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Certain, but Not All, Tetraether Lipids from the Thermoacidophilic Archaeon Sulfolobus acidocaldarius Can Form Black Lipid Membranes with Remarkable Stability and Exhibiting Mthk Channel Activity with Unusually High Ca 2+ Sensitivity. Int J Mol Sci 2021; 22:ijms222312941. [PMID: 34884746 PMCID: PMC8657495 DOI: 10.3390/ijms222312941] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Revised: 11/25/2021] [Accepted: 11/27/2021] [Indexed: 11/19/2022] Open
Abstract
Bipolar tetraether lipids (BTL) have been long thought to play a critical role in allowing thermoacidophiles to thrive under extreme conditions. In the present study, we demonstrated that not all BTLs from the thermoacidophilic archaeon Sulfolobus acidocaldarius exhibit the same membrane behaviors. We found that free-standing planar membranes (i.e., black lipid membranes, BLM) made of the polar lipid fraction E (PLFE) isolated from S. acidocaldarius formed over a pinhole on a cellulose acetate partition in a dual-chamber Teflon device exhibited remarkable stability showing a virtually constant capacitance (~28 pF) for at least 11 days. PLFE contains exclusively tetraethers. The dominating hydrophobic core of PLFE lipids is glycerol dialky calditol tetraether (GDNT, ~90%), whereas glycerol dialkyl glycerol tetraether (GDGT) is a minor component (~10%). In sharp contrast, BLM made of BTL extracted from microvesicles (Sa-MVs) released from the same cells exhibited a capacitance between 36 and 39 pF lasting for only 8 h before membrane dielectric breakdown. Lipids in Sa-MVs are also exclusively tetraethers; however, the dominating lipid species in Sa-MVs is GDGT (>99%), not GDNT. The remarkable stability of BLMPLFE can be attributed to strong PLFE–PLFE and PLFE–substrate interactions. In addition, we compare voltage-dependent channel activity of calcium-gated potassium channels (MthK) in BLMPLFE to values recorded in BLMSa-MV. MthK is an ion channel isolated from a methanogenic that has been extensively characterized in diester lipid membranes and has been used as a model for calcium-gated potassium channels. We found that MthK can insert into BLMPLFE and exhibit channel activity, but not in BLMSa-MV. Additionally, the opening/closing of the MthK in BLMPLFE is detectable at calcium concentrations as low as 0.1 mM; conversely, in diester lipid membranes at such a low calcium concentration, no MthK channel activity is detectable. The differential effect of membrane stability and MthK channel activity between BLMPLFE and BLMSa-MV may be attributed to their lipid structural differences and thus their abilities to interact with the substrate and membrane protein. Since Sa-MVs that bud off from the plasma membrane are exclusively tetraether lipids but do not contain the main tetraether lipid component GDNT of the plasma membrane, domain segregation must occur in S. acidocaldarius. The implication of this study is that lipid domain formation is existent and functionally essential in all kinds of cells, but domain formation may be even more prevalent and pronounced in hyperthermophiles, as strong domain formation with distinct membrane behaviors is necessary to counteract randomization due to high growth temperatures while BTL in general make archaea cell membranes stable in high temperature and low pH environments whereas different BTL domains play different functional roles.
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Ge J, Huang M, Zhou Y, Liu C, Han C, Gao Q, Dong Y, Dong S. Effects of different temperatures on seawater acclimation in rainbow trout Oncorhynchus mykiss: osmoregulation and branchial phospholipid fatty acid composition. J Comp Physiol B 2021; 191:669-679. [PMID: 33818627 DOI: 10.1007/s00360-021-01363-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 02/11/2021] [Accepted: 03/16/2021] [Indexed: 10/21/2022]
Abstract
This study aimed to investigate the effects of different temperatures on seawater acclimation in rainbow trout (Oncorhynchus mykiss), in terms of growth performance, osmoregulatory capacity, and branchial phospholipid fatty acid (PLFA) composition. The fish (initial weight, 94.73 g) were reared at 9, 12.5, and 16 °C for 28 days, then acclimated to seawater, and subsequently reared for 14 days. Sampling points were on the last day in freshwater, and the 1st, 4th, 7th, and 14th days after the salinity reached 30. The results showed the final weight, percent weight gain, and specific growth rate of rainbow trout at 12.5 °C were significantly higher than those at 9 °C, while the thermal growth coefficient at 16 °C was significantly lower than that in other treatments. The branchial PLFA composition in rainbow trout changed more rapidly at 9 and 12.5 °C than at 16 °C. The branchial PLFA composition was significantly affected by temperature and salinity and their interaction. The polyunsaturated fatty acid content of phospholipids in the gill at 9 and 12.5 °C was significantly higher than those at 16 °C. Low temperature (9 °C) and seawater acclimation significantly increased the degree of unsaturation of membrane, enhancing membrane fluidity, which is related to Na+-K+ ATPase activity. Responses of plasma ion, Na+-K+ ATPase activity, and plasma glucose followed a similar pattern at different temperatures. Overall, the study suggests that 12.5 °C is the ideal temperature for seawater acclimation in rainbow trout.
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Affiliation(s)
- Jian Ge
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong, China
| | - Ming Huang
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong, China
| | - Yangen Zhou
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong, China. .,Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, Shandong, China.
| | - Chengyue Liu
- Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, Guangdong, China
| | - Cui Han
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong, China
| | - Qinfeng Gao
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong, China.,Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, Shandong, China
| | - Yunwei Dong
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong, China.,Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, Shandong, China
| | - Shuanglin Dong
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong, China.,Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, Shandong, China
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3
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Ge J, Huang M, Zhou Y, Deng Q, Liu R, Gao Q, Dong Y, Dong S. Effects of seawater acclimation at constant and diel cyclic temperatures on growth, osmoregulation and branchial phospholipid fatty acid composition in rainbow trout Oncorhynchus mykiss. J Comp Physiol B 2021; 191:313-325. [PMID: 33575866 DOI: 10.1007/s00360-020-01330-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 10/08/2020] [Accepted: 11/18/2020] [Indexed: 11/28/2022]
Abstract
The study investigated the effects of seawater acclimation at constant and diel temperatures on the growth, osmoregulation, and branchial phospholipid fatty acid (PLFA) composition in rainbow trout (Oncorhynchus mykiss). The fish (initial weight, 62.28 ± 0.41 g) were reared at a constant 13.0 °C (CT) or with a diel cycle of either 13.0 ± 1.0 °C (VT2) or 13.0 ± 2.0 °C (VT4) for 6 weeks, and subsequently subjected to seawater acclimation. Diel temperature variations (of up to 4 °C) did not affect the growth rate of rainbow trout maintained in freshwater, but alleviated the impairment on the growth after seawater challenge. Under all temperature conditions, rainbow trout were well prepared to seawater acclimation. The diel cyclic temperature resulted in fish with reduced fluctuations in plasma electrolyte levels, branchial Na+-K+ ATPase activity, and plasma osmolality. In freshwater, the sum of the monounsaturated fatty acids was significantly higher in the VT4 relative to CT and VT2 treatment. Conversely, the sum of polyunsaturated fatty acids was significantly lower in the VT4 fish. After seawater transfer, the branchial PLFA profiles of the fish significantly changed, but those in CT and VT2 did not recover afterwards (the degree of unsaturation was downregulated). The PLFA composition of fish in the VT4 treatment appeared to be steadier under seawater acclimation. This study suggests that a diel cyclic temperature (13.0 ± 2.0 °C) can alleviate the impairment of growth, enhance osmoregulation capability, and improve the stability of the branchial PLFA composition in rainbow trout after seawater acclimation.
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Affiliation(s)
- Jian Ge
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong Province, China
| | - Ming Huang
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong Province, China
| | - Yangen Zhou
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong Province, China.
| | - Qianlong Deng
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong Province, China
| | - Rongxin Liu
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong Province, China
| | - Qinfeng Gao
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong Province, China
| | - Yunwei Dong
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong Province, China
| | - Shuanglin Dong
- Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266100, Shandong Province, China.,Function Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266235, Shandong Province, China
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4
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Bolumar T, Orlien V, Sikes A, Aganovic K, Bak KH, Guyon C, Stübler AS, de Lamballerie M, Hertel C, Brüggemann DA. High-pressure processing of meat: Molecular impacts and industrial applications. Compr Rev Food Sci Food Saf 2020; 20:332-368. [PMID: 33443800 DOI: 10.1111/1541-4337.12670] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 10/12/2020] [Accepted: 10/14/2020] [Indexed: 12/22/2022]
Abstract
High-pressure processing (HPP) has been the most adopted nonthermal processing technology in the food industry with a current ever-growing implementation, and meat products represent about a quarter of the HPP foods. The intensive research conducted in the last decades has described the molecular impacts of HPP on microorganisms and endogenous meat components such as structural proteins, enzyme activities, myoglobin and meat color chemistry, and lipids, resulting in the characterization of the mechanisms responsible for most of the texture, color, and oxidative changes observed when meat is submitted to HPP. These molecular mechanisms with major effect on the safety and quality of muscle foods are comprehensively reviewed. The understanding of the high pressure-induced molecular impacts has permitted a directed use of the HPP technology, and nowadays, HPP is applied as a cold pasteurization method to inactive vegetative spoilage and pathogenic microorganisms in ready-to-eat cold cuts and to extend shelf life, allowing the reduction of food waste and the gain of market boundaries in a globalized economy. Yet, other applications of HPP have been explored in detail, namely, its use for meat tenderization and for structure formation in the manufacturing of processed meats, though these two practices have scarcely been taken up by industry. This review condenses the most pertinent-related knowledge that can unlock the utilization of these two mainstream transformation processes of meat and facilitate the development of healthier clean label processed meats and a rapid method for achieving sous vide tenderness. Finally, scientific and technological challenges still to be overcome are discussed in order to leverage the development of innovative applications using HPP technology for the future meat industry.
