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Le Montagner P, Guilbaud M, Miot-Sertier C, Brocard L, Albertin W, Ballestra P, Dols-Lafargue M, Renouf V, Moine V, Bellon-Fontaine MN, Masneuf-Pomarède I. High intraspecific variation of the cell surface physico-chemical and bioadhesion properties in Brettanomyces bruxellensis. Food Microbiol 2023; 112:104217. [PMID: 36906300 DOI: 10.1016/j.fm.2023.104217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 01/11/2023] [Accepted: 01/17/2023] [Indexed: 01/19/2023]
Abstract
Brettanomyces bruxellensis is the most damaging spoilage yeast in the wine industry because of its negative impact on the wine organoleptic qualities. The strain persistence in cellars over several years associated with recurrent wine contamination suggest specific properties to persist and survive in the environment through bioadhesion phenomena. In this work, the physico-chemical surface properties, morphology and ability to adhere to stainless steel were studied both on synthetic medium and on wine. More than 50 strains representative of the genetic diversity of the species were considered. Microscopy techniques made it possible to highlight a high morphological diversity of the cells with the presence of pseudohyphae forms for some genetic groups. Analysis of the physico-chemical properties of the cell surface reveals contrasting behaviors: most of the strains display a negative surface charge and hydrophilic behavior while the Beer 1 genetic group has a hydrophobic behavior. All strains showed bioadhesion abilities on stainless steel after only 3 h with differences in the concentration of bioadhered cells ranging from 2.2 × 102 cell/cm2 to 7.6 × 106 cell/cm2. Finally, our results show high variability of the bioadhesion properties, the first step in the biofilm formation, according to the genetic group with the most marked bioadhesion capacity for the beer group.
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Affiliation(s)
- Paul Le Montagner
- Univ. Bordeaux, INRAE, Bordeaux INP, Bordeaux Sciences Agro, OENO, UMR 1366, ISVV, 33140, Villenave d'Ornon, France; Laboratoire EXCELL, Floirac, France; Biolaffort, Floirac, France.
| | - Morgan Guilbaud
- Univ. Paris-Saclay, SayFood, AgroParisTech, INRAE UMR 782, 91300, Massy, France
| | - Cécile Miot-Sertier
- Univ. Bordeaux, INRAE, Bordeaux INP, Bordeaux Sciences Agro, OENO, UMR 1366, ISVV, 33140, Villenave d'Ornon, France
| | - Lysiane Brocard
- Univ. Bordeaux, Plant Imaging Platform, Bordeaux Imaging Center, UMS 3420, CNRS, 33000, Bordeaux, France
| | - Warren Albertin
- Univ. Bordeaux, INRAE, Bordeaux INP, Bordeaux Sciences Agro, OENO, UMR 1366, ISVV, 33140, Villenave d'Ornon, France; ENSCBP, Bordeaux INP, 33600, Pessac, France
| | - Patricia Ballestra
- Univ. Bordeaux, INRAE, Bordeaux INP, Bordeaux Sciences Agro, OENO, UMR 1366, ISVV, 33140, Villenave d'Ornon, France
| | - Marguerite Dols-Lafargue
- Univ. Bordeaux, INRAE, Bordeaux INP, Bordeaux Sciences Agro, OENO, UMR 1366, ISVV, 33140, Villenave d'Ornon, France; ENSCBP, Bordeaux INP, 33600, Pessac, France
| | | | | | | | - Isabelle Masneuf-Pomarède
- Univ. Bordeaux, INRAE, Bordeaux INP, Bordeaux Sciences Agro, OENO, UMR 1366, ISVV, 33140, Villenave d'Ornon, France; Bordeaux Sciences Agro, 33175, Gradignan, France
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Nwabuife JC, Hassan D, Madhaorao Pant A, Devnarain N, Gafar MA, Osman N, Rambharose S, Govender T. Novel vancomycin free base – Sterosomes for combating diseases caused by Staphylococcus aureus and Methicillin-resistant Staphylococcus aureus infections (S. Aureus and MRSA). J Drug Deliv Sci Technol 2023. [DOI: 10.1016/j.jddst.2022.104089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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3
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Antimicrobial mechanism of linalool against Brochothrix thermosphacta and its application on chilled beef. Food Res Int 2022; 157:111407. [PMID: 35761661 DOI: 10.1016/j.foodres.2022.111407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 05/10/2022] [Accepted: 05/22/2022] [Indexed: 11/20/2022]
Abstract
This work aimed to explore the antibacterial ability and potential mechanism of linalool against Brochothrix thermosphacta (B. thermosphacta), providing knowledge of the preservation of chilled beef with linalool. The results found that linalool had an encouraging inhibitory effect on B. thermosphacta with a minimum inhibitory concentration (MIC) of 1.5 mL/L. Results of FESEM and zeta potential combined with probe labeling confirmed that linalool destroyed the cell structure thereby causing the leakage of intracellular components (AKP, protein, nucleic acid and ion). In addition, linalool caused respiratory disturbance by measuring the key enzyme activities including PK, SDH, MDH and ATPase. Energy limitation also appeared under linalool stress as seen from changes in ATP content (decreased by 56.06% and 69.24% in MIC and 2MIC groups, respectively). The respiratory inhibition rate of linalool to B. thermosphacta was 23.58% and the superposing rate with malonic acid was minimal (35.52%), suggesting that respiratory depression was mainly caused by the TCA cycle. Furthermore, accumulation of ROS and increase in MDA content (increased by 71.17% and 78.03% in MIC and 2MIC groups, respectively) accompanied by decreased activities of detoxification enzymes CAT and POD suggested that oxidative stress contributed to the bactericidal mechanism. Finally, linalool has been shown to effectively inhibit quality deterioration of chilled beef during storage by measuring pH, TVB-N and TVC without affecting sensory acceptability. All these highlight the great promise of using linalool as natural preservative for food industry.
