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Terzo S, Calvi P, Giardina M, Gallizzi G, Di Carlo M, Nuzzo D, Picone P, Puleio R, Mulè F, Scoglio S, Amato A. Positive Impacts of Aphanizomenon Flos Aquae Extract on Obesity-Related Dysmetabolism in Mice with Diet-Induced Obesity. Cells 2023; 12:2706. [PMID: 38067134 PMCID: PMC10705513 DOI: 10.3390/cells12232706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 11/17/2023] [Accepted: 11/21/2023] [Indexed: 12/18/2023] Open
Abstract
The present study evaluated the ability of KlamExtra®, an Aphanizomenon flos aquae (AFA) extract, to counteract metabolic dysfunctions due to a high fat diet (HFD) or to accelerate their reversion induced by switching an HFD to a normocaloric diet in mice with diet-induced obesity. A group of HFD mice was fed with an HFD supplemented with AFA (HFD-AFA) and another one was fed with regular chow (standard diet-STD) alone or supplemented with AFA (STD-AFA). AFA was able to significantly reduce body weight, hypertriglyceridemia, liver fat accumulation and adipocyte size in HFD mice. AFA also reduced hyperglycaemia, insulinaemia, HOMA-IR and ameliorated the glucose tolerance and the insulin response of obese mice. Furthermore, in obese mice AFA normalised the gene and the protein expression of factors involved in lipid metabolism (FAS, PPAR-γ, SREBP-1c and FAT-P mRNA), inflammation (TNF-α and IL-6 mRNA, NFkB and IL-10 proteins) and oxidative stress (ROS levels and SOD activity). Interestingly, AFA accelerated the STD-induced reversion of glucose dysmetabolism, hepatic and VAT inflammation and oxidative stress. In conclusion, AFA supplementation prevents HFD-induced dysmetabolism and accelerates the STD-dependent recovery of glucose dysmetabolism by positively modulating oxidative stress, inflammation and the expression of the genes linked to lipid metabolism.
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Affiliation(s)
- Simona Terzo
- Department of Biological-Chemical-Pharmaceutical Science and Technology, University of Palermo, 90128 Palermo, Italy
| | - Pasquale Calvi
- Department of Biological-Chemical-Pharmaceutical Science and Technology, University of Palermo, 90128 Palermo, Italy
- Department of Biomedicine, Neuroscience and Advanced Diagnostic, University of Palermo, 90127 Palermo, Italy
| | - Marta Giardina
- Department of Biological-Chemical-Pharmaceutical Science and Technology, University of Palermo, 90128 Palermo, Italy
| | - Giacoma Gallizzi
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via U. La Malfa 153, 90146 Palermo, Italy
| | - Marta Di Carlo
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via U. La Malfa 153, 90146 Palermo, Italy
| | - Domenico Nuzzo
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via U. La Malfa 153, 90146 Palermo, Italy
| | - Pasquale Picone
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via U. La Malfa 153, 90146 Palermo, Italy
| | - Roberto Puleio
- Istituto Zooprofilattico Sperimentale della Sicilia "A. Mirri", Via Gino Marinuzzi 3, 90129 Palermo, Italy
| | - Flavia Mulè
- Department of Biological-Chemical-Pharmaceutical Science and Technology, University of Palermo, 90128 Palermo, Italy
| | | | - Antonella Amato
- Department of Biological-Chemical-Pharmaceutical Science and Technology, University of Palermo, 90128 Palermo, Italy
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via U. La Malfa 153, 90146 Palermo, Italy
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Grim SL, Stuart DG, Aron P, Levin NE, Kinsman-Costello L, Waldbauer JR, Dick GJ. Seasonal shifts in community composition and proteome expression in a sulphur-cycling cyanobacterial mat. Environ Microbiol 2023; 25:2516-2533. [PMID: 37596970 DOI: 10.1111/1462-2920.16480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 07/29/2023] [Indexed: 08/21/2023]
Abstract
Seasonal changes in light and physicochemical conditions have strong impacts on cyanobacteria, but how they affect community structure, metabolism, and biogeochemistry of cyanobacterial mats remains unclear. Light may be particularly influential for cyanobacterial mats exposed to sulphide by altering the balance of oxygenic photosynthesis and sulphide-driven anoxygenic photosynthesis. We studied temporal shifts in irradiance, water chemistry, and community structure and function of microbial mats in the Middle Island Sinkhole (MIS), where anoxic and sulphate-rich groundwater provides habitat for cyanobacteria that conduct both oxygenic and anoxygenic photosynthesis. Seasonal changes in light and groundwater chemistry were accompanied by shifts in bacterial community composition, with a succession of dominant cyanobacteria from Phormidium to Planktothrix, and an increase in diatoms, sulphur-oxidizing bacteria, and sulphate-reducing bacteria from summer to autumn. Differential abundance of cyanobacterial light-harvesting proteins likely reflects a physiological response of cyanobacteria to light level. Beggiatoa sulphur oxidation proteins were more abundant in autumn. Correlated abundances of taxa through time suggest interactions between sulphur oxidizers and sulphate reducers, sulphate reducers and heterotrophs, and cyanobacteria and heterotrophs. These results support the conclusion that seasonal change, including light availability, has a strong influence on community composition and biogeochemical cycling of sulphur and O2 in cyanobacterial mats.
