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Liang S, Zhang T, Liu Z, Wang J, Zhu C, Kong Q, Fu X, Mou H. Response mechanism of Vibrio parahaemolyticus at high pressure revealed by transcriptomic analysis. Appl Microbiol Biotechnol 2022; 106:5615-5628. [DOI: 10.1007/s00253-022-12082-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 07/10/2022] [Accepted: 07/13/2022] [Indexed: 11/02/2022]
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2
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Okur I, Sezer P, Oztop MH, Alpas H. Recent advances in gelatinisation and retrogradation of starch by high hydrostatic pressure. Int J Food Sci Technol 2021. [DOI: 10.1111/ijfs.15174] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ilhami Okur
- Department of Food Engineering Middle East Technical University Ankara 06800 Turkey
- Department of Food Engineering Niğde Ömer Halisdemir University Niğde 51240 Turkey
| | - Purlen Sezer
- Department of Food Engineering Middle East Technical University Ankara 06800 Turkey
| | - Mecit Halil Oztop
- Department of Food Engineering Middle East Technical University Ankara 06800 Turkey
| | - Hami Alpas
- Department of Food Engineering Middle East Technical University Ankara 06800 Turkey
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3
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Peng K, Koubaa M, Bals O, Vorobiev E. Recent insights in the impact of emerging technologies on lactic acid bacteria: A review. Food Res Int 2020; 137:109544. [DOI: 10.1016/j.foodres.2020.109544] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/08/2020] [Accepted: 07/09/2020] [Indexed: 12/14/2022]
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4
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Okur I, Ozel B, Oztop MH, Alpas H. Effect of high hydrostatic pressure in physicochemical properties and in vitro digestibility of cornstarch by nuclear magnetic resonance relaxometry. J FOOD PROCESS ENG 2019. [DOI: 10.1111/jfpe.13168] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Ilhami Okur
- Department of Food EngineeringMiddle East Technical University Ankara Turkey
- Department of Food EngineeringNiğde Ömer Halisdemir University Nigde Turkey
| | - Baris Ozel
- Department of Food EngineeringMiddle East Technical University Ankara Turkey
- Food Engineering DepartmentAhi Evran University Kirsehir Turkey
| | - Mecit H. Oztop
- Department of Food EngineeringMiddle East Technical University Ankara Turkey
| | - Hami Alpas
- Department of Food EngineeringMiddle East Technical University Ankara Turkey
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5
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Phase transitions during high pressure treatment of frozen carrot juice and influence on Escherichia coli inactivation. Lebensm Wiss Technol 2017. [DOI: 10.1016/j.lwt.2017.01.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Misra NN, Koubaa M, Roohinejad S, Juliano P, Alpas H, Inácio RS, Saraiva JA, Barba FJ. Landmarks in the historical development of twenty first century food processing technologies. Food Res Int 2017; 97:318-339. [PMID: 28578057 DOI: 10.1016/j.foodres.2017.05.001] [Citation(s) in RCA: 142] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 05/01/2017] [Accepted: 05/03/2017] [Indexed: 12/11/2022]
Abstract
Over a course of centuries, various food processing technologies have been explored and implemented to provide safe, fresher-tasting and nutritive food products. Among these technologies, application of emerging food processes (e.g., cold plasma, pressurized fluids, pulsed electric fields, ohmic heating, radiofrequency electric fields, ultrasonics and megasonics, high hydrostatic pressure, high pressure homogenization, hyperbaric storage, and negative pressure cavitation extraction) have attracted much attention in the past decades. This is because, compared to their conventional counterparts, novel food processes allow a significant reduction in the overall processing times with savings in energy consumption, while ensuring food safety, and ample benefits for the industry. Noteworthily, industry and university teams have made extensive efforts for the development of novel technologies, with sound scientific knowledge of their effects on different food materials. The main objective of this review is to provide a historical account of the extensive efforts and inventions in the field of emerging food processing technologies since their inception to present day.
