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Visser N, Herreman LCM, Vandooren J, Pereira RVS, Opdenakker G, Spelbrink REJ, Wilbrink MH, Bremer E, Gosens R, Nawijn MC, van der Ende-Metselaar HH, Smit JM, Laus MC, Laman JD. Novel high-yield potato protease inhibitor panels block a wide array of proteases involved in viral infection and crucial tissue damage. J Mol Med (Berl) 2024; 102:521-536. [PMID: 38381158 DOI: 10.1007/s00109-024-02423-x] [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: 01/17/2024] [Revised: 01/17/2024] [Accepted: 01/22/2024] [Indexed: 02/22/2024]
Abstract
Viruses critically rely on various proteases to ensure host cell entry and replication. In response to viral infection, the host will induce acute tissue inflammation pulled by granulocytes. Upon hyperactivation, neutrophil granulocytes may cause undue tissue damage through proteolytic degradation of the extracellular matrix. Here, we assess the potential of protease inhibitors (PI) derived from potatoes in inhibiting viral infection and reducing tissue damage. The original full spectrum of potato PI was developed into five fractions by means of chromatography and hydrolysis. Individual fractions showed varying inhibitory efficacy towards a panel of proteases including trypsin, chymotrypsin, ACE2, elastase, and cathepsins B and L. The fractions did not interfere with SARS-CoV-2 infection of Vero E6 cells in vitro. Importantly, two of the fractions fully inhibited elastin-degrading activity of complete primary human neutrophil degranulate. These data warrant further development of potato PI fractions for biomedical purposes, including tissue damage crucial to SARS-CoV-2 pathogenesis. KEY MESSAGES: Protease inhibitor fractions from potato differentially inhibit a series of human proteases involved in viral replication and in tissue damage by overshoot inflammation. Protease inhibition of cell surface receptors such as ACE2 does not prevent virus infection of Vero cells in vitro. Protease inhibitors derived from potato can fully inhibit elastin-degrading primary human neutrophil proteases. Protease inhibitor fractions can be produced at high scale (hundreds of thousands of kilograms, i.e., tons) allowing economically feasible application in lower and higher income countries.
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Affiliation(s)
- Nienke Visser
- Department of Hematology, Cancer Research Center Groningen, University Medical Center Groningen, University of Groningen, 9713 GZ, Groningen, The Netherlands
| | | | - Jennifer Vandooren
- Laboratory of Immunobiology, Rega Institute for Medical Research, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000, Louvain, Belgium
| | - Rafaela Vaz Sousa Pereira
- Laboratory of Immunobiology, Rega Institute for Medical Research, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000, Louvain, Belgium
| | - Ghislain Opdenakker
- Laboratory of Immunobiology, Rega Institute for Medical Research, Department of Microbiology, Immunology and Transplantation, KU Leuven, 3000, Louvain, Belgium
| | | | | | - Edwin Bremer
- Department of Hematology, Cancer Research Center Groningen, University Medical Center Groningen, University of Groningen, 9713 GZ, Groningen, The Netherlands
| | - Reinoud Gosens
- Department of Molecular Pharmacology, University Medical Center Groningen, 9713 GZ, Groningen, The Netherlands
- Groningen Research Institute for Asthma and COPD (GRIAC) Research Institute, University of Groningen, 9713 GZ, Groningen, The Netherlands
| | - Martijn C Nawijn
- Groningen Research Institute for Asthma and COPD (GRIAC) Research Institute, University of Groningen, 9713 GZ, Groningen, The Netherlands
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, 9713 GZ, Groningen, The Netherlands
| | - Heidi H van der Ende-Metselaar
- Department of Medical Microbiology and Infection Prevention, University Medical Center Groningen, University of Groningen, 9713 GZ, Groningen, The Netherlands
| | - Jolanda M Smit
- Department of Medical Microbiology and Infection Prevention, University Medical Center Groningen, University of Groningen, 9713 GZ, Groningen, The Netherlands
| | - Marc C Laus
- Avebe Innovation Center Groningen, 9747 AW, Groningen, The Netherlands
| | - Jon D Laman
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, 9713 GZ, Groningen, The Netherlands.
