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https://www.readbyqxmd.com/read/29779101/the-role-of-epibionts-of-bacteria-of-the-genus-pseudoalteromonas-and-cellular-proteasomes-in-the-adaptive-plasticity-of-marine-cold-water-sponges
#1
O I Kravchuk, A I Lavrov, A D Finoshin, N G Gornostaev, A A Georgiev, S B Abaturova, V S Mikhailov, Yu V Lyupina
It was found that cells of different color morphs of the cold-water marine sponges Halichondria panicea (Pallas, 1766) of the class Demospongiae differ in the content of epibionts of bacteria of the genus Pseudoalteromonas. The sponge cells with elevated levels of epibionts of bacteria of the genus Pseudoalteromonas showed an increased expression of Hsp70 proteins but had a reduced level of the proteasomal catalytic beta 5 subunit, which was accompanied by a change in their activity. Probably, epibionts of bacteria of the genus Pseudoalteromonas may affect the ubiquitin-proteasome system in the cells of cold-water marine sponges and, thereby, ensure their adaptive plasticity...
March 2018: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29776459/phycoremediation-of-municipal-wastewater-by-the-cold-adapted-microalga-monoraphidium-sp-dek19
#2
(no author information available yet)
Present municipal wastewater treatment technologies often require substantial energy inputs, and fail to completely remove nitrate and phosphate before discharging effluent. In contrast, utilizing the cold-adapted oleaginous microalga Monoraphidium sp. Dek 19 decreased levels of both these polluting ions to 0 mg/dl. Concurrent biomass production was greater at 10oC than at 22 oC, showing that phycoremediation occurred at low temperatures previously thought to be unsuitable for algal-based treatment. Algal growth with uptake of nitrate and phosphate required only short bursts of aeration to suspend cells and maintain CO2 supply for photosynthesis...
May 8, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29775634/the-direction-of-protein-evolution-is-destined-by-the-stability
#3
Natsuko Ota, Ryo Kurahashi, Satoshi Sano, Kazufumi Takano
Protein evolution is potentially governed by protein stability. Here, we investigated the relationship between protein evolution and stability through the random mutational drift of a thermophilic bacterial protein, an esterase of Alicyclobacillus acidocaldarius (Aac-Est), at high and low temperatures. In the first random mutation of Aac-Est, few proteins exhibit increased activity at 65°C, indicating that the wild-type (WT) Aac-Est is located on the peak of a mountain in a fitness landscape for activity at high temperature...
May 15, 2018: Biochimie
https://www.readbyqxmd.com/read/29775460/genus-wide-comparison-of-pseudovibrio-bacterial-genomes-reveal-diverse-adaptations-to-different-marine-invertebrate-hosts
#4
Anoop Alex, Agostinho Antunes
Bacteria belonging to the genus Pseudovibrio have been frequently found in association with a wide variety of marine eukaryotic invertebrate hosts, indicative of their versatile and symbiotic lifestyle. A recent comparison of the sponge-associated Pseudovibrio genomes has shed light on the mechanisms influencing a successful symbiotic association with sponges. In contrast, the genomic architecture of Pseudovibrio bacteria associated with other marine hosts has received less attention. Here, we performed genus-wide comparative analyses of 18 Pseudovibrio isolated from sponges, coral, tunicates, flatworm, and seawater...