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Affiliation(s)
- Tomas Bolumar
- Department of Safety and Quality of Meat, Meat Technology, Max Rubner Institute (MRI), Kulmbach, Germany
| | - Vibeke Orlien
- Faculty of Science, Department of Food Science, University of Copenhagen, Frederiksberg C, Denmark
| | - Anita Sikes
- Department of Agriculture and Food, Commonwealth for Scientific and Industrial Research Organization (CSIRO), Brisbane, Australia
| | - Kemal Aganovic
- Advanced Technologies, German Institute of Food Technologies (DIL), Quakenbrück, Germany
| | - Kathrine H Bak
- Department of Food Technology and Veterinary Public Health, Institute of Food Safety, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Claire Guyon
- Food Science and Engineering (ONIRIS), Nantes-Atlantic National College of Veterinary Medicine, Nantes, France
| | - Anna-Sophie Stübler
- Advanced Technologies, German Institute of Food Technologies (DIL), Quakenbrück, Germany
| | - Marie de Lamballerie
- Food Science and Engineering (ONIRIS), Nantes-Atlantic National College of Veterinary Medicine, Nantes, France
| | - Christian Hertel
- Advanced Technologies, German Institute of Food Technologies (DIL), Quakenbrück, Germany
| | - Dagmar A Brüggemann
- Department of Safety and Quality of Meat, Meat Technology, Max Rubner Institute (MRI), Kulmbach, Germany
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5
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Chen J, Liang L, Li Y, Zhang H. Molecular Response to High Hydrostatic Pressure: Time-Series Transcriptomic Analysis of Shallow-Water Sea Cucumber Apostichopus japonicus. Front Genet 2020; 11:355. [PMID: 32425972 PMCID: PMC7203883 DOI: 10.3389/fgene.2020.00355] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 03/24/2020] [Indexed: 11/13/2022] Open
Abstract
Hydrostatic pressure is a key environmental factor constraining the benthic migration of shallow-water invertebrates. Although many studies have examined the physiological effects of high hydrostatic pressure on shallow-water invertebrates, the molecular response to high pressure is not fully understood. This question has received increasing attention because ocean warming is forcing the bathymetric migrations of shallow-water invertebrates. Here, we applied time-series transcriptomic analysis to high-pressure incubated and atmospheric pressure-recovered shallow-water sea cucumber (Apostichopus japonicus) to address this question. A total of 44 samples from 15 experimental groups were sequenced. Our results showed that most genes responded to pressure stress at the beginning when pressure was changed, but significant differences of gene expression appeared after 4 to 6 h. Transcription was the most sensitive biological process responding to high-pressure exposure, which was enriched among up-regulated genes after 2 h, followed by ubiquitination (4 h), endocytosis (6 h), stress response (6 h), methylation regulation (24 h), and transmembrane transportation (24 h). After high-pressure incubation, all these biological processes remained up-regulated within 4–6 h at atmospheric pressure. Overall, our results revealed the dynamic transcriptional response of A. japonicus to high-pressure exposure. Additionally, few quantitative or functional responses related to A. japonicus on transcriptional level were introduced by hydrostatic pressure changes after 1 h, and main biological responses were introduced after 4 h, suggesting that, when hydrostatic pressure is the mainly changed environmental factor, it will be better to fix sea cucumber samples for transcriptomic analysis within 1 h, but 4 h will be also acceptable.
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Affiliation(s)
- Jiawei Chen
- Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, China.,College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Linying Liang
- Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, China.,College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Yanan Li
- Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, China.,College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Haibin Zhang
- Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, China
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6
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A novel ER membrane protein Ehg1/May24 plays a critical role in maintaining multiple nutrient permeases in yeast under high-pressure perturbation. Sci Rep 2019; 9:18341. [PMID: 31797992 PMCID: PMC6892922 DOI: 10.1038/s41598-019-54925-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 11/19/2019] [Indexed: 12/24/2022] Open
Abstract
Previously, we isolated 84 deletion mutants in Saccharomyces cerevisiae auxotrophic background that exhibited hypersensitive growth under high hydrostatic pressure and/or low temperature. Here, we observed that 24 deletion mutants were rescued by the introduction of four plasmids (LEU2, HIS3, LYS2, and URA3) together to grow at 25 MPa, thereby suggesting close links between the genes and nutrient uptake. Most of the highly ranked genes were poorly characterized, including MAY24/YPR153W. May24 appeared to be localized in the endoplasmic reticulum (ER) membrane. Therefore, we designated this gene as EHG (ER-associated high-pressure growth gene) 1. Deletion of EHG1 led to reduced nutrient transport rates and decreases in the nutrient permease levels at 25 MPa. These results suggest that Ehg1 is required for the stability and functionality of the permeases under high pressure. Ehg1 physically interacted with nutrient permeases Hip1, Bap2, and Fur4; however, alanine substitutions for Pro17, Phe19, and Pro20, which were highly conserved among Ehg1 homologues in various yeast species, eliminated interactions with the permeases as well as the high-pressure growth ability. By functioning as a novel chaperone that facilitated coping with high-pressure-induced perturbations, Ehg1 could exert a stabilizing effect on nutrient permeases when they are present in the ER.
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7
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Winter R. Interrogating the Structural Dynamics and Energetics of Biomolecular Systems with Pressure Modulation. Annu Rev Biophys 2019; 48:441-463. [DOI: 10.1146/annurev-biophys-052118-115601] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
High hydrostatic pressure affects the structure, dynamics, and stability of biomolecular systems and is a key parameter in the context of the exploration of the origin and the physical limits of life. This review lays out the conceptual framework for exploring the conformational fluctuations, dynamical properties, and activity of biomolecular systems using pressure perturbation. Complementary pressure-jump relaxation studies are useful tools to study the kinetics and mechanisms of biomolecular phase transitions and structural transformations, such as membrane fusion or protein and nucleic acid folding. Finally, the advantages of using pressure to explore biomolecular assemblies and modulate enzymatic reactions are discussed.
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Affiliation(s)
- Roland Winter
- Faculty of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44227 Dortmund, Germany
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8
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Chen J, Liu H, Cai S, Zhang H. Comparative transcriptome analysis of Eogammarus possjeticus at different hydrostatic pressure and temperature exposures. Sci Rep 2019; 9:3456. [PMID: 30837550 PMCID: PMC6401005 DOI: 10.1038/s41598-019-39716-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Accepted: 01/25/2019] [Indexed: 12/19/2022] Open
Abstract
Hydrostatic pressure is an important environmental factor affecting the vertical distribution of marine organisms. Laboratory-based studies have shown that many extant shallow-water marine benthic invertebrates can tolerate hydrostatic pressure outside their known natural distributions. However, only a few studies have focused on the molecular mechanisms of pressure acclimatisation. In the present work, we examined the pressure tolerance of the shallow-water amphipod Eogammarus possjeticus at various temperatures (5, 10, 15, and 20 °C) and hydrostatic pressures (0.1–30 MPa) for 16 h. Six of these experimental groups were used for transcriptome analysis. We found that 100% of E. possjeticus survived under 20 MPa at all temperature conditions for 16 h. Sequence assembly resulted in 138, 304 unigenes. Results of differential expression analysis revealed that 94 well-annotated genes were up-regulated under high pressure. All these findings indicated that the pressure tolerance of E. possjeticus was related to temperature. Several biological processes including energy metabolism, antioxidation, immunity, lipid metabolism, membrane-related process, genetic information processing, and DNA repair are probably involved in the acclimatisation in deep-sea environments.
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Affiliation(s)
- Jiawei Chen
- Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Helu Liu
- Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China
| | - Shanya Cai
- Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Haibin Zhang
- Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China.
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9
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Reduced TCA cycle rates at high hydrostatic pressure hinder hydrocarbon degradation and obligate oil degraders in natural, deep-sea microbial communities. ISME JOURNAL 2018; 13:1004-1018. [PMID: 30542078 DOI: 10.1038/s41396-018-0324-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 09/12/2018] [Accepted: 11/17/2018] [Indexed: 12/30/2022]
Abstract
Petroleum hydrocarbons reach the deep-sea following natural and anthropogenic factors. The process by which they enter deep-sea microbial food webs and impact the biogeochemical cycling of carbon and other elements is unclear. Hydrostatic pressure (HP) is a distinctive parameter of the deep sea, although rarely investigated. Whether HP alone affects the assembly and activity of oil-degrading communities remains to be resolved. Here we have demonstrated that hydrocarbon degradation in deep-sea microbial communities is lower at native HP (10 MPa, about 1000 m below sea surface level) than at ambient pressure. In long-term enrichments, increased HP selectively inhibited obligate hydrocarbon-degraders and downregulated the expression of beta-oxidation-related proteins (i.e., the main hydrocarbon-degradation pathway) resulting in low cell growth and CO2 production. Short-term experiments with HP-adapted synthetic communities confirmed this data, revealing a HP-dependent accumulation of citrate and dihydroxyacetone. Citrate accumulation suggests rates of aerobic oxidation of fatty acids in the TCA cycle were reduced. Dihydroxyacetone is connected to citrate through glycerol metabolism and glycolysis, both upregulated with increased HP. High degradation rates by obligate hydrocarbon-degraders may thus be unfavourable at increased HP, explaining their selective suppression. Through lab-scale cultivation, the present study is the first to highlight a link between impaired cell metabolism and microbial community assembly in hydrocarbon degradation at high HP. Overall, this data indicate that hydrocarbons fate differs substantially in surface waters as compared to deep-sea environments, with in situ low temperature and limited nutrients availability expected to further prolong hydrocarbons persistence at deep sea.