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Efficient preparation of phytase from genetically modified Pichia pastoris in immobilised fermentation biofilms adsorbed on surface-modified cotton fibres. Process Biochem 2021. [DOI: 10.1016/j.procbio.2021.10.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Omolo CA, Hassan D, Devnarain N, Jaglal Y, Mocktar C, Kalhapure RS, Jadhav M, Govender T. Formulation of pH responsive multilamellar vesicles for targeted delivery of hydrophilic antibiotics. Colloids Surf B Biointerfaces 2021; 207:112043. [PMID: 34416442 DOI: 10.1016/j.colsurfb.2021.112043] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 08/08/2021] [Accepted: 08/12/2021] [Indexed: 12/24/2022]
Abstract
Fight against antimicrobial resistance calls for innovative strategies that can target infection sites and enhance activity of antibiotics. Herein is a pH responsive multilamellar vesicles (MLVs) for targeting bacterial infection sites. The vancomycin (VCM) loaded MLVs had 62.25 ± 8.7 nm, 0.15 ± 0.01 and -5.55 ± 2.76 mV size, PDI and zeta potential, respectively at pH 7.4. The MLVs had a negative ZP at pH 7.4 that switched to a positive charge and faster release of the drug at acidic pH. The encapsulation efficiency was found to be 46.34 ± 3.88 %. In silico studies of the lipids, interaction suggested an energetically stable system. Studies to determine the minimum inhibitory concentration studies (MIC) showed the MLVs had 2-times and 8-times MIC against Staphylococcus aureus (SA) and Methicillin resistance SA respectively at physiological pH. While at pH 6.0 there was 8 times reduction in MICs for the formulation against SA and MRSA in comparison to the bare drug. Fluorescence-activated Cell Sorting (FACS) studies demonstrated that even with 8-times lower MIC, MLVs had a similar elimination ability of MRSA cells when compared to the bare drug. Fluorescence microscopy showed MLVs had the ability to clear biofilms while the bare drug could not. Mice skin infection models studies showed that the colony finding units (CFUs) of MRSA recovered from groups treated with MLVs was 4,050 and 525-fold lower than the untreated and bare VCM treated groups, respectively. This study demonstrated pH-responsive multilamellar vesicles as effective system for targeting and enhancing antibacterial agents.
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Affiliation(s)
- Calvin A Omolo
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag, Durban X54001, Durban, 4000, South Africa; Department of Pharmaceutics and Pharmacy Practice, School of Pharmacy and Health Sciences, United States International University-Africa, P. O. Box 14634-00800, Nairobi, Kenya.
| | - Daniel Hassan
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag, Durban X54001, Durban, 4000, South Africa
| | - Nikita Devnarain
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag, Durban X54001, Durban, 4000, South Africa
| | - Yajna Jaglal
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag, Durban X54001, Durban, 4000, South Africa
| | - Chunderika Mocktar
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag, Durban X54001, Durban, 4000, South Africa
| | - Rahul S Kalhapure
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag, Durban X54001, Durban, 4000, South Africa
| | - Mahantesh Jadhav
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag, Durban X54001, Durban, 4000, South Africa
| | - Thirumala Govender
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag, Durban X54001, Durban, 4000, South Africa.
