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Esfandeh S, Danehkar A, Salmanmahiny A, Alipour H, Kazemzadeh M, Marcu MV, Sadeghi SMM. Climate change projection using statistical downscaling model over southern coastal Iran. Heliyon 2024; 10:e29416. [PMID: 38681611 PMCID: PMC11046118 DOI: 10.1016/j.heliyon.2024.e29416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 04/05/2024] [Accepted: 04/08/2024] [Indexed: 05/01/2024] Open
Abstract
Iran is highly vulnerable to climate change, particularly evident in shifting precipitation and temperature patterns, especially in its southern coastal region. With these changing climate conditions, there is an urgent need for practical and adaptive management of water resources and energy supply to address the challenges posed by future climate change. Over the next two to three decades, the effects of climate change, such as precipitation and temperature, are expected to worsen, posing greater risks to water resources, agriculture, and infrastructure stability. Therefore, this study aims to evaluate the alterations in mean daily temperature (Tmean) and total daily rainfall (rrr24) utilizing climate change scenarios from both phases 5 and 6 of the Coupled Model Inter-comparison Project (CMIP5 and CMIP6, respectively) in the southern coastal regions of Iran (Hormozgan province), specifically north of the Strait of Hormuz. The predictions were generated using the Statistical Downscaling Model (SDSM) and National Centre for Environmental Prediction (NCEP) predictors, incorporating climate change scenarios from CMIP5 with Representative Concentration Pathways (RCPs) 2.6, 4.5, and 8.5 and CMIP6 with Shared Socioeconomic Pathways (SSPs) 1, 2, and 5. The analysis was conducted for three distinct time periods: the early 21st century (2021-2045), middle 21st century (2046-2071), and late 21st century (2071-2095). The results indicated that the CMIP5 model outperformed the CMIP6 model in simulating and predicting Tmean and rrr24. In addition, a significant increase in Tmean was observed across all the scenarios and time periods, with the most pronounced trend occurring in the middle and late 21st century future periods. This increase was already evident during the base period of 2021-2045 across all scenarios. Moreover, the fluctuations in precipitation throughout the region and across all scenarios were significant in the three examined future periods. The results indicated that among CMIP5 scenarios, RCP8.5 had highest changes of Tmean (+1.22 °C) in Bandar Lengeh station in 2071-2095 period. The lowest change magnitude of Tmean among CMIP5 scenarios was found in RCP4.5 (-1.94 °C) in Ch station in 2046-2070 period. The results indicated that among CMIP5 scenarios, RCP8.5 had highest changes of rrr24 (+150.2 mm) in Chabahar station in 2071-2095 period. The lowest change magnitude of rrr24 among CMIP5 scenarios was found in RCP8.5 (-25.8 mm) in Bandar Abbas station in 2046-2070 period. In conclusion, the study reveals that the coastal area of Hormozgan province will experience rising temperatures and changing rainfall patterns in the future. These changes may lead to challenges such as increased water and energy consumption, heightened risks of droughts or floods, and potential damage to agriculture and infrastructure. These findings offer valuable insights for implementing local mitigation policies and strategies and adapting to emerging climate changes in Hormozgan's coastal areas. For example, utilizing water harvesting technologies, implementing watershed management practices, and adopting new irrigation systems can address challenges like water consumption, agricultural impacts, and infrastructure vulnerability. Future research should accurately assess the effect of these changes in precipitation and temperature on water resources, forest ecosystems, agriculture, and other infrastructures in the study area to implement effective management measures.