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10
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Abstract
High pressure (1 to 10 kbars, i.e. 100-1000 MPa) affects biological constituents and systems. Several physicochemical properties of water are modified, such as the density, the ionic dissociation (and pH), and the melting point of ice. Pressure-induced unfolding, aggregation, and gelation of food proteins mainly depend on the effects of pressure on various noncovalent bonds and interactions. Enzyme inactivation (e.g., of ATPases) also results from similar effects, but some enzymes, including oxidative enzymes from fruits and vegetables, are strongly baroresistant. Chemical reactions, macromolecular transconformations, changes in membrane structure, or changes in crystal form and melting point that are accompanied by a decrease in volume are enhanced under pressure (and vice versa). Several of these phenomena, still poorly identified, are involved in the high inactivation ratio (5–6 logarithmic cycles) of most vegetative microbial cells: gram-negative bacteria, yeasts, complex viruses, molds, and gram-positive bacteria, in this decreasing order of sensitivity to pressure. Much variability is noted in the baroresistance of microorganisms, even within one single species or genus. Other parameters influence this resistance: pressure level, holding time (a two-phase kinetics of inactivation is often observed that prevents the calculation of decimal reduction times), temperature of pressure processing (temperatures above 50°C or between –30 and +5°C enhancing inactivation), composition of the medium or of the food (the pH having apparently little influence, but high salt or sugar concentrations, and low water contents, exerting very strong baroprotective effects).Taking into account the baroprotective effects of some food constituents and the strong resistance of some microbial strains, recent research aims at combined processes in which high pressure is associated with moderate temperature, CO2, other bacteriostatic agents, or to nonthermal physical processes such as ultrasounds, alternative currents, high-voltage electric pulses, and so forth. The safety and refrigerated shelf life of pressurized foods could be maintained or extended, while the sensorial quality should improve due to the reduced severity of thermal processing. Further research is, however, needed for the regulatory authorities to assess and accept these novel foods and processes.
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Affiliation(s)
- J. Claude Cheftel
- Unité de Biochimie et Technologie Alimentaires, Centre de Génie Biologique et Sciences des Aliments, Université de Montpellier II, Montpellier, France
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11
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Earliest events in α-synuclein fibrillation probed with the fluorescence of intrinsic tyrosines. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 154:16-23. [DOI: 10.1016/j.jphotobiol.2015.11.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 11/06/2015] [Accepted: 11/10/2015] [Indexed: 01/10/2023]
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12
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Abstract
We review the combined effect of temperature and pressure on the structure, dynamics and phase behavior of lipid bilayers, differing in chain length, headgroup structure and composition as revealed by thermodynamic, spectroscopic and scattering experiments. The effect of additives, such as ions, cholesterol, and anaesthetics is discussed as well. Our data include also reports on the effect of pressure on the lateral organization of heterogeneous lipid membranes and lipid extracts from cellular membranes, as well as the influence of peptide and protein incorporation on the pressure-dependent structure and phase behavior of lipid membranes. Moreover, the effects of pressure on membrane protein function are summarized. Finally, we introduce pressure as a kinetic variable for studying the kinetics of various lipid phase transformations.
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Affiliation(s)
- Roland Winter
- Physical Chemistry I - Biophysical Chemistry, TU Dortmund University, Otto-Hahn Str. 6, D-44227, Dortmund, Germany,
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13
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Seeliger J, Erwin N, Rosin C, Kahse M, Weise K, Winter R. Exploring the structure and phase behavior of plasma membrane vesicles under extreme environmental conditions. Phys Chem Chem Phys 2015; 17:7507-13. [DOI: 10.1039/c4cp05845c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A protocol was developed to generate GPMVs showing phase separation under ambient conditions and theirp,T-dependent phase behavior was studied.
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Affiliation(s)
- Janine Seeliger
- Physical Chemistry I – Biophysical Chemistry
- Department of Chemistry and Chemical Biology
- TU Dortmund University
- 44227 Dortmund
- Germany
| | - Nelli Erwin
- Physical Chemistry I – Biophysical Chemistry
- Department of Chemistry and Chemical Biology
- TU Dortmund University
- 44227 Dortmund
- Germany
| | - Christopher Rosin
- Physical Chemistry I – Biophysical Chemistry
- Department of Chemistry and Chemical Biology
- TU Dortmund University
- 44227 Dortmund
- Germany
| | - Marie Kahse
- Physical Chemistry I – Biophysical Chemistry
- Department of Chemistry and Chemical Biology
- TU Dortmund University
- 44227 Dortmund
- Germany
| | - Katrin Weise
- Physical Chemistry I – Biophysical Chemistry
- Department of Chemistry and Chemical Biology
- TU Dortmund University
- 44227 Dortmund
- Germany
| | - Roland Winter
- Physical Chemistry I – Biophysical Chemistry
- Department of Chemistry and Chemical Biology
- TU Dortmund University
- 44227 Dortmund
- Germany
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14
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Silva JL, Oliveira AC, Vieira TCRG, de Oliveira GAP, Suarez MC, Foguel D. High-Pressure Chemical Biology and Biotechnology. Chem Rev 2014; 114:7239-67. [DOI: 10.1021/cr400204z] [Citation(s) in RCA: 152] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jerson L. Silva
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Andrea C. Oliveira
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Tuane C. R. G. Vieira
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Guilherme A. P. de Oliveira
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Marisa C. Suarez
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Debora Foguel
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
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15
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Alcohol-induced oxidative/nitrosative stress alters brain mitochondrial membrane properties. Mol Cell Biochem 2012; 375:39-47. [PMID: 23212448 DOI: 10.1007/s11010-012-1526-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Accepted: 11/23/2012] [Indexed: 10/27/2022]
Abstract
Chronic alcohol consumption causes numerous biochemical and biophysical changes in the central nervous system, in which mitochondria is the primary organelle affected. In the present study, we hypothesized that alcohol alters the mitochondrial membrane properties and leads to mitochondrial dysfunction via mitochondrial reactive oxygen species (mROS) and reactive nitrogen species (RNS). Alcohol-induced hypoxia further enhances these effects. Administration of alcohol to rats significantly increased the mitochondrial lipid peroxidation and protein oxidation with decreased SOD2 mRNA and protein expression was decreased, while nitric oxide (NO) levels and expression of iNOS and nNOS in brain cortex were increased. In addition, alcohol augmented HIF-1α mRNA and protein expression in the brain cortex. Results from this study showed that alcohol administration to rats decreased mitochondrial complex I, III, IV activities, Na(+)/K(+)-ATPase activity and cardiolipin content with increased anisotropic value. Cardiolipin regulates numerous enzyme activities, especially those related to oxidative phosphorylation and coupled respiration. In the present study, decreased cardiolipin could be ascribed to ROS/RNS-induced damage. In conclusion, alcohol-induced ROS/RNS is responsible for the altered mitochondrial membrane properties, and alcohol-induced hypoxia further enhance these alterations, which ultimately leads to mitochondrial dysfunction.
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16
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Differential toxicity of Mn2+ and Mn3+ to rat liver tissues: Oxidative damage, membrane fluidity and histopathological changes. ACTA ACUST UNITED AC 2012; 64:197-203. [DOI: 10.1016/j.etp.2010.08.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Revised: 06/27/2010] [Accepted: 08/10/2010] [Indexed: 12/23/2022]
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17
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Goto M, Matsui T, Tamai N, Matsuki H, Kaneshina S. Prodan fluorescence detects the bilayer packing of asymmetric phospholipids. Colloids Surf B Biointerfaces 2011; 84:55-62. [DOI: 10.1016/j.colsurfb.2010.12.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Revised: 12/08/2010] [Accepted: 12/08/2010] [Indexed: 10/18/2022]
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18
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Simão F, Matté A, Matté C, Soares FMS, Wyse ATS, Netto CA, Salbego CG. Resveratrol prevents oxidative stress and inhibition of Na(+)K(+)-ATPase activity induced by transient global cerebral ischemia in rats. J Nutr Biochem 2011; 22:921-8. [PMID: 21208792 DOI: 10.1016/j.jnutbio.2010.07.013] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2010] [Revised: 07/22/2010] [Accepted: 07/28/2010] [Indexed: 11/19/2022]
Abstract
Increased oxidative stress and energy metabolism deficit have been regarded as an important underlying cause for neuronal damage induced by cerebral ischemia/reperfusion (I/R) injury. In this study, we investigated the oxidative mechanisms underlying the neuroprotective effects of resveratrol, a potent polyphenol antioxidant found in grapes, on structural and biochemical abnormalities in rats subjected to global cerebral ischemia. Experimental model of transient global cerebral ischemia was induced in Wistar rats by the four vessel occlusion method for 10 min and followed by different periods of reperfusion. Nissl and fluoro jade C stained indicated extensive neuronal death at 7 days after I/R. These findings were preceded by a rapid increase in the generation of reactive oxygen species (ROS), nitric oxide (NO), lipid peroxidation, as well as by a decrease in Na(+)K(+)-ATPase activity and disrupted antioxidant defenses (enzymatic and non-enzymatic) in hippocampus and cortex. Administrating resveratrol 7 days prior to ischemia by intraperitoneal injections (30 mg/kg) significantly attenuated neuronal death in both studied structures, as well as decreased the generation of ROS, lipid peroxidation and NO content. Furthermore, resveratrol brought antioxidant and Na(+)K(+)-ATPase activity in cortex and hippocampus back to normal levels. These results support that resveratrol could be used as a preventive, or therapeutic, agent in global cerebral ischemia and suggest that scavenging of ROS contributes, at least in part, to resveratrol-induced neuroprotection.
