1
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Effect of the addition of antifreeze protein type I on the quality of post-thawed domestic cat epididymal sperm. ZYGOTE 2023; 31:240-245. [PMID: 36919856 DOI: 10.1017/s0967199422000521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Abstract
Cryopreservation of domestic cat semen is mainly performed as a model for the establishment of endangered wild feline protocols. The supplementation of antifreeze protein type I (AFP I) to cryopreservation medium has shown improvement in frozen-thawed sperm quality in other species, but its effect on cat semen has not yet been tested. This study aimed to assess the addition of AFP I to cryopreservation medium in domestic cats. Sperm was obtained from the cauda epididymis of orchiectomized cats; sperm was then pooled in Tris buffer and allocated into three treatments, according to AFP I final concentration: 0 (control), 0.1, and 0.5 µg/ml. Nine replicates were cryopreserved in a two-step protocol and subsequently thawed at 37°C for 30 s. There was no difference (P > 0.05) among the control, 0.1 and 0.5 µg/ml groups for parameters such as motility, vitality, functional membrane integrity, mature chromatin, normal morphology, and sperm binding to egg perivitelline membrane. In the 0.5 μg/ml group only, percentages of live sperm with intact acrosome and of sperm with most inactive mitochondria (DAB III) showed a significant reduction, along with a tendency (P = 0.053) to an increase in the percentage of sperm with most active mitochondria (DAB II). In conclusion, the supplementation of 0.1 and 0.5 µg/ml of AFP I did not promote consistent beneficial effects on the overall sperm cryotolerance in domestic cats.
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2
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Jevtić P, Elliott KW, Watkins SE, Sreter JA, Jovic K, Lehner IB, Baures PW, Tsavalas JG, Levy DL, Varga K. An insect antifreeze protein from Anatolica polita enhances the cryoprotection of Xenopus laevis eggs and embryos. J Exp Biol 2022; 225:jeb243662. [PMID: 35014670 PMCID: PMC8920033 DOI: 10.1242/jeb.243662] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 01/06/2022] [Indexed: 10/19/2022]
Abstract
Cryoprotection is of interest in many fields of research, necessitating a greater understanding of different cryoprotective agents. Antifreeze proteins have been identified that have the ability to confer cryoprotection in certain organisms. Antifreeze proteins are an evolutionary adaptation that contributes to the freeze resistance of certain fish, insects, bacteria and plants. These proteins adsorb to an ice crystal's surface and restrict its growth within a certain temperature range. We investigated the ability of an antifreeze protein from the desert beetle Anatolica polita, ApAFP752, to confer cryoprotection in the frog Xenopus laevis. Xenopus laevis eggs and embryos microinjected with ApAFP752 exhibited reduced damage and increased survival after a freeze-thaw cycle in a concentration-dependent manner. We also demonstrate that ApAFP752 localizes to the plasma membrane in eggs and embryonic blastomeres and is not toxic for early development. These studies show the potential of an insect antifreeze protein to confer cryoprotection in amphibian eggs and embryos.
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Affiliation(s)
- Predrag Jevtić
- Department of Molecular Biology, University of Wyoming, Laramie, WY 82071, USA
| | - K. Wade Elliott
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH 03824, USA
| | - Shelby E. Watkins
- Department of Chemistry, University of Wyoming, Laramie, WY 82071, USA
| | - Jonathan A. Sreter
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH 03824, USA
| | - Katarina Jovic
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH 03824, USA
| | - Ian B. Lehner
- Department of Chemistry, Keene State College, Keene, NH 03435, USA
| | - Paul W. Baures
- Department of Chemistry, Keene State College, Keene, NH 03435, USA
| | - John G. Tsavalas
- Department of Chemistry, University of New Hampshire, Durham, NH 03824, USA
| | - Daniel L. Levy
- Department of Molecular Biology, University of Wyoming, Laramie, WY 82071, USA
| | - Krisztina Varga
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH 03824, USA
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3
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Sarkar A, Namboodiri V, Enderlein J, Kumbhakar M. Picosecond to Second Fluorescence Correlation Spectroscopy for Studying Solute Exchange and Quenching Dynamics in Micellar Media. J Phys Chem Lett 2021; 12:7641-7649. [PMID: 34351151 DOI: 10.1021/acs.jpclett.1c02021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Numerous studies have been devoted to understand the reaction kinetics in micelles, where the accessible kinetic time window is often limited by the dynamic range of the employed spectroscopic technique. This is usually accompanied by a selection of probes that comfortably explore time scales where slow solute exchange kinetics is negligible, as compared to the fast excited state reactions. This has led to an undervaluation of the role played by dynamic partitioning of hydrophilic solutes in microheterogeneous media. Here, we employ fluorescence correlation spectroscopy (FCS) and the zwitterionic dye Rhodamine 110 to quantitatively explore the impact of solute exchange on the photoinduced electron transfer between this dye and N,N-dimethylaniline in micellar media. Our study elucidates the coupling and interplay between the kinetics of photophysics, quenching, and solute exchange through a quantitative unified molecular-state quenching-kinetic model that describes the steady-state ensemble and FCS data from subnanosecond photon antibunching to millisecond diffusions.