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Affiliation(s)
- N N Misra
- GTECH, Research & Development, General Mills India Private Limited, Mumbai, India
| | - Mohamed Koubaa
- Sorbonne Universités, Université de Technologie de Compiègne, Laboratoire Transformations Intégrées de la Matière Renouvelable (UTC/ESCOM, EA 4297 TIMR), Centre de Recherche de Royallieu, CS 60319, 60203 Compiègne Cedex, France
| | - Shahin Roohinejad
- Department of Food Technology and Bioprocess Engineering, Max Rubner-Institut, Federal Research Institute of Nutrition and Food, Haid-und-Neu-Str. 9, Karlsruhe 76131, Germany; Burn and Wound Healing Research Center, Division of Food and Nutrition, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Pablo Juliano
- CSIRO Agriculture and Food, 671 Sneydes Road, Werribee, VIC, Australia
| | - Hami Alpas
- Department of Food Engineering, Middle East Technical University (METU), Ankara 06800, Turkey
| | - Rita S Inácio
- Department of Chemistry, Research Unit of Química Orgânica, Produtos Naturais e Agroalimentares (QOPNA), University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Jorge A Saraiva
- Department of Chemistry, Research Unit of Química Orgânica, Produtos Naturais e Agroalimentares (QOPNA), University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Francisco J Barba
- Nutrition and Food Science Area, Preventive Medicine and Public Health, Food Science, Toxicology and Forensic Medicine Department, Faculty of Pharmacy, Universitat de València, Avda, Vicent Andrés Estellés, s/n 46100 Burjassot, València, Spain.
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7
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Impact of high hydrostatic pressure on bacterial proteostasis. Biophys Chem 2017; 231:3-9. [PMID: 28365058 DOI: 10.1016/j.bpc.2017.03.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Accepted: 03/20/2017] [Indexed: 02/01/2023]
Abstract
High hydrostatic pressure (HHP) is an important factor that limits microbial growth in deep-sea ecosystems to specifically adapted piezophiles. Furthermore, HHP treatment is used as a novel food preservation technique because of its ability to inactivate pathogenic and spoilage bacteria while minimizing the loss of food quality. Disruption of protein homeostasis (i.e. proteostasis) as a result of HHP-induced conformational changes in ribosomes and proteins has been considered as one of the limiting factors for both microbial growth and survival under HHP conditions. This work therefore reviews the effects of sublethal (≤100MPa) and lethal (>100MPa) pressures on protein synthesis, structure, and functionality in bacteria. Furthermore, current understanding on the mechanisms adopted by piezophiles to maintain proteostasis in HHP environments and responses developed by atmospheric-adapted bacteria to protect or restore proteostasis after HHP exposure are discussed.
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Gurbanov R, Yıldız F. MOLECULAR PROFILE OF ORAL PROBIOTIC BACTERIA TO BE USED WITH FUNCTIONAL FOODS. ACTA ACUST UNITED AC 2017. [DOI: 10.3153/jfhs17015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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10
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Bock I, Raveh-Amit H, Losonczi E, Carstea AC, Feher A, Mashayekhi K, Matyas S, Dinnyes A, Pribenszky C. Controlled hydrostatic pressure stress downregulates the expression of ribosomal genes in preimplantation embryos: a possible protection mechanism? Reprod Fertil Dev 2016; 28:776-84. [DOI: 10.1071/rd14346] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 09/25/2014] [Indexed: 12/18/2022] Open
Abstract
The efficiency of various assisted reproductive techniques can be improved by preconditioning the gametes and embryos with sublethal hydrostatic pressure treatment. However, the underlying molecular mechanism responsible for this protective effect remains unknown and requires further investigation. Here, we studied the effect of optimised hydrostatic pressure treatment on the global gene expression of mouse oocytes after embryonic genome activation. Based on a gene expression microarray analysis, a significant effect of treatment was observed in 4-cell embryos derived from treated oocytes, revealing a transcriptional footprint of hydrostatic pressure-affected genes. Functional analysis identified numerous genes involved in protein synthesis that were downregulated in 4-cell embryos in response to hydrostatic pressure treatment, suggesting that regulation of translation has a major role in optimised hydrostatic pressure-induced stress tolerance. We present a comprehensive microarray analysis and further delineate a potential mechanism responsible for the protective effect of hydrostatic pressure treatment.