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Affiliation(s)
- Sharon L Grim
- Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | - Dack G Stuart
- Cooperative Institute for Great Lakes Research, University of Michigan, Ann Arbor, Michigan, USA
| | - Phoebe Aron
- Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | - Naomi E Levin
- Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, Michigan, USA
| | | | - Jacob R Waldbauer
- Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois, USA
| | - Gregory J Dick
- Department of Earth and Environmental Sciences, Cooperative Institute for Great Lakes Research, University of Michigan, Ann Arbor, Michigan, USA
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Galizzi G, Deidda I, Amato A, Calvi P, Terzo S, Caruana L, Scoglio S, Mulè F, Di Carlo M. Aphanizomenon flos-aquae (AFA) Extract Prevents Neurodegeneration in the HFD Mouse Model by Modulating Astrocytes and Microglia Activation. Int J Mol Sci 2023; 24:ijms24054731. [PMID: 36902167 PMCID: PMC10003388 DOI: 10.3390/ijms24054731] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 02/15/2023] [Accepted: 02/17/2023] [Indexed: 03/05/2023] Open
Abstract
Obesity and related metabolic dysfunctions are associated with neurodegenerative diseases, such as Alzheimer's disease. Aphanizomenon flos-aquae (AFA) is a cyanobacterium considered a suitable supplement for its nutritional profile and beneficial properties. The potential neuroprotective effect of an AFA extract, commercialized as KlamExtra®, including the two AFA extracts Klamin® and AphaMax®, in High-Fat Diet (HFD)-fed mice was explored. Three groups of mice were provided with a standard diet (Lean), HFD or HFD supplemented with AFA extract (HFD + AFA) for 28 weeks. Metabolic parameters, brain insulin resistance, expression of apoptosis biomarkers, modulation of astrocytes and microglia activation markers, and Aβ deposition were analyzed and compared in the brains of different groups. AFA extract treatment attenuated HFD-induced neurodegeneration by reducing insulin resistance and loss of neurons. AFA supplementation improved the expression of synaptic proteins and reduced the HFD-induced astrocytes and microglia activation, and Aβ plaques accumulation. Together, these outcomes indicate that regular intake of AFA extract could benefit the metabolic and neuronal dysfunction caused by HFD, decreasing neuroinflammation and promoting Aβ plaques clearance.
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Affiliation(s)
- Giacoma Galizzi
- Istituto per la Ricerca e l’Innovazione Biomedica (IRIB), CNR, via U. La Malfa 153, 90146 Palermo, Italy
- Correspondence: (G.G.); (M.D.C.); Tel.: +39-09-1680-9538 (G.G.); +39-09-1680-9538 (M.D.C.)
| | - Irene Deidda
- Istituto per la Ricerca e l’Innovazione Biomedica (IRIB), CNR, via U. La Malfa 153, 90146 Palermo, Italy
| | - Antonella Amato
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università Degli Studi di Palermo, Viale Delle Scienze, 90128 Palermo, Italy
| | - Pasquale Calvi
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università Degli Studi di Palermo, Viale Delle Scienze, 90128 Palermo, Italy
- Dipartimento di Biomedicina, Neuroscienze, e Diagnostica Avanzata (Bi.N.D) (sez. Anatomia Umana), Università di Palermo, via del Vespro 129, 90127 Palermo, Italy
| | - Simona Terzo
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università Degli Studi di Palermo, Viale Delle Scienze, 90128 Palermo, Italy
| | - Luca Caruana
- Istituto per la Ricerca e l’Innovazione Biomedica (IRIB), CNR, via U. La Malfa 153, 90146 Palermo, Italy
| | | | - Flavia Mulè
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università Degli Studi di Palermo, Viale Delle Scienze, 90128 Palermo, Italy
| | - Marta Di Carlo
- Istituto per la Ricerca e l’Innovazione Biomedica (IRIB), CNR, via U. La Malfa 153, 90146 Palermo, Italy
- Correspondence: (G.G.); (M.D.C.); Tel.: +39-09-1680-9538 (G.G.); +39-09-1680-9538 (M.D.C.)