2018: PloS One
https://www.readbyqxmd.com/read/29774046/identification-of-rice-genes-associated-with-enhanced-cold-tolerance-by-comparative-transcriptome-analysis-with-two-transgenic-rice-plants-overexpressing-dacbf4-or-dacbf7-isolated-from-antarctic-flowering-plant-deschampsia-antarctica
#5
Mi Young Byun, Li Hua Cui, Jungeun Lee, Hyun Park, Andosung Lee, Woo Taek Kim, Hyoungseok Lee
Few plant species can survive in Antarctica, the harshest environment for living organisms. Deschampsia antarctica is the only natural grass species to have adapted to and colonized the maritime Antarctic. To investigate the molecular mechanism of the Antarctic adaptation of this plant, we identified and characterized D. antarctica C-repeat binding factor 4 ( DaCBF4 ), which belongs to monocot CBF group IV. The transcript level of DaCBF4 in D. antarctica was markedly increased by cold and dehydration stress...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29771387/functional-brown-adipose-tissue-and-sympathetic-activity-after-cold-exposure-in-humans-with-type-1-narcolepsy
#6
Lotte Hahn Enevoldsen, Marie Tindborg, Nichlas Lindegaard Hovmand, Christina Christoffersen, Helga Ellingsgaard, Charlotte Suetta, Bente Merete Stallknecht, Poul Joergen Jennum, Andreas Kjær, Steen Gammeltoft
Study objectives: To investigate the activity of brown adipose tissue (BAT) in type 1 narcolepsy patients during cold exposure using two separate scans of sympathetic and metabolic activity of BAT in order to evaluate whether orexin deficiency leads to altered non-shivering thermoregulation in narcolepsy. Methods: Seven patients with type 1 narcolepsy and seven healthy controls underwent two consecutive scans after 2 h cold exposure: 123I-meta-iodo-benzyl-guanidine (123I-MIBG) single photon emission computed tomography and 18F-2-deoxy-glucose (18F-FDG) positron emission tomography and computed tomography to visualize sympathetic innervation and metabolic activity of BAT, respectively...
May 15, 2018: Sleep
https://www.readbyqxmd.com/read/29769358/resolving-the-phylogenetic-position-of-darwin-s-extinct-ground-sloth-mylodon-darwinii-using-mitogenomic-and-nuclear-exon-data
#7
Frédéric Delsuc, Melanie Kuch, Gillian C Gibb, Jonathan Hughes, Paul Szpak, John Southon, Jacob Enk, Ana T Duggan, Hendrik N Poinar
Mylodon darwinii is the extinct giant ground sloth named after Charles Darwin, who first collected its remains in South America. We have successfully obtained a high-quality mitochondrial genome at 99-fold coverage using an Illumina shotgun sequencing of a 12 880-year-old bone fragment from Mylodon Cave in Chile. Low level of DNA damage showed that this sample was exceptionally well preserved for an ancient subfossil, probably the result of the dry and cold conditions prevailing within the cave. Accordingly, taxonomic assessment of our shotgun metagenomic data showed a very high percentage of endogenous DNA with 22% of the assembled metagenomic contigs assigned to Xenarthra...
May 16, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29765071/effects-of-cold-acclimation-and-dsrna-injections-on-gs1l-gene-splicing-in-drosophila-montana
#8
David Hopkins, Tapio Envall, Noora Poikela, Olli T Pentikäinen, Maaria Kankare
Alternative splicing, in which one gene produce multiple transcripts, may influence how adaptive genes respond to specific environments. A newly produced transcriptome of Drosophila montana shows the Gs1-like (Gs1l) gene to express multiple splice variants and to be down regulated in cold acclimated flies with increased cold tolerance. Gs1l's effect on cold tolerance was further tested by injecting cold acclimated and non-acclimated flies from two distantly located northern and southern fly populations with double stranded RNA (dsRNA) targeting Gs1l...
May 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29764987/rapid-and-dynamic-alternative-splicing-impacts-the-arabidopsis-cold-response-transcriptome
#9
Cristiane P G Calixto, Wenbin Guo, Allan B James, Nikoleta A Tzioutziou, Juan C Entizne, Paige E Panter, Heather Knight, Hugh Nimmo, Runxuan Zhang, John W S Brown
Plants have adapted to tolerate and survive constantly changing environmental conditions by re-programming gene expression. The dynamics of the contribution of alternative splicing (AS) to stress responses are unknown. RNA-sequencing of a time-series of Arabidopsis thaliana plants exposed to cold determines the timing of significant AS changes. This shows a massive and rapid AS response with coincident waves of transcriptional and AS activity occurring in the first few hours of temperature reduction, and further AS throughout the cold...