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Brannan AM, Whelan WA, Cole E, Booth V. Differential scanning calorimetry of whole Escherichia coli treated with the antimicrobial peptide MSI-78 indicate a multi-hit mechanism with ribosomes as a novel target. PeerJ 2015; 3:e1516. [PMID: 26713257 PMCID: PMC4690349 DOI: 10.7717/peerj.1516] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 11/27/2015] [Indexed: 11/20/2022] Open
Abstract
Differential Scanning Calorimetry (DSC) of intact Escherichia coli (E. coli) was used to identify non-lipidic targets of the antimicrobial peptide (AMP) MSI-78. The DSC thermograms revealed that, in addition to its known lytic properties, MSI-78 also has a striking effect on ribosomes. MSI-78’s effect on DSC scans of bacteria was similar to that of kanamycin, an antibiotic drug known to target the 30S small ribosomal subunit. An in vitro transcription/translation assay helped confirm MSI-78’s targeting of ribosomes. The scrambled version of MSI-78 also affected the ribosome peak of the DSC scans, but required greater amounts of peptide to cause a similar effect to the unscrambled peptide. Furthermore, the effect of the scrambled peptide was not specific to the ribosomes; other regions of the DSC thermogram were also affected. These results suggest that MSI-78’s effects on E. coli are at least somewhat dependent on its particular structural features, rather than a sole function of its overall charge and hydrophobicity. When considered along with earlier work detailing MSI-78’s membrane lytic properties, it appears that MSI-78 operates via a multi-hit mechanism with multiple targets.
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Affiliation(s)
- Alexander M Brannan
- Department of Biochemistry, Memorial University of Newfoundland , St. John's Newfoundland and Labrador , Canada
| | - William A Whelan
- Department of Biochemistry, Memorial University of Newfoundland , St. John's Newfoundland and Labrador , Canada
| | - Emma Cole
- Department of Biochemistry, Memorial University of Newfoundland , St. John's Newfoundland and Labrador , Canada
| | - Valerie Booth
- Department of Biochemistry, Memorial University of Newfoundland , St. John's Newfoundland and Labrador , Canada ; Department of Physics and Physical Oceanography, Memorial University of Newfoundland , St. John's Newfoundland and Labrador , Canada
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12
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Marietou A, Nguyen ATT, Allen EE, Bartlett DH. Adaptive laboratory evolution of Escherichia coli K-12 MG1655 for growth at high hydrostatic pressure. Front Microbiol 2015; 5:749. [PMID: 25610434 PMCID: PMC4285802 DOI: 10.3389/fmicb.2014.00749] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2014] [Accepted: 12/10/2014] [Indexed: 12/03/2022] Open
Abstract
Much of microbial life on Earth grows and reproduces under the elevated hydrostatic pressure conditions that exist in deep-ocean and deep-subsurface environments. In this study adaptive laboratory evolution (ALE) experiments were conducted to investigate the possible modification of the piezosensitive Escherichia coli for improved growth at high pressure. After approximately 500 generations of selection, a strain was isolated that acquired the ability to grow at pressure non-permissive for the parental strain. Remarkably, this strain displayed growth properties and changes in the proportion and regulation of unsaturated fatty acids that indicated the acquisition of multiple piezotolerant properties. These changes developed concomitantly with a change in the gene encoding the acyl carrier protein, which is required for fatty acid synthesis.