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Boulton C. Provocation: all yeast cells are born equal, but some grow to be more equal than others. JOURNAL OF THE INSTITUTE OF BREWING 2021. [DOI: 10.1002/jib.647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hassan D, Omolo CA, Fasiku VO, Elrashedy AA, Mocktar C, Nkambule B, Soliman MES, Govender T. Formulation of pH-Responsive Quatsomes from Quaternary Bicephalic Surfactants and Cholesterol for Enhanced Delivery of Vancomycin against Methicillin Resistant Staphylococcus aureus. Pharmaceutics 2020; 12:E1093. [PMID: 33202629 PMCID: PMC7696852 DOI: 10.3390/pharmaceutics12111093] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 10/29/2020] [Accepted: 11/08/2020] [Indexed: 12/14/2022] Open
Abstract
Globally, human beings continue to be at high risk of infectious diseases caused by methicillin-resistant Staphylococcus aureus (MRSA); and current treatments are being depleted due to antimicrobial resistance. Therefore, the synthesis and formulation of novel materials is essential for combating antimicrobial resistance. The study aimed to synthesize a quaternary bicephalic surfactant (StBAclm) and thereof to formulate pH-responsive vancomycin (VCM)-loaded quatsomes to enhance the activity of the antibiotic against MRSA. The surfactant structure was confirmed using 1H, 13C nuclear magnetic resonance (NMR), Fourier-transform infrared spectroscopy (FT-IR), and high-resolution mass spectrometry (HRMS). The quatsomes were prepared using a sonication/dispersion method and were characterized using various in vitro, in vivo, and in silico techniques. The in vitro cell biocompatibility studies of the surfactant and pH-responsive vancomycin-loaded quatsomes (VCM-StBAclm-Qt1) revealed that they are biosafe. The prepared quatsomes had a mean hydrodynamic diameter (MHD), polydispersity index (PDI), and drug encapsulation efficiency (DEE) of 122.9 ± 3.78 nm, 0.169 ± 0.02 mV, and 52.22 ± 8.4%, respectively, with surface charge switching from negative to positive at pH 7.4 and pH 6.0, respectively. High-resolution transmission electron microscopy (HR-TEM) characterization of the quatsomes showed spherical vesicles with MHD similar to the one obtained from the zeta-sizer. The in vitro drug release of VCM from the quatsomes was faster at pH 6.0 compared to pH 7.4. The minimum inhibitory concentration (MIC) of the drug loaded quatsomes against MRSA was 32-fold and 8-fold lower at pH 6.0 and pH 7.4, respectively, compared to bare VCM, demonstrating the pH-responsiveness of the quatsomes and the enhanced activity of VCM at acidic pH. The drug-loaded quatsomes demonstrated higher electrical conductivity and a decrease in protein and deoxyribonucleic acid (DNA) concentrations as compared to the bare drug. This confirmed greater MRSA membrane damage, compared to treatment with bare VCM. The flow cytometry study showed that the drug-loaded quatsomes had a similar bactericidal killing effect on MRSA despite a lower (8-fold) VCM concentration when compared to the bare VCM. Fluorescence microscopy revealed the ability of the drug-loaded quatsomes to eradicate MRSA biofilms. The in vivo studies in a skin infection mice model showed that groups treated with VCM-loaded quatsomes had a 13-fold decrease in MRSA CFUs when compared to the bare VCM treated groups. This study confirmed the potential of pH-responsive VCM-StBAclm quatsomes as an effective delivery system for targeted delivery and for enhancing the activity of antibiotics.
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Affiliation(s)
- Daniel Hassan
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa; (D.H.); (V.O.F.); (A.A.E.); (C.M.); (M.E.S.S.)
| | - Calvin A. Omolo
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa; (D.H.); (V.O.F.); (A.A.E.); (C.M.); (M.E.S.S.)
- Department of Pharmaceutics and Pharmacy Practice, School of Pharmacy and Health Sciences, United States International University-Africa, P. O. Box 14634, Nairobi 00800, Kenya
| | - Victoria Oluwaseun Fasiku
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa; (D.H.); (V.O.F.); (A.A.E.); (C.M.); (M.E.S.S.)
| | - Ahmed A Elrashedy
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa; (D.H.); (V.O.F.); (A.A.E.); (C.M.); (M.E.S.S.)
| | - Chunderika Mocktar
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa; (D.H.); (V.O.F.); (A.A.E.); (C.M.); (M.E.S.S.)
| | - Bongani Nkambule
- Department of Physiology, School of Laboratory Medicine and Medical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa;
| | - Mahmoud E. S. Soliman
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa; (D.H.); (V.O.F.); (A.A.E.); (C.M.); (M.E.S.S.)
| | - Thirumala Govender
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa; (D.H.); (V.O.F.); (A.A.E.); (C.M.); (M.E.S.S.)
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Hassan D, Omolo CA, Fasiku VO, Mocktar C, Govender T. Novel chitosan-based pH-responsive lipid-polymer hybrid nanovesicles (OLA-LPHVs) for delivery of vancomycin against methicillin-resistant Staphylococcus aureus infections. Int J Biol Macromol 2020; 147:385-398. [PMID: 31926237 DOI: 10.1016/j.ijbiomac.2020.01.019] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 12/18/2019] [Accepted: 01/03/2020] [Indexed: 10/25/2022]
Abstract
The development of novel materials is necessary for adequate delivery of drugs to combat the Methicillin-resistant Staphylococcus aureus (MRSA) burden due to the limitations of conventional methods and challenges associated with antimicrobial resistance. Hence, this study aimed to synthesise a novel oleylamine based zwitterionic lipid (OLA) and explore its potential to formulate chitosan-based pH-responsive lipid-polymer hybrid nanovesicles (VM-OLA-LPHVs1) to deliver VM against MRSA. The OLA was synthesised, and the structure characterised by 1H NMR, 13C NMR, FT-IR and HR-MS. The preliminary biocompatibility of OLA and VM-OLA-LPHVs1 was evaluated on HEK-293, A-549, MCF-7 and HepG-2 cell lines using in vitro cytotoxicity assay. The VM-OLA-LPHVs1 were formulated by ionic gelation method and characterised in order to determine the hydrodynamic diameter (DH), morphology in vitro and in vivo antibacterial efficacy. The result of the in vitro cytotoxicity study revealed cell viability of above 75% in all cell lines when exposed to OLA and VM-OLA-LPHVs1, thus indicating their biosafety. The VM-OLA-LPHVs1 had a DH, polydispersity index (PDI), and EE% of 198.0 ± 14.04 nm, 0.137 ± 0.02, and 45.61 ± 0.54% respectively at physiological pH, with surface-charge (ζ) switching from negative at pH 7.4 to positive at pH 6.0. The VM release from the VM-OLA-LPHVs1 was faster at pH 6.0 compared to physiological pH, with 97% release after 72-h. The VM-OLA-LPHVs1 had a lower minimum inhibitory concentration (MIC) value of 0.59 μg/mL at pH 6.0 compared to 2.39 μg/mL at pH 7.4, against MRSA with 52.9-fold antibacterial enhancement. The flow cytometry study revealed that VM-OLA-LPHVs1 had similar bactericidal efficacy on MRSA compared to bare VM, despite an 8-fold lower VM concentration in the nanovesicles. Additionally, fluorescence microscopy study showed the ability of the VM-OLA-LPHVs1 to eliminate biofilms. The electrical conductivity, and protein/DNA concentration, increased and decreased respectively, as compared to bare VM which indicated greater MRSA membrane damage. The in vivo studies in a BALB/c mouse-infected skin model treated with VM-OLA-LPHVs1 revealed 95-fold lower MRSA burden compared to the group treated with bare VM. These findings suggest that OLA can be used as an effective novel material for complexation with biodegradable polymer chitosan (CHs) to form pH-responsive VM-OLA-LPHVs1 nanovesicles which show greater potential for enhancement and improvement of treatment of bacterial infections.