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Affiliation(s)
- Aranyak Sarkar
- Radiation and Photochemistry Division, Bhabha Atomic Research Center, Mumbai 400085, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
| | - Vinu Namboodiri
- Radiation and Photochemistry Division, Bhabha Atomic Research Center, Mumbai 400085, India
| | - Jörg Enderlein
- III. Institute of Physics-Biophysics, Georg August University, 37077 Göttingen, Germany
| | - Manoj Kumbhakar
- Radiation and Photochemistry Division, Bhabha Atomic Research Center, Mumbai 400085, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
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4
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Evans ER, Farnoud AM, O'Brien KM, Crockett EL. Thermal profiles reveal stark contrasts in properties of biological membranes from heart among Antarctic notothenioid fishes which vary in expression of hemoglobin and myoglobin. Comp Biochem Physiol B Biochem Mol Biol 2020; 252:110539. [PMID: 33242660 DOI: 10.1016/j.cbpb.2020.110539] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 11/13/2020] [Accepted: 11/19/2020] [Indexed: 01/24/2023]
Abstract
Antarctic notothenioids are noted for extreme stenothermy, yet underpinnings of their thermal limits are not fully understood. We hypothesized that properties of ventricular membranes could explain previously observed differences among notothenioids in temperature onset of cardiac arrhythmias and persistent asystole. Microsomes were prepared using ventricles from six species of notothenioids, including four species from the hemoglobin-less (Hb-) family Channichthyidae (icefishes), which also differentially express cardiac myoglobin (Mb), and two species from the (Hb+) Nototheniidae. We determined membrane fluidity and structural integrity by quantifying fluorescence depolarization of 1,6-diphenyl-1,3,5-hexatriene (DPH) and leakage of 5(6)-carboxyfluorescein, respectively, over a temperature range from ambient (0 °C) to 20 °C. Compositions of membrane phospholipids and cholesterol contents were also quantified. Membranes from all four species of icefishes exhibited greater fluidity than membranes from the red-blooded species N. coriiceps. Thermal sensitivity of fluidity did not vary among species. The greatest thermal sensitivity to leakage occurred between 0 and 5 °C for all species, while membranes from the icefish, Chaenocephalus aceratus (Hb-/Mb-) displayed leakage that was nearly 1.5-fold greater than leakage in N. coriiceps (Hb+/Mb+). Contents of phosphatidylethanolamine (PE) were approximately 1.5-fold greater in icefishes than in red-blooded fishes, and phospholipids had a higher degree of unsaturation in icefishes than in Hb + notothenioids. Cholesterol contents were lowest in Champsocephalus gunnari (Hb-/Mb-) and highest in the two Hb+/Mb + species, G. gibberifrons and N. coriiceps. Our results reveal marked differences in membrane properties and indicate a breach in membrane fluidity and structural integrity at a lower temperature in icefishes than in red-blooded notothenioids.