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Nuzzo D, Contardi M, Kossyvaki D, Picone P, Cristaldi L, Galizzi G, Bosco G, Scoglio S, Athanassiou A, Di Carlo M. Heat-Resistant Aphanizomenon flos-aquae (AFA) Extract (Klamin®) as a Functional Ingredient in Food Strategy for Prevention of Oxidative Stress. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:9481390. [PMID: 31827711 PMCID: PMC6885278 DOI: 10.1155/2019/9481390] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 07/24/2019] [Accepted: 09/07/2019] [Indexed: 11/17/2022]
Abstract
Microalgae are generally considered an excellent source of vitamins, minerals, and bioactive molecules that make them suitable to be introduced in cosmetics, pharmaceuticals, and food industries. Aphanizomenon flos-aquae (AFA), an edible microalga, contains numerous biomolecules potentially able to prevent some pathologies including age-related disorders. With the aim to include an AFA extract (Klamin®) as a functional ingredient in baked products, we investigated if its bioactive molecules are destroyed or inactivated after standard cooking temperature. The AFA extract was exposed to heat stress (AFA-HS), and no significant decrease in pigment, polyphenol, and carotenoid content was detected by spectroscopic analysis. Thermal stability of AFA-HS extract was demonstrated by thermogravimetric analysis (TGA), and no change in the morphology of the granules of the powder was noticed by SEM microscopic observation. By Folin-Ciocalteu, ORAC, and ABTS assays, no change in the antioxidant activity and polyphenol contents was found after high-temperature exposition. When added in cell culture, solubilized AFA-HS lost neither its scavenging ability against ROS generation nor its protective role against Abeta, the main peptide involved in Alzheimer's disease. Prebiotic and antioxidant activities of AFA extract that are not lost after thermal stress were verified on E. coli bacteria. Finally, AFA-HS cookies, containing the extract as one of their ingredients, showed increased polyphenols. Here, we evaluate the possibility to use the AFA extract to produce functional food and prevent metabolic and age-related diseases.
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Affiliation(s)
- D. Nuzzo
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - M. Contardi
- Smart Materials, Istituto Italiano di Tecnologia (IIT), Via Morego 30, 16163 Genova, Italy
| | - D. Kossyvaki
- Smart Materials, Istituto Italiano di Tecnologia (IIT), Via Morego 30, 16163 Genova, Italy
| | - P. Picone
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - L. Cristaldi
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via Ugo La Malfa 153, 90146 Palermo, Italy
- Dipartimento di Biopatologia e Biotecnologie Mediche (Di.Bi.Med.), Università di Palermo, Corso Tukory 211, 90134 Palermo, Italy
| | - G. Galizzi
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - G. Bosco
- Le Farine dei Nostri Sacchi S.M.E., Via Ugo La Malfa 135, 90146 Palermo, Italy
| | - S. Scoglio
- Nutrigea-Nutritherapy Research Center, 61029 Urbino, Italy
| | - A. Athanassiou
- Smart Materials, Istituto Italiano di Tecnologia (IIT), Via Morego 30, 16163 Genova, Italy
| | - M. Di Carlo
- Istituto per la Ricerca e l'Innovazione Biomedica (IRIB), CNR, Via Ugo La Malfa 153, 90146 Palermo, Italy
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Effects of the Aphanizomenon flos-aquae Extract (Klamin®) on a Neurodegeneration Cellular Model. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:9089016. [PMID: 30310529 PMCID: PMC6166380 DOI: 10.1155/2018/9089016] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 07/30/2018] [Indexed: 11/29/2022]
Abstract
Cyanobacteria have been recognized as a source of bioactive molecules to be employed in nutraceuticals, pharmaceuticals, and functional foods. An extract of Aphanizomenon flos-aquae (AFA), commercialized as Klamin®, was subjected to chemical analysis to determine its compounds. The AFA extract Klamin® resulted to be nontoxic, also at high doses, when administered onto LAN5 neuronal cells. Its scavenging properties against ROS generation were evaluated by using DCFH-DA assay, and its mitochondrial protective role was determined by JC-1 and MitoSOX assays. Klamin® exerts a protective role against beta amyloid- (Aβ-) induced toxicity and against oxidative stress. Anti-inflammatory properties were demonstrated by NFβB nuclear localization and activation of IL-6 and IL-1β inflammatory cytokines through ELISA. Finally, by using thioflavin T (ThT) and fluorimetric measures, we found that Klamin® interferes with Aβ aggregation kinetics, supporting the formation of smaller and nontoxic structures compared to toxic Aβ aggregates alone. Altogether, these data indicate that the AFA extract may play a protective role against mechanisms leading to neurodegeneration.