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Affiliation(s)
- Fabrício Simão
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, UFRGS, Porto Alegre, RS, Brazil
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19
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Winter R. Exploring the Energy and Conformational Landscape of Biomolecules Under Extreme Conditions. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/978-90-481-9258-8_47] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2023]
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20
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Kade I, Nogueira C, Rocha J. Diphenyl diselenide and streptozotocin did not alter cerebral glutamatergic and cholinergic systems but modulate antioxidant status and sodium pump in diabetic rats. Brain Res 2009; 1284:202-11. [DOI: 10.1016/j.brainres.2009.04.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Revised: 03/31/2009] [Accepted: 04/02/2009] [Indexed: 11/26/2022]
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21
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Koo KI, Bae JH, Lee CH, Yoon CD, Pyun JH, Shin SH, Jeon YC, Bae MK, Jang HO, Wood WG, Yun I. The effect of bupivacaine.HCl on the physical properties of neuronal membranes. PROTOPLASMA 2008; 234:3-12. [PMID: 18797982 DOI: 10.1007/s00709-008-0017-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2008] [Accepted: 08/25/2008] [Indexed: 05/26/2023]
Abstract
Fluorescent probe techniques were used to evaluate the effect of bupivacaine.HCl on the physical properties (transbilayer asymmetric lateral and rotational mobilities, annular lipid fluidity and protein distribution) of synaptosomal plasma membrane vesicles (SPMVs) isolated from bovine cerebral cortex. An experimental procedure was used based on selective quenching of both 1,3-di(1-pyrenyl)propane (Py-3-Py) and 1,6-diphenyl-1,3,5-hexatriene (DPH) by trinitrophenyl groups, and radiationless energy transfer (RET) from the tryptophans of membrane proteins to Py-3-Py. Bupivacaine.HCl increased the bulk lateral and rotational mobilities, and annular lipid fluidity in SPMVs lipid bilayers, and had a greater fluidizing effect on the inner monolayer than that of the outer monolayer. The magnitude of increasing effect on annular lipid fluidity in SPMVs lipid bilayer induced by bupivacaine.HCl was significantly far greater than magnitude of increasing effect of the drug on the lateral and rotational mobilities of bulk SPMVs lipid bilayer. It also caused membrane proteins to cluster. These effects of bupivacaine.HCl on neuronal membranes may be responsible for some, though not all, of the local anesthetic actions of bupivacaine.HCl.
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Affiliation(s)
- K I Koo
- Department of Dental Pharmacology and Biophysics, Pusan National University, Busan, 602-739, South Korea
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22
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Periasamy N, Teichert H, Weise K, Vogel RF, Winter R. Effects of temperature and pressure on the lateral organization of model membranes with functionally reconstituted multidrug transporter LmrA. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1788:390-401. [PMID: 18983816 DOI: 10.1016/j.bbamem.2008.09.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Revised: 09/19/2008] [Accepted: 09/24/2008] [Indexed: 11/29/2022]
Abstract
To contribute to the understanding of membrane protein function upon application of pressure, we investigated the influence of hydrostatic pressure on the conformational order and phase behavior of the multidrug transporter LmrA in biomembrane systems. To this end, the membrane protein was reconstituted into various lipid bilayer systems of different chain length, conformation, phase state and heterogeneity, including raft model mixtures as well as some natural lipid extracts. In the first step, we determined the temperature stability of the protein itself and verified its reconstitution into the lipid bilayer systems using CD spectroscopic and AFM measurements, respectively. Then, to yield information on the temperature and pressure dependent conformation and phase state of the lipid bilayer systems, generalized polarization values by the Laurdan fluorescence technique were determined, which report on the conformation and phase state of the lipid bilayer system. The temperature-dependent measurements were carried out in the temperature range 5-70 degrees C, and the pressure dependent measurements were performed in the range 1-200 MPa. The data show that the effect of the LmrA reconstitution on the conformation and phase state of the lipid matrix depends on the fluidity and hydrophobic matching conditions of the lipid system. The effect is most pronounced for fluid DMPC and DMPC with low cholesterol levels, but minor for longer-chain fluid phospholipids such as DOPC and model raft mixtures such as DOPC/DPPC/cholesterol. The latter have the additional advantage of using lipid sorting to avoid substantial hydrophobic mismatch. Notably, the most drastic effect was observed for the neutral/glycolipid natural lipid mixture. In this case, the impact of LmrA incorporation on the increase of the conformational order of the lipid membrane was most pronounced. As a consequence, the membrane reaches a mechanical stability which makes it very insensitive to application of pressures as high as 200 MPa. The results are correlated with the functional properties of LmrA in these various lipid environments and upon application of high hydrostatic pressure and are discussed in the context of other work on pressure effects on membrane protein systems.
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Affiliation(s)
- Nagarajan Periasamy
- Dortmund University of Technology, Physical Chemistry I - Biophysical Chemistry, D-44227 Dortmund, Germany
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23
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Lee JH, Kim DI, Mun H, Lee SK, Park JS, Kim JH, Lee JH, Park YH, Jeon YC, Yoon UC, Bae MK, Jang HO, Wood WG, Yun I. The effect of propoxycaine·HCl on the physical properties of neuronal membranes. Chem Phys Lipids 2008; 154:19-25. [DOI: 10.1016/j.chemphyslip.2008.03.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2007] [Revised: 01/30/2008] [Accepted: 03/13/2008] [Indexed: 11/30/2022]
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24
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Sitaramam V, Pachapurkar S, Gokhale T. The alternative oxidase mediated respiration contributes to growth, resistance to hyperosmotic media and accumulation of secondary metabolites in three species. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2008; 14:235-51. [PMID: 23572891 PMCID: PMC3550620 DOI: 10.1007/s12298-008-0023-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Plant respiration, similar to respiration in animal mitochondria, exhibits both osmosensitive and insensitive components with the clear distinction that the insensitive respiration in plants is quantitatively better described as 'less' sensitive rather than 'insensitive'. Salicylic hydroxamic acid (SHAM)-sensitive respiration was compared with the respiration sensitive to other inhibitors in rice, yeast and Dunaliella salina. The influence of SHAM was largely in the osmotically less sensitive component and enhanced with external osmotic pressure unlike other inhibitors that inhibited the osmotically sensitive component. SHAM inhibited germination and root growth but not shoot growth. Osmotic remediation of respiration that developed in due course of time with rice seedlings was abolished by SHAM and was not due to water and ionic uptake mechanisms. Yeast and Dunaliella also showed susceptibility of growth and respiration to SHAM. Glycerol retention was influenced by all inhibitors, while growth was inhibited demonstrably by SHAM in Dunaliella. Respiration in plants needs to be seen as a positive contribution to overall growth and not merely for burning away of the biomass.
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Affiliation(s)
- V. Sitaramam
- Department of Biotechnology, University of Pune, Pune, 411 007 India
| | | | - Trupti Gokhale
- Department of Biotechnology, University of Pune, Pune, 411 007 India
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25
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The temperature–pressure phase diagram of a DPPC–ergosterol fungal model membrane—a SAXS and FT-IR spectroscopy study. Chem Phys Lipids 2008; 152:57-63. [DOI: 10.1016/j.chemphyslip.2008.01.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2007] [Revised: 12/29/2007] [Accepted: 01/04/2008] [Indexed: 11/18/2022]
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26
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Kusube M, Tamai N, Matsuki H, Kaneshina S. Pressure-induced phase transitions of lipid bilayers observed by fluorescent probes Prodan and Laurdan. Biophys Chem 2008; 117:199-206. [PMID: 15961215 DOI: 10.1016/j.bpc.2005.05.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2005] [Revised: 05/24/2005] [Accepted: 05/24/2005] [Indexed: 11/20/2022]
Abstract
The fluorescence spectra of 6-propionyl-2-(dimethylamino)naphthalene (Prodan) and 6-dodecanoyl-2-(dimethylamino)naphthalene (Laurdan) in bilayer membranes of 1,2-distearoylphosphatidylcholine (DSPC) were observed as a function of pressure at constant temperature. The emission spectra of Prodan and Laurdan varied with the pressure-induced states of bilayer membranes. The maximum emission wavelength (lambda(max)) of Prodan characteristic of the liquid crystalline (L(alpha)), lamellar gel (L(beta)') and pressure-induced interdigitated gel (L(beta)I) phases of the DSPC bilayer was 480, 440 and 500 nm, respectively. On the other hand, the lambda(max) of Laurdan characteristic of the L(alpha) and L(beta)' phases was 480 and 440 nm in a similar manner as Prodan probe. However, no change in the lambda(max) was observed in spite of the occurrence of the interdigitation of bilayer. Since the lambda(max) reflects the solvent property around the probe molecules, we could speculate about the location of fluorescent probe in the bilayer membranes. In the L(alpha) phase the same chromophore group of Prodan and Laurdan probes distributes around phosphate group of lipid (i.e., polar region). The transformation of bilayer into the L(beta)' phase causes the Prodan and Laurdan molecules to move into the glycerol backbone (i.e., less polar) region. In the ripple gel (P(beta)') phase, the emission spectrum of Prodan shows a broad peak at about 480 nm and a shoulder around 440 nm, which means that the Prodan molecules are widespread over the wide range from the glycerol backbone to the hydrophilic part of bilayer. The P(beta)'/L(beta)I phase transition causes the Prodan molecule to squeeze out from the glycerol backbone region and to move the hydrophilic region near the bilayer surface. Contrarily, the Laurdan molecule was not squeezed out from the glycerol backbone region because the long acyl chain of Laurdan serves as an anchor in the hydrophobic core of bilayer. The ratio of fluorescence intensity of Prodan at 480 nm to that at 440 nm, F(480)/F(440), is available to observation of bilayer phase transitions. The plot of F(480)/F(440) versus pressure seems to be useful for the recognition of bilayer phase transition, especially the bilayer interdigitation.