May 15, 2018: Plant Cell
https://www.readbyqxmd.com/read/29761710/who-s-the-boss-determining-the-control-pathways-of-cardiovascular-and-cellular-immune-responses-to-acute-stress
#10
Kate M Edwards, Nathan B Morris
Acute stress responses are known to include increases in heart rate and blood pressure, as well as increases in the number of circulating immune cells, all of which are governed by the autonomic nervous system. This laboratory practical measures cardiovascular and circulating immune cell responses to a passive (cold pressor) and active (mental arithmetic) acute stress task in student participants. The results allow them to examine the different patterns of autonomic response they elicit (approximated by heart rate and blood pressure responses), and knowledge of these responses can then be used to infer the governing autonomic aspect of the increases in circulating immune cells from the results...
June 1, 2018: Advances in Physiology Education
https://www.readbyqxmd.com/read/29761697/identification-of-proteins-using-itraq-and-vigs-reveals-three-bread-wheat-proteins-involved-in-the-response-to-combined-osmotic-cold-stress
#11
Ning Zhang, Lingran Zhang, Chaonan Shi, Lei Zhao, Dangqun Cui, Feng Chen
Crops are often subjected to a combination of stresses in the field. To date, studies on the physiological and molecular responses of common wheat to a combination of osmotic and cold stresses, however, remain unknown. In this study, wheat seedlings exposed to osmotic-cold stress for 24 h showed inhibited growth, as well as increased lipid peroxidation, relative electrolyte leakage, and soluble sugar contents. iTRAQ-based quantitative proteomics and liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods were employed to determine the proteomic profiles of the roots and leaves of wheat seedlings exposed to osmotic-cold stress conditions...
May 15, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29761378/inhibition-and-substrate-specificity-properties-of-fkbp22-from-a-psychrotrophic-bacterium-shewanella-sp-sib1
#12
Cahyo Budiman, Herman Umbau Lindang, Bo Eng Cheong, Kenneth F Rodrigues
SIB1 FKBP22 is a peptidyl prolyl cis-trans isomerase (PPIase) member from a psychrotrophic bacterium, Shewanella sp. SIB1, consisting of N- and C-domains responsible for dimerization and catalytic PPIase activity, respectively. This protein was assumed to be involved in cold adaptation of SIB1 cells through its dual activity of PPIase activity and chaperone like-function. Nevertheless, the catalytic inhibition by FK506 and its substrate specificity remain unknown. Besides, ability of SIB1 FKBP22 to inhibit phosphatase activity of calcinuerin is also interesting to be studied since it may reflect wider cellular functions of SIB1 FKBP22...
May 14, 2018: Protein Journal
https://www.readbyqxmd.com/read/29756383/a-novel-affective-motivational-based-overground-system-for-detecting-spinal-cord-injury-associated-thermal-and-mechanical-hypersensitivity-in-rats
#13
Elizabeth A Dugan, Jacqueline Sagen
BACKGROUND: Preclinical research for neuropathic pain has depended primarily on the use of behavioral nociceptive testing that is sensory-discriminatory based and reflexive in nature. This can be particularly problematic in spinal cord injury (SCI) associated neuropathic pain research where hyperreflexia may develop thus confounding interpretation of reflexive responses as pain symptoms. To address this, we have designed an affective-motivational based Overground System that has interchangeable floors to allow examination of nociceptive behaviors in response to mechanical and cold stimuli prior to and following spinal cord injury...