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Affiliation(s)
- Daniel Hassan
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban, South Africa
| | - Calvin A Omolo
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban, South Africa; United States International University-Africa, School of Pharmacy and Health Sciences, Department of Pharmaceutics, P. O. Box 14634-00800, Nairobi, Kenya.
| | - Victoria Oluwaseun Fasiku
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban, South Africa
| | - Chunderika Mocktar
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban, South Africa
| | - Thirumala Govender
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban, South Africa.
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Lin L, Liao X, Cui H. Cold plasma treated thyme essential oil/silk fibroin nanofibers against Salmonella Typhimurium in poultry meat. Food Packag Shelf Life 2019. [DOI: 10.1016/j.fpsl.2019.100337] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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10
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Antibacterial properties of nanofibers containing chrysanthemum essential oil and their application as beef packaging. Int J Food Microbiol 2018; 292:21-30. [PMID: 30553179 DOI: 10.1016/j.ijfoodmicro.2018.12.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 12/03/2018] [Accepted: 12/06/2018] [Indexed: 01/01/2023]
Abstract
This study was aimed to develop novel antibacterial packaging materials in order to reduce the microbial contamination of food surface. Chrysanthemum essential oil (CHEO) was successfully incorporated into chitosan nanofibers (CS/NF) through electrospinning which was demonstrated by SEM and AFM analysis. The antibacterial mechanism of CHEO against Listeria monocytogenes (L. monocytogenes) was explored as well. The cell membrane permeability of L. monocytogenes appeared to be increased by CHEO. In addition, respiratory metabolism of L. monocytogenes was inhibited by CHEO through the inhibition of the Embden-Meyerhof-Parnas (EMP) pathway. The presence of CHEO had a negative effect on the activity of hexokinase, phosphofructokinase and pyruvate kinase in L. monocytogenes cells. Release efficiency study indicated that the CHEO could be released slowly from CHEO/CS/NF to achieve long-lasting antibacterial effect. The antibacterial application of the CHEO nanofibers against L. monocytogenes was tested on beef, with an inhibition rate of 99.91%, 99.97%, and 99.95% at the temperature of 4 °C, 12 °C and 25 °C, respectively, after 7 days of storage. Beef parameters like thiobarbituric acid reactive substances (TBARS), pH values, and texture at different storage temperatures (4 °C, 12 °C and 25 °C) were evaluated as well. Due to the presence of antioxidant components in CHEO released from CHEO/CS/NF, the TBARS value in treated beef was 0.135 MDA/kg lower (P < 0.05) than the untreated sample at 4 °C after 12 days. PH value assay indicated that PH value of beef sample packed with CHEO/CS/NF (6.43) was lower than unpacked sample (7.05) at 4 °C after 10 days of storage. These obtained results all illustrated the fact that CHEO/CS/NF could prolong the shelf-life of beef, suggesting a potential application in food packaging.
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11
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Hu XQ, Liu Q, Hu JP, Zhou JJ, Zhang X, Peng SY, Peng LJ, Wang XD. Identification and characterization of probiotic yeast isolated from digestive tract of ducks. Poult Sci 2018; 97:2902-2908. [PMID: 29762784 DOI: 10.3382/ps/pey152] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 04/17/2018] [Indexed: 01/27/2023] Open
Abstract
The objective of this study was to isolate and identify yeast strains from the digestive tract of ducks, and evaluate in vitro their potential as probiotics in poultry. The yeast strains were isolated using malt extract agar medium, and identified through morphological, physiological, and biochemical tests as well as sequence homology analyses of 26S rDNA D1/D2 region. A total of 35 yeast strains were isolated from the guts of Cherry Valley meat ducks, including seven strains of Saccharomyces cerevisiae (S. cerevisiae). These seven strains of S. cerevisiae were further screened for their use as alternative yeast probiotics strains for poultry feed. The yeast strains were characterized for their cell surface hydrophobicity, autoaggregation ability, and resistance to high temperature (30°C, 37°C, and 42°C), low pH (2.0, 3.0, and 4.0), bile salts (0.3% and 0.6%), and nutrition starvation (2, 4, 6, 8, 10, and 12 days). The isolates of WHY-2 and WHY-7 had a higher survival percentage at 37°C, pH 2.0, 0.60% poultry bile salts, and 10 days of nutrition starvation, with higher cell surface hydrophobicity and autoaggregation, when compared with the other isolates, suggesting that the isolates WHY-2 and WHY-7, could be used as probiotic candidates. The data obtained in this study could help in selecting probiotic yeast candidates for use in poultry industry.