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Herreman L, Nommensen P, Pennings B, Laus MC. Comprehensive overview of the quality of plant- And animal-sourced proteins based on the digestible indispensable amino acid score. Food Sci Nutr 2020; 8:5379-5391. [PMID: 33133540 PMCID: PMC7590266 DOI: 10.1002/fsn3.1809] [Citation(s) in RCA: 81] [Impact Index Per Article: 20.3] [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: 05/08/2020] [Revised: 07/07/2020] [Accepted: 07/14/2020] [Indexed: 01/10/2023] Open
Abstract
Indispensable amino acid (IAA) composition and standardized ileal digestibility (SID) of five animal- and 12 plant-based proteins were used to calculate their respective Digestible Indispensable Amino Score (DIAAS) according to the three age categories defined by the Food and Agriculture Organization (FAO). Mean IAA content and mean SID obtained from each protein dataset were subsequently used to simulate optimal nutritional quality of protein mixtures. Datasets revealed considerable variation in DIAAS within the same protein source and among different protein sources. Among the selected protein sources, and based on the 0.5- to 3-year-old reference pattern, pork meat, casein, egg, and potato proteins are classified as excellent quality proteins with an average DIAAS above 100. Whey and soy proteins are classified as high-quality protein with an average DIAAS ≥75. Gelatin, rapeseed, lupin, canola, corn, hemp, fava bean, oat, pea, and rice proteins are classified in the no quality claim category (DIAAS <75). Potato, soy, and pea proteins can complement a broad range of plant proteins, leading to higher DIAAS when supplied in the form of protein mixtures and at specific ratios. Such complementarity highlights the potential to achieve an optimal nutritional efficiency with plant proteins alone.
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Creusot N, Wierenga PA, Laus MC, Giuseppin ML, Gruppen H. Rheological properties of patatin gels compared with β-lactoglobulin, ovalbumin, and glycinin. J Sci Food Agric 2011; 91:253-261. [PMID: 20945510 DOI: 10.1002/jsfa.4178] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND The thermal unfolding and rheological properties of patatin gels were compared with those of commonly used proteins (β-lactoglobulin, ovalbumin, glycinin). RESULTS A significant difference between these proteins was observed in both the denaturation temperature (59 °C for patatin; about 20 °C lower than the other proteins) and the onset temperature of gel formation (50-60 °C, compared to 70-85 °C for the other proteins). At low ionic strength the minimal concentration was only 6% (w/v) for patatin, compared to 8-11% for the other proteins. This effect was attributed to the relatively high exposed hydrophobicity of patatin as determined by hydrophobic interaction chromatography. For gels compared at 'iso-strength', the frequency dependence was found to be close to identical, while small differences were observed in the strain at fracture. CONCLUSIONS Patatin was found to form gels with comparable small-deformational rheological properties as typical food proteins. In addition, at concentrations where the elastic modulus was similar for all proteins, the frequency and strain dependence were also comparable. From this it is concluded that patatin is a promising protein to be used in food applications as a gelling agent.
