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Hammoud M, Rajha HN, Chokr A, Safi C, van den Broek LAM, van Erven G, Maroun RG, Debs E, Rammal H, Louka N. Chemical Composition and Biological Activities of Centranthus longiflorus Stems Extracts Recovered Using Ired-Irrad®, an Innovative Infrared Technology, Compared to Water Bath and Ultrasound. Life (Basel) 2023; 13:1288. [PMID: 37374071 DOI: 10.3390/life13061288] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/24/2023] [Accepted: 05/24/2023] [Indexed: 06/29/2023] Open
Abstract
Extraction of polyphenols from Centranthus longiflorus stems was conducted using ultrasound and infrared Ired-Irrad® techniques, and compared to the conventional water bath method. Response surface methodology was used to analyse the effect of time, temperature, and ethanol percentage, as well as to optimize the three extraction methods. The highest phenolic content (81 mg GAE/g DM) and antioxidant activity (76% DPPH inhibition) were recorded with the Ired-Irrad® extract obtained under the optimal conditions: 55 °C, 127 min, 48% (v/v) ethanol. Biological activities (antioxidant, antibacterial and antibiofilm) of the three extracts were assessed. All C. longiflorus stems extracts showed limited antibacterial effects regardless of the extraction method (MIC = 50 mg/mL), whereas Ired-Irrad® extract exhibited the highest biofilm eradication and prevention capacities (93% against Escherichia coli and 97% against Staphylococcus epidermidis, respectively). This bioactivity is likely related to abundant caffeoylquinic acid and quercetin rutinoside, as identified by RP-UHPLC-PDA-MS analysis. The results obtained further promote the effectiveness of Ired-Irrad® as a highly flexible and cost-efficient extraction technique.
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Affiliation(s)
- Mariam Hammoud
- Centre d'Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, CST-Mar Roukos-Dekwaneh, Riad El Solh, P.O. Box 1514, Beirut 1107 2050, Lebanon
- Research Laboratory of Microbiology (RLM), Department of Life and Earth Sciences, Faculty of Sciences I, Lebanese University, Hadath Campus, P.O. Box 5, Beirut 1683, Lebanon
- Platform of Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Sciences and Technology (DSST), Lebanese University, Hadath Campus, P.O. Box 6573/14, Beirut 1683, Lebanon
| | - Hiba N Rajha
- Centre d'Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, CST-Mar Roukos-Dekwaneh, Riad El Solh, P.O. Box 1514, Beirut 1107 2050, Lebanon
- Ecole Supérieure d'Ingénieurs de Beyrouth (ESIB), Université Saint-Joseph de Beyrouth, CST-Mar Roukos-Dekwaneh, Riad El Solh, P.O. Box 1514, Beirut 1107 2050, Lebanon
| | - Ali Chokr
- Research Laboratory of Microbiology (RLM), Department of Life and Earth Sciences, Faculty of Sciences I, Lebanese University, Hadath Campus, P.O. Box 5, Beirut 1683, Lebanon
- Platform of Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Sciences and Technology (DSST), Lebanese University, Hadath Campus, P.O. Box 6573/14, Beirut 1683, Lebanon
| | - Carl Safi
- Wageningen Food & Biobased Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | | | - Gijs van Erven
- Wageningen Food & Biobased Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Richard G Maroun
- Centre d'Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, CST-Mar Roukos-Dekwaneh, Riad El Solh, P.O. Box 1514, Beirut 1107 2050, Lebanon
| | - Espérance Debs
- Department of Biology, Faculty of Arts and Sciences, University of Balamand, P.O. Box 100, Tripoli 1300, Lebanon
| | - Hassan Rammal
- Research Laboratory of Microbiology (RLM), Department of Life and Earth Sciences, Faculty of Sciences I, Lebanese University, Hadath Campus, P.O. Box 5, Beirut 1683, Lebanon
- Platform of Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Sciences and Technology (DSST), Lebanese University, Hadath Campus, P.O. Box 6573/14, Beirut 1683, Lebanon
| | - Nicolas Louka
- Centre d'Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, CST-Mar Roukos-Dekwaneh, Riad El Solh, P.O. Box 1514, Beirut 1107 2050, Lebanon
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Scholtmeijer K, van den Broek LAM, Fischer ARH, van Peer A. Potential Protein Production from Lignocellulosic Materials Using Edible Mushroom Forming Fungi. J Agric Food Chem 2023; 71:4450-4457. [PMID: 36883423 PMCID: PMC10037329 DOI: 10.1021/acs.jafc.2c08828] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/22/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
There is a need for new protein sources to feed the world in a sustainable way. Converting non-food-grade "woody" side streams into food containing proteins will contribute to this mission. Mushroom forming fungi are unique in their capability to convert lignocellulosic substances into edible biomass containing protein. Especially if substrate mycelium can be used instead of mushrooms, this technology could be a serious contribution to addressing the protein challenge. In this Perspective, we discuss challenges toward production, purification, and market introduction of mushroom mycelium based foods.
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Affiliation(s)
- Karin Scholtmeijer
- Wageningen
Plant Breeding Research, Mushroom Research
Group, Droevensdaalsesteeg
1, 6708PB Wageningen, The Netherlands
| | | | - Arnout R. H. Fischer
- Wageningen
University Marketing and Consumer Behaviour Group, Hollandseweg 1, 6706KN Wageningen, The Netherlands
| | - Arend van Peer
- Wageningen
Plant Breeding Research, Mushroom Research
Group, Droevensdaalsesteeg
1, 6708PB Wageningen, The Netherlands
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3
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Salem Y, Rajha HN, van den Broek LAM, Safi C, Togtema A, Manconi M, Manca ML, Debs E, Hobaika Z, Maroun RG, Louka N. Multi-Step Biomass Fractionation of Grape Seeds from Pomace, a Zero-Waste Approach. Plants (Basel) 2022; 11:2831. [PMID: 36365284 PMCID: PMC9658473 DOI: 10.3390/plants11212831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 10/16/2022] [Accepted: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Grape seeds are the wineries' main by-products, and their disposal causes ecological and environmental problems. In this study seeds from the pomace waste of autochthonous grape varieties from Lebanon, Obeidi (white variety) and Asswad Karech (red variety) were used for a multi-step biomass fractionation. For the first step, a lipid extraction was performed, and the obtained yield was 12.33% (w/w) for Obeidi and 13.04% (w/w) for Asswad Karech. For the second step, polyphenols' recovery from the defatted seeds was carried out, resulting in 12.0% (w/w) for Obeidi and 6.6% (w/w) for Asswad Karech, with Obeidi's extract having the highest total phenolic content (333.1 ± 1.6 mg GAE/g dry matter) and antioxidant activity (662.17 ± 0.01 µg/mL of Trolox equivalent). In the third step, the defatted and dephenolized seeds were subsequently extracted under alkaline conditions and the proteins were isoelectric precipitated. The recovered protein extract was 3.90% (w/w) for Obeidi and 4.11% (w/w) for Asswad Karech seeds, with Asswad Karech's extract having the highest protein content (64 ± 0.2 mg protein/g dry matter). The remaining exhausted residue can be valorized in cosmetic scrubs formulations as a replacement for plastic microbeads. The designed zero-waste approach multi-step biomass fractionation has the potential to improve the valorization of the side products (grape seeds) of these two Lebanese autochthonous grape varieties.