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Affiliation(s)
- Masataka Kusube
- Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
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27
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Lee YH, Park NS, Kwon JD, Park JS, Shin GB, Lee CS, Jung TS, Choi NJ, Yoon JH, Ok JS, Yoon UC, Bae MK, Jang HO, Yun I. Amphiphilic effects of dibucaine·HCl on rotational mobility of n-(9-anthroyloxy)stearic acid in neuronal and model membranes. Chem Phys Lipids 2007; 146:33-42. [PMID: 17241620 DOI: 10.1016/j.chemphyslip.2006.12.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2006] [Revised: 12/19/2006] [Accepted: 12/21/2006] [Indexed: 11/21/2022]
Abstract
We studied dibucaine's effects on specific locations of n-(9-anthroyloxy)palmitic acid or stearic acid (n-AS) within phospholipids of synaptosomal plasma membrane vesicles isolated from bovine cerebral cortex (SPMV) and model membranes. Giant unilamellar vesicles (GUVs) were prepared with total lipids (SPMVTL) and mixture of several phospholipids (SPMVPL) extracted from SPMV. Dibucaine.HCl increased rotational mobility (increased disordering) of hydrocarbon interior, but it decreased mobility (increased ordering) of membrane interface, in both native and model membranes. The degree of rotational mobility in accordance with the carbon atom numbers of phospholipids comprising neuronal and model membranes was in the order at the 16, 12, 9, 6 and 2 position of aliphatic chain present in phospholipids. The sensitivity of increasing or decreasing effect of rotational mobility of hydrocarbon interior or surface region by dibucaine.HCl differed depending on the neuronal and model membranes in the descending order of SPMV, SPMVPL and SPMVTL.
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Affiliation(s)
- Young-Ho Lee
- Department of Dental Pharmacology and Biophysics, College of Dentistry and Research Institute for Oral Biotechnology, Pusan National University, Busan 602-739, Republic of Korea
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28
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Cuevas FJ, Jameson DM, Sotomayor CP. Modulation of reconstituted pig kidney Na+/K(+)-ATPase activity by cholesterol in endogenous lipid vesicles: role of lipid domains. Biochemistry 2007; 45:13855-68. [PMID: 17105204 DOI: 10.1021/bi061351e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diverse experimental and theoretical evidence suggests that plasma membranes contain cholesterol-induced segregated domains that could play a key role in the modulation of membrane functions, including intrinsic enzyme activity. To gain insight into the role of cholesterol, we reconstituted pig kidney Na+/K+-ATPase into unilamellar vesicles of endogenous lipids mimicking the natural membrane and addressed the question of how modification of the cholesterol content could affect the ATPase activity via changes in the membrane lipid phase and in the protein structure and dynamics. We used steady-state and time-resolved fluorescence spectroscopy with the lipid phase probes DPH and Laurdan and the protein probe fluorescein and also used infrared spectroscopy using attenuated total reflectance. Upon modification of membrane cholesterol content, the ATPase activity did not change monotonically but instead exhibited abrupt changes resulting in two peaks at or close to critical cholesterol mole fractions (25 and 33.3 mol %) predicted by the superlattice or regular distribution model. Fluorescence parameters associated with the membrane probes also showed abrupt changes with peaks, coincident with the cholesterol concentrations associated with the peaks in the enzyme activity, while parameters associated with the protein probes also showed slight but abrupt changes resulting in dips at the same cholesterol concentrations. Notably, the IR amide I band maximum also showed spectral shifts, characterized by a frequency variation pattern with peaks at the same cholesterol concentrations. Overall, these results indicate that the lipid phase had slightly lower hydration, at or near the two critical cholesterol concentrations predicted by the superlattice theory. However, in the protein domains monitored there was a slight but significant hydration increase along with increased peptide backbone flexibility at these cholesterol concentrations. We propose that in the vicinity of the critical mole fractions, where superlattice formation can occur, minute changes in cholesterol concentration produce abrupt changes in the membrane organization, increasing interdomain surfaces. These changes, in turn, induce small changes in the protein's structure and dynamics, therefore acting to fine-tune the enzyme.
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Affiliation(s)
- Francisco J Cuevas
- Instituto de Química, Pontificia Universidad Catolica de Valparaiso, Av. Brasil 2950, Valparaíso, Chile
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29
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Nicolini C, Celli A, Gratton E, Winter R. Pressure tuning of the morphology of heterogeneous lipid vesicles: a two-photon-excitation fluorescence microscopy study. Biophys J 2006; 91:2936-42. [PMID: 16877511 PMCID: PMC1578477 DOI: 10.1529/biophysj.106.088716] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
We used a technique that allows us to visualize local and morphological changes of the membrane of more component giant unilamellar vesicles due to high pressure perturbation. Under these conditions, thermally induced processes are largely suppressed, and the bending rigidity and line tension are influenced by pressure-induced changes in lipid molecular packing and shape only. We studied the effect of pressure on the lateral organization and morphology of the model raft system DOPC (1,2-dioleoyl-sn-glycero-3-phosphocholine)/sphingomyelin/cholesterol as well as of the fluid mixture POPC (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine)/DLPC (1,2-dilauroyl-sn-glycero-3-phosphocholine) by two-photon excitation fluorescence microscopy. The pressure-dependent experiments were carried out using a sample cell made from a thin fused silica capillary. The use of Laurdan as fluorescence label allowed us to also follow the lipid phase state by calculating the generalized polarization (GP) values of the vesicles and extracting their average value. During the compression cycle, a reduction in the volume of the vesicles is observed, accompanied by an increase of the average GP value, indicating an increasingly tighter packing of the lipids. Interestingly, the two systems studied show phenomena of budding and fission, and these at surprisingly low pressures of 200-300 bar. Moreover, these budding processes are not directly related to phase transitions to an overall ordered conformational state of the lipid membrane, which occur at much higher pressures. The topological changes of the lipid vesicles are irreversible and exhibit a different behavior depending on whether the pressure is increased or decreased. The results are discussed in light of the various contributions to the free energy functional of lipid vesicles. Finally, the biological relevance of these studies is highlighted.
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Affiliation(s)
- Chiara Nicolini
- University of Dortmund, Department of Chemistry, Physical Chemistry I-Biophysical Chemistry, D-44227 Dortmund, Germany
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30
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Nicolini C, Kraineva J, Khurana M, Periasamy N, Funari SS, Winter R. Temperature and pressure effects on structural and conformational properties of POPC/SM/cholesterol model raft mixtures--a FT-IR, SAXS, DSC, PPC and Laurdan fluorescence spectroscopy study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2006; 1758:248-58. [PMID: 16529710 DOI: 10.1016/j.bbamem.2006.01.019] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2005] [Revised: 01/24/2006] [Accepted: 01/26/2006] [Indexed: 11/17/2022]
Abstract
We report on the effects of temperature and pressure on the structure, conformation and phase behavior of aqueous dispersions of the model lipid "raft" mixture palmitoyloleoylphosphatidylcholine (POPC)/bovine brain sphingomyelin (SM)/cholesterol (Chol) (1:1:1). We investigated interchain interactions, hydrogen bonding, conformational and structural properties as well as phase transformations of this system using Fourier transform-infrared (FT-IR) spectroscopy, small-angle X-ray scattering (SAXS), differential scanning calorimetry (DSC) coupled with pressure perturbation calorimetry (PPC), and Laurdan fluorescence spectroscopy. The IR spectral parameters in combination with the scattering patterns from the SAXS measurements were used to detect structural and conformational transformations upon changes of pressure up to 7-9 kbar and temperature in the range from 1 to about 80 degrees C. The generalized polarization function (GP) values, obtained from the Laurdan fluorescence spectroscopy studies also reveal temperature and pressure dependent phase changes. DSC and PPC were used to detect thermodynamic properties accompanying the temperature-dependent phase changes. In combination with literature fluorescence spectroscopy and microscopy data, a tentative p,T stability diagram of the mixture has been established. The data reveal a broad liquid-order/solid-ordered (lo+so) two-phase coexistence region below 8+/-2 degrees C at ambient pressure. With increasing temperature, a lo+ld+so three-phase region is formed, which extends up to approximately 27 degrees C, where a liquid-ordered/liquid-disordered (lo+ld) immiscibility region is formed. Finally, above 48+/-2 degrees C, the POPC/SM/Chol (1:1:1) mixture becomes completely fluid-like (liquid-disordered, ld). With increasing pressure, all phase transition lines shift to higher temperatures. Notably, the lo+ld (+so) phase coexistence region, mimicking raft-like lateral phase separation in natural membranes, extends over a rather wide temperature range of about 40 degrees C, and a pressure range, which extends up to about 2 kbar for T=37 degrees C. Interestingly, in this pressure range, ceasing of membrane protein function in natural membrane environments has been observed for a variety of systems.
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Affiliation(s)
- Chiara Nicolini
- University of Dortmund, Department of Chemistry, Physical Chemistry I-Biophysical Chemistry, Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany
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31
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Eisenblätter J, Winter R. Pressure effects on the structure and phase behavior of DMPC-gramicidin lipid bilayers: a synchrotron SAXS and 2H-NMR spectroscopy study. Biophys J 2005; 90:956-66. [PMID: 16299078 PMCID: PMC1367120 DOI: 10.1529/biophysj.105.069799] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The influence of Gramicidin D (GD) incorporation on the structure and phase behavior of aqueous dispersions of DMPC lipid bilayers has been studied using small-angle x-ray scattering (SAXS) and (2)H-NMR spectroscopy. The experiments covered a temperature range from -10 degrees C to 60 degrees C and a pressure range of 0.001-4 kbar. Pressure was used to be able to tune the lipid bilayer conformational order and phase state and because high pressure is an important feature of certain natural biotopes. The data show that, depending on the GD concentration, the structure of the temperature- and pressure-dependent lipid phases is significantly altered by the insertion of the polypeptide, and a p,T-phase diagram could be obtained for intermediate GD concentrations. Upon gramicidin insertion, a rather narrow fluid-gel coexistence regions is formed. Two gel phases are induced which are different from those of the pure lipid bilayer system and which separate at low temperatures/high pressures. For both the temperature- and pressure-induced fluid-to-gel transition, a similar pseudocritical transitional behavior is observed, which is even more pronounced upon incorporation of the peptide.