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Affiliation(s)
- Sorour Esfandeh
- Department of Environmental Science and Engineering, Faculty of Natural Resources, University of Tehran, Karaj, Iran
| | - Afshin Danehkar
- Department of Environmental Science and Engineering, Faculty of Natural Resources, University of Tehran, Karaj, Iran
| | - Abdolrassoul Salmanmahiny
- Department of Environmental Science, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
| | - Hassan Alipour
- Department of Arid and Mountain Reclamation Engineering, Faculty of Natural Resources, University of Tehran, Karaj, Iran
| | - Majid Kazemzadeh
- Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Marina Viorela Marcu
- Department of Forest Engineering, Forest Management Planning and Terrestrial Measurements, Faculty of Silviculture and Forest Engineering, Transilvania University of Brasov, Şirul Beethoven 1, 500123, Brasov, Romania
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Hosseinizadeh Z, Osanloo M, Alipour H, Heiran R, Shahriari-Namadi M, Moemenbellah-Fard MD. Nanoliposomal Trachyspermum ammi (L) sprague essential oil for effective control of malaria mosquito larvae, Anopheles stephensi Liston. Exp Parasitol 2023; 255:108644. [PMID: 37939823 DOI: 10.1016/j.exppara.2023.108644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Revised: 09/20/2023] [Accepted: 10/24/2023] [Indexed: 11/10/2023]
Abstract
Controlling mosquito vectors at immature stages using larvicides is a practical strategy to stave off mosquito-borne diseases such as malaria. Developing nanoliposomes bearing essential oil is a promising approach to improving the efficacy and stability of EOs-derived larvicides. The main aim of this investigation was to assess the efficacy of nanoliposome containing Trachyspermum ammi L. EO (TAEO-NL) as a new potential formulation to control Anopheles stephensi Liston (Diptera, Culicidae) mosquito larvae. The chemical constituents of T. ammi L. essential oil (TAEO) were first investigated using gas chromatography-mass spectrometry (GC-MS) analysis; its dominant component (48.22%) was thymol. TAEO-NL with a particle size of 54.6 ± 5 nm and zeta potential of -18 ± 0.5 mV were then prepared using the ethanol injection method. Besides, the successful loading of TAEO was confirmed using Attenuated Total Reflection-Fourier Transform Infra-Red (ATR-FTIR) spectroscopy analysis. A significant difference (P < 0.05) was observed in the efficacy of TAEO-NL and TAEO with lethal concentration 50% (LC50) values of 14.09 and 59.47 μg/mL against An. stephensi larvae. However, free nanoliposomes show negligible larvicidal effects (<5%). This nano-formulation could thus be suggested as a green product against insects to impede transmission of deadly infectious diseases with possible field applicability scope.
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Affiliation(s)
- Z Hosseinizadeh
- Student Research Committee, Department of Biology and Control of Disease Vectors, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - M Osanloo
- Department of Medical Nanotechnology, School of Advanced Technologies in Medicine, Fasa University of Medical Sciences (FUMS), Fasa, Iran.
| | - H Alipour
- Research Center for Health Sciences, Institute of Health, Department of Biology and Control of Disease Vectors, School of Health, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran.
| | - R Heiran
- Estahban Higher Education Center- Shiraz University, Estahban, Iran.
| | - M Shahriari-Namadi
- Student Research Committee, Department of Biology and Control of Disease Vectors, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - M D Moemenbellah-Fard
- Research Center for Health Sciences, Institute of Health, Department of Biology and Control of Disease Vectors, School of Health, Shiraz University of Medical Sciences (SUMS), Shiraz, Iran.
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Alipour H, Hamedani A, Alahyarizadeh G, Jahanzadeh A. First principle study on the mechanical response of ZrC and ZrN at high-pressure conditions: anisotropy perspective. Molecular Simulation 2021. [DOI: 10.1080/08927022.2021.1957881] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- H. Alipour
- Faculty of Engineering, Shahid Beheshti University, Tehran, Iran
| | - A. Hamedani
- Faculty of Engineering, Shahid Beheshti University, Tehran, Iran
| | | | - A. Jahanzadeh
- Electronic Department, Faculty of Electrical, Electronics and Marine Telecommunications, Imam Khomeini University of Noshahr, Noshahr, Iran
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Alipour H, Duus RK, Wimmer R, Dardmeh F, Du Plessis SS, Jørgensen N, Christiansen OB, Hnida C, Nielsen HI, Van Der Horst G. Seminal plasma metabolomics profiles following long (4-7 days) and short (2 h) sexual abstinence periods. Eur J Obstet Gynecol Reprod Biol 2021; 264:178-183. [PMID: 34325212 DOI: 10.1016/j.ejogrb.2021.07.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 07/08/2021] [Accepted: 07/12/2021] [Indexed: 12/25/2022]
Abstract