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Affiliation(s)
- Nathalie Creusot
- Laboratory of Food Chemistry, Wageningen University, 6700 EV Wageningen, The Netherlands
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Laus MC, Logman TJ, Lamers GE, Van Brussel AAN, Carlson RW, Kijne JW. A novel polar surface polysaccharide from Rhizobium leguminosarum binds host plant lectin. Mol Microbiol 2006; 59:1704-13. [PMID: 16553877 DOI: 10.1111/j.1365-2958.2006.05057.x] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.1] [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: 11/30/2022]
Abstract
Rhizobium bacteria produce different surface polysaccharides which are either secreted in the growth medium or contribute to a capsule surrounding the cell. Here, we describe isolation and partial characterization of a novel high molecular weight surface polysaccharide from a strain of Rhizobium leguminosarum that nodulates Pisum sativum (pea) and Vicia sativa (vetch) roots. Carbohydrate analysis showed that the polysaccharide consists for 95% of mannose and glucose, with minor amounts of galactose and rhamnose. Lectin precipitation analysis revealed high binding affinity of pea and vetch lectin for this polysaccharide, in contrast to the other known capsular and extracellular polysaccharides of this strain. Expression of the polysaccharide was independent of the presence of a Sym plasmid or the nod gene inducer naringenin. Incubation of R. leguminosarum with labelled pea lectin showed that this polysaccharide is exclusively localized on one of the poles of the bacterial cell. Vetch roots incubated with rhizobia and labelled pea lectin revealed that this bacterial pole is involved in attachment to the root surface. A mutant strain deficient in the production of this polysaccharide was impaired in attachment and root hair infection under slightly acidic conditions, in contrast to the situation at slightly alkaline conditions. Our data are consistent with the hypothesis that rhizobia can use (at least) two mechanisms for docking at the root surface, with use of a lectin-glycan mechanism under slightly acidic conditions.
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Affiliation(s)
- Marc C Laus
- Institute of Biology, Leiden University, the Netherlands
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Laus MC, van Brussel AAN, Kijne JW. Exopolysaccharide structure is not a determinant of host-plant specificity in nodulation of Vicia sativa roots. Mol Plant Microbe Interact 2005; 18:1123-9. [PMID: 16353547 DOI: 10.1094/mpmi-18-1123] [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: 05/05/2023]
Abstract
Exopolysaccharide (EPS)-deficient strains of the root nodule symbiote Rhizobium leguminosarum induce formation of abortive infection threads in Vicia sativa subsp. nigra roots. As a result, the nodule tissue remains uninfected. Formation of an infection thread can be restored by coinoculation of the EPS-deficient mutant with a Nod factor-deficient strain, which produces a similar EPS structure. This suggests that EPS contributes to host-plant specificity of nodulation. Here, a comparison was made of i) coinoculation with heterologous strains with different EPS structures, and ii) introduction of the pRL1JI Sym plasmid or a nod gene-encoding fragment in the same heterologous strains. Most strains not complementing in coinoculation experiments were able to nodulate V. sativa roots as transconjugants. Apparently, coinoculation is a delicate approach in which differences in root colonization ability or bacterial growth rate easily affect successful infection-thread formation. Obviously, lack of infection-thread formation in coinoculation studies is not solely determined by EPS structure. Transconjugation data show that different EPS structures can allow infection-thread formation and subsequent nodulation of V. sativa roots.
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Affiliation(s)
- Marc C Laus
- Institute of Biology Leiden, Leiden University, The Netherlands
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Laus MC, van Brussel AAN, Kijne JW. Role of cellulose fibrils and exopolysaccharides of Rhizobium leguminosarum in attachment to and infection of Vicia sativa root hairs. Mol Plant Microbe Interact 2005; 18:533-8. [PMID: 15986922 DOI: 10.1094/mpmi-18-0533] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Infection and subsequent nodulation of legume host plants by the root nodule symbiote Rhizobium leguminosarum usually require attachment of the bacteria to root-hair tips. Bacterial cellulose fibrils have been shown to be involved in this attachment process but appeared not to be essential for successful nodulation. Detailed analysis of Vicia sativa root-hair infection by wild-type Rhizobium leguminosarum RBL5523 and its cellulose fibril-deficient celE mutant showed that wild-type bacteria infected elongated growing root hairs, whereas cellulose-deficient bacteria infected young emerging root hairs. Exopolysaccharide-deficient strains that retained the ability to produce cellulose fibrils could also infect elongated root hairs but infection thread colonization was defective. Cellulose-mediated agglutination of these bacteria in the root-hair curl appeared to prevent entry into the induced infection thread. Infection experiments with V sativa roots and an extracellular polysaccharide (EPS)- and cellulose-deficient double mutant showed that cellulose-mediated agglutination of the EPS-deficient bacteria in the infection thread was now abolished and that infection thread colonization was partially restored. Interestingly, in this case, infection threads were initiated in root hairs that originated from the cortical cell layers of the root and not in epidermal root hairs. Apparently, surface polysaccharides of R. leguminosarum, such as cellulose fibrils, are determining factors for infection of different developmental stages of root hairs.