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Affiliation(s)
- J Eisenblätter
- Department of Chemistry, Physical Chemistry I-Biophysical Chemistry, University of Dortmund, D-44227 Dortmund, Germany
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32
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Periasamy N, Winter R. The effects of temperature, pressure and peptide incorporation on ternary model raft mixtures--a Laurdan fluorescence spectroscopy study. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2005; 1764:398-404. [PMID: 16330267 DOI: 10.1016/j.bbapap.2005.10.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2005] [Revised: 10/14/2005] [Accepted: 10/17/2005] [Indexed: 11/21/2022]
Abstract
Recently, an increasing evidence accumulated for the existence of lipid microdomains, called lipid rafts, in cell membranes, which may play an important role in many important membrane-associated biological processes. Suitable model systems for studying biophysical properties of lipid rafts are lipid vesicles composed of three-component lipid mixtures, such as POPC/SM/cholesterol, which exhibit a rich phase diagram, including raft-like liquid-ordered/liquid-disordered phase coexistence regions. We explored the temperature, pressure and concentration-dependent phase behavior of such canonical model raft mixtures using the Laurdan fluorescence spectroscopic technique. Hydrostatic pressure has not only been used as a physical parameter for studying the stability and energetics of these systems, but also because high pressure is an important feature of certain natural membrane environments. We show that the liquid-disordered/liquid-ordered phase coexistence regions of POPC/SM/cholesterol model raft mixtures extends over a very wide temperature range of about 50 degrees C. Upon pressurization, an overall ordered membrane state is reached at pressures of approximately 1,000 bar at 20 degrees C, and of approximately 2,000 bar at 40 degrees C. Incorporation of 5 mol% gramicidin as a model ion channel slightly increases the overall order parameter profile in the l(o)+l(d) two-phase coexistence region, probably by selectively partitioning into l(d) domains, does not change the overall phase behavior, however. This behavior is in contrast to the effect of the peptide incorporation into simple, one-component phospholipid bilayer systems.
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Affiliation(s)
- Nagarajan Periasamy
- University of Dortmund, Physical Chemistry I-Biophysical Chemistry, D-44227 Dortmund, Germany
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CHAUVIN M, LEE S, CHANG S, GRAY P, KANG D, SWANSON B. ULTRA HIGH PRESSURE INACTIVATION OF SACCHAROMYCES CEREVISIAE AND LISTERIA INNOCUA ON APPLES AND BLUEBERRIES. J FOOD PROCESS PRES 2005. [DOI: 10.1111/j.1745-4549.2005.00038.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Franzon R, Chiarani F, Mendes RH, Belló-Klein A, Wyse ATS. Dietary soy prevents brain Na+, K(+)-ATPase reduction in streptozotocin diabetic rats. Diabetes Res Clin Pract 2005; 69:107-12. [PMID: 16005358 DOI: 10.1016/j.diabres.2004.11.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2004] [Accepted: 11/15/2004] [Indexed: 02/02/2023]
Abstract
The aim of this study was to investigate Na+, K(+)-ATPase activity in cerebral cortex, hippocampus and hypothalamus of diabetic rats. The action of dietary soy protein on the effect produced by diabetes on this activity was also tested. Forty-nine-day-old Wistar were divided into two groups: diabetes streptozotocin (50 mg/kg body weight) and control (citrate solution). Rats were sacrificed 56 days later. In other set of experiments, rats received a dietary with casein (control) from day 21 to the 49 of postnatal-age and were subjected to diabetes or received citrate (control). One week later, rats received a special dietary with soy protein with isoflavones or casein (control) from day 56 to the 105 of postnatal-age. Results showed that diabetic rats presented a reduction ( approximately 40%) of Na+, K(+)-ATPase activity in all structures studied. Pretreatment with soy protein prevented the inhibitory effects of diabetes on the enzyme activity. Assuming the possibility that these effects might also occur in the human condition, our findings may be relevant to explain, at least in part, the neurologic dysfunction associated with diabetes and might support a novel therapeutic strategy (soy protein) to slow the progression of neurodegeneration in this disorder.
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Affiliation(s)
- Renata Franzon
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP 90035-003 Porto Alegre, RS, Brazil
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Liu M, Brusilow WSA, Needleman R. Activity of the yeast Tat2p tryptophan permease is sensitive to the anti-tumor agent 4-phenylbutyrate. Curr Genet 2004; 46:256-68. [PMID: 15490173 DOI: 10.1007/s00294-004-0531-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
4-Phenylbutyrate (PB) induces differentiation and is being intensively studied as a treatment for brain, prostate, breast, and hematopoietic cancer. While many different primary targets for PB have been proposed, the mechanism by which it causes cellular differentiation remains unknown. To identify the primary cellular target, we investigated its effects on Saccharomyces cerevisiae and showed that it inhibits tryptophan transport. We show here that PB and sorbic acid induce an ubiquitin-dependent turnover of the tryptophan permease Tat2p. However, the inhibition of transport is not a consequence of the loss of Tat2p, since it also occurs when turnover is prevented by deleting the Tat2p ubiquitination sites. When we tested the effects of PB and other growth inhibitory agents on the growth of amino acid auxotrophs, we found that several auxotrophs are hypersensitive to a number of chemically unrelated agents, including PB and some, but not all, weak acids; and this sensitivity is due to the inhibition of amino acid transport. For the inhibitory weak acids, inhibition is not confined to aromatic amino acid auxotrophs, nor is it a general weak acid stress response, since the degree of inhibition is independent of weak acid hydrophobicity and p Ka. Our results show that diverse agents affect the activity of the Tat2p permease rather than its stability and suggest the hypothesis that the anti-neoplastic action of PB is due to a decrease in the activity of surface receptors or other membrane proteins needed to maintain the transformed state.
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Affiliation(s)
- Ming Liu
- Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine, 540 E. Canfield Ave, Detroit, MI 48201, USA
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36
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Abe F, Iida H. Pressure-induced differential regulation of the two tryptophan permeases Tat1 and Tat2 by ubiquitin ligase Rsp5 and its binding proteins, Bul1 and Bul2. Mol Cell Biol 2003; 23:7566-84. [PMID: 14560004 PMCID: PMC207609 DOI: 10.1128/mcb.23.21.7566-7584.2003] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2003] [Revised: 06/06/2003] [Accepted: 07/28/2003] [Indexed: 11/20/2022] Open
Abstract
Tryptophan uptake appears to be the Achilles' heel in yeast physiology, since under a variety of seemingly diverse toxic conditions, it becomes the limiting factor for cell growth. When growing cells of Saccharomyces cerevisiae are subjected to high hydrostatic pressure, tryptophan uptake is down-regulated, leading to cell cycle arrest in the G(1) phase. Here we present evidence that the two tryptophan permeases Tat1 and Tat2 are differentially regulated by Rsp5 ubiquitin ligase in response to high hydrostatic pressure. Analysis of high-pressure growth mutants revealed that the HPG1 gene was allelic to RSP5. The HPG1 mutation or the bul1Delta bul2Delta double mutation caused a marked increase in the steady-state level of Tat2 but not of Tat1, although both permeases were degraded at high pressure in an Rsp5-dependent manner. There were marked differences in subcellular localization. Tat1 localized predominantly in the plasma membrane, whereas Tat2 was abundant in the internal membranes. Moreover, Tat1 was associated with lipid rafts, whereas Tat2 localized in bulk lipids. Surprisingly, Tat2 became associated with lipid rafts upon the occurrence of a ubiquitination defect. These results suggest that ubiquitination is an important determinant of the localization and regulation of these tryptophan permeases. Determination of the activation volume (DeltaV( not equal )) for Tat1- and Tat2-mediated tryptophan uptake (89.3 and 50.8 ml/mol, respectively) revealed that both permeases are highly sensitive to membrane perturbation and that Tat1 rather than Tat2 is likely to undergo a dramatic conformational change during tryptophan import. We suggest that hydrostatic pressure is a unique tool for elucidating the dynamics of integral membrane protein functions as well as for probing lipid microenvironments where they localize.
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Affiliation(s)
- Fumiyoshi Abe
- The DEEPSTAR Group, Japan Marine Science and Technology Center (JAMSTEC), Yokosuka 237-0061, Japan.
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Da Silveira MG, Golovina EA, Hoekstra FA, Rombouts FM, Abee T. Membrane fluidity adjustments in ethanol-stressed Oenococcus oeni cells. Appl Environ Microbiol 2003; 69:5826-32. [PMID: 14532031 PMCID: PMC201238 DOI: 10.1128/aem.69.10.5826-5832.2003] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2003] [Accepted: 07/28/2003] [Indexed: 11/20/2022] Open
Abstract
The effect of ethanol on the cytoplasmic membrane of Oenococcus oeni cells and the role of membrane changes in the acquired tolerance to ethanol were investigated. Membrane tolerance to ethanol was defined as the resistance to ethanol-induced leakage of preloaded carboxyfluorescein (cF) from cells. To probe the fluidity of the cytoplasmic membrane, intact cells were labeled with doxyl-stearic acids and analyzed by electron spin resonance spectroscopy. Although the effect of ethanol was noticeable across the width of the membrane, we focused on fluidity changes at the lipid-water interface. Fluidity increased with increasing concentrations of ethanol. Cells responded to growth in the presence of 8% (vol/vol) ethanol by decreasing fluidity. Upon exposure to a range of ethanol concentrations, these adapted cells had reduced fluidity and cF leakage compared with cells grown in the absence of ethanol. Analysis of the membrane composition revealed an increase in the degree of fatty acid unsaturation and a decrease in the total amount of lipids in the cells grown in the presence of 8% (vol/vol) ethanol. Preexposure for 2 h to 12% (vol/vol) ethanol also reduced membrane fluidity and cF leakage. This short-term adaptation was not prevented in the presence of chloramphenicol, suggesting that de novo protein synthesis was not involved. We found a strong correlation between fluidity and cF leakage for all treatments and alcohol concentrations tested. We propose that the protective effect of growth in the presence of ethanol is, to a large extent, based on modification of the physicochemical state of the membrane, i.e., cells adjust their membrane permeability by decreasing fluidity at the lipid-water interface.