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Butorac A, Mekić MS, Hozić A, Diminić J, Gamberger D, Nišavić M, Cindrić M. Benefits of selective peptide derivatization with sulfonating reagent at acidic pH for facile matrix-assisted laser desorption/ionization de novo sequencing. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:1687-1694. [PMID: 28328037 DOI: 10.1002/rcm.7594] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Revised: 04/23/2016] [Accepted: 04/24/2016] [Indexed: 06/06/2023]
Affiliation(s)
| | - Meliha Solak Mekić
- University Hospital Center Sestre Milosrdnice, University Hospital for Tumors, Center for Malignant Disease, Zagreb, Croatia
| | - Amela Hozić
- Centre for Proteomics and Mass Spectrometry and Laboratory for Information Systems, Ruđer Bošković Institute, Zagreb, Croatia
| | - Janko Diminić
- Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
| | - Dragan Gamberger
- Centre for Proteomics and Mass Spectrometry and Laboratory for Information Systems, Ruđer Bošković Institute, Zagreb, Croatia
| | - Marija Nišavić
- Laboratory of Physical Chemistry, Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Mario Cindrić
- Centre for Proteomics and Mass Spectrometry and Laboratory for Information Systems, Ruđer Bošković Institute, Zagreb, Croatia
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Pereira M, Bartolomé CM, Sánchez-Fortún S. Photosynthetic activity and protein overexpression found in Cr(III)-tolerant cells of the green algae Dictyosphaerium chlorelloides. CHEMOSPHERE 2014; 108:274-280. [PMID: 24556547 DOI: 10.1016/j.chemosphere.2014.01.052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 01/09/2014] [Accepted: 01/12/2014] [Indexed: 06/03/2023]
Abstract
Chromium is an important constituent in effluents obtained from chromium plating industries. Due to the highly toxic nature of Cr(VI), attention has been shifted to less hazardous Cr(III) electroplating processes. This study evaluated aquatic toxicity of Cr(III)-containing laboratory samples representative of effluents from chromium electroplating industries, on the photosynthetic activity exhibited by both Cr(III)-sensitive (Dc1M(wt)) and tolerant (Dc1M(Cr(III)R30)) Dictyosphaerium chlorelloides strains. Additionally, selected de novo-determined peptide sequences, obtained from Dc1M(Cr(III)R30), have been analyzed to evidence the possible Cr(III) toxic mechanism involved in the resistance of these cells to high Cr(III) levels in aquatic environments. Dc1M(Cr(III)R30) strain exhibited a gross photosynthetic balance of about five times lower than that exhibited by Dc1M(wt) strain, demonstrating that Dc1M(Cr(III)R30) has a photosynthetic yield significantly lower than Dc1M(wt). SDS-PAGE of Dc1M(Cr(III)R30) samples showed the presence of at least two protein bands (23.05 and 153.46 KDa, respectively) absent in wild-type strain samples. Although it has achieved a low coincidence between the lower molecular weight band and a GTPase identified from genome of the green alga Chlamydomonas reinhardtii, none of de novo peptide sequences obtained showed a significant MS-BLAST score, so that further studies will be required.
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Affiliation(s)
- M Pereira
- Department of Toxicology and Pharmacology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, Avda. Puerta de Hierro s/n, 28040 Madrid, Spain
| | - C M Bartolomé
- School of Chemistry-Pharmacobiology, Michoacana de San Nicolás de Hidalgo University, 43 Santiago Tapia St., 58000 Morelia, Michoacán, Mexico
| | - S Sánchez-Fortún
- Department of Toxicology and Pharmacology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, Avda. Puerta de Hierro s/n, 28040 Madrid, Spain.