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Affiliation(s)
- M C Laus
- Institute of Biology Leiden, Leiden University, Wassenaarseweg 64, 2333AL Leiden, The Netherlands.
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Laus MC, Logman TJ, Van Brussel AAN, Carlson RW, Azadi P, Gao MY, Kijne JW. Involvement of exo5 in production of surface polysaccharides in Rhizobium leguminosarum and its role in nodulation of Vicia sativa subsp. nigra. J Bacteriol 2004; 186:6617-25. [PMID: 15375143 PMCID: PMC516619 DOI: 10.1128/jb.186.19.6617-6625.2004] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [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
Analysis of two exopolysaccharide-deficient mutants of Rhizobium leguminosarum, RBL5808 and RBL5812, revealed independent Tn5 transposon integrations in a single gene, designated exo5. As judged from structural and functional homology, this gene encodes a UDP-glucose dehydrogenase responsible for the oxidation of UDP-glucose to UDP-glucuronic acid. A mutation in exo5 affects all glucuronic acid-containing polysaccharides and, consequently, all galacturonic acid-containing polysaccharides. Exo5-deficient rhizobia do not produce extracellular polysaccharide (EPS) or capsular polysaccharide (CPS), both of which contain glucuronic acid. Carbohydrate composition analysis and nuclear magnetic resonance studies demonstrated that EPS and CPS from the parent strain have very similar structures. Lipopolysaccharide (LPS) molecules produced by the mutant strains are deficient in galacturonic acid, which is normally present in the core and lipid A portions of the LPS. The sensitivity of exo5 mutant rhizobia to hydrophobic compounds shows the involvement of the galacturonic acid residues in the outer membrane structure. Nodulation studies with Vicia sativa subsp. nigra showed that exo5 mutant rhizobia are impaired in successful infection thread colonization. This is caused by strong agglutination of EPS-deficient bacteria in the root hair curl. Root infection could be restored by simultaneous inoculation with a Nod factor-defective strain which retained the ability to produce EPS and CPS. However, in this case colonization of the nodule tissue was impaired.
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Affiliation(s)
- Marc C Laus
- Institute of Biology Leiden, Leiden University, Leiden, The Netherlands.
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Laus MC, Kijne JW. A Fixer's Dress Code: Surface Polysaccharides and Host-Plant-Specificity in the Root Nodule Symbiosis. TRENDS GLYCOSCI GLYC 2004. [DOI: 10.4052/tigg.16.281] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
BACKGROUND In human cells, the mitosis-inducing kinase Cdc2 is inhibited by phosphorylation on Thr14 and Tyr15. Disruption of these phosphorylation sites abrogates checkpoint-mediated regulation of Cdc2 and renders cells highly sensitive to agents that damage DNA. Phosphorylation of these sites is controlled by the opposing activities of the Wee1/Myt1 kinases and the Cdc25 phosphatase. The regulation of these enzymes is therefore likely to be crucial for the operation of the G2-M DNA-damage checkpoint. RESULTS Here, we show that the activity of Cdc25 decreased following exposure to ionizing radiation. The irradiation-induced decrease in Cdc25 activity was suppressed by wortmannin, an inhibitor of phosphatidylinositol (PI) 3-kinases, and was dependent on the function of the gene that is mutated in ataxia telangiectasia. We also identified two human kinases that phosphorylate and inactivate Cdc25 in vitro. One is the previously characterized Chk1 kinase. The second is novel and is homologous to the Cds1/Rad53 family of checkpoint kinases in yeast. Human Cds1 was found to be activated in response to DNA damage. CONCLUSIONS These results suggest that, in human cells, the DNA-damage checkpoint involves direct inactivation of Cdc25 catalyzed by Cds1 and/or Chk1.