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Affiliation(s)
- Yara Salem
- Centre d’Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Riad El Solh, P.O. Box 17-5208, Beirut 1104 2020, Lebanon
| | - Hiba N. Rajha
- Ecole Supérieure d’Ingénieurs de Beyrouth (ESIB), Université Saint-Joseph de Beyrouth, CST Mkalles Mar Roukos, Riad El Solh, Beirut 1107 2050, Lebanon
| | | | - Carl Safi
- Wageningen Food & Biobased Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Arnoud Togtema
- Wageningen Food & Biobased Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Maria Manconi
- Centre for Nanobiotechnology Sardinia CNBS, Department of Scienze della Vita e dell’Ambiente, University of Cagliari, 09124 Cagliari, Italy
| | - Maria Letizia Manca
- Centre for Nanobiotechnology Sardinia CNBS, Department of Scienze della Vita e dell’Ambiente, University of Cagliari, 09124 Cagliari, Italy
| | - Espérance Debs
- Department of Biology, Faculty of Arts and Sciences, University of Balamand, P.O. Box 100, Tripoli 1300, Lebanon
| | - Zeina Hobaika
- Centre d’Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Riad El Solh, P.O. Box 17-5208, Beirut 1104 2020, Lebanon
| | - Richard G. Maroun
- Centre d’Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Riad El Solh, P.O. Box 17-5208, Beirut 1104 2020, Lebanon
| | - Nicolas Louka
- Centre d’Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Riad El Solh, P.O. Box 17-5208, Beirut 1104 2020, Lebanon
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Hammoud M, Chokr A, Rajha HN, Safi C, van Walsem M, van den Broek LAM, Debs E, Maroun RG, Louka N, Rammal H. Intensification of Polyphenols Extraction from Eryngium creticum Leaves Using Ired-Irrad® and Evaluation of Antibiofilm and Antibacterial Activities. Plants 2022; 11:plants11192458. [PMID: 36235324 PMCID: PMC9572813 DOI: 10.3390/plants11192458] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 09/05/2022] [Accepted: 09/15/2022] [Indexed: 11/25/2022]
Abstract
(1) Background: Eryngium creticum is a plant medicinally valued, and used in pharmacopeia to treat various diseases. No previous studies have been reported on E. creticum leaf extracts using an IR-assisted technique; thus, this study aimed to intensify polyphenol extraction using Ired-Irrad®, comparing it to the conventional water bath (WB) method. (2) Methods: Optimization of polyphenol extraction from E. creticum leaves was conducted using Response Surface Methodology. Ired-Irrad® was used and compared to the WB method. The biological activities (antiradical, antioxidant, antibacterial, and antibiofilm) of both extracts were assessed. UHPLC analysis was performed to analyze the phytochemical profile of both extracts. (3) Results: Under optimal conditions, IR improved the polyphenol extraction yield by 1.7 times, while lowering ethanol consumption by 1.5 times. Regarding the antibacterial activity, both WB and IR E. creticum leaf extracts exhibited the highest antibacterial activity against Staphylococcus epidermidis. The maximum biofilm prevention capacity was also noticed against S. epidermidis. UHPLC-MS analysis quantified two major phenolic compounds in both extracts: rutin and sinapic acid. (4) Conclusions: Ired-Irrad® technology proved to be an effective technique in intensifying polyphenol recovery, while preserving their quantity and quality.
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Affiliation(s)
- Mariam Hammoud
- Research Laboratory of Microbiology (RLM), Department of Life and Earth Sciences, Faculty of Sciences I, Lebanese University, Hadat Campus, P.O. Box 5, Beirut 1683, Lebanon
- Centre d’Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Riad El Solh, P.O. Box 17-5208, Beirut 1104 2020, Lebanon
- Platform of Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Sciences and Technology (DSST), Lebanese University, Hadat Campus, P. O. Box 6573/14, Beirut 1683, Lebanon
| | - Ali Chokr
- Research Laboratory of Microbiology (RLM), Department of Life and Earth Sciences, Faculty of Sciences I, Lebanese University, Hadat Campus, P.O. Box 5, Beirut 1683, Lebanon
- Platform of Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Sciences and Technology (DSST), Lebanese University, Hadat Campus, P. O. Box 6573/14, Beirut 1683, Lebanon
| | - Hiba N. Rajha
- Ecole Supérieure d’Ingénieurs de Beyrouth (ESIB), Université Saint-Joseph de Beyrouth, CST Mkalles Mar Roukos, Riad El Solh, P.O. Box 11-514, Beirut 1107 2050, Lebanon
| | - Carl Safi
- Wageningen Food & Biobased Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
- Correspondence:
| | - Martijn van Walsem
- Wageningen Food & Biobased Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | | | - Espérance Debs
- Department of Biology, Faculty of Arts and Sciences, University of Balamand, P.O. Box 100, Tripoli 1300, Lebanon
| | - Richard G. Maroun
- Centre d’Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Riad El Solh, P.O. Box 17-5208, Beirut 1104 2020, Lebanon
| | - Nicolas Louka
- Centre d’Analyses et de Recherche, Unité de Recherche Technologies et Valorisation Agro-Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Riad El Solh, P.O. Box 17-5208, Beirut 1104 2020, Lebanon
| | - Hassan Rammal
- Research Laboratory of Microbiology (RLM), Department of Life and Earth Sciences, Faculty of Sciences I, Lebanese University, Hadat Campus, P.O. Box 5, Beirut 1683, Lebanon
- Platform of Research and Analysis in Environmental Sciences (PRASE), Doctoral School of Sciences and Technology (DSST), Lebanese University, Hadat Campus, P. O. Box 6573/14, Beirut 1683, Lebanon
- Faculty of Agronomy, Lebanese University, Dekweneh, Beirut 1683, Lebanon
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van der Klis F, Knoop RJI, Bitter JH, van den Broek LAM. The effect of me-substituents of 1,4-butanediol analogues on the thermal properties of biobased polyesters. J Polym Sci A Polym Chem 2018; 56:1903-1906. [PMID: 30333681 PMCID: PMC6174968 DOI: 10.1002/pola.29074] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 05/25/2018] [Indexed: 12/02/2022]
Abstract
Biobased 1,4-butanediol analogues are used to tune the glass transition temperature and crystallization in a series of polyesters and allow for the formation of stereocomplexes.