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Affiliation(s)
- X Q Hu
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, 68 Changqing Garden School Road, Wuhan City, Hubei Province, China, 430023
| | - Q Liu
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, 68 Changqing Garden School Road, Wuhan City, Hubei Province, China, 430023
| | - J P Hu
- Angel Yeast Co., Ltd., 168 East Avenue, Yichang City, Hubei Province, China, 443003
| | - J J Zhou
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, 68 Changqing Garden School Road, Wuhan City, Hubei Province, China, 430023
| | - X Zhang
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, 68 Changqing Garden School Road, Wuhan City, Hubei Province, China, 430023
| | - S Y Peng
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, 68 Changqing Garden School Road, Wuhan City, Hubei Province, China, 430023
| | - L J Peng
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, 68 Changqing Garden School Road, Wuhan City, Hubei Province, China, 430023
| | - X D Wang
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, 68 Changqing Garden School Road, Wuhan City, Hubei Province, China, 430023.,Wuhan Yongsheng Duck Industry Co., Ltd, Wuhan City, Hubei Province, China, 430334
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12
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Lin L, Mao X, Sun Y, Cui H. Antibacterial mechanism of artemisinin / beta-cyclodextrins against methicillin-resistant Staphylococcus aureus ( MRSA ). Microb Pathog 2018. [DOI: 10.1016/j.micpath.2018.03.014] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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14
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Kopecká J, Němec M, Matoulková D, Čejka P, Jelínková M, Felsberg J, Sigler K. Effect of Growth Conditions on Flocculation and Cell Surface Hydrophobicity of Brewing Yeast. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2018. [DOI: 10.1094/asbcj-2015-0324-01] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Jana Kopecká
- Department of Experimental Biology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
| | - Miroslav Němec
- Department of Experimental Biology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
| | - Dagmar Matoulková
- Research Institute of Brewing and Malting, Lípová 15, 120 44 Prague, Czech Republic
| | - Pavel Čejka
- Research Institute of Brewing and Malting, Lípová 15, 120 44 Prague, Czech Republic
| | - Markéta Jelínková
- Institute of Microbiology, Academy of Sciences of the Czech Republic, v.v.i., Vídeňská 1083, 142 20 Prague, Czech Republic
| | - Jürgen Felsberg
- Institute of Microbiology, Academy of Sciences of the Czech Republic, v.v.i., Vídeňská 1083, 142 20 Prague, Czech Republic
| | - Karel Sigler
- Institute of Microbiology, Academy of Sciences of the Czech Republic, v.v.i., Vídeňská 1083, 142 20 Prague, Czech Republic
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15
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Cui H, Bai M, Lin L. Plasma-treated poly(ethylene oxide) nanofibers containing tea tree oil/beta-cyclodextrin inclusion complex for antibacterial packaging. Carbohydr Polym 2017; 179:360-369. [PMID: 29111062 DOI: 10.1016/j.carbpol.2017.10.011] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/10/2017] [Accepted: 10/02/2017] [Indexed: 11/16/2022]
Abstract
This work describes the effect of cold nitrogen plasma to enhance the antibacterial activity of poly(ethylene oxide) (PEO) nanofibers containing antibacterial agent. Beta-cyclodextrin (β-CD) and tea tree oil (TTO) were used as a host-guest to form water-soluble inclusion complex. The encapsulation efficiency of TTO in inclusion complex could reach 73.23% at 60°C. As antibacterial agent, the inclusion complex was encapsulated into PEO matrix by electrospun. After plasma treatment, the release efficiency of antibacterial agent from PEO nanofibers was improved. As a result, the antibacterial activity of PEO nanofibers was enhanced accordingly. The plasma-treated nanofiber membranes achieved the highest antibacterial activity against Escherichia coli O157:H7, which was tested on the beef for 7d, with inhibition efficiently of 99.99% whether at 4°C or 12°C. The plasma-treated PEO nanofiber membranes containing TTO/β-CD inclusion complex (TTO/β-CD-IC) can prolong the shelf-life of beef, suggesting it has potential application in active food packaging.
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Affiliation(s)
- Haiying Cui
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Mei Bai
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Lin Lin
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China.