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Affiliation(s)
- A Blasina
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA
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Parker AE, Van de Weyer I, Laus MC, Verhasselt P, Luyten WH. Identification of a human homologue of the Schizosaccharomyces pombe rad17+ checkpoint gene. J Biol Chem 1998; 273:18340-6. [PMID: 9660800 DOI: 10.1074/jbc.273.29.18340] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.1] [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: 11/06/2022] Open
Abstract
In the fission yeast Schizosaccharomyces pombe the rad17+ gene is required for both the DNA damage-dependent and the DNA replication-dependent cell cycle checkpoints. We have identified a human cDNA homologue of the S. pombe rad17+ checkpoint gene, designated Hrad17. Hrad17 has 49% identity to the S. pombe rad17+ sequence at the DNA level and 49% identity and 72% similarity at the amino acid level. Northern blot analysis indicates elevated levels of expression in testis and in cancer cell lines. Chromosomal localization by fluorescence in situ hybridization indicates that Hrad17 is located on chromosome 4q13.3-21.2. This region is subject to loss of heterozygosity in several human cancers. To begin to understand the protein-protein interactions of the human checkpoint machinery, we have used the yeast two-hybrid system to examine potential interactions between Hrad1, Hrad9, and Hrad17. We demonstrate a physical interaction between Hrad17 and Hrad1 but no interaction with Hrad9.
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Affiliation(s)
- A E Parker
- Department of Experimental Molecular Biology, Janssen Research Foundation, Turnhoutseweg 30, B-2340 Beerse, Belgium
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Parker AE, Van de Weyer I, Laus MC, Oostveen I, Yon J, Verhasselt P, Luyten WH. A human homologue of the Schizosaccharomyces pombe rad1+ checkpoint gene encodes an exonuclease. J Biol Chem 1998; 273:18332-9. [PMID: 9660799 DOI: 10.1074/jbc.273.29.18332] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.0] [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
In the fission yeast Schizosaccharomyces pombe the rad1(+) gene is required for both the DNA damage-dependent and the DNA replication-dependent cell cycle checkpoints. We have identified a human homologue of the S. pombe rad1(+) gene, designated Hrad1, as well as a mouse homologue: Mrad1. Two Hrad1 alternative splice variants with different open reading frames have been identified; one codes for a long form, Hrad1A, and the other encodes a short form because of N-terminal truncation, Hrad1B. Hrad1A has 60% identity to the S. pombe rad1+ sequence at the DNA level and 49% identity and 72% similarity at the amino acid level. Northern blot analysis indicates elevated levels of expression in testis and cancer cell lines. Chromosomal localization by fluorescence in situ hybridization indicates that Hrad1 is located on chromosome 5p13. 2-13.3. This region is subject to loss of heterozygosity in several human cancers. Hrad1 also shares homology with the Saccharomyces cerevisiae RAD17 and Ustilago maydis REC1 proteins. REC1 has previously been characterized as a 3' --> 5' exonuclease with a C-terminal domain essential for cell cycle checkpoint function. We have expressed and purified polyhistidine-tagged fusions of Hrad1A and Hrad1B and show that HisHrad1A has 3' --> 5' exonuclease activity, whereas HisHrad1B lacks such activity. The biological functions of the two proteins remain to be determined.
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Affiliation(s)
- A E Parker
- Department of Experimental Molecular Biology, Janssen Research Foundation, Turnhoutseweg 30, B-2340 Beerse, Belgium
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