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Affiliation(s)
- Elizabeth R Evans
- Department of Biological Sciences, Ohio University, Athens, OH 45701, USA
| | - Amir M Farnoud
- Department of Chemical and Biomolecular Engineering, Ohio University, Athens, OH 45701, USA
| | - Kristin M O'Brien
- Institute of Arctic Biology, University of Alaska, Fairbanks, AK 99775, USA
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5
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Dong X, Liu Z, Mi W, Xu C, Xu M, Zhou Y, Zhen G, Cao X, Fang X, Mi C. Overexpression of BrAFP1 gene from winter rapeseed (Brassica rapa) confers cold tolerance in Arabidopsis. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 155:338-345. [PMID: 32798902 DOI: 10.1016/j.plaphy.2020.07.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 07/06/2020] [Accepted: 07/06/2020] [Indexed: 06/11/2023]
Abstract
Antifreeze proteins (AFPs) can bind to ice crystals and restrain the formation of larger crystals, a strategy vital to the survival of plants in freezing environments. The BrAFP1 from winter rapeseed cultivars 'Longyou 7' with high cold tolerance was cloned and overexpressed in Arabidopsis. BrAFP1 was localized in the cytoplasm and nucleus. Under cold stress, SOD activity and free proline content were higher, MDA content and relative conductivity were lower in transgenic lines than those in wide-type Arabidopsis. Frostbite of transgenic plants was minimized, whereas frostbite of the Arabidopsis afp1 mutant was severe. Transition of the amino acid at position 17 of BrAFP1 was related to the increased winter survival of the rapeseed cultivar. Cultivars with higher survival rates had a predilection for tyrosine, not tryptophan, at the 17th site in the amino sequence of BrAFP1. Transcription of BrAFP1 was induced more rapidly, and the expression of the gene was also higher, in Longyou 7 than that in Tianyou 4 under cold stress. Overall, the high expression of BrAPF1 confers more cold-tolerance in Longyou 7.
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Affiliation(s)
- Xiaoyun Dong
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China
| | - Zigang Liu
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China.
| | - Wenbo Mi
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China
| | - Chunmei Xu
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China
| | - Minxia Xu
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China
| | - Ya Zhou
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China
| | - Guoqiang Zhen
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China
| | - Xiaodong Cao
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China
| | - Xinlin Fang
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China
| | - Chao Mi
- Gansu Provincial Key Laboratory of AridLand Crop Sciences, College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China
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Schwidetzky R, Kunert AT, Bonn M, Pöschl U, Ramløv H, DeVries AL, Fröhlich-Nowoisky J, Meister K. Inhibition of Bacterial Ice Nucleators Is Not an Intrinsic Property of Antifreeze Proteins. J Phys Chem B 2020; 124:4889-4895. [PMID: 32437152 DOI: 10.1021/acs.jpcb.0c03001] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Cold-adapted organisms use antifreeze proteins (AFPs) or ice-nucleating proteins (INPs) for the survival in freezing habitats. AFPs have been reported to be able to inhibit the activity of INPs, a property that would be of great physiological relevance. The generality of this effect is not understood, and for the few known examples of INP inhibition by AFPs, the molecular mechanisms remain unclear. Here, we report a comprehensive evaluation of the effects of five different AFPs on the activity of bacterial ice nucleators using a high-throughput ice nucleation assay. We find that bacterial INPs are inhibited by certain AFPs, while others show no effect. Thus, the ability to inhibit the activity of INPs is not an intrinsic property of AFPs, and the interactions of INPs and different AFPs proceed through protein-specific rather than universal molecular mechanisms.
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Affiliation(s)
| | - Anna T Kunert
- Max Planck Institute for Chemistry, 55128 Mainz, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Ulrich Pöschl
- Max Planck Institute for Chemistry, 55128 Mainz, Germany
| | | | - Arthur L DeVries
- University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | | | - Konrad Meister
- Max Planck Institute for Polymer Research, 55128 Mainz, Germany.,University of Alaska Southeast, Juneau, Alaska 99801, United States
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7
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Xiang H, Yang X, Ke L, Hu Y. The properties, biotechnologies, and applications of antifreeze proteins. Int J Biol Macromol 2020; 153:661-675. [PMID: 32156540 DOI: 10.1016/j.ijbiomac.2020.03.040] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 03/04/2020] [Accepted: 03/06/2020] [Indexed: 01/30/2023]
Abstract
By natural selection, organisms evolve different solutions to cope with extremely cold weather. The emergence of an antifreeze protein gene is one of the most momentous solutions. Antifreeze proteins possess an importantly functional ability for organisms to survive in cold environments and are widely found in various cold-tolerant species. In this review, we summarize the origin of antifreeze proteins, describe the diversity of their species-specific properties and functions, and highlight the related biotechnology on the basis of both laboratory tests and bioinformatics analysis. The most recent advances in the applications of antifreeze proteins are also discussed. We expect that this systematic review will contribute to the comprehensive knowledge of antifreeze proteins to readers.