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16
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Zhuang W, Liu X, Yang J, Wu J, Zhou J, Chen Y, Liu D, Ying H. Immobilization of Clostridium acetobutylicum onto natural textiles and its fermentation properties. Microb Biotechnol 2017; 10:502-512. [PMID: 28112488 PMCID: PMC5328812 DOI: 10.1111/1751-7915.12557] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 10/25/2016] [Accepted: 11/14/2016] [Indexed: 11/30/2022] Open
Abstract
Immobilized fermentation has several advantages over traditional suspended fermentation, including simple and continuous operation, improved fermentation performance and reduced cost. Carrier is the most adjustable element among three elements of immobilized fermentation, including carrier, bacteria and environment. In this study, we characterized carrier roughness and surface properties of four types of natural fibres, including linen, cotton, bamboo fibre and silk, to assess their effects on cell immobilization, fermentation performance and stability. Linen with higher specific surface area and roughness could adsorb more bacteria during immobilized fermentation, thereby improving fermentation performance; thus, linen was selected as a suitable carrier and was applied for acetone–butanol–ethanol (ABE) fermentation. To further improve fermentation performance, we also found that microbes of Clostridium acetobutylicum were negatively charged surfaces during fermentation. Therefore, we then modified linen with polyetherimide (PEI) and steric acid (SA) to increase surface positive charge and improve surface property. During ABE fermentation, the adhesion between modified linen and bacteria was increased, adsorption was increased about twofold compared with that of unmodified linen, and butanol productivity was increased 8.16% and 6.80% with PEI‐ and SA‐modified linen as carriers respectively.
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Affiliation(s)
- Wei Zhuang
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, No. 5, Xinmofan Road, Nanjing, 210009, China.,College of Biotechnology and Pharmaceutical Engineering, National Engineering Technique Research Center for Biotechnology, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China.,Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China
| | - Xiaojing Liu
- College of Biotechnology and Pharmaceutical Engineering, National Engineering Technique Research Center for Biotechnology, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China
| | - Jing Yang
- College of Biotechnology and Pharmaceutical Engineering, National Engineering Technique Research Center for Biotechnology, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China
| | - Jinglan Wu
- College of Biotechnology and Pharmaceutical Engineering, National Engineering Technique Research Center for Biotechnology, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China
| | - Jingwei Zhou
- College of Biotechnology and Pharmaceutical Engineering, National Engineering Technique Research Center for Biotechnology, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China
| | - Yong Chen
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, No. 5, Xinmofan Road, Nanjing, 210009, China.,College of Biotechnology and Pharmaceutical Engineering, National Engineering Technique Research Center for Biotechnology, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China
| | - Dong Liu
- College of Biotechnology and Pharmaceutical Engineering, National Engineering Technique Research Center for Biotechnology, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China
| | - Hanjie Ying
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, No. 5, Xinmofan Road, Nanjing, 210009, China.,College of Biotechnology and Pharmaceutical Engineering, National Engineering Technique Research Center for Biotechnology, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China.,Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, No. 30, Puzhu South Road, Nanjing, 211816, China
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17
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Bou Zeidan M, Zara G, Viti C, Decorosi F, Mannazzu I, Budroni M, Giovannetti L, Zara S. L-histidine inhibits biofilm formation and FLO11-associated phenotypes in Saccharomyces cerevisiae flor yeasts. PLoS One 2014; 9:e112141. [PMID: 25369456 PMCID: PMC4219837 DOI: 10.1371/journal.pone.0112141] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 09/18/2014] [Indexed: 11/19/2022] Open
Abstract
Flor yeasts of Saccharomyces cerevisiae have an innate diversity of Flo11p which codes for a highly hydrophobic and anionic cell-wall glycoprotein with a fundamental role in biofilm formation. In this study, 380 nitrogen compounds were administered to three S. cerevisiae flor strains handling Flo11p alleles with different expression levels. S. cerevisiae strain S288c was used as the reference strain as it cannot produce Flo11p. The flor strains generally metabolized amino acids and dipeptides as the sole nitrogen source, although with some exceptions regarding L-histidine and histidine containing dipeptides. L-histidine completely inhibited growth and its effect on viability was inversely related to Flo11p expression. Accordingly, L-histidine did not affect the viability of the Δflo11 and S288c strains. Also, L-histidine dramatically decreased air-liquid biofilm formation and adhesion to polystyrene of the flor yeasts with no effect on the transcription level of the Flo11p gene. Moreover, L-histidine modified the chitin and glycans content on the cell-wall of flor yeasts. These findings reveal a novel biological activity of L-histidine in controlling the multicellular behavior of yeasts [corrected].