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Affiliation(s)
- Angeliki Marietou
- Marine Biology Research Division, Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
| | - Alice T T Nguyen
- Marine Biology Research Division, Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
| | - Eric E Allen
- Marine Biology Research Division, Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
| | - Douglas H Bartlett
- Marine Biology Research Division, Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
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13
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Huang HW, Lung HM, Yang BB, Wang CY. Responses of microorganisms to high hydrostatic pressure processing. Food Control 2014. [DOI: 10.1016/j.foodcont.2013.12.007] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Le Bihan T, Rayner J, Roy MM, Spagnolo L. Photobacterium profundum under pressure: a MS-based label-free quantitative proteomics study. PLoS One 2013; 8:e60897. [PMID: 23741291 PMCID: PMC3669370 DOI: 10.1371/journal.pone.0060897] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Accepted: 03/04/2013] [Indexed: 11/19/2022] Open
Abstract
Photobacterium profundum SS9 is a Gram-negative bacterium, originally collected from the Sulu Sea. Its genome consists of two chromosomes and a 80 kb plasmid. Although it can grow under a wide range of pressures, P. profundum grows optimally at 28 MPa and 15°C. Its ability to grow at atmospheric pressure allows for both easy genetic manipulation and culture, making it a model organism to study piezophily. Here, we report a shotgun proteomic analysis of P. profundum grown at atmospheric compared to high pressure using label-free quantitation and mass spectrometry analysis. We have identified differentially expressed proteins involved in high pressure adaptation, which have been previously reported using other methods. Proteins involved in key metabolic pathways were also identified as being differentially expressed. Proteins involved in the glycolysis/gluconeogenesis pathway were up-regulated at high pressure. Conversely, several proteins involved in the oxidative phosphorylation pathway were up-regulated at atmospheric pressure. Some of the proteins that were differentially identified are regulated directly in response to the physical impact of pressure. The expression of some proteins involved in nutrient transport or assimilation, are likely to be directly regulated by pressure. In a natural environment, different hydrostatic pressures represent distinct ecosystems with their own particular nutrient limitations and abundances. However, the only variable considered in this study was atmospheric pressure.
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Affiliation(s)
- Thierry Le Bihan
- SynthSys, The University of Edinburgh, Edinburgh, United Kingdom
- Institute of Structural and Molecular Biology, University of Edinburgh, Edinburgh, United Kingdom
- * E-mail: (TLB); (LS)
| | - Joe Rayner
- SynthSys, The University of Edinburgh, Edinburgh, United Kingdom
- Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh, United Kingdom
| | - Marcia M. Roy
- Wellcome Trust Centre for Cell Biology, School of Biological Sciences, University of Edinburgh, Edinburgh, United Kingdom
| | - Laura Spagnolo
- Institute of Structural and Molecular Biology, University of Edinburgh, Edinburgh, United Kingdom
- Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh, United Kingdom
- * E-mail: (TLB); (LS)
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Yang B, Shi Y, Xia X, Xi M, Wang X, Ji B, Meng J. Inactivation of foodborne pathogens in raw milk using high hydrostatic pressure. Food Control 2012. [DOI: 10.1016/j.foodcont.2012.04.030] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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Bermúdez-Aguirre D, Guerrero-Beltrán JÁ, Barbosa-Cánovas G, Welti-Chanes J. Study of the inactivation of Escherichia coli and pectin methylesterase in mango nectar under selected high hydrostatic pressure treatments. FOOD SCI TECHNOL INT 2011; 17:541-7. [DOI: 10.1177/1082013211399681] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
High hydrostatic pressure (HHP) was applied to fresh mango nectar (FMN) and sterilized mango nectar (SMN) to inactivate Escherichia coli and pectin methylesterase (PME). Pressure was applied at 275, 345 and 414 MPa. The come-up time (CUT) as well as 1, 2 and 4 min of treatment times were applied at the selected pressure to evaluate the inactivation effect on E. coli and PME. Total plate counts (TPC) were also evaluated in FMN. Results showed that mesophiles are inactivated in FMN to an important degree (up to 4 log) only with the CUT; the highest inactivation for mesophiles (7 log) was reported at 414 MPa after 4 min. Meanwhile, for E. coli 345 and 414 MPa after 2 and 1 min, respectively, were able to inactivate all viable cells in FMN. However, in SMN after 4 min at 275 MPa all cells of E. coli were also inactivated, showing the protective effect of the media between FMN and SMN. The PME showed its resistance to be inactivated with high pressure, showing the highest decrease in enzymatic activity (45%) after 4 min at 345 MPa but with an important activation at the highest pressure (414 MPa).