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Affiliation(s)
- Hong Xiang
- Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, People's Republic of China.; CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institutes of Advanced Technology
| | - Xiaohu Yang
- Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, People's Republic of China.; CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institutes of Advanced Technology
| | - Lei Ke
- Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, People's Republic of China.; CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institutes of Advanced Technology
| | - Yong Hu
- Shenzhen Institute of Synthetic Biology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, People's Republic of China.; CAS Key Laboratory of Quantitative Engineering Biology, Shenzhen Institutes of Advanced Technology.
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8
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Kong LF, Qatran Al-Khdhairawi AA, Tejo BA. Rational design of short antifreeze peptides derived from Rhagium inquisitor antifreeze protein. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2019.101447] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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9
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Arena MP, Capozzi V, Longo A, Russo P, Weidmann S, Rieu A, Guzzo J, Spano G, Fiocco D. The Phenotypic Analysis of Lactobacillus plantarum shsp Mutants Reveals a Potential Role for hsp1 in Cryotolerance. Front Microbiol 2019; 10:838. [PMID: 31114549 PMCID: PMC6503756 DOI: 10.3389/fmicb.2019.00838] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 04/01/2019] [Indexed: 11/23/2022] Open
Abstract
Small heat shock proteins (sHSPs) are ubiquitous, low molecular weight (MW) proteins that share a conserved alpha-crystallin domain. sHSPs oligomers exhibit chaperon-like activities by interacting with unfolded substrates, thereby preventing their aggregation and precipitation. Unlike most lactobacilli, which have single shsp genes, three different sHSP-encoding genes, i.e., hsp1, hsp2, and hsp3, were previously identified in the probiotic Lactobacillus plantarum WCFS1. Early studies, including the characterization of the knock out (KO) mutant for hsp2, indicated a different organization and transcriptional regulation of these genes and suggested that the three L. plantarum sHSPs might accomplish different tasks in stress response. To unravel the role of sHSPs, KO mutants of hsp1 and hsp3 were generated using a Cre-lox based system. Mutation of either genes resulted in impaired growth capacity under normal conditions, heat-stress and stresses typically found during host interactions and food technological process. However, survival to heat shock and the level of thermal stabilization of cytoplasmic proteins were similar between mutants and parental strain. Transcriptional analysis revealed that in the mutant genetic backgrounds there is an upregulated basal expression of the un-mutated mate hsps and other stress-related genes, which may compensate for the loss of HSP function, hence possibly accounting for the lack of a remarkable susceptibility to heat challenge. HSP3 seemed relevant for the induction of thermotolerance, while HSP1 was required for improved cryotolerance. Cell surface properties and plasma membrane fluidity were investigated to ascertain the possible membrane association of sHSP. Intriguingly, the loss of hsp1 was associated to a lower level of maximal membrane fluidity upon heat stress. A role for HSP1 in controlling and improving membrane fluidity is suggested which may pertains its cryoprotective function.