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Affiliation(s)
- M Graça Da Silveira
- Wageningen University and Research Center, 6700 EV Wageningen, The Netherlands
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38
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Affiliation(s)
- Antonio D Molina-García
- Department of Engineering, Instituto del Frío, C.S.I.C., José Antonio Novais, 10, Ciudad Universitaria, 28040 Madrid, Spain.
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Yun I, Cho ES, Jang HO, Kim UK, Choi CH, Chung IK, Kim IS, Wood WG. Amphiphilic effects of local anesthetics on rotational mobility in neuronal and model membranes. BIOCHIMICA ET BIOPHYSICA ACTA 2002; 1564:123-32. [PMID: 12101004 DOI: 10.1016/s0005-2736(02)00409-1] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
To provide a basis for studying the molecular mechanism of pharmacological action of local anesthetics, we carried out a study of the membrane actions of tetracaine, bupivacaine, lidocaine, prilocaine and procaine. Fluorescence polarization of 12-(9-anthroyloxy)stearic acid (12-AS) and 2-(9-anthroyloxy)stearic acid (2-AS) were used to examine the effects of local anesthetics on differential rotational mobility between polar region and hydrocarbon interior of synaptosomal plasma membrane vesicles (SPMV) isolated from bovine cerebral cortex, and liposomes of total lipids (SPMVTL) and phospholipids (SPMVPL) extracted from the SPMV. The two membrane components differed with respect to 2 and 12 anthroyloxy stearate (2-AS, 12-AS) probes, indicating that a difference in the membrane fluidity may be present. In a dose-dependent manner, tetracaine, bupivacaine, lidocaine, prilocaine and procaine decreased anisotropy of 12-AS in the hydrocarbon interior of the SPMV, SPMVTL and SPMVPL, but tetracaine, bupivacaine, lidocaine and prilocaine increased anisotropy of 2-AS in the membrane interface. These results indicate that local anesthetics have significant disordering effects on hydrocarbon interior of the SPMV, SPMVTL and SPMVPL, but have significant ordering effects on the membrane interface, and thus they could affect the transport of Na(+) and K(+) in nerve membranes, leading to anesthetic action.
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Affiliation(s)
- Il Yun
- Department of Dental Pharmacology and Biophysics, College of Dentistry and Research Institute for Oral Biotechnology, Pusan National University, South Korea.
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Wan FY, Wang YN, Zhang GJ. Influence of the physical states of membrane surface area and center area on lysosomal proton permeability. Arch Biochem Biophys 2002; 404:285-92. [PMID: 12147267 DOI: 10.1016/s0003-9861(02)00280-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The physical state of the lysosomal membrane was modulated with the membrane fluidizers n-propanol and n-octanol and with the membrane rigidifiers cholesteryl hemisuccinate and cholesterol. Membrane fluidity was examined by the steady-state fluorescence anisotropy of 2-(9-anthroyloxy) palmitic acid and 16-(9-anthroyloxy) palmitic acid. Fluidizing the membranes at the surface and center areas increased the proton permeability coefficient by 92.8 and 18.0%, respectively. Rigidifying the membranes at the surface and center areas decreased the coefficient by 68.2 and 40.2%, respectively. Proton leakage of the lysosomes increased and decreased similar to the coefficient changes with the treatments. The results indicate that lysosomal proton permeability is affected by its membrane's physical state, and the physical state of the membrane surface area affects the proton permeability more markedly. The proton permeability coefficient of liposomes was similar to that of lysosomes, suggesting that efflux of lysosomal protons might occur through the lipid part of the bilayer but not transmembrane proteins.
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Affiliation(s)
- Feng-Yi Wan
- Center for Molecular Biology, Institute of Biophysics, Academia Sinica, Beijing 100101, People's Republic of China
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Ulmer HM, Herberhold H, Fahsel S, Gänzle MG, Winter R, Vogel RF. Effects of pressure-induced membrane phase transitions on inactivation of HorA, an ATP-dependent multidrug resistance transporter, in Lactobacillus plantarum. Appl Environ Microbiol 2002; 68:1088-95. [PMID: 11872454 PMCID: PMC123735 DOI: 10.1128/aem.68.3.1088-1095.2002] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The effects of pressure on cultures of Lactobacillus plantarum were characterized by determination of the viability and activity of HorA, an ATP-binding cassette multidrug resistance transporter. Changes in the membrane composition of L. plantarum induced by different growth temperatures were determined. Furthermore, the effect of the growth temperature of a culture on pressure inactivation at 200 MPa was determined. Cells were characterized by plate counts on selective and nonselective agar after pressure treatment, and HorA activity was measured by ethidium bromide efflux. Fourier transform-infrared spectroscopy and Laurdan fluorescence spectroscopy provided information about the thermodynamic phase state of the cytoplasmic membrane during pressure treatment. A pressure-temperature diagram for cell membranes was established. Cells grown at 37 degrees C and pressure treated at 15 degrees C lost >99% of HorA activity and viable cell counts within 36 and 120 min, respectively. The membranes of these cells were in the gel phase region at ambient pressure. In contrast, cells grown at 15 degrees C and pressure treated at 37 degrees C lost >99% of HorA activity and viable cell counts within 4 and 8 min, respectively. The membranes of these cells were in the liquid crystalline phase region at ambient pressure. The kinetic analysis of inactivation of L. plantarum provided further evidence that inactivation of HorA is a crucial step during pressure-induced cell death. Comparison of the biological findings and the membrane state during pressure treatment led to the conclusion that the inactivation of cells and membrane enzymes strongly depends on the thermodynamic properties of the membrane. Pressure treatment of cells with a liquid crystalline membrane at 0.1 MPa resulted in HorA inactivation and cell death more rapid than those of cells with a gel phase membrane at 0.1 MPa.
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Affiliation(s)
- H M Ulmer
- Lehrstuhl für Technische Mikrobiologie, Weihenstephaner Steig 16, TU München, D-85350 Freising, Germany
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Kato M, Hayashi R, Tsuda T, Taniguchi K. High pressure-induced changes of biological membrane. Study on the membrane-bound Na(+)/K(+)-ATPase as a model system. EUROPEAN JOURNAL OF BIOCHEMISTRY 2002; 269:110-8. [PMID: 11784304 DOI: 10.1046/j.0014-2956.2002.02621.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In order to study the pressure-induced changes of biological membrane, hydrostatic pressures of from 0.1 to 400 MPa were applied to membrane-bound Na(+)/K(+)-ATPase from pig kidney as a model system of protein and lipid membrane. The activity showed at least a three-step change induced by pressures of 0.1-100 MPa, 100-220 MPa, and 220 MPa or higher. At pressures of 100 MPa or lower a decrease in the fluidity of lipid bilayer and a reversible conformational change in transmembrane protein is induced, leading to the functional disorder of membrane-associated ATPase activity. A pressure of 100-220 MPa causes a reversible phase transition in parts of the lipid bilayer from the liquid crystalline to the gel phase and the dissociation of and/or conformational changes in the protein subunits. These changes could cause a separation of the interface between alpha and beta subunits and between protein and the lipid bilayer to create transmembrane tunnels at the interface. Tunnels would be filled with water from the aqueous environment and take up tritiated water. A pressure of 220 MPa or higher irreversibly destroys and fragments the gross membrane structure, due to protein unfolding and interface separation, which is amplified by the increased pressure. These findings provide an explanation for the high pressure-induced membrane-damage to subcellular organelles.
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Affiliation(s)
- Michiko Kato
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Japan.
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43
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Gorini A, Canosi U, Devecchi E, Geroldi D, Villa RF. ATPases enzyme activities during ageing in different types of somatic and synaptic plasma membranes from rat frontal cerebral cortex. Prog Neuropsychopharmacol Biol Psychiatry 2002; 26:81-90. [PMID: 11853124 DOI: 10.1016/s0278-5846(01)00233-0] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The catalytic properties of energy-utilizing ATPases enzyme systems related to ions homeostasis were evaluated in different types of synaptic plasma membranes (SPM) and in somatic plasma membranes (SM) from cerebral cortex of rats aged 5, 10, and 22 months. The following enzymes were evaluated: Na+, K+-ATPase, Ca2+, Mg2+-ATPase, Mg2+-ATPase and the activity of acetylcholine esterase (AChE) was also evaluated. The ATPases located on SM and SPM and synaptic vesicles are involved in the regulation of presynaptic nerve ending homeostasis and postsynaptic activities. Different types of SM and SPM (three types) were obtained by combinations of differential and density gradient ultracentrifugation techniques in sucrose-Ficoll media: the first was obtained by purification of the sediment of mitochondrial supernate and the second after synaptosomal lysis and purification on density gradient. In the cerebral cortex of 5-month-old rats, the catalytic properties of ATPases systems markedly differ according to the different types of SPM and SM, thus indicating that the metabolic role of each ATPase is determined by their subcellular in vivo localization. As regards ageing: (i) ATPase enzyme catalytic activities tend to decrease during ageing in a complex way; (ii) ageing induced specific modifications in individual ATPases according to their subsynaptic localization; and (iii) these effects are probably due to specific biochemical situations that take place at each age, reflecting the bioenergetic state of the cerebral tissue with respect to the energy demand. The cerebral concentration and content of SM proteins were increased by ageing suggesting that many defective noncatalytic proteins may be formed during ageing, as shown by immunoblotting techniques.