OBJECTIVE Metabolomic profiling of seminal plasma has been suggested as a possible approach for a fast and non-invasive male infertility evaluation diagnosis. However, metabolomics profiles in normozoospermic men have not been thoroughly investigated, and the influence of ejaculation-abstinence has not been described. To provide interim reference values and find associations between the metabolomics profiles of human seminal plasma and length of ejaculation-abstinence period in normozoospermic men. STUDY DESIGN Semen samples collected after long (4-7 days) and short abstinence (2 h) from 31 normozoospermic males were assessed for routine quality parameters before the seminal plasma was separated by centrifugation. Metabolomics profiles of the seminal plasma were then determined using untargeted Nuclear Magnetic Resonance Spectroscopy. RESULTS In total, 30 metabolites were identified. Pyruvate showed a higher concentration, while fructose, acetate, choline, methanol, N-acetylglucosamine, O-acetylcarnitine, uridine, and sn-glycero-3-phosphocoline showed lower concentrations in samples collected after short abstinence (vs. long). All metabolites showed lower absolute amounts (volume × concentration) following shorter abstinence. However, the lower sperm concentration in samples collected after short abstinence resulted in higher absolute amounts of pyruvate and taurine per spermatozoa: pyruvate 1.92 (1.12-3.87) vs. 1.29 (0.83-2.62) (P < 0.001) and taurine 0.58 (0.36-0.92) vs. 0.43 (0.28-0.95) (P < 0.05) ng/106 spermatozoa. Simultaneously, there was a higher percentage of progressively motile spermatozoa in samples collected after the short abstinence. CONCLUSION The generally lower concentrations of seminal metabolites after short abstinence periods may be related to the shorter time available for secretion and collection of these metabolites by the accessory glands and the epididymides. The concomitant lower number of spermatozoa in the second ejaculate resulted in increased absolute amounts of pyruvate and taurine per spermatozoa, accompanied by increased spermatozoa motility in these samples. The simultaneous increase in percentages of motile spermatozoa and absolute amounts of pyruvate and taurine per spermatozoa after shorter abstinence might indicate that these two metabolites play a more critical role in sperm motility, which should be further investigated in future studies.
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Affiliation(s)
- H Alipour
- Department of Health Science and Technology, Regenerative Medicine Group, Aalborg University, Aalborg, Denmark.
| | - R K Duus
- Department of Health Science and Technology, Regenerative Medicine Group, Aalborg University, Aalborg, Denmark
| | - R Wimmer
- Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark
| | - F Dardmeh
- Department of Health Science and Technology, Regenerative Medicine Group, Aalborg University, Aalborg, Denmark
| | - S S Du Plessis
- Department of Basic Medical Sciences, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates; Division of Medical Physiology, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg, South Africa
| | - N Jørgensen
- University Department of Growth and Reproduction and International Center for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, Copenhagen, Denmark
| | - O B Christiansen
- Department of Obstetrics and Gynecology, Fertility Unit, Aalborg University Hospital, Aalborg, Denmark; Institute of Clinical Medicine, Aalborg University, Denmark
| | - C Hnida
- Department of Obstetrics and Gynecology, Fertility Unit, Aalborg University Hospital, Aalborg, Denmark
| | - H I Nielsen
- Department of Health Science and Technology, Regenerative Medicine Group, Aalborg University, Aalborg, Denmark
| | - G Van Der Horst
- Department of Medical Biosciences, University of the Western Cape, Cape Town, South Africa
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Kazemzadeh M, Noori Z, Alipour H, Jamali S, Seyednasrollah B. Natural and anthropogenic forcings lead to contrasting vegetation response in long-term vs. short-term timeframes. J Environ Manage 2021; 286:112249. [PMID: 33677345 DOI: 10.1016/j.jenvman.2021.112249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 02/20/2021] [Accepted: 02/21/2021] [Indexed: 06/12/2023]
Abstract
Understanding vegetation response to natural and anthropogenic forcings is vital for managing watersheds as natural ecosystems. We used a novel integrated framework to separate the impacts of natural factors (e.g. drought, precipitation and temperature) from those of anthropogenic factors (e.g. human activity) on vegetation cover change at the watershed scale. We also integrated several datasets including satellite remote sensing and in-situ measurements for a twenty-year time period (2000-2019). Our results show that despite no significant trend being observed in temperature and precipitation, vegetation indices expressed an increasing trend at both the control and treated watersheds. The vegetation cover was not significantly affected by the natural factors whereas the watershed management practice (as a human activity) had significant impacts on vegetation change in the long-term. Further, the vegetation cover long-term response to watershed management practice was mainly linear. We also found that the vegetation indices values in the 2011-2019 period (as the treated period in treated watershed) were significantly higher than those in the 2000-2010 period. In the short-term, however, the drought condition and decreased precipitation (as natural factors) explained the majority of the change in vegetation cover. For example, the majority of the breakpoints occurred in 2008, and it was related to a widespread extreme drought in the area. The watershed management practice as a human activity along with extreme climatic events could explain a large part of the vegetation changes observed in the treated and control watersheds.