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Affiliation(s)
- Mattia Pia Arena
- Department of Agriculture, Food and Environment Sciences, University of Foggia, Foggia, Italy
| | - Vittorio Capozzi
- Department of Agriculture, Food and Environment Sciences, University of Foggia, Foggia, Italy
| | - Angela Longo
- Department of Agriculture, Food and Environment Sciences, University of Foggia, Foggia, Italy
| | - Pasquale Russo
- Department of Agriculture, Food and Environment Sciences, University of Foggia, Foggia, Italy
| | - Stephanie Weidmann
- Univ. Bourgogne Franche-comté, AgroSup Dijon, PAM UMR A 02.102, Dijon, France
| | - Aurélie Rieu
- Univ. Bourgogne Franche-comté, AgroSup Dijon, PAM UMR A 02.102, Dijon, France
| | - Jean Guzzo
- Univ. Bourgogne Franche-comté, AgroSup Dijon, PAM UMR A 02.102, Dijon, France
| | - Giuseppe Spano
- Department of Agriculture, Food and Environment Sciences, University of Foggia, Foggia, Italy
| | - Daniela Fiocco
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
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Pandey P, Mallajosyula SS. Elucidating the role of key structural motifs in antifreeze glycoproteins. Phys Chem Chem Phys 2019; 21:3903-3917. [PMID: 30702099 DOI: 10.1039/c8cp06743k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Antifreeze glycoproteins (AFGPs) are distinctively riveting class of bio-macromolecules, which endows the survival of organisms inhabiting polar and subpolar regions. These proteins are believed to hinder microscopic freezing by interacting with embryonic ice crystals and precluding their further growth. The underlying molecular mechanism by which AFGPs bind to ice has remained elusive due to insufficient structural characterization, with conflicting hypotheses on the possible binding mode of AFGPs - either via the hydrophobic peptide backbone or via the hydrophilic carbohydrate side chains - when interacting with ice. Chemical synthesis has allowed researchers to access synthetic variants of natural AFGPs. These studies revealed that AFGPs exhibit huge variations in their thermal hysteresis and ice shaping behavior with only slight structural variations, especially to the carbohydrate side chains. Four key structural motifs were identified as crucial to AFGP activity: the presence of a threonine γ-methyl group, an α-glycosidic carbohydrate-protein linkage, an acetylamide group (-NHCOCH3) at the C2 position of the carbohydrate linked to the protein, and the presence of carbohydrate hydroxyl groups. In this study, we use molecular dynamics (MD) simulations to probe the microscopic properties of water accompanying these structural variations of AFGPs. We find that these variations primarily influence the conformation space of AFGPs and also crucially control their hydration dynamics. Owing to the disordered nature of AFGPs we use Markov-state modeling to identify the conformational preferences of AFGPs. The simulations reveal the importance of steric bulk, intra-molecular carbohydrate-protein H-bonds and conformational preferences (α- vs. β-linkages) in controlling the spatial segregation of the hydrophilic and hydrophobic regions of AFGPs. We hypothesize that the hydrophobic component of AFGPs is crucial to their binding to ice, which determines the ice shaping ability of AFGPs. However, the hydrophilic carbohydrate hydroxyl groups and their ability to form water bridges control the subsequent hydration dynamics, which is key to the antifreeze properties. Investigating the tetrahedral order parameter of water molecules around the carbohydrates revealed competition between solute- and bulk-influenced solvent structures, with maximum restructuring being observed in the interfacial region 2.5-4.5 Å away from the AFGPs.
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Affiliation(s)
- Poonam Pandey
- Department of Chemistry, Indian Institute of Technology Gandhinagar, Simkheda, Gandhinagar, Gujarat, India.
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11
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Villarreal P, Carrasco M, Barahona S, Alcaíno J, Cifuentes V, Baeza M. Antarctic yeasts: analysis of their freeze-thaw tolerance and production of antifreeze proteins, fatty acids and ergosterol. BMC Microbiol 2018; 18:66. [PMID: 29976143 PMCID: PMC6034288 DOI: 10.1186/s12866-018-1214-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 06/27/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Microorganisms have evolved a number of mechanisms to thrive in cold environments, including the production of antifreeze proteins, high levels of polyunsaturated fatty acids, and ergosterol. In this work, several yeast species isolated from Antarctica were analyzed with respect to their freeze-thaw tolerance and production of the three abovementioned compounds, which may also have economic importance. RESULTS The freeze-thaw tolerance of yeasts was widely variable among species, and a clear correlation with the production of any of the abovementioned compounds was not observed. Antifreeze proteins that were partially purified from Goffeauzyma gastrica maintained their antifreeze activities after several freeze-thaw cycles. A relatively high volumetric production of ergosterol was observed in the yeasts Vishniacozyma victoriae, G. gastrica and Leucosporidium creatinivorum, i.e., 19, 19 and 16 mg l- 1, respectively. In addition, a high percentage of linoleic acid with respect to total fatty acids was observed in V. victoriae (10%), Wickerhamomyces anomalus (12%) and G. gastrica (13%), and a high percentage of alpha linoleic acid was observed in L. creatinivorum (3.3%). CONCLUSIONS Given these results, the abovementioned yeasts are good candidates to be evaluated for use in the production of antifreeze proteins, fatty acids, and ergosterol at the industrial scale.
