mycelial, zoospore and secreted proteomes were obtained and label-free quantitative proteomics was used to compare the composition of the three sub-proteomes. A total of 4635 proteins were identified, validating 17.7% of the predicted gene set. The mycelia were abundant in transporters for nutrient acquisition, metabolism and cellular proliferation. The zoospores had less metabolic related ontologies but were abundant in energy generating, motility and signalling associated proteins. Virulence-associated proteins were identified in the secretome such as candidate effector and effector-like proteins, which interfere with the host immune system. These include hydrolases, cell wall degrading enzymes, putative necrosis-inducing proteins and elicitins. The secretome elicited a hypersensitive response on the roots of a model host and thus suggests evidence of effector activity. SIGNIFICANCE: Phytophthora cinnamomi is a phytopathogenic oomycete that causes dieback disease in native vegetation and several horticultural crops such as avocado, pineapple and macadamia. Whilst this pathogen has significance world-wide, its pathogenicity and virulence have not been described in depth. We carried out comparative label-free proteomics of the mycelia, zoospores and secretome of P. cinnamomi. This study highlights the differential metabolism and cellular processes between the sub-proteomes. Proteins associated with metabolism, nutrient transport and cellular proliferation were over represented in the mycelia. The zoospores have a specialised proteome showing increased energy generation geared towards motility. Candidate effectors and effector-like secreted proteins were also identified, which can be exploited for genetic resistance. This demonstrates a better understanding of the biology and pathogenicity of P. cinnamomi infection that can subsequently be used to develop effective methods of disease management.
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Affiliation(s)
- Christina E Andronis
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia; Proteomics International, Nedlands, WA, Australia.
| | - Silke Jacques
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia
| | | | - Kar-Chun Tan
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia.
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Andronis CE, Hane JK, Bringans S, Hardy GESJ, Jacques S, Lipscombe R, Tan KC. Gene Validation and Remodelling Using Proteogenomics of Phytophthora cinnamomi, the Causal Agent of Dieback. Front Microbiol 2021; 12:665396. [PMID: 34394023 PMCID: PMC8360494 DOI: 10.3389/fmicb.2021.665396] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 05/18/2021] [Indexed: 11/13/2022] Open
Abstract
Phytophthora cinnamomi is a pathogenic oomycete that causes plant dieback disease across a range of natural ecosystems and in many agriculturally important crops on a global scale. An annotated draft genome sequence is publicly available (JGI Mycocosm) and suggests 26,131 gene models. In this study, soluble mycelial, extracellular (secretome), and zoospore proteins of P. cinnamomi were exploited to refine the genome by correcting gene annotations and discovering novel genes. By implementing the diverse set of sub-proteomes into a generated proteogenomics pipeline, we were able to improve the P. cinnamomi genome annotation. Liquid chromatography mass spectrometry was used to obtain high confidence peptides with spectral matching to both the annotated genome and a generated 6-frame translation. Two thousand seven hundred sixty-four annotations from the draft genome were confirmed by spectral matching. Using a proteogenomic pipeline, mass spectra were used to edit the P. cinnamomi genome and allowed identification of 23 new gene models and 60 edited gene features using high confidence peptides obtained by mass spectrometry, suggesting a rate of incorrect annotations of 3% of the detectable proteome. The novel features were further validated by total peptide support, alongside functional analysis including the use of Gene Ontology and functional domain identification. We demonstrated the use of spectral data in combination with our proteogenomics pipeline can be used to improve the genome annotation of important plant diseases and identify missed genes. This study presents the first use of spectral data to edit and manually annotate an oomycete pathogen.
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Affiliation(s)
- Christina E Andronis
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia.,Proteomics International, Nedlands, WA, Australia
| | - James K Hane
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia.,Faculty of Science and Engineering, Curtin Institute for Computation, Curtin University, Perth, WA, Australia
| | | | - Giles E S J Hardy
- Centre for Phytophthora Science and Management, Murdoch University, Murdoch, WA, Australia
| | - Silke Jacques
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia
| | | | - Kar-Chun Tan
- Centre for Crop and Disease Management, Curtin University, Bentley, WA, Australia
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Bringans S, Peters K, Casey T, Ito J, Lipscombe R. The New and the Old: Platform Cross-Validation of Immunoaffinity MASS Spectrometry versus ELISA for PromarkerD, a Predictive Test for Diabetic Kidney Disease. Proteomes 2020; 8:proteomes8040031. [PMID: 33126588 PMCID: PMC7709118 DOI: 10.3390/proteomes8040031] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 10/22/2020] [Accepted: 10/27/2020] [Indexed: 11/29/2022] Open
Abstract
PromarkerD is a proteomics derived test for predicting diabetic kidney disease that measures the concentrations of three plasma protein biomarkers, APOA4, CD5L and IBP3. Antibodies against these proteins were developed and applied to a multiplexed immunoaffinity capture mass spectrometry assay. In parallel, and facilitating current clinical laboratory workflows, a standard ELISA was also developed to measure each protein. The performance characteristics of the two technology platforms were compared using a cohort of 100 samples, with PromarkerD test scores demonstrating a high correlation (R = 0.97). These technologies illustrate the potential for large scale, high throughput clinical applications of proteomics now and into the future.