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Affiliation(s)
- Frits van der Klis
- Wageningen Food and Biobased Research, Bornse Weilanden 9, 6708WG WageningenThe Netherlands
- Wageningen Biobased Chemistry and Technology, Bornse Weilanden 9, 6708WG WageningenThe Netherlands
| | - Rutger J. I. Knoop
- Wageningen Food and Biobased Research, Bornse Weilanden 9, 6708WG WageningenThe Netherlands
| | - Johannes H. Bitter
- Wageningen Biobased Chemistry and Technology, Bornse Weilanden 9, 6708WG WageningenThe Netherlands
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6
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Krolicka M, Hinz SWA, Koetsier MJ, Eggink G, van den Broek LAM, Boeriu CG. β-N-Acetylglucosaminidase MthNAG from Myceliophthora thermophila C1, a thermostable enzyme for production of N-acetylglucosamine from chitin. Appl Microbiol Biotechnol 2018; 102:7441-7454. [PMID: 29943052 PMCID: PMC6097783 DOI: 10.1007/s00253-018-9166-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 03/19/2018] [Revised: 06/07/2018] [Accepted: 06/09/2018] [Indexed: 11/30/2022]
Abstract
Thermostable enzymes are a promising alternative for chemical catalysts currently used for the production of N-acetylglucosamine (GlcNAc) from chitin. In this study, a novel thermostable β-N-acetylglucosaminidase MthNAG was cloned and purified from the thermophilic fungus Myceliophthora thermophila C1. MthNAG is a protein with a molecular weight of 71 kDa as determined with MALDI-TOF-MS. MthNAG has the highest activity at 50 °C and pH 4.5. The enzyme shows high thermostability above the optimum temperature: at 55 °C (144 h, 75% activity), 60 °C (48 h, 85% activity; half-life 82 h), and 70 °C (24 h, 33% activity; half-life 18 h). MthNAG releases GlcNAc from chitin oligosaccharides (GlcNAc)2–5, p-nitrophenol derivatives of chitin oligosaccharides (GlcNAc)1–3-pNP, and the polymeric substrates swollen chitin and soluble chitosan. The highest activity was detected towards (GlcNAc)2. MthNAG released GlcNAc from the non-reducing end of the substrate. We found that MthNAG and Chitinase Chi1 from M. thermophila C1 synergistically degraded swollen chitin and released GlcNAc in concentration of approximately 130 times higher than when only MthNAG was used. Therefore, chitinase Chi1 and MthNAG have great potential in the industrial production of GlcNAc.
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Affiliation(s)
- Malgorzata Krolicka
- Department of Bioprocess Engineering, Wageningen University, Wageningen, The Netherlands
| | | | | | - Gerrit Eggink
- Department of Bioprocess Engineering, Wageningen University, Wageningen, The Netherlands.,Wageningen Food & Biobased Research, Wageningen, The Netherlands
| | | | - Carmen G Boeriu
- Wageningen Food & Biobased Research, Wageningen, The Netherlands.
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Krolicka M, Hinz SWA, Koetsier MJ, Joosten R, Eggink G, van den Broek LAM, Boeriu CG. Chitinase Chi1 from Myceliophthora thermophila C1, a Thermostable Enzyme for Chitin and Chitosan Depolymerization. J Agric Food Chem 2018; 66:1658-1669. [PMID: 29359934 PMCID: PMC5847117 DOI: 10.1021/acs.jafc.7b04032] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A thermostable Chitinase Chi1 from Myceliophthora thermophila C1 was homologously produced and characterized. Chitinase Chi1 shows high thermostability at 40 °C (>140 h 90% activity), 50 °C (>168 h 90% activity), and 55 °C (half-life 48 h). Chitinase Chi1 has broad substrate specificity and converts chitin, chitosan, modified chitosan, and chitin oligosaccharides. The activity of Chitinase Chi1 is strongly affected by the degree of deacetylation (DDA), molecular weight (Mw), and side chain modification of chitosan. Chitinase Chi1 releases mainly (GlcNAc)2 from insoluble chitin and chito-oligosaccharides with a polymerization degree (DP) ranging from 2 to 12 from chitosan, in a processive way. Chitinase Chi1 shows higher activity toward chitin oligosaccharides (GlcNAc)4-6 than toward (GlcNAc)3 and is inactive for (GlcNAc)2. During hydrolysis, oligosaccharides bind at subsites -2 to +2 in the enzyme's active site. Chitinase Chi1 can be used for chitin valorisation and for production of chitin- and chito-oligosaccharides at industrial scale.
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Affiliation(s)
- Malgorzata Krolicka
- Department
of Bioprocess Engineering, Wageningen University, Wageningen, The Netherlands
| | | | | | - Rob Joosten
- DuPont
Industrial Biosciences, Wageningen, The Netherlands
| | - Gerrit Eggink
- Department
of Bioprocess Engineering, Wageningen University, Wageningen, The Netherlands
- Wageningen
Food & Biobased Research, Wageningen, The Netherlands
| | | | - Carmen G. Boeriu
- Wageningen
Food & Biobased Research, Wageningen, The Netherlands
- E-mail: . Phone: +31 317 480168
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Janssen R, Vincken JP, van den Broek LAM, Fogliano V, Lakemond CMM. Nitrogen-to-Protein Conversion Factors for Three Edible Insects: Tenebrio molitor, Alphitobius diaperinus, and Hermetia illucens. J Agric Food Chem 2017; 65:2275-2278. [PMID: 28252948 PMCID: PMC5364430 DOI: 10.1021/acs.jafc.7b00471] [Citation(s) in RCA: 276] [Impact Index Per Article: 39.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Insects are considered a nutritionally valuable source of alternative proteins, and their efficient protein extraction is a prerequisite for large-scale use. The protein content is usually calculated from total nitrogen using the nitrogen-to-protein conversion factor (Kp) of 6.25. This factor overestimates the protein content, due to the presence of nonprotein nitrogen in insects. In this paper, a specific Kp of 4.76 ± 0.09 was calculated for larvae from Tenebrio molitor, Alphitobius diaperinus, and Hermetia illucens, using amino acid analysis. After protein extraction and purification, a Kp factor of 5.60 ± 0.39 was found for the larvae of three insect species studied. We propose to adopt these Kp values for determining protein content of insects to avoid overestimation of the protein content.