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Affiliation(s)
- Marc Bou Zeidan
- Dipartimento di Agraria, University of Sassari, Sassari, Italy
| | - Giacomo Zara
- Dipartimento di Agraria, University of Sassari, Sassari, Italy
| | - Carlo Viti
- Dipartimento di Scienze delle Produzioni Agroalimentari e dell'Ambiente, University of Florence, Firenze, Italy
| | - Francesca Decorosi
- Dipartimento di Scienze delle Produzioni Agroalimentari e dell'Ambiente, University of Florence, Firenze, Italy
| | - Ilaria Mannazzu
- Dipartimento di Agraria, University of Sassari, Sassari, Italy
| | | | - Luciana Giovannetti
- Dipartimento di Scienze delle Produzioni Agroalimentari e dell'Ambiente, University of Florence, Firenze, Italy
| | - Severino Zara
- Dipartimento di Agraria, University of Sassari, Sassari, Italy
- * E-mail:
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18
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Alvarez F, Correa LFDM, Araújo TM, Mota BEF, da Conceição LEFR, Castro IDM, Brandão RL. Variable flocculation profiles of yeast strains isolated from cachaça distilleries. Int J Food Microbiol 2014; 190:97-104. [PMID: 25209588 DOI: 10.1016/j.ijfoodmicro.2014.08.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Revised: 08/04/2014] [Accepted: 08/09/2014] [Indexed: 10/24/2022]
Abstract
In cachaça production, the use of yeast cells as starters with predictable flocculation behavior facilitates the cell recovery at the end of each fermentation cycle. Therefore, the aim of this work was to explain the behavior of cachaça yeast strains in fermentation vats containing sugarcane through the determination of biochemical and molecular parameters associated with flocculation phenotypes. By analyzing thirteen cachaça yeast strains isolated from different distilleries, our results demonstrated that neither classic biochemical measurements (e.g., percentage of flocculation, EDTA sensitivity, cell surface hydrophobicity, and sugar residues on the cell wall) nor modern molecular approaches, such as polymerase chain reaction (PCR) and real-time PCR (q-PCR), were sufficient to distinctly classify the cachaça yeast strains according to their flocculation behavior. It seems that flocculation is indeed a strain-specific phenomenon that is difficult to explain and/or categorize by the available methodologies.
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Affiliation(s)
- Florencia Alvarez
- Cerlev - Projetos e Inovação na Biotecnologia da Fermentação Ltda, Rua Amaro Lanari 59, Saramenha, 35.400-000 Ouro Preto, MG, Brazil
| | - Lygia Fátima da Mata Correa
- Laboratório de Biologia Celular e Molecular, Núcleo de Pesquisas em Ciências Biológicas, Universidade Federal de Ouro Preto, Brazil
| | - Thalita Macedo Araújo
- Laboratório de Biologia Celular e Molecular, Núcleo de Pesquisas em Ciências Biológicas, Universidade Federal de Ouro Preto, Brazil
| | - Bruno Eduardo Fernandes Mota
- Laboratório de Biologia Celular e Molecular, Núcleo de Pesquisas em Ciências Biológicas, Universidade Federal de Ouro Preto, Brazil
| | | | - Ieso de Miranda Castro
- Laboratório de Biologia Celular e Molecular, Núcleo de Pesquisas em Ciências Biológicas, Universidade Federal de Ouro Preto, Brazil
| | - Rogelio Lopes Brandão
- Laboratório de Biologia Celular e Molecular, Núcleo de Pesquisas em Ciências Biológicas, Universidade Federal de Ouro Preto, Brazil.
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19
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Stewart GG, Hill AE, Russell I. 125thAnniversary Review: Developments in brewing and distilling yeast strains. JOURNAL OF THE INSTITUTE OF BREWING 2013. [DOI: 10.1002/jib.104] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Graham G. Stewart
- 13 Heol Nant Castan, Rhiwbina Cardiff CF14 6RP UK
- ICBD; Heriot-Watt University; Riccarton Edinburgh EH14 4AS UK
| | - Annie E. Hill
- ICBD; Heriot-Watt University; Riccarton Edinburgh EH14 4AS UK
| | - Inge Russell
- ICBD; Heriot-Watt University; Riccarton Edinburgh EH14 4AS UK
- Alltech Inc.; Nicholasville KY 40356 USA
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20
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Stirke A, Zimkus A, Ramanaviciene A, Balevicius S, Zurauskiene N, Saulis G, Chaustova L, Stankevic V, Ramanavicius A. Electric field-induced effects on yeast cell wall permeabilization. Bioelectromagnetics 2013; 35:136-44. [PMID: 24203648 DOI: 10.1002/bem.21824] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Accepted: 09/19/2013] [Indexed: 11/09/2022]
Abstract
The permeability of the yeast cells (Saccharomyces cerevisiae) to lipophilic tetraphenylphosphonium cations (TPP(+) ) after their treatment with single square-shaped strong electric field pulses was analyzed. Pulsed electric fields (PEF) with durations from 5 to 150 µs and strengths from 0 to 10 kV/cm were applied to a standard electroporation cuvette filled with the appropriate buffer. The TPP(+) absorption process was analyzed using an ion selective microelectrode (ISE) and the plasma membrane permeability was determined by measurements obtained using a calcein blue dye release assay. The viability of the yeast and the inactivation of the cells were determined using the optical absorbance method. The experimental data taken after yeasts were treated with PEF and incubated for 3 min showed an increased uptake of TPP(+) by the yeast. This process can be controlled by setting the amplitude and pulse duration of the applied PEF. The kinetics of the TPP(+) absorption process is described using the second order absolute rate equation. It was concluded that the changes of the charge on the yeast cell wall, which is the main barrier for TPP(+) , is due to the poration of the plasma membrane. The applicability of the TPP(+) absorption measurements for the analysis of yeast cells electroporation process is also discussed.