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Affiliation(s)
- Pablo Villarreal
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Mario Carrasco
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Salvador Barahona
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Jennifer Alcaíno
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Víctor Cifuentes
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Marcelo Baeza
- Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
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12
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Li LF, Liang XX. Influence of Adsorption Orientation on the Statistical Mechanics Model of Type I Antifreeze Protein: The Thermal Hysteresis Temperature. J Phys Chem B 2017; 121:9513-9517. [PMID: 28956610 DOI: 10.1021/acs.jpcb.7b06619] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The antifreeze activity of type I antifreeze proteins (AFPIs) is studied on the basis of the statistical mechanics theory, by taking the AFP's adsorption orientation into account. The thermal hysteresis temperatures are calculated by determining the system Gibbs function as well as the AFP molecule coverage rate on the ice-crystal surface. The numerical results for the thermal hysteresis temperatures of AFP9, HPLC-6, and AAAA2kE are obtained for both of the cases with and without inclusion of the adsorption orientation. The results show that the influence of the adsorption orientation on the thermal hysteresis temperature cannot be neglected. The theoretical results are coincidental preferably with the experimental data.
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Affiliation(s)
- Li-Fen Li
- Department of Basic Curriculum, North China Institute of Science and Technology , Beijing 101601, China
| | - Xi-Xia Liang
- Department of Physics, Inner Mongolia University , Hohhot 010021, China
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13
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Tseng TS, Wang SH, Chang TW, Wei HM, Wang YJ, Tsai KC, Liao YD, Chen C. Sarkosyl-Induced Helical Structure of an Antimicrobial Peptide GW-Q6 Plays an Essential Role in the Binding of Surface Receptor OprI in Pseudomonas aeruginosa. PLoS One 2016; 11:e0164597. [PMID: 27727309 PMCID: PMC5058510 DOI: 10.1371/journal.pone.0164597] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 09/27/2016] [Indexed: 12/27/2022] Open
Abstract
The emergence of antibiotic-resistant microbial strains has become a public health issue and there is an urgent need to develop new anti-infective molecules. Although natural antimicrobial peptides (AMPs) can exert bactericidal activities, they have not shown clinical efficacy. The limitations of native peptides may be overcome with rational design and synthesis. Here, we provide evidence that the bactericidal activity of a synthetic peptide, GW-Q6, against Pseudomonas aeruginosa is mediated through outer membrane protein OprI. Hyperpolarization/depolarization of membrane potential and increase of membrane permeability were observed after GW-Q6 treatment. Helical structure as well as hydrophobicity was induced by an amphipathic surfactant, sarkosyl, for binding to OprI and possible to membrane. NMR studies demonstrated GW-Q6 is an amphipathic α-helical structure in DPC micelles. The paramagnetic relaxation enhancement (PRE) approach revealed that GW-Q6 orients its α-helix segment (K7-K17) into DPC micelles. Additionally, this α-helix segment is critical for membrane permeabilization and antimicrobial activity. Moreover, residues K3, K7, and K14 could be critical for helical formation and membrane binding while residues Y19 and W20 for directing the C-terminus of the peptide to the surface of micelle. Taken together, our study provides mechanistic insights into the mode of action of the GW-Q6 peptide and suggests its applicability in modifying and developing potent AMPs as therapeutic agents.
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Affiliation(s)
- Tien-Sheng Tseng
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Shih-Han Wang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Ting-Wei Chang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Hung-Mu Wei
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Yu-June Wang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Keng-Chang Tsai
- National Research Institute of Chinese Medicine, Ministry of Health and Welfare, Taipei, Taiwan
- The Ph.D. Program for Medical Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
| | - You-Di Liao
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
- * E-mail: (YDL); (CC)
| | - Chinpan Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
- * E-mail: (YDL); (CC)
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