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Affiliation(s)
- Renske
H. Janssen
- Food
Quality and Design, Wageningen University
and Research, P.O. Box 17, 6700 AA Wageningen, The
Netherlands
- Laboratory
of Food Chemistry, Wageningen University
and Research, P.O. Box 17, 6700 AA Wageningen, The
Netherlands
| | - Jean-Paul Vincken
- Laboratory
of Food Chemistry, Wageningen University
and Research, P.O. Box 17, 6700 AA Wageningen, The
Netherlands
| | - Lambertus A. M. van den Broek
- Wageningen
Food & Biobased Research, Wageningen
University and Research, P.O. Box 17, 6700 AA Wageningen, The
Netherlands
| | - Vincenzo Fogliano
- Food
Quality and Design, Wageningen University
and Research, P.O. Box 17, 6700 AA Wageningen, The
Netherlands
| | - Catriona M. M. Lakemond
- Food
Quality and Design, Wageningen University
and Research, P.O. Box 17, 6700 AA Wageningen, The
Netherlands
- (C.M.M.L.) Phone: +31 317
480 288. E-mail:
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9
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de Keijzer J, van den Broek LAM, Ketelaar T, van Lammeren AAM. Histological examination of horse chestnut infection by Pseudomonas syringae pv. aesculi and non-destructive heat treatment to stop disease progression. PLoS One 2012; 7:e39604. [PMID: 22808044 PMCID: PMC3392261 DOI: 10.1371/journal.pone.0039604] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Accepted: 05/23/2012] [Indexed: 11/19/2022] Open
Abstract
Since its emergence in Northwest Europe as a pathogen that infects trunks and branches of Aesculus spp. (the horse chestnuts) approximately one decade ago, Pseudomonas syringae pv. aesculi has rapidly established itself as major threat to these trees. Infected trees exhibit extensive necrosis of phloem and cambium, which can ultimately lead to dieback. The events after host entry leading to extensive necrosis are not well documented. In this work, the histopathology of this interaction is investigated and heat-treatment is explored as method to eradicate bacteria associated with established infections. The early wound-repair responses of A. hippocastanum, both in absence and presence of P. s. pv. aesculi, included cell wall lignification by a distinct layer of phloem and cortex parenchyma cells. The same cells also deposited suberin lamellae later on, suggesting this layer functions in compartmentalizing healthy from disrupted tissues. However, monitoring bacterial ingress, its construction appeared inadequate to constrain pathogen spread. Microscopic evaluation of bacterial dispersal in situ using immunolabelling and GFP-tagging of P. s. pv. aesculi, revealed two discriminative types of bacterial colonization. The forefront of lesions was found to contain densely packed bacteria, while necrotic areas housed bacterial aggregates with scattered individuals embedded in an extracellular matrix of bacterial origin containing alginate. The endophytic localization and ability of P. s. pv aesculi to create a protective matrix render it poorly accessible for control agents. To circumvent this, a method based on selective bacterial lethality at 39 °C was conceived and successfully tested on A. hippocastanum saplings, providing proof of concept for controlling this disease by heat-treatment. This may be applicable for curing other tree cankers, caused by related phytopathogens.
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Affiliation(s)
- Jeroen de Keijzer
- Laboratory of Cell Biology, Wageningen University and Research Centre, Wageningen, The Netherlands
| | | | - Tijs Ketelaar
- Laboratory of Cell Biology, Wageningen University and Research Centre, Wageningen, The Netherlands
| | - André A. M. van Lammeren
- Laboratory of Cell Biology, Wageningen University and Research Centre, Wageningen, The Netherlands
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10
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Chavaroche AAE, van den Broek LAM, Boeriu C, Eggink G. Synthesis of heparosan oligosaccharides by Pasteurella multocida PmHS2 single-action transferases. Appl Microbiol Biotechnol 2011; 95:1199-210. [PMID: 22198719 PMCID: PMC3418500 DOI: 10.1007/s00253-011-3813-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [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: 10/12/2011] [Revised: 11/29/2011] [Accepted: 12/01/2011] [Indexed: 12/15/2022]
Abstract
Pasteurella multocida heparosan synthase PmHS2 is a dual action glycosyltransferase that catalyzes the polymerization of heparosan polymers in a non-processive manner. The two PmHS2 single-action transferases, obtained previously by site-directed mutagenesis, have been immobilized on Ni(II)-nitrilotriacetic acid agarose during the purification step. A detailed study of the polymerization process in the presence of non-equal amounts of PmHS2 single-action transferases revealed that the glucuronyl transferase (PmHS2-GlcUA(+)) is the limiting catalyst in the polymerization process. Using experimental design, it was determined that the N-acetylglucosaminyl transferase (PmHS2-GlcNAc(+)) plays an important role in the control of heparosan chain elongation depending on the number of heparosan chains and the UDP-sugar concentrations present in the reaction mixture. Furthermore, for the first time, the synthesis of heparosan oligosaccharides alternately using PmHS2-GlcUA(+) and PmHS2-GlcNAc(+) is reported. It was shown that the synthesis of heparosan oligosaccharides by PmHS2 single-action transferases do not require the presence of template molecules in the reaction mixture.
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Affiliation(s)
- Anaïs A E Chavaroche
- Bioprocess Engineering Group, Wageningen University and Research Center, P.O. Box 8129, 6700 EV, Wageningen, the Netherlands
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Chavaroche AAE, van den Broek LAM, Springer J, Boeriu C, Eggink G. Analysis of the polymerization initiation and activity of Pasteurella multocida heparosan synthase PmHS2, an enzyme with glycosyltransferase and UDP-sugar hydrolase activity. J Biol Chem 2010; 286:1777-85. [PMID: 21084307 DOI: 10.1074/jbc.m110.136754] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Heparosan synthase catalyzes the polymerization of heparosan (-4GlcUAβ1-4GlcNAcα1-)(n) by transferring alternatively the monosaccharide units from UDP-GlcUA and UDP-GlcNAc to an acceptor molecule. Details on the heparosan chain initiation by Pasteurella multocida heparosan synthase PmHS2 and its influence on the polymerization process have not been reported yet. By site-directed mutagenesis of PmHS2, the single action transferases PmHS2-GlcUA(+) and PmHS2-GlcNAc(+) were obtained. When incubated together in the standard polymerization conditions, the PmHS2-GlcUA(+)/PmHS2-GlcNAc(+) showed comparable polymerization properties as determined for PmHS2. We investigated the first step occurring in heparosan chain initiation by the use of the single action transferases and by studying the PmHS2 polymerization process in the presence of heparosan templates and various UDP-sugar concentrations. We observed that PmHS2 favored the initiation of the heparosan chains when incubated in the presence of an excess of UDP-GlcNAc. It resulted in a higher number of heparosan chains with a lower average molecular weight or in the synthesis of two distinct groups of heparosan chain length, in the absence or in the presence of heparosan templates, respectively. These data suggest that PmHS2 transfers GlcUA from UDP-GlcUA moiety to a UDP-GlcNAc acceptor molecule to initiate the heparosan polymerization; as a consequence, not only the UDP-sugar concentration but also the amount of each UDP-sugar is influencing the PmHS2 polymerization process. In addition, it was shown that PmHS2 hydrolyzes the UDP-sugars, UDP-GlcUA being more degraded than UDP-GlcNAc. However, PmHS2 incubated in the presence of both UDP-sugars favors the synthesis of heparosan polymers over the hydrolysis of UDP-sugars.