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Bringans S, Ito J, Casey T, Thomas S, Peters K, Crossett B, Coleman O, Ebhardt HA, Pennington SR, Lipscombe R. A robust multiplex immunoaffinity mass spectrometry assay (PromarkerD) for clinical prediction of diabetic kidney disease. Clin Proteomics 2020; 17:37. [PMID: 33093819 PMCID: PMC7576806 DOI: 10.1186/s12014-020-09302-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 10/10/2020] [Indexed: 12/18/2022] Open
Abstract
Background PromarkerD is a novel proteomics derived blood test for predicting diabetic kidney disease (DKD). The test is based on an algorithm that combines the measurement of three plasma protein biomarkers (CD5L, APOA4, and IBP3) with three clinical variables (age, HDL-cholesterol, and eGFR). The initial format of the assay used immunodepletion of plasma samples followed by targeted mass spectrometry (MRM-LCMS). The aim of this study was to convert the existing assay into an immunoaffinity approach compatible with higher throughput and robust clinical application. Methods A newly optimised immunoaffinity-based assay was developed in a 96 well format with MRM measurements made using a low-flow LCMS method. The stability, reproducibility and precision of the assay was evaluated. A direct comparison between the immunoaffinity method and the original immunodepletion method was conducted on a 100-person cohort. Subsequently, an inter-lab study was performed of the optimised immunoaffinity method in two independent laboratories. Results Processing of plasma samples was greatly simplified by switching to an immunoaffinity bead capture method, coupled to a faster and more robust microflow LCMS system. Processing time was reduced from seven to two days and the chromatography reduced from 90 to 8 min. Biomarker stability by temperature and time difference treatments passed acceptance criteria. Intra/Inter-day test reproducibility and precision were within 11% CV for all biomarkers. PromarkerD test results from the new immunoaffinity method demonstrated excellent correlation (R = 0.96) to the original immunodepletion method. The immunoaffinity assay was successfully transferred to a second laboratory (R = 0.98) demonstrating the robustness of the methodology and ease of method transfer. Conclusions An immunoaffinity capture targeted mass spectrometry assay was developed and optimised. It showed statistically comparable results to those obtained from the original immunodepletion method and was also able to provide comparable results when deployed to an independent laboratory. Taking a research grade assay and optimising to a clinical grade workflow provides insights into the future of multiplex biomarker measurement with an immunoaffinity mass spectrometry foundation. In the current format the PromarkerD immunoaffinity assay has the potential to make a significant impact on prediction of diabetic kidney disease with consequent benefit to patients.
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Affiliation(s)
| | - Jason Ito
- Proteomics International, Perth, Australia
| | | | | | | | - Ben Crossett
- Sydney Mass Spectrometry, University of Sydney, Sydney, Australia
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Moodley YP, Corte TJ, Oliver BG, Glaspole IN, Livk A, Ito J, Peters K, Lipscombe R, Casey T, Tan DBA. Analysis by proteomics reveals unique circulatory proteins in idiopathic pulmonary fibrosis. Respirology 2019; 24:1111-1114. [PMID: 31393655 DOI: 10.1111/resp.13668] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 04/13/2019] [Accepted: 06/04/2019] [Indexed: 11/26/2022]
Abstract
BACKGROUND AND OBJECTIVE Idiopathic pulmonary fibrosis (IPF) is a progressive fibrotic disease that has a poor 3-year median survival rate with unclear pathophysiology. Radiological features include bibasal, subpleural fibrosis and honeycombing while its pathology is characterized by fibroblastic foci and honeycombing. Proteomic analysis of circulating molecules in plasma may identify factors that characterize IPF and may assist in the diagnosis, prognostication and determination of pathogenic pathways in this condition. METHODS Two independent quantitative proteomic techniques were used, isobaric tags for relative and absolute quantitation (iTRAQ) and multiple reaction monitoring (MRM), to identify differentially expressed plasma proteins in a group of IPF patients in comparison to healthy controls with normal lung function matched for age and gender. RESULTS Five proteins were identified to be differentially expressed in IPF compared to healthy controls (upregulation of platelet basic protein and downregulation of actin, cytoplasmic 2, antithrombin-III, extracellular matrix protein-1 and fibronectin). CONCLUSION This study further validates the combinational use of non-targeted discovery proteomics (iTRAQ) with targeted quantitation by mass spectrometry (MRM) of soluble biomarkers to identify potentially important molecules and pathways for pulmonary diseases such as IPF.