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Affiliation(s)
- D. Bermúdez-Aguirre
- Center for Nonthermal Processing of Food, Washington State University, Pullman, WA 99164, USA
| | - J. Ángel Guerrero-Beltrán
- Departamento de Ingeniería Química, Alimentos y Ambiental, Universidad de las Américas Puebla, Santa Catarina Mártir, Cholula, Puebla 72820, México
| | - G.V. Barbosa-Cánovas
- Center for Nonthermal Processing of Food, Washington State University, Pullman, WA 99164, USA
| | - J. Welti-Chanes
- Escuela de Biotecnología y Alimentos, Instituto Tecnológico de Estudios Superiores de Monterrey, Monterrey, NL 64849, México
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17
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Nguyen Thi Minh H, Dantigny P, Perrier-Cornet JM, Gervais P. Germination and inactivation of Bacillus subtilis spores induced by moderate hydrostatic pressure. Biotechnol Bioeng 2010; 107:876-83. [DOI: 10.1002/bit.22849] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Inactivation of Salmonella Enteritidis strains by combination of high hydrostatic pressure and nisin. Int J Food Microbiol 2010; 140:49-56. [PMID: 20226554 DOI: 10.1016/j.ijfoodmicro.2010.02.010] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2009] [Revised: 02/08/2010] [Accepted: 02/10/2010] [Indexed: 11/24/2022]
Abstract
The effects of high hydrostatic pressure (HHP) and nisin treatment alone and in combination on cellular components and viability of two Salmonella enterica subsp. enterica serovar Enteritidis (S. Enteritidis) strains were evaluated by differential scanning calorimetry (DSC) and plate counting in order to evaluate the relative resistance and optimize the treatment conditions. S. Enteritidis FDA and OSU 799 strains were subjected to HHP (0.1-550 MPa for 10 min at 25 degrees C) alone and in combination with nisin (200 IU/ml nisin) in culture broth. HHP (up to 200 MPa) or the nisin alone did not affect the viability and cellular components of either strain. An 8-log cfu/ml reduction was observed after a pressure treatment at 500 MPa for the FDA strain and 450 MPa for the OSU 799 strain. When nisin was added, a similar reduction was obtained at 400 MPa for FDA strain and 350 MPa for the OSU 799 strain. The decrease in apparent enthalpy appeared to be mainly due to reduction in the ribosome denaturation peak for both the pressure alone and the pressure-nisin combination treatments. HHP facilitated penetration of nisin into the cell above 100 MPa pressure. Monitoring through DNA-binding probes the effect of pressure and nisin treatments on DNA in vivo showed that nisin did not affect DNA at 200 IU/ml. The apparent enthalpy data obtained from DSC can be used for optimization of pressure levels to reduce a microbial population in the presence of nisin.
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Pilavtepe-Çelik M, Buzrul S, Alpas H, Bozoğlu F. Development of a new mathematical model for inactivation of Escherichia coli O157:H7 and Staphylococcus aureus by high hydrostatic pressure in carrot juice and peptone water. J FOOD ENG 2009. [DOI: 10.1016/j.jfoodeng.2008.06.043] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Tassou C, Panagou E, Samaras F, Galiatsatou P, Mallidis C. Temperature-assisted high hydrostatic pressure inactivation of Staphylococcus aureus in a ham model system: evaluation in selective and nonselective medium. J Appl Microbiol 2008; 104:1764-73. [DOI: 10.1111/j.1365-2672.2007.03698.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Lauro FM, Bartlett DH. Prokaryotic lifestyles in deep sea habitats. Extremophiles 2007; 12:15-25. [PMID: 17225926 DOI: 10.1007/s00792-006-0059-5] [Citation(s) in RCA: 116] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2006] [Accepted: 12/10/2006] [Indexed: 11/25/2022]
Abstract
Gradients of physicochemical factors influence the growth and survival of life in deep-sea environments. Insights into the characteristics of deep marine prokaryotes has greatly benefited from recent progress in whole genome and metagenome sequence analyses. Here we review the current state-of-the-art of deep-sea microbial genomics. Ongoing and future genome-enabled studies will allow for a better understanding of deep-sea evolution, physiology, biochemistry, community structure and nutrient cycling.