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Affiliation(s)
- Anais A E Chavaroche
- Bioprocess Engineering Group, Wageningen University and Research Center, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
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van Boxtel EL, van den Broek LAM, Koppelman SJ, Gruppen H. Legumin allergens from peanuts and soybeans: effects of denaturation and aggregation on allergenicity. Mol Nutr Food Res 2008; 52:674-82. [PMID: 18338408 DOI: 10.1002/mnfr.200700299] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Legumin proteins Ara h 3 from peanuts and glycinin from soybeans are increasingly described as important allergens. The stability of an allergen's IgE binding capacity towards heating and digestion is considered an important characteristic for food allergens. We investigated the effects of heating and digestion on the IgE binding of Ara h 3 and glycinin. Both proteins are relatively stable to denaturation, having denaturation temperatures ranging from 70 to 92 degrees C, depending on their quaternary structure and the ionic strength. Aggregates were formed upon heating, which were partly soluble for glycinin. Heating slightly decreased the pepsin digestion rate of both allergens. However, heating did not affect the IgE binding capacity of the hydrolyzates, as after only 10 min of hydrolysis no IgE binding could be detected any more in all samples. Peanut allergen Ara h 1, when digested under equal conditions, still showed IgE binding after 2 h of hydrolysis. Our results indicate that the IgE binding capacity of legumin allergens from peanuts and soybeans does not withstand peptic digestion. Consequently, these allergens are likely unable to sensitize via the gastro-intestinal tract and cause systemic food allergy symptoms. These proteins might thus be less important allergens than was previously assumed.
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Affiliation(s)
- Evelien L van Boxtel
- Laboratory of Food Chemistry, Wageningen University, EV Wageningen, The Netherlands
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van Boxtel EL, Koppelman SJ, van den Broek LAM, Gruppen H. Determination of pepsin-susceptible and pepsin-resistant epitopes in native and heat-treated peanut allergen Ara h 1. J Agric Food Chem 2008; 56:2223-2230. [PMID: 18298062 DOI: 10.1021/jf072907n] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
This study was aimed at the determination of the pepsin-susceptible and pepsin-resistant epitopes in native and heat-treated Ara h 1, a major allergen from peanuts. Both the oligomeric structure and the trimeric structure of the allergen were investigated. Under the in vitro conditions applied, oligomeric Ara h 1, either unheated or preheated, was hydrolyzed by pepsin at a lower rate than trimeric Ara h 1. Peptides with relatively high molecular masses were shown to be able to bind IgE, whereas peptides with lower molecular masses (<2 kDa) did not. In these latter fractions, fragments of 15 previously published epitopes of mature Ara h 1 were identified. As a result, these epitopes are not likely responsible for the induction of systemic food allergic reactions to peanuts. Using sequential chymotrypsin digestion, the pepsin-resistant IgE-binding peptides were deduced to contain the previously identified intact epitopes EDWRRPSHQQ (amino acids 50-59) and PRKIRPEG (amino acids 60-67). The presence of four additional earlier published intact epitopes (covering amino acids 6-13, 14-21, 24-31, and 40-47) on the pepsin-resistant peptides could be neither deduced nor ruled out. The two deduced and four possible pepsin-resistant epitopes are all situated in the N-terminal part of Ara h 1, which does not show homology with other vicilin proteins. Consequently, this unique N-terminal part of Ara h 1 is proposed to be responsible for the allergen's ability to induce systemic allergic reactions.
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Affiliation(s)
- Evelien L van Boxtel
- Laboratory of Food Chemistry, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
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van den Broek LAM, Hinz SWA, Beldman G, Vincken JP, Voragen AGJ. Bifidobacterium carbohydrases-their role in breakdown and synthesis of (potential) prebiotics. Mol Nutr Food Res 2008; 52:146-63. [PMID: 18040988 DOI: 10.1002/mnfr.200700121] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
There is an increasing interest to positively influence the human intestinal microbiota through the diet by the use of prebiotics and/or probiotics. It is anticipated that this will balance the microbial composition in the gastrointestinal tract in favor of health promoting genera such as Bifidobacterium and Lactobacillus. Carbohydrates like non-digestible oligosaccharides are potential prebiotics. To understand how these bacteria can grow on these carbon sources, knowledge of the carbohydrate-modifying enzymes is needed. Little is known about the carbohydrate-modifying enzymes of bifidobacteria. The genome sequence of Bifidobacterium adolescentis and Bifidobacterium longum biotype longum has been completed and it was observed that for B. longum biotype longum more than 8% of the annotated genes were involved in carbohydrate metabolism. In addition more sequence data of individual carbohydrases from other Bifidobacterium spp. became available. Besides the degradation of (potential) prebiotics by bifidobacterial glycoside hydrolases, we will focus in this review on the possibilities to produce new classes of non-digestible oligosaccharides by showing the presence and (transglycosylation) activity of the most important carbohydrate modifying enzymes in bifidobacteria. Approaches to use and improve carbohydrate-modifying enzymes in prebiotic design will be discussed.
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van Boxtel EL, van den Broek LAM, Koppelman SJ, Vincken JP, Gruppen H. Peanut allergen Ara h 1 interacts with proanthocyanidins into higher molecular weight complexes. J Agric Food Chem 2007; 55:8772-8. [PMID: 17883255 DOI: 10.1021/jf071585k] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Mildly extracted peanut allergen Ara h 1 was previously reported to occur as an oligomeric complex. In this paper we describe how the protein in this oligomeric complex interacts noncovalently with phenolic compounds of the proanthocyanidin type. These interactions are being disrupted during anion exchange chromatography, resulting in the dissociation of the oligomeric Ara h 1 complex into protein trimers. By use of the known three-dimensional structure of beta-conglycinin, a soy protein homologous to Ara h 1, proline-rich regions were observed in silico on both faces of its trimeric structure, which are conserved in Ara h 1. These proline-rich regions could explain the binding of proanthocyanidins to Ara h 1 and the formation of multiple Ara h 1 trimer complexes. This was supported by the observation that the addition of peanut proanthocyanidins to trimeric Ara h 1 and to beta-conglycinin resulted in the formation of soluble oligomeric protein complexes. The structurally related legumin proteins do not contain such proline-rich regions on both sides of the protein, and proanthocyanidins were shown to have a lower affinity for legumin proteins from peanuts and soybeans (peanut allergen Ara h 3 and soy glycinin, respectively). Ara h 1 present as the oligomeric complex is assumed to be the representative form of the allergen in which it is consumed by humans.