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Affiliation(s)
- Antonella Gorini
- Department of Physiological, Pharmacological, and Cellular-Molecular Sciences, University of Pavia, Italy
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44
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Kessel A, Musafia B, Ben-Tal N. Continuum solvent model studies of the interactions of an anticonvulsant drug with a lipid bilayer. Biophys J 2001; 80:2536-45. [PMID: 11371432 PMCID: PMC1301443 DOI: 10.1016/s0006-3495(01)76225-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Valproic acid (VPA) is a short, branched fatty acid with broad-spectrum anticonvulsant activity. It has been suggested that VPA acts directly on the plasma membrane. We calculated the free energy of interaction of VPA with a model lipid bilayer using simulated annealing and the continuum solvent model. Our calculations indicate that VPA is likely to partition into the bilayer both in its neutral and charged forms, as expected from such an amphipathic molecule. The calculations also show that VPA may migrate (flip-flop) across the membrane; according to our (theoretical) study, the most likely flip-flop path at neutral pH involves protonation of VPA pending its insertion into the lipid bilayer and deprotonation upon departure from the other side of the bilayer. Recently, the flip-flop of long fatty acids across lipid bilayers was studied using fluorescence and NMR spectroscopies. However, the measured value of the flip-flop rate appears to depend on the method used in these studies. Our calculated value of the flip-flop rate constant, 20/s, agrees with some of these studies. The limitations of the model and the implications of the study for VPA and other fatty acids are discussed.
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Affiliation(s)
- A Kessel
- Department of Biochemistry, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv 69978 Israel
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45
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Téllez-Luis SJ, Ramírez JA, Pérez-Lamela C, Vázquez M, Simal-Gándara J. APLICACIÓN DE LA ALTA PRESIÓN HIDROSTÁTICA EN LA CONSERVACIÓN DE LOS ALIMENTOS APPLICATION OF HIGH HYDROSTATIC PRESSURE IN THE FOOD PRESERVATION APLICACIÓN DA ALTA PRESIÓN HIDROSTÁTICA NA CONSERVACIÓN DOS ALIMENTOS. ACTA ACUST UNITED AC 2001. [DOI: 10.1080/11358120109487649] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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46
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Mentré P, Hui Bon Hoa G. Effects of high hydrostatic pressures on living cells: a consequence of the properties of macromolecules and macromolecule-associated water. INTERNATIONAL REVIEW OF CYTOLOGY 2001; 201:1-84. [PMID: 11057830 DOI: 10.1016/s0074-7696(01)01001-4] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Sixty percent of the Earth's biomass is found in the sea, at depths greater than 1000 m, i.e., at hydrostatic pressures higher than 100 atm. Still more surprising is the fact that living cells can reversibly withstand pressure shifts of 1000 atm. One explanation lies in the properties of cellular water. Water forms a very thin film around macromolecules, with a heterogeneous structure that is an image of the heterogeneity of the macromolecular surface. The density of water in contact with macromolecules reflects the physical properties of their different domains. Therefore, any macromolecular shape variations involving the reorganization of water and concomitant density changes are sensitive to pressure (Le Chatelier's principle). Most of the pressure-induced changes to macromolecules are reversible up to 2000 atm. Both the effects of pressure shifts on living cells and the characteristics of pressure-adapted species are opening new perspectives on fundamental problems such as regulation and adaptation.
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Affiliation(s)
- P Mentré
- Station INRA 806, Institut de Biologie Physico-Chimique, Paris, France
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47
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Waczulíková I, Sikurová L, Bryszewska M, R kawiecka K, Cársky J, Ulicná O. Impaired erythrocyte transmembrane potential in diabetes mellitus and its possible improvement by resorcylidene aminoguanidine. Bioelectrochemistry 2000; 52:251-6. [PMID: 11129249 DOI: 10.1016/s0302-4598(00)00107-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Erythrocytes of diabetic patients have abnormal membrane properties. We examined in vitro transmembrane potential and the possible effect of resorcylidene aminoguanidine (RAG) on its modulation in erythrocytes of diabetic subjects. The transmembrane potential was assessed in RAG-treated and untreated erythrocytes, respectively, using a fluorescent dye (3,3'-dipropylthiadicarbocyanine iodide [DiSC3(5)]). We confirmed earlier findings that the transmembrane potential of diabetic erythrocytes is significantly increased compared with control (P < 0.01). The membrane hyperpolarization found in diabetic cells seems to be a result of oxidative stress present in diabetes mellitus. On one hand, the RAG treatment induced decrease in abnormal transmembrane potential values in diabetic erythrocytes (P < 0.01), presumably via its antioxidant and antiglycation activity. On the other hand, RAG moderately hyperpolarized the control erythrocytes (P < 0.05). We suggest that the drug-induced transient membrane expansion leads to an intracellular potassium loss and a subsequent change of the transmembrane potential. However, if controlled by an appropriate dosage, RAG can eliminate certain types of erythrocyte membrane damage induced by diabetes mellitus.
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Affiliation(s)
- I Waczulíková
- Department of Biophysics and Chemical Physics, Faculty of Mathematics and Physics, Comenius University, Bratislava, Slovak Republic.
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48
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Esmann M, Fedosova NU, Maunsbach AB. Protonation-dependent inactivation of Na,K-ATPase by hydrostatic pressure developed at high-speed centrifugation. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1468:320-8. [PMID: 11018676 DOI: 10.1016/s0005-2736(00)00274-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Irreversible inactivation of membranous Na,K-ATPase by high-speed centrifugation in dilute aqueous solutions depends markedly on the protonation state of the protein. Pig kidney Na,K-ATPase is irreversibly inactivated at pH 5 but is fully protected at pH 7 and above. Shark rectal gland Na,K-ATPase is irreversibly inactivated at neutral or acidic pH and partially protected at an alkaline pH. The overall Na,K-ATPase activity and the K-dependent pNPPase activity were denatured in parallel. Cryoprotectants such as glycerol or sucrose at concentrations of 25-30% fully protect both enzymes against inactivation. The specific ligands NaCl and KCl protect the Na,K-ATPase activity partially and the pNPPase activity fully at concentrations of 0.2-0.3 M. Electron microscope analysis of the centrifuged Na,K-ATPase membranes revealed that the ultrastructure of the native membranes is preserved upon inactivation. It was also observed that the sarcoplasmic reticulum Ca-ATPase and hog gastric H, K-ATPase are susceptible to inactivation by high-speed centrifugation in a pH-dependent fashion. H,K-ATPase is protected at alkaline pH, whereas Ca-ATPase is protected only in the neutral pH range.
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Affiliation(s)
- M Esmann
- Department of Biophysics, University of Aarhus, Ole Worms Alle 185, DK-8000 Aarhus C, Denmark.
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49
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Ulmer HM, Gänzle MG, Vogel RF. Effects of high pressure on survival and metabolic activity of Lactobacillus plantarum TMW1.460. Appl Environ Microbiol 2000; 66:3966-73. [PMID: 10966416 PMCID: PMC92246 DOI: 10.1128/aem.66.9.3966-3973.2000] [Citation(s) in RCA: 109] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2000] [Accepted: 06/30/2000] [Indexed: 12/27/2022] Open
Abstract
The application of high pressure (HP) for food preservation requires insight into mechanisms of HP-mediated cell injury and death. The HP inactivation in model beer of Lactobacillus plantarum TMW1.460, a beer-spoiling organism, was investigated at pressures ranging from 200 to 600 MPa. Surviving cells were characterized by determination of (i) cell viability and sublethal injury, (ii) membrane permeability to the fluorescent dyes propidium iodide (PI) and ethidium bromide (EB), (iii) metabolic activity with tetrazolium salts, and (iv) the activity of HorA, an ATP binding cassette-type multidrug resistance transporter conferring resistance to hop compounds. HP inactivation curves exhibited a shoulder, an exponential inactivation phase, and pronounced tailing caused by a barotolerant fraction of the population, about 1 in 10(6) cells. During exponential inactivation, more than 99.99% of cells were sublethally injured; however, no sublethal injury was detected in the barotolerant fraction of the culture. Sublethally injured cells were metabolically active, and loss of metabolic activity corresponded to the decrease of cell viability. Membrane damage measured by PI uptake occurred later than cell death, indicating that dye exclusion may be used as a fail-safe method for preliminary characterization of HP inactivation. An increase of membrane permeability to EB and a reduction of HorA activity were observed prior to the loss of cell viability, indicating loss of hop resistance of pressurized cells. Even mild HP treatments thus abolished the ability of cells to survive under adverse conditions.
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Affiliation(s)
- H M Ulmer
- Technische Universität München, Lehrstuhl für Technische Mikrobiologie, D-85350 Freising, Germany
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Natesan S, Madhavarao CN, Sitaramam V. The positive role of voids in the plasma membrane in growth and energetics of Escherichia coli. Biophys Chem 2000; 85:59-78. [PMID: 10885399 DOI: 10.1016/s0301-4622(00)00145-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bacterial respiration, endogenous as well as induced respiration by glucose, lactose and glycine betaine, was found to be sensitive to external solute concentration. Permeability of hydrogen peroxide, a non-electrolyte of molecular size between water and urea, through the bacterial membranes changed directly with the rate of respiration (an activity residing in the bacterial plasma membrane) in E. coli and the enhanced permeability and respiratory activity were highly correlated. Hydrogen peroxide permeability and induction of voids (spaces in the matrix of the bilayer into which hydrophobic fluorescent probes partition, which in turn were used to assess the modulation of these cavities) were shown to be a direct and excellent measure of leak conductance. Fluorescence intensity and anisotropy of the extrinsic fluorescent probes (incorporated by growing bacteria in their presence) decreased with increased respiration in bacteria, consistent with lowered molecular restriction and enhanced hydration in the membrane phase for these probes as seen in dimyristoylphosphatidylcholine bilayers due to phase transition. The physical basis of osmotic phenomena, as a relevant (thermodynamic) volume, could relate to water exchange or compression, depending on the osmotic domain. In the domain of compression in bacteria, i.e. well above the isotonic range, the computed activation volume was consistent with voids in the membrane. This study emphasises a major role of leak conductance in bacterial physiology and growth.
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Affiliation(s)
- S Natesan
- Department of Biotechnology, University of Pune, India
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