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Affiliation(s)
- Federico M Lauro
- Scripps Institution of Oceanography, Center for Marine Biotechnology and Biomedicine, Marine Biology Research Division, University of California, 8750 Biological Grade, San Diego, La Jolla, CA 92093-0202, USA
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Simonato F, Campanaro S, Lauro FM, Vezzi A, D'Angelo M, Vitulo N, Valle G, Bartlett DH. Piezophilic adaptation: a genomic point of view. J Biotechnol 2006; 126:11-25. [PMID: 16780980 DOI: 10.1016/j.jbiotec.2006.03.038] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2005] [Revised: 02/09/2006] [Accepted: 03/29/2006] [Indexed: 10/24/2022]
Abstract
Two-thirds of Earth's surface is covered by oceans, yet the study of this massive integrated living system is still in its infancy. Various environmental variables, such as high salinity, low and changeable nutrient availability and depth-correlated gradients of light, temperature, nutrients and pressure shape the diversity, physiology and ecology of marine species. As oceans present an average depth of 3800 m, deep-sea ecosystems represent the most common marine ecological niche. One of the key environment variables that influences the life and evolution of deep-sea organisms is high pressure. This extreme widespread condition requires specific adaptations, the nature of which remains largely unknown. Recent advances in genomic approaches, such as in sequencing technologies and global expression profiling, are rapidly increasing the data available to understand microbial evolution, biochemistry, physiology and diversity. This review summarises the analysis of the results published so far about microbial high pressure adaptation from a genomic point of view. Understanding high pressure adaptation mechanisms is not just a scientific exercise but has important biotechnological implications. For example, hydrostatic pressure is a reality for food science and technology, both for food preparation and preservation. An understanding of the effects of pressure on biomolecules will expand its use in the medical, industrial and biotechnological fields.
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Affiliation(s)
- Francesca Simonato
- Department of Biology, Università di Padova, via Ugo Bassi 58/B, 35131 Padova, Italy.
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Avsaroglu MD, Buzrul S, Alpas H, Akcelik M, Bozoglu F. Use of the Weibull model for lactococcal bacteriophage inactivation by high hydrostatic pressure. Int J Food Microbiol 2006; 108:78-83. [PMID: 16387378 DOI: 10.1016/j.ijfoodmicro.2005.10.027] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2005] [Revised: 09/28/2005] [Accepted: 10/12/2005] [Indexed: 10/25/2022]
Abstract
Four lactococcal bacteriophages (phiLl6-2, phiLl35-6, phiLd66-36 and phiLd67-42) in M17 broth were pressurized at 300 and 350 MPa at room temperature and their survival curves were determined at various time intervals. Tailing (monotonic upward concavity) was observed in all survival curves. The resulting non-linear semi-logarithmic survival curves were described by the Weibull model and goodness of fit of this model was investigated. Regression coefficients (R2), root mean square error (RMSE), residual and correlation plots strongly suggested that Weibull model produced a better fit to the data than the traditional linear model. Hazard plots suggested that the Weibull model was fully appropriate for the data being analyzed. These results have confirmed that the Weibull model, which is mostly utilized to describe the inactivation of bacterial cells or spores by heat and pressure, could be successfully used in describing the lactococcal bacteriophage inactivation by high hydrostatic pressure.
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Affiliation(s)
- M Dilek Avsaroglu
- Food Engineering Department, Middle East Technical University, 06531 Ankara, Turkey
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24
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Lee J, Kaletunç G. Evaluation by differential scanning calorimetry of the effect of acid, ethanol, and NaCl on Escherichia coli. J Food Prot 2005; 68:487-93. [PMID: 15771171 DOI: 10.4315/0362-028x-68.3.487] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The influence of acid, ethanol, and NaCl on the cellular components and inactivation of Escherichia coli were evaluated using differential scanning calorimetry. Cell viability was assessed using plate counting. The thermal stability for ribosomal subunit denaturation and the total apparent enthalpy decreased with increasing ethanol, salt, and acid concentrations. The reduction of the ribosomal subunit denaturation peak was the primary contributor to the decrease in the total apparent enthalpy. Thermograms indicated that even at concentrations at which less than a 0.4-log reduction of cell viability with a concomitant minimal reduction of total apparent enthalpy occurred, a decrease in onset temperature of ribosomal transition was evident. Acid treatments at pH 3 induced by HCl and by 0.4 M acetic acid caused the DNA denaturation temperature in vivo to decrease. Application of chemical treatment prior to heat treatment noticeably reduced the viability of E. coli cells at all the heat treatment temperatures (60, 62.5, and 65 degrees C) compared with that of heat treatment alone, suggesting an increased sensitivity of bacteria to heat treatment. Differential scanning calorimetry in vivo can be used to assess the effectiveness of hurdles when thermal processing technologies with hurdles are designed.