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Affiliation(s)
- Evelien L van Boxtel
- Laboratory of Food Chemistry, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
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Mirza O, Skov LK, Sprogøe D, van den Broek LAM, Beldman G, Kastrup JS, Gajhede M. Structural Rearrangements of Sucrose Phosphorylase from Bifidobacterium adolescentis during Sucrose Conversion. J Biol Chem 2006; 281:35576-84. [PMID: 16990265 DOI: 10.1074/jbc.m605611200] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The reaction mechanism of sucrose phosphorylase from Bifidobacterium adolescentis (BiSP) was studied by site-directed mutagenesis and x-ray crystallography. An inactive mutant of BiSP (E232Q) was co-crystallized with sucrose. The structure revealed a substrate-binding mode comparable with that seen in other related sucrose-acting enzymes. Wild-type BiSP was also crystallized in the presence of sucrose. In the dimeric structure, a covalent glucosyl intermediate was formed in one molecule of the BiSP dimer, and after hydrolysis of the glucosyl intermediate, a beta-D-glucose product complex was formed in the other molecule. Although the overall structure of the BiSP-glucosyl intermediate complex is similar to that of the BiSP(E232Q)-sucrose complex, the glucose complex discloses major differences in loop conformations. Two loops (residues 336-344 and 132-137) in the proximity of the active site move up to 16 and 4 A, respectively. On the basis of these findings, we have suggested a reaction cycle that takes into account the large movements in the active-site entrance loops.
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Affiliation(s)
- Osman Mirza
- Biostructural Research Unit, Department of Medicinal Chemistry, Danish University of Pharmaceutical Sciences, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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van Boxtel EL, van Beers MMC, Koppelman SJ, van den Broek LAM, Gruppen H. Allergen Ara h 1 occurs in peanuts as a large oligomer rather than as a trimer. J Agric Food Chem 2006; 54:7180-6. [PMID: 16968080 DOI: 10.1021/jf061433+] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Ara h 1, a major peanut allergen, is known as a stable trimeric protein. Nevertheless, upon purification of native Ara h 1 from peanuts using only size exclusion chromatography, the allergen appeared to exist in an oligomeric structure, rather than as a trimeric structure. The oligomeric structure was independent of the salt concentration applied. Subjecting the allergen to anion exchange chromatography induced the allergen to dissociate into trimers. Ammonium sulfate precipitation did not bring about any structural changes, whereas exposing the allergen to hydrophobic interaction chromatography caused it to partly dissociate into trimers, with increasing amounts of trimers at higher ionic strengths. The (partial) dissociation into trimers led to a change in the tertiary structure of the monomeric subunits of the allergen, with the monomers in Ara h 1 oligomers having a more compact tertiary structure compared with the monomers in Ara h 1 trimers. As structural characteristics are important for a protein's allergenicity, this finding may imply a different allergenicity for Ara h 1 than previously described.
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Affiliation(s)
- Evelien L van Boxtel
- Laboratory of Food Chemistry, Wageningen University, PO Box 8129, 6700 EV Wageningen, The Netherlands
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van Boxtel EL, van Koningsveld GA, Koppelman SJ, van den Broek LAM, Voragen AGJ, Gruppen H. Expanded bed adsorption as a fast technique for the large-scale purification of the complete isoform pool of Ber e 1, the major allergen from Brazil nuts. Mol Nutr Food Res 2006; 50:275-81. [PMID: 16521161 DOI: 10.1002/mnfr.200500203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A new, fast, large-scale purification method for Ber e 1, the major allergen from Brazil nuts, using expanded bed adsorption (EBA) chromatography, is presented. Using EBA, crude extracts can be applied to a fluidized column, which allows the unhindered passage of particulate impurities, thereby avoiding time-consuming centrifugation or filtration steps. With this new purification method, 2.8 g of Ber e 1 was obtained from 85 g defatted Brazil nut meal, essentially within 1 day. Various structural as well as immunochemical characteristics of the purified protein were determined, and compared to those of Ber e 1 purified using conventional chromatographic techniques. The complete pool of Ber e 1 isoforms was collected using EBA. The most abundant isoforms were observed to have pI around 8 and heterogeneity was observed in both the large and the small subunit of the heterodimeric protein. Ber e 1 has a highly ordered secondary structure. No apparent differences in immune reactivity were observed between EBA purified Ber e 1 and conventionally purified Ber e 1, using IgE-binding experiments. Thus, using EBA, Ber e 1 can be purified fast and on gram-scale, while having purity equal to that of conventionally purified Ber e 1.
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Hinz SWA, Doeswijk-Voragen CHL, Schipperus R, van den Broek LAM, Vincken JP, Voragen AGJ. Increasing the transglycosylation activity of α-galactosidase fromBifidobacterium adolescentisDSM 20083 by site-directed mutagenesis. Biotechnol Bioeng 2006; 93:122-31. [PMID: 16320365 DOI: 10.1002/bit.20713] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The alpha-galactosidase (AGA) from Bifidobacterium adolescentis DSM 20083 has a high transglycosylation activity. The optimal conditions for this activity are pH 8, and 37 degrees C. At high melibiose concentration (600 mM), approximately 64% of the enzyme-substrate encounters resulted in transglycosylation. Examination of the acceptor specificity showed that AGA required a hydroxyl group at C-6 for transglycosylation. Pentoses, hexuronic acids, deoxyhexoses, and alditols did not serve as acceptor molecules. Disaccharides were found to be good acceptors. A putative 3D-structure of the catalytic site of AGA was obtained by homology modeling. Based on this structure and amino acid sequence alignments, site-directed mutagenesis was performed to increase the transglycosylation efficiency of the enzyme, which resulted in four positive mutants. The positive single mutations were combined, resulting in six double mutants. The mutant H497M had an increase in transglycosylation of 16%, whereas most of the single mutations showed an increase of 2%-5% compared to the wild-type AGA. The double mutants G382C-Y500L, and H497M-Y500L had an increase in transglycosylation activity of 10%-16%, compared to the wild-type enzyme, whereas the increase for the other double mutants was low (4%-7%). The results show that with a single mutation (H497M) the transglycosylation efficiency can be increased from 64% to 75% of all enzyme-substrate encounters. Combining successful single mutants in double mutations did not necessarily result in an extra increase in transglycosylation efficiency. The donor and acceptor specificity did not change in the mutants, whereas the thermostability of the mutants with G382C decreased drastically.