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Affiliation(s)
| | - Zahra Noori
- Faculty of Natural Resources, University of Tehran, Iran.
| | - Hassan Alipour
- Faculty of Natural Resources, University of Tehran, Iran.
| | - Sadegh Jamali
- Department of Technology and Society, Faculty of Engineering, Lund University, Box 118, 221 00, Lund, Sweden.
| | - Bijan Seyednasrollah
- School of Informatics, Computing and Cyber Systems, Northern Arizona University, Flagstaff, AZ, USA.
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Alipour H, Van Der Horst G, Christiansen O, Dardmeh F, Jørgensen N, Nielsen H, Hnida C. Improved sperm kinematics in semen samples collected after 2 h versus 4–7 days of ejaculation abstinence. Hum Reprod 2017; 32:1364-1372. [DOI: 10.1093/humrep/dex101] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Accepted: 04/29/2017] [Indexed: 11/13/2022] Open
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Dardmeh F, Alipour H, Nielsen H, Rasmussen S, Yousefi J, Ditlevsen N, Yassin H, Morina E, Duus R, Gazerani P. Association between chronic pain and the sperm motion characteristics. Scand J Pain 2015. [DOI: 10.1016/j.sjpain.2015.04.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Abstract
Aims
Sex hormones play an important role in pain in many chronic pain conditions. Relationship between chronic pain and sperm quality has not been investigated thoroughly and may provide an insight to better understanding, management and treatment of cases where chronic pain and male sub-fertility co-exist.
Methods
Neat (fresh semen) and processed sperm from 15 males with orthopedic chronic pain (CP) were assessed and compared with 15 healthy age matched controls. Sperm analysis was performed using the SCA computer-aided sperm analyzer.
Results
There was no significant difference in any parameters of the neat semen between the pain and control group. However the percentage of non-progressive motile spermatozoa (type B) was significantly higher in the pain group (27.96) compared to the control group (15.96). Straight line trajectories including linearity, straightness, wobble and beat cross frequency were also significantly higher in the processed sample of the CP group.
Conclusions
This study demonstrated that chronic pain does not affect the sperm morphology, total concentration and motility based on conventional analysis but has significant influence at the level of sperm motion kinetics which could prove to be clinically valuable, prognostic indicators of successful fertilization. Maturation of sperm motility occurs during their transit through the epididymis and vas deferens regulated by androgens. As male gonadal hormones haveaninhibitory, adaptive effectonthe behavioral and neuronal responses to repeated nociceptive stimulation, it can be speculated that the observed difference in sperm kinematic parameters could be related to the alterations in serum sex hormone levels emanating from the chronic pain. Further studies are required to explain the possible mechanism of actionof chronic pain on male fertility.
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Affiliation(s)
- F. Dardmeh
- Department of Health Science and Technology, Biomedicine Group, Faculty of Medicine , Aalborg University , Aalborg , Denmark
- Center for Sensory – Motor Interaction (SMI), Department of Health Science and Technology, Faculty of Medicine , Aalborg University , Aalborg , Denmark
- Department of Clinical Medicine, The Faculty of Medicine , Aalborg University Hospital , Aalborg , Denmark
| | - H. Alipour
- Department of Health Science and Technology, Biomedicine Group, Faculty of Medicine , Aalborg University , Aalborg , Denmark
| | - H.I. Nielsen
- Department of Health Science and Technology, Biomedicine Group, Faculty of Medicine , Aalborg University , Aalborg , Denmark
| | - S. Rasmussen
- Department of Clinical Medicine, The Faculty of Medicine , Aalborg University Hospital , Aalborg , Denmark
| | - J.T. Yousefi
- Department of Health Science and Technology, Biomedicine Group, Faculty of Medicine , Aalborg University , Aalborg , Denmark
| | - N.E. Ditlevsen
- Department of Health Science and Technology, Biomedicine Group, Faculty of Medicine , Aalborg University , Aalborg , Denmark
| | - H.A.A.K.T. Yassin
- Department of Health Science and Technology, Biomedicine Group, Faculty of Medicine , Aalborg University , Aalborg , Denmark
| | - E. Morina
- Department of Health Science and Technology, Biomedicine Group, Faculty of Medicine , Aalborg University , Aalborg , Denmark
| | - R.K. Duus
- Department of Health Science and Technology, Biomedicine Group, Faculty of Medicine , Aalborg University , Aalborg , Denmark
| | - P. Gazerani
- Department of Health Science and Technology, Biomedicine Group, Faculty of Medicine , Aalborg University , Aalborg , Denmark
- Center for Sensory – Motor Interaction (SMI), Department of Health Science and Technology, Faculty of Medicine , Aalborg University , Aalborg , Denmark