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Scoglio S, Benedetti Y, Benvenuti F, Battistelli S, Canestrari F, Benedetti S. Selective monoamine oxidase B inhibition by an Aphanizomenon flos-aquae extract and by its constitutive active principles phycocyanin and mycosporine-like amino acids. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2014; 21:992-997. [PMID: 24690316 DOI: 10.1016/j.phymed.2014.03.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 01/09/2014] [Accepted: 03/02/2014] [Indexed: 06/03/2023]
Abstract
Aphanizomenon flos-aquae (AFA) is a fresh water unicellular blue-green alga that has been traditionally used for over 25 years for its health-enhancing properties. Recent studies have shown the ability of a proprietary AFA extract (Klamin(®)) to improve mood, counteract anxiety, and enhance attention and learning. Aim of this study was to test the monoamine oxidase (MAO) inhibition activity of the same AFA extract and of its constituents phycocyanin (AFA-PC) and mycosporine-like aminoacids (AFA-MAAs). All compounds showed a dose-dependent selective inhibition of MAO-B activity as compared to MAO-A. The IC50 values of the AFA extract (concentration 10 mg/ml), AFA-PC and AFA-MAAs were 6.4 μl/ml, 1.33 μM and 1.98 μM, respectively, evidencing a mixed-type of inhibition for the AFA extract (Ki 0.99 μl/ml), a non-competitive inhibition for AFA-PC (Ki 1.06 μM) and a competitive inhibition for AFA-MAAs (Ki 0.585 μM). These results are important to explain the neuromodulating properties of the AFA extract Klamin(®), which is rich in phenylethylamine, a general neuromodulator, that would nevertheless rapidly destroyed by MAO-B enzymes without the inhibitory activity of the synergic active principles AFA-PC and AFA-MAAs. The present investigation thus proposes the extract as potentially relevant in clinical areas such as mood disorders and neurodegenerative diseases.
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Affiliation(s)
- Stefano Scoglio
- Centro di Ricerche Nutriterapiche, via I Maggetti 14, 61029 Urbino, Italy.
| | - Yanina Benedetti
- Centro di Ricerche Nutriterapiche, via I Maggetti 14, 61029 Urbino, Italy; Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
| | - Francesca Benvenuti
- Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
| | - Serafina Battistelli
- Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
| | - Franco Canestrari
- Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
| | - Serena Benedetti
- Dipartimento di Scienze Biomolecolari, Sezione di Biochimica Clinica e Biologia Cellulare, Università di Urbino "Carlo Bo", via Ubaldini 7, 61029 Urbino, Italy
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García-Murria MJ, Valero ML, Sánchez del Pino MM. Simple chemical tools to expand the range of proteomics applications. J Proteomics 2010; 74:137-50. [PMID: 21074642 DOI: 10.1016/j.jprot.2010.11.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2010] [Revised: 10/08/2010] [Accepted: 11/03/2010] [Indexed: 12/26/2022]
Abstract
Proteomics is an expanding technology with potential applications in many research fields. Even though many research groups do not have direct access to its main analytical technique, mass spectrometry, they can interact with proteomics core facilities to incorporate this technology into their projects. Protein identification is the analysis most frequently performed in core facilities and is, probably, the most robust procedure. Here we discuss a few chemical reactions that are easily implemented within the conventional protein identification workflow. Chemical modification of proteins with N-hydroxysuccinimide esters, 4-sulfophenyl isothiocyanate, O-methylisourea or through β-elimination/Michael addition can be easily performed in any laboratory. The reactions are quite specific with almost no side reactions. These chemical tools increase considerably the number of applications and have been applied to characterize protein-protein interactions, to determine the N-terminal residues of proteins, to identify proteins with non-sequenced genomes or to locate phosphorylated and O-glycosylated.
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Affiliation(s)
- María Jesús García-Murria
- Laboratorio de Proteómica, Centro de Investigación Príncipe Felipe, Avda, Autopista del Saler 16, 46012 Valencia, Spain
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Abstract
The current status of de novo sequencing of peptides by MS/MS is reviewed with focus on collision cell MS/MS spectra. The relation between peptide structure and observed fragment ion series is discussed and the exhaustive extraction of sequence information from CID spectra of protonated peptide ions is described. The partial redundancy of the extracted sequence information and a high mass accuracy are recognized as key parameters for dependable de novo sequencing by MS. In addition, the benefits of special techniques enhancing the generation of long uninterrupted fragment ion series for de novo peptide sequencing are highlighted. Among these are terminal (18)O labeling, MS(n) of sodiated peptide ions, N-terminal derivatization, the use of special proteases, and time-delayed fragmentation. The emerging electron transfer dissociation technique and the recent progress of MALDI techniques for intact protein sequencing are covered. Finally, the integration of bioinformatic tools into peptide de novo sequencing is demonstrated.
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Affiliation(s)
- Joerg Seidler
- Molecular Structure Analysis, German Cancer Research Center, Heidelberg, Germany
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