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Affiliation(s)
- Sandra W A Hinz
- Laboratory of Food Chemistry, Wageningen University, PO Box 8129, The Netherlands
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Hinz SWA, Pastink MI, van den Broek LAM, Vincken JP, Voragen AGJ. Bifidobacterium longum endogalactanase liberates galactotriose from type I galactans. Appl Environ Microbiol 2005; 71:5501-10. [PMID: 16151143 PMCID: PMC1214609 DOI: 10.1128/aem.71.9.5501-5510.2005] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A putative endogalactanase gene classified into glycoside hydrolase family 53 was revealed from the genome sequence of Bifidobacterium longum strain NCC2705 (Schell et al., Proc. Natl. Acad. Sci. USA 99:14422-14427, 2002). Since only a few endo-acting enzymes from bifidobacteria have been described, we have cloned this gene and characterized the enzyme in detail. The deduced amino acid sequence suggested that this enzyme was located extracellularly and anchored to the cell membrane. galA was cloned without the transmembrane domain into the pBluescript SK(-) vector and expressed in Escherichia coli. The enzyme was purified from the cell extract by anion-exchange and size exclusion chromatography. The purified enzyme had a native molecular mass of 329 kDa, and the subunits had a molecular mass of 94 kDa, which indicated that the enzyme occurred as a tetramer. The optimal pH of endogalactanase activity was 5.0, and the optimal temperature was 37 degrees C, using azurine-cross-linked galactan (AZCL-galactan) as a substrate. The K(m) and V(max) for AZCL-galactan were 1.62 mM and 99 U/mg, respectively. The enzyme was able to liberate galactotrisaccharides from (beta1-->4)galactans and (beta1-->4)galactooligosaccharides, probably by a processive mechanism, moving toward the reducing end of the galactan chain after an initial midchain cleavage. GalA's mode of action was found to be different from that of an endogalactanase from Aspergillus aculeatus. The enzyme seemed to be able to cleave (beta1-->3) linkages. Arabinosyl side chains in, for example, potato galactan hindered GalA.
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Affiliation(s)
- Sandra W. A. Hinz
- Laboratory of Food Chemistry, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
| | - Marieke I. Pastink
- Laboratory of Food Chemistry, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
| | | | - Jean-Paul Vincken
- Laboratory of Food Chemistry, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
| | - Alphons G. J. Voragen
- Laboratory of Food Chemistry, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
- Corresponding author. Mailing address: Laboratory of Food Chemistry, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands. Phone: 31 317 483209. Fax: 31 317 484893. E-mail:
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Pouvreau L, Kroef T, Gruppen H, van Koningsveld G, van den Broek LAM, Voragen AGJ. Structure and stability of the potato cysteine protease inhibitor group (cv. Elkana). J Agric Food Chem 2005; 53:5739-46. [PMID: 15998142 DOI: 10.1021/jf050306v] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The conformational stability of potato cysteine protease inhibitor (PCPI), the second most abundant protease inhibitor group in potato tuber, was investigated at ambient temperature and upon heating using far- and near-UV circular dichroism spectroscopy, fluorescence spectroscopy, and differential scanning calorimetry (DSC). The PCPI isoforms investigated have a highly similar structure at both the secondary and the tertiary level. PCPI isoforms show structural properties similar to those of the potato serine protease inhibitor group and the Kunitz type soybean trypsin inhibitor, a known beta-II protein. Therefore, PCPI isoforms are also classified as members of the beta-II protein subclass. Results show that the thermal unfolding of PCPI isoforms does not follow a two-state mechanism and that at least one intermediate is present. The occurrence of this intermediate is most apparent in the thermal unfolding of PCPI 8.3 as indicated by the presence of two peaks in the DSC thermogram. Additionally, the formation of aggregates (>100 kDa), especially at low scan rates, increases the apparent cooperativity of the unfolding.
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Affiliation(s)
- Laurice Pouvreau
- Department of Agrotechnology and Food Sciences, Laboratory of Food Chemistry, Wageningen University, 6700 EV Wageningen, The Netherlands
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Pouvreau L, Gruppen H, van Koningsveld G, van den Broek LAM, Voragen AGJ. Conformational stability of the potato serine protease inhibitor group. J Agric Food Chem 2005; 53:3191-3196. [PMID: 15826077 DOI: 10.1021/jf048353v] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The thermal unfolding of potato serine protease inhibitor (PSPI), the most abundant protease inhibitor group in potato tuber, was measured using far UV CD spectroscopy, fluorescence spectroscopy, and DSC. The results indicate that the thermal as well as the guanidinium-induced unfolding of PSPI occurs via a non-two-state mechanism in which at least one stable intermediate is present. Additionally, the occurrence of aggregation, especially at low scan rates, increases the apparent cooperativity of the unfolding and makes the system kinetically rather than thermodynamically controlled. Aggregate formation seems to occur via a specific mechanism of which PSPI in a tetrameric form is the end product and which may involve disulfide interchanges.
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Affiliation(s)
- Laurice Pouvreau
- Centre for Protein Technology, TNO-WU, Post Office Box 8129, 6700 EV Wageningen, The Netherlands
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van den Broek LAM, Lloyd RM, Beldman G, Verdoes JC, McCleary BV, Voragen AGJ. Cloning and characterization of arabinoxylan arabinofuranohydrolase-D3 (AXHd3) from Bifidobacterium adolescentis DSM20083. Appl Microbiol Biotechnol 2005; 67:641-7. [PMID: 15650848 DOI: 10.1007/s00253-004-1850-9] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2004] [Revised: 11/17/2004] [Accepted: 11/18/2004] [Indexed: 11/29/2022]
Abstract
Arabinoxylan arabinofuranohydrolase-D3 (AXHd3) from Bifidobacterium adolescentis releases only C3-linked arabinose residues from double-substituted xylose residues. A genomic library of B. adolescentis DSM20083 was screened for the presence of the axhD3 gene. Two plasmids were identified containing part of the axhD3 gene. The nucleotide sequences were combined and three open reading frames (ORFs) were found. The first ORF showed high homology with xylanases belonging to family 8 of the glycoside hydrolases and this gene was designated xylA. The second ORF was the axhD3 gene belonging to glycoside hydrolase family 43. The third (partial) ORF coded for a putative carboxylesterase. The axhD3 gene was cloned and expressed in Escherichia coli. Several substrates were employed in the biochemical characterization of recombinant AXHd3. The enzyme showed the highest activity toward wheat arabinoxylan oligosaccharides. In addition, beta-xylanase from Trichoderma sp. was able to degrade soluble wheat arabinoxylan polymer to a higher extent, after pretreatment with recombinant AXHd3. Arabinoxylan oligosaccharides incubated with a combination of recombinant AXHd3 and an alpha-L-arabinofuranosidase from Aspergillus niger did not result in a higher maximal release of arabinose than incubation with these enzymes separately.