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Esmaeili V, Shahverdi AH, Alizadeh AR, Alipour H, Chehrazi M. Saturated, omega-6 and omega-3 dietary fatty acid effects on the characteristics of fresh, frozen-thawed semen and blood parameters in rams. Andrologia 2012; 46:42-49. [DOI: 10.1111/and.12040] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/18/2012] [Indexed: 11/30/2022] Open
Affiliation(s)
- V. Esmaeili
- Department of Embryology; Reproductive Biomedicine Center; Royan Institute for Reproductive Biomedicine; ACECR; Tehran Iran
| | - A. H. Shahverdi
- Department of Embryology; Reproductive Biomedicine Center; Royan Institute for Reproductive Biomedicine; ACECR; Tehran Iran
| | - A. R. Alizadeh
- Department of Animal Science; Saveh Branch; Islamic Azad University; Saveh Iran
| | - H. Alipour
- Department of Embryology; Reproductive Biomedicine Center; Royan Institute for Reproductive Biomedicine; ACECR; Tehran Iran
| | - M. Chehrazi
- Department of Epidemiology and Reproductive Health; Reproductive Epidemiology Research Center; Royan Institute; ACECR; Tehran Iran
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Alipour H, Esmaeili M, Kia K. Supporting security against SYN flooding attacks in distributed denial-of-service via measuring internet protocol flow information export-based traffic. IJESDF 2009. [DOI: 10.1504/ijesdf.2009.023875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Eriksson P, Alipour H, Adler L, Blomberg A. Rap1p-binding sites in the saccharomyces cerevisiae GPD1 promoter are involved in its response to NaCl. J Biol Chem 2000; 275:29368-76. [PMID: 10842169 DOI: 10.1074/jbc.m001663200] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mechanisms involved in transcriptional regulation of the osmotically controlled GPD1 gene in Saccharomyces cerevisiae were investigated by promoter analysis. The GPD1 gene encodes NAD(+)-dependent glycerol-3-phosphate dehydrogenase, a key enzyme in the production of the compatible solute glycerol. By analysis of promoter deletions, we identified a region at nucleotides -478 to -324, in relation to start of translation, to be of great importance for both basal activity and osmotic induction of GPD1. Electrophoretic mobility shift and DNase I footprint analyses demonstrated protein binding to parts of this region that contain three consensus sequences for Rap1p (repressor activator protein 1)-binding sites. Actual binding of Rap1p to this region was confirmed by demonstrating enhanced electrophoretic mobility of the protein-DNA complex with extracts containing an N-terminally truncated version of Rap1p. The detected Rap1p-DNA interactions were not affected by changes in the osmolarity of the growth medium. Specific inactivation of the Rap1p-binding sites by a C-to-A point mutation in the core of the consensus showed that this factor is a major determinant of GPD1 expression since mutations in all three putative binding sites for Rap1p strongly hampered osmotic induction and drastically lowered basal activity. We also show that the Rap1p-binding sites appear functionally distinct; the most distal site (core of the consensus at position -386) exhibited the highest affinity for Rap1p and was strictly required for low salt induction (< or =0.6 m NaCl), but not for the response at higher salinities (> or =0.8 m NaCl). This indicates tha different molecular mechanisms might be operational for low and high salt responses of the GPD1 promoter.
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Affiliation(s)
- P Eriksson
- Department of Cell and Molecular Biology-Microbiology, Lundberg Laboratory, Göteborg University, Medicinaregatan 9C, S-413 90 Göteborg, Sweden
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Alipour H, Eriksson P, Norbeck J, Blomberg A. Quantitative aspects of the use of bacterial chloramphenicol acetyltransferase as a reporter system in the yeast Saccharomyces cerevisiae. Anal Biochem 1999; 270:153-8. [PMID: 10328777 DOI: 10.1006/abio.1999.4069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The quantitative aspects of the use of the reporter system chloramphenicol acetyltransferase (CAT) has been evaluated in the yeast Saccharomyces cerevisiae. It was found that the CAT activity measured with a radiosotopic fluor diffusion assay was strongly dependent on the amount of yeast extract applied, both when CAT was expressed endogenously and when a purified Escherichia coli enzyme was investigated. Desalting the yeast extract by gel filtration partly eliminated the problem, indicating that some low-molecular-weight compound was involved in the phenomenon. However, the extract still exhibited stability problems on ice. An immunological CAT assay was tested and found to yield satisfactory quantitative result.
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Affiliation(s)
- H Alipour
- Department of Cell and Molecular Biology, Göteborg University, Medicinaregaten 9c, Göteborg, 405 30, Sweden
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