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Affiliation(s)
- Yuben P Moodley
- School of Biomedical Sciences, University of Western Australia, Perth, WA, Australia.,Stem Cell Unit, Institute for Respiratory Health, Perth, WA, Australia.,Department of Respiratory Medicine, Fiona Stanley Hospital, Perth, WA, Australia.,National Health and Medical Research Council Centre of Research Excellence in Pulmonary Fibrosis, University of Sydney, Sydney, NSW, Australia
| | - Tamera J Corte
- National Health and Medical Research Council Centre of Research Excellence in Pulmonary Fibrosis, University of Sydney, Sydney, NSW, Australia.,Department of Respiratory Medicine, Royal Prince Alfred Hospital, Sydney, NSW, Australia.,School of Medicine, University of Sydney, Sydney, NSW, Australia
| | - Brian G Oliver
- Woolcock Institute of Medical Research, University of Sydney, Sydney, NSW, Australia.,Faculty of Science, University of Technology Sydney, Sydney, NSW, Australia
| | - Ian N Glaspole
- National Health and Medical Research Council Centre of Research Excellence in Pulmonary Fibrosis, University of Sydney, Sydney, NSW, Australia.,Department of Allergy and Respiratory Medicine, The Alfred Hospital, Melbourne, VIC, Australia.,Faculty of Medicine, Monash University, Melbourne, VIC, Australia
| | | | - Jason Ito
- Proteomics International, Perth, WA, Australia
| | | | | | - Tammy Casey
- Proteomics International, Perth, WA, Australia
| | - Dino B A Tan
- School of Biomedical Sciences, University of Western Australia, Perth, WA, Australia.,Stem Cell Unit, Institute for Respiratory Health, Perth, WA, Australia
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Bellgard M, Taplin R, Chapman B, Livk A, Wellington C, Hunter A, Lipscombe R. Classification of fish samples via an integrated proteomics and bioinformatics approach. Proteomics 2013; 13:3124-30. [DOI: 10.1002/pmic.201200426] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 08/02/2013] [Accepted: 08/05/2013] [Indexed: 11/05/2022]
Affiliation(s)
- Matthew Bellgard
- Centre for Comparative Genomics; Murdoch University; Western Australia Australia
| | - Ross Taplin
- Curtin Business School; Curtin University; Western Australia Australia
| | - Brett Chapman
- Centre for Comparative Genomics; Murdoch University; Western Australia Australia
| | - Andreja Livk
- Proteomics International Pty Ltd; Western Australia Australia
| | - Crispin Wellington
- Centre for Comparative Genomics; Murdoch University; Western Australia Australia
| | - Adam Hunter
- Centre for Comparative Genomics; Murdoch University; Western Australia Australia
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Casey T, Solomon PS, Bringans S, Tan KC, Oliver RP, Lipscombe R. Quantitative proteomic analysis of G-protein signalling inStagonospora nodorumusing isobaric tags for relative and absolute quantification. Proteomics 2010; 10:38-47. [DOI: 10.1002/pmic.200900474] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Lui JKC, Lipscombe R, Arthur PG. Detecting Changes in the Thiol Redox State of Proteins Following a Decrease in Oxygen Concentration Using a Dual Labeling Technique. J Proteome Res 2009; 9:383-92. [DOI: 10.1021/pr900702z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James K. C. Lui
- School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, Western Australia, Proteomics International, Perth, Western Australia
| | - Richard Lipscombe
- School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, Western Australia, Proteomics International, Perth, Western Australia
| | - Peter G. Arthur
- School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, Western Australia, Proteomics International, Perth, Western Australia
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Seenarain V, Viola H, Ingley E, Casey T, Lipscombe R, Hool L. Characterisation of Changes in the Cardiac Proteome after Transient Exposure of Myocytes to Hydrogen Peroxide. Heart Lung Circ 2009. [DOI: 10.1016/j.hlc.2009.05.455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ravenscroft G, Colley SM, Walker KR, Clement S, Bringans S, Lipscombe R, Fabian VA, Laing NG, Nowak KJ. Expression of cardiac α-actin spares extraocular muscles in skeletal muscle α-actin diseases – Quantification of striated α-actins by MRM-mass spectrometry. Neuromuscul Disord 2008; 18:953-8. [DOI: 10.1016/j.nmd.2008.09.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2008] [Revised: 07/09/2008] [Accepted: 09/16/2008] [Indexed: 10/21/2022]