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Pouvreau L, Gruppen H, van Koningsveld GA, van den Broek LAM, Voragen AGJ. Tentative assignment of the potato serine protease inhibitor group as beta-II proteins based on their spectroscopic characteristics. J Agric Food Chem 2004; 52:7704-7710. [PMID: 15675823 DOI: 10.1021/jf0493932] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Potato serine protease inhibitor (PSPI) is the most abundant protease inhibitor group in potato tuber. The investigated PSPI isoforms have a highly similar structure at both the secondary and the tertiary level. From the results described, PSPI is classified as a beta-II protein based on (1) the presence in the near-UV spectra of sharp peaks, indicating a rigid and compact protein; (2) the sharp transition from the native to the unfolded state upon heating (only 6 degrees C) monitored by a circular dichroism signal at 222 nm; and (3) the similarity in secondary structure to soybean trypsin inhibitor, a known beta-II protein, as indicated by a similar far-UV CD spectrum and a similar amide I band in the IR spectrum. The conformation of PSPI was shown also to be stable at ambient temperature in the pH range 4-7.5. Upon lowering the pH to 3.0, some minor changes in the protein core occur, as observed from the increase of the intensity of the phenylalanine peak in the near-UV CD spectrum.
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Affiliation(s)
- Laurice Pouvreau
- Centre for Protein Technology TNO-WU, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
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van den Broek LAM, Pouvreau L, Lommerse G, Schipper B, Van Koningsveld GA, Gruppen H. Structural characterization of potato protease inhibitor I (Cv. Bintje) after expression in Pichia pastoris. J Agric Food Chem 2004; 52:4928-4934. [PMID: 15264937 DOI: 10.1021/jf049832x] [Citation(s) in RCA: 10] [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] [Indexed: 05/24/2023]
Abstract
In the present study the structural properties of potato protease inhibitor 1 (PI-1) were studied as a function of temperature to elucidate its precipitation mechanism upon heating. A cDNA coding for PI-1 from cv. Bintje was cloned and expressed in Pichia pastoris. Using the recombinant PI-1 it was suggested that PI-1 behaves as a hexameric protein rather than as a pentamer, as previously proposed in the literature. The recombinant protein seems either to have a predominantly unordered structure or to belong to the beta-II proteins. Differential scanning calorimetry analysis of PI-1 revealed that its thermal unfolding occurs via one endothermic transition in which the hexameric PI-1 probably unfolds, having a dimer instead of a monomer as cooperative unit. The transition temperature for the recombinant PI-1 was 88 degrees C. Similar results were obtained for a partially purified pool of native PI-1 from cv. Bintje.
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Sprogøe D, van den Broek LAM, Mirza O, Kastrup JS, Voragen AGJ, Gajhede M, Skov LK. Crystal Structure of Sucrose Phosphorylase fromBifidobacterium adolescentis†. Biochemistry 2004; 43:1156-62. [PMID: 14756551 DOI: 10.1021/bi0356395] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Around 80 enzymes are implicated in the generic starch and sucrose pathways. One of these enzymes is sucrose phosphorylase, which reversibly catalyzes the conversion of sucrose and orthophosphate to d-Fructose and alpha-d-glucose 1-phosphate. Here, we present the crystal structure of sucrose phosphorylase from Bifidobacterium adolescentis (BiSP) refined at 1.77 A resolution. It represents the first 3D structure of a sucrose phosphorylase and is the first structure of a phosphate-dependent enzyme from the glycoside hydrolase family 13. The structure of BiSP is composed of the four domains A, B, B', and C. Domain A comprises the (beta/alpha)(8)-barrel common to family 13. The catalytic active-site residues (Asp192 and Glu232) are located at the tips of beta-sheets 4 and 5 in the (beta/alpha)(8)-barrel, as required for family 13 members. The topology of the B' domain disfavors oligosaccharide binding and reduces the size of the substrate access channel compared to other family 13 members, underlining the role of this domain in modulating the function of these enzymes. It is remarkable that the fold of the C domain is not observed in any other known hydrolases of family 13. BiSP was found as a homodimer in the crystal, and a dimer contact surface area of 960 A(2) per monomer was calculated. The majority of the interactions are confined to the two B domains, but interactions between the loop 8 regions of the two barrels are also observed. This results in a large cavity in the dimer, including the entrance to the two active sites.
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Affiliation(s)
- Desiree Sprogøe
- Structural Biology Group, Department of Medicinal Chemistry, The Danish University of Pharmaceutical Sciences, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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Oomen RJFJ, Doeswijk-Voragen CHL, Bush MS, Vincken JP, Borkhardt B, van den Broek LAM, Corsar J, Ulvskov P, Voragen AGJ, McCann MC, Visser RGF. In muro fragmentation of the rhamnogalacturonan I backbone in potato (Solanum tuberosum L.) results in a reduction and altered location of the galactan and arabinan side-chains and abnormal periderm development. Plant J 2002; 30:403-13. [PMID: 12028571 DOI: 10.1046/j.1365-313x.2002.01296.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Rhamnogalacturonan (RG) I is a branched pectic polysaccharide in plant cell walls. Rhamnogalacturonan lyase (eRGL) from Aspergillus aculeatus is able to cleave the RG I backbone at specific sites. Transgenic potato (Solanum tuberosum L.) plants were made by the introduction of the gene encoding eRGL, under the control of the granule-bound starch synthase promoter. The eRGL protein was successfully expressed and translated into an active form, demonstrated by eRGL activity in the tuber extracts. The transgenic plants produced tubers with clear morphological alterations, including radial swelling of the periderm cells and development of intercellular spaces in the cortex. Sugar compositional analysis of the isolated cell walls showed a large reduction in galactosyl and arabinosyl residues in transgenic tubers. Immunocytochemical studies using the LM5 (galactan) and LM6 (arabinan) antibodies also showed a large reduction in galactan and arabinan side-chains of RG I. Most of the remaining LM5 epitopes were located in the expanded middle lamella at cell corners of eRGL tubers, which is in contrast to their normal location in the primary wall of wild type tubers. These data suggest that RG I has an important role in anchoring galactans and arabinans at particular regions in the wall and in normal development of the periderm.
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Affiliation(s)
- Ronald J F J Oomen
- Wageningen University, Laboratory of Plant Breeding, Binnenhaven 5, 6709 PD Wageningen, The Netherlands
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