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Affiliation(s)
- Arunas Stirke
- Center for Physical Sciences and Technology, Vilnius, Lithuania; Center of Nanotechnology and Materials Science-NanoTechnas, Faculty of Chemistry, Vilnius University, Vilnius, Lithuania
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21
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Li E, Yue F, Chang Q, Guo X, He X, Zhang B. Deletion of intragenic tandem repeats in unit C of FLO1 of Saccharomyces cerevisiae increases the conformational stability of flocculin under acidic and alkaline conditions. PLoS One 2013; 8:e53428. [PMID: 23308221 PMCID: PMC3537727 DOI: 10.1371/journal.pone.0053428] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Accepted: 11/27/2012] [Indexed: 11/18/2022] Open
Abstract
Flocculation is an attractive property for Saccaromyces cerevisiae, which plays important roles in fermentation industry and environmental remediation. The process of flocculation is mediated by a family of cell surface flocculins. As one member of flocculins, Flo1 is characterized by four families of repeats (designated as repeat units A, B, C and D) in the central domain. It is generally accepted that variation of repeat unit A in length in Flo1 influences the degree of flocculation or specificity for sugar recognization. However, no reports were observed for other repeat units. Here, we compared the flocculation ability and its sensitivity to environmental factors between yeast strain YSF1 carrying the intact FLO1 gene and yeast strains carrying the derived forms of FLO1 with partial or complete deletion of repeats in unit C. No obvious differences in flocculation ability and specificity of carbohydrate recognition were observed among these yeast strains, which indicates the truncated flocculins can stride across the cell wall and cluster the N-terminal domain on the surface of yeast cells as the intact Flo1 thereby improving intercellular binding. However, yeast strains with the truncated flocculins required more mannose to inhibit completely the flocculation, displayed broad tolerance of flocculation to pH fluctuation, and the fewer the repeats in unit C, the stronger adaptability of flocculation to pH change, which was not relevant to the position of deletion. This suggests that more stable active conformation is obtained for flocculin by deletion the repeat unit C in the central domain of Flo1, which was validated further by the higher hydrophobicity on the surface of cells of YSF1c with complete deletion of unit C under neutral and alkaline conditions and the stabilization of GFP conformation by fusion with flocculin with complete deletion of unit C in the central domain.
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Affiliation(s)
- Ee Li
- Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Feng Yue
- Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Qi Chang
- Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xuena Guo
- Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Xiuping He
- Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- * E-mail:
| | - Borun Zhang
- Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
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22
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Novel permittivity test for determination of yeast surface charge and flocculation abilities. J Ind Microbiol Biotechnol 2012; 39:1881-6. [PMID: 22976039 PMCID: PMC3501174 DOI: 10.1007/s10295-012-1193-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 08/22/2012] [Indexed: 11/16/2022]
Abstract
Yeast flocculation has been found to be important in many biotechnological processes. It has been suggested that flocculation is promoted by decreasing electrostatic repulsion between cells. In this study, we used an unconventional rapid technique—permittivity test—for determination of the flocculation properties and surface charge values of three industrial yeast strains with well-known flocculation characteristics: Saccharomyces cerevisiae NCYC 1017 (brewery, ale), S. pastorianus NCYC 680 (brewery, lager), and Debaryomyces occidentalis LOCK 0251 (unconventional amylolytic yeast). The measurements of permittivity were compared with the results from two classical methods for determination of surface charge: Alcian blue retention and Sephadex DEAE attachment. The permittivity values for particular strains correlated directly with the results of Alcian blue retention (r = 0.9). The results also confirmed a strong negative relationship between the capacitance of yeast suspensions and their flocculation abilities. The highest permittivity was noted for the ale strain NCYC 1017, with weak flocculation abilities, and the lowest for the flocculating lager yeast NCYC 680. This paper is the first to describe the possibility of using a rapid permittivity test to evaluate the surface charge of yeast cells and their flocculation abilities. This method is of practical value in various biotechnological industries where flocculation is applied as a major method of cell separation.
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23
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Posttranscriptional regulation of cell-cell interaction protein-encoding transcripts by Zfs1p in Schizosaccharomyces pombe. Mol Cell Biol 2012; 32:4206-14. [PMID: 22907753 DOI: 10.1128/mcb.00325-12] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Members of the tristetraprolin (TTP) family of CCCH tandem zinc finger proteins can bind directly to AU-rich elements in mRNAs and promote transcript deadenylation and decay. The yeast Schizosaccharomyces pombe expresses a single TTP family member, Zfs1p. In this study, we identified probable Zfs1p target mRNAs by comparing transcript levels in wild-type yeast and zfs1Δ mutants, using deep sequencing and microarray approaches. We also used direct RNA sequencing to determine polyadenylation site locations and to confirm the presence of potential Zfs1p target sequences within the target mRNA. These studies identified a set of transcripts containing potential Zfs1p binding sites that accumulated significantly in the zfs1Δ mutants; a subset of these transcripts decayed more slowly in the zfs1Δ mutants and bound directly to Zfs1p in coimmunoprecipitation assays. One apparent direct target encodes the transcription factor Cbf12p, which is known to increase cell-cell adhesion and flocculation when overexpressed. Studies of zfs1Δ cbf12Δ double mutants demonstrated that the increased flocculation seen in zfs1Δ mutants is due, at least in part, to a direct effect on the turnover of cbf12 mRNA. These data suggest that Zfs1p can both directly and indirectly regulate the levels of transcripts involved in cell-cell adhesion in this species.
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