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Bringans S, Kendrick TS, Lui J, Lipscombe R. A comparative study of the accuracy of several de novo sequencing software packages for datasets derived by matrix-assisted laser desorption/ionisation and electrospray. Rapid Commun Mass Spectrom 2008; 22:3450-4. [PMID: 18837480 DOI: 10.1002/rcm.3752] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
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Ravenscroft G, Colley S, Walker K, Clement S, Bringans S, Lipscombe R, Fabian V, Laing N, Nowak K. G.P.9.02 Expression of cardiac α-actin spares extraocular muscles in skeletal muscle α-actin diseases – determination of cardiac α-actin by MRM mass spectrometry. Neuromuscul Disord 2008. [DOI: 10.1016/j.nmd.2008.06.214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bringans S, Eriksen S, Kendrick T, Gopalakrishnakone P, Livk A, Lock R, Lipscombe R. Proteomic analysis of the venom of Heterometrus longimanus (Asian black scorpion). Proteomics 2008; 8:1081-96. [PMID: 18246572 DOI: 10.1002/pmic.200700948] [Citation(s) in RCA: 132] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Venoms have evolved over millions of years into potent cocktails of bioactive peptides and proteins. These compounds can be of great value to the pharmaceutical industry for numerous clinical applications. In this study, a novel proteomic - bioinformatic approach was utilised, where chromatography followed by gel electrophoresis was utilised to separate the venom peptides/proteins of Heterometrus longimanus (Asian black scorpion). Purified peptides were analysed by tandem mass spectrometry, de novo sequenced and then homology matched against known peptides in the Swiss-Prot protein database. Numerous potentially biologically active peptide matches were discovered, and a simple scoring system applied to putatively assign functions to the peptides. As a validation of this approach, the functional composition of the experimentally derived proteome is similar to that of other scorpions, and contains a potent mix of toxins, antimicrobials and ionic channel inhibitors.
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Affiliation(s)
- Scott Bringans
- Proteomics International, Perth, Western Australia, Australia.
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Goggin DE, Lipscombe R, Fedorova E, Millar AH, Mann A, Atkins CA, Smith PMC. Dual intracellular localization and targeting of aminoimidazole ribonucleotide synthetase in cowpea. Plant Physiol 2003; 131:1033-41. [PMID: 12644656 PMCID: PMC166869 DOI: 10.1104/pp.102.015081] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2002] [Revised: 11/11/2002] [Accepted: 12/27/2002] [Indexed: 05/18/2023]
Abstract
De novo purine biosynthesis is localized to both mitochondria and plastids isolated from Bradyrhizobium sp.-infected cells of cowpea (Vigna unguiculata L. Walp) nodules, but several of the pathway enzymes, including aminoimidazole ribonucleotide synthetase (AIRS [EC 6.3.3.1], encoded by Vupur5), are encoded by single genes. Immunolocalization confirmed the presence of AIRS protein in both organelles. Enzymatically active AIRS was purified separately from nodule mitochondria and plastids. N-terminal sequencing showed that these two isoforms matched the Vupur5 cDNA sequence but were processed at different sites following import; the mitochondrial isoform was five amino acids longer than the plastid isoform. Electrospray tandem mass spectrometry of a trypsin digest of mitochondrial AIRS identified two internal peptides identical with the amino acid sequence deduced from Vupur5 cDNA. Western blots of proteins from mitochondria and plastids isolated from root tips showed a single AIRS protein present at low levels in both organelles. (35)S-AIRS protein translated from a Vupur5 cDNA was imported into isolated pea (Pisum sativum) leaf chloroplasts in vitro by an ATP-dependent process but not into import-competent mitochondria from several plant and non-plant sources. Components of the mature protein are likely to be important for import because the N-terminal targeting sequence was unable to target green fluorescent protein to either chloroplasts or mitochondria in Arabidopsis leaves. The data confirm localization of the protein translated from the AIRS gene in cowpea to both plastids and mitochondria and that it is cotargeted to both organelles, but the mechanism underlying import into mitochondria has features that are yet to be identified.
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Affiliation(s)
- Danica Erin Goggin
- Department of Botany, The University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia
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