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Affiliation(s)
- Jaesung Lee
- Department of Food, Agricultural, and Biological Engineering, Ohio State University, Columbus, Ohio 43210, USA
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Bozoglu F, Alpas H, Kaletunç G. Injury recovery of foodborne pathogens in high hydrostatic pressure treated milk during storage. ACTA ACUST UNITED AC 2004; 40:243-7. [PMID: 15039101 DOI: 10.1016/s0928-8244(04)00002-1] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2003] [Revised: 12/16/2003] [Accepted: 12/24/2003] [Indexed: 11/19/2022]
Abstract
Bacteria are expected to be injured or killed by high hydrostatic pressure (HHP). This depends on pressure levels, species and strain of the microorganism and subsequent storage. Injured bacteria may be repaired which could affect the microbiological quality of foodstuffs with an important safety consideration especially in low acid food products. In this study two Gram-positive (Listeria monocytogenes CA and Staphylococcus aureus 485) and two Gram-negative (Escherichia coli O157:H7 933 and Salmonella enteritidis FDA) relatively pressure resistant strains of foodborne pathogens were pressurized at 350, 450 and 550 MPa in milk (pH 6.65) and stored at 4, 22 and 30 degrees C. The results of shelf life studies indicated two types of injury, I1 and I2, for all the pathogens studied. It is obvious that I2 type injury is a major injury and after its repair (I2 to I1), the cells can form colonies on non-selective but not on selective agar. The formation of colonies on both selective and non-selective agar occurs only after full recovery of injury (I1 to AC). The results presented in this study show that even if injured cells are not detected immediately after HHP treatment, I2 type injury could be potentially present in the food system. Therefore, it is imperative that shelf life studies must be conducted over a period of time for potential repair of I2 type injury either to detectable injury (I1) or to active cells (AC) to ascertain microbiological safety of low acid food products.
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Affiliation(s)
- Faruk Bozoglu
- Food Engineering Department, Middle East Technical University, Ankara 06531, Turkey
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Kaletunç G, Lee J, Alpas H, Bozoglu F. Evaluation of structural changes induced by high hydrostatic pressure in Leuconostoc mesenteroides. Appl Environ Microbiol 2004; 70:1116-22. [PMID: 14766595 PMCID: PMC348889 DOI: 10.1128/aem.70.2.1116-1122.2004] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2003] [Accepted: 11/07/2003] [Indexed: 11/20/2022] Open
Abstract
Scanning electron microcopy (SEM), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC) were used to evaluate structural changes in Leuconostoc mesenteroides cells as a function of high-hydrostatic-pressure treatment. This bacterium usually grows in chains of cells, which were increasingly dechained at elevated pressures. High-pressure treatments at 250 and 500 MPa also caused changes in the external surface and internal structure of cells. Dechaining and blister formation on the surface of cells increased with pressure, as observed in SEM micrographs. TEM studies showed that cytoplasmic components of the cells were affected by high-pressure treatment. DSC studies of whole cells showed increasing denaturation of ribosomes with pressure, in keeping with dense compacted regions in the cytoplasm of pressure-treated cells observed in TEM micrographs. Apparent reduction of intact ribosomes observed in DSC thermograms was related to the reduction in number of viable cells. The results indicate that inactivation of L. mesenteroides cells is mainly due to ribosomal denaturation observed as a reduction of the corresponding peak in DSC thermograms and condensed interior regions of cytoplasm in TEM micrographs.
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Affiliation(s)
- Gönül Kaletunç
- Department of Food, Agricultural and Biological Engineering, Ohio State University, Columbus, Ohio 43210, USA.
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