May 14, 2018: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/29755482/silicon-improves-chilling-tolerance-during-early-growth-of-maize-by-effects-on-micronutrient-homeostasis-and-hormonal-balances
#14
Narges Moradtalab, Markus Weinmann, Frank Walker, Birgit Höglinger, Uwe Ludewig, Guenter Neumann
Low soil temperature in spring is a major constraint for the cultivation of tropical and subtropical crops in temperate climates, associated with inhibition of root growth and activity, affecting early growth and frequently plant performance and final yield. This study was initiated to investigate the physiological base of cold-protective effects induced by supplementation with silicon (Si), widely recommended as a stress-protective mineral nutrient. Maize was used as a cold-sensitive model plant, exposed to chilling stress and low root-zone temperature (RZT) during early growth in a lab to field approach...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29755411/time-of-day-effects-on-metabolic-and-clock-related-adjustments-to-cold
#15
Frederico Sander Mansur Machado, Zhi Zhang, Yan Su, Paul de Goede, Remi Jansen, Ewout Foppen, Cândido Celso Coimbra, Andries Kalsbeek
Background: Daily cyclic changes in environmental conditions are key signals for anticipatory and adaptive adjustments of most living species, including mammals. Lower ambient temperature stimulates the thermogenic activity of brown adipose tissue (BAT) and skeletal muscle. Given that the molecular components of the endogenous biological clock interact with thermal and metabolic mechanisms directly involved in the defense of body temperature, the present study evaluated the differential homeostatic responses to a cold stimulus at distinct time-windows of the light/dark-cycle...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29752887/chloromonas-svalbardensis-n-sp-with-insights-into-the-phylogroup-chloromonadinia-chlorophyceae
#16
Dovilė Barcytė, Ladislav Hodač, Linda Nedbalová, Josef Elster
The traditional green algal genus Chloromonas accommodates mesophilic, cold-tolerant and cold-adapted microorganisms. In this paper we studied a new strain isolated from a wet hummock meadow in the High Arctic. We used morphological, ultrastructural and molecular data to assess the taxonomic position and phylogenetic relationships of the new isolate. The observed morphological features generally corresponded to the cold-tolerant Chloromonas characteristics. However, ellipsoidal or wide ellipsoidal vegetative cells, a massive parietal cup-shaped chloroplast with a number of continuously connected lobes, a thick cell wall, a prominent hemispherical papilla and the anterior position of an oblong or round eyespot distinguished the alga from all previously described Chloromonas species...
May 12, 2018: Journal of Eukaryotic Microbiology
https://www.readbyqxmd.com/read/29751060/expression-and-deletion-analyses-of-cspe-encoding-cold-shock-protein-e-in-acinetobacter-oleivorans-dr1
#17
Jisun Kim, Sunhee Ha, Woojun Park
Six genes encoding cold-shock-like proteins, including cspE, are contained within the genome of Acinetobacter oleivorans DR1. All six genes are similar in size as well as amino acid identity, but appear to be differentially regulated under stressful conditions. Four of these genes (cspA, cspB, cspC and cspE) were functionally important during cold shock because of their gradual upregulation during a temperature decrease under our assay conditions. cspE also showed higher expression during alkane degradation and antibiotic exposure...
May 8, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29749114/mechanisms-underlying-insect-freeze-tolerance
#18
Jantina Toxopeus, Brent J Sinclair
Freeze tolerance - the ability to survive internal ice formation - has evolved repeatedly in insects, facilitating survival in environments with low temperatures and/or high risk of freezing. Surviving internal ice formation poses several challenges because freezing can cause cellular dehydration and mechanical damage, and restricts the opportunity to metabolise and respond to environmental challenges. While freeze-tolerant insects accumulate many potentially protective molecules, there is no apparent 'magic bullet' - a molecule or class of molecules that appears to be necessary or sufficient to support this cold-tolerance strategy...
May 10, 2018: Biological Reviews of the Cambridge Philosophical Society
https://www.readbyqxmd.com/read/29746664/translational-control-plays-an-important-role-in-the-adaptive-heat-shock-response-of-streptomyces-coelicolor
#19
Giselda Bucca, Radhika Pothi, Andrew Hesketh, Carla Möller-Levet, David A Hodgson, Emma E Laing, Graham R Stewart, Colin P Smith
Stress-induced adaptations require multiple levels of regulation in all organisms to repair cellular damage. In the present study we evaluated the genome-wide transcriptional and translational changes following heat stress exposure in the soil-dwelling model actinomycete bacterium, Streptomyces coelicolor. The combined analysis revealed an unprecedented level of translational control of gene expression, deduced through polysome profiling, in addition to transcriptional changes. Our data show little correlation between the transcriptome and 'translatome'; while an obvious downward trend in genome wide transcription was observed, polysome associated transcripts following heat-shock showed an opposite upward trend...
May 9, 2018: Nucleic Acids Research
https://www.readbyqxmd.com/read/29745801/cold-water-immersion-after-training-sessions-effects-on-fiber-type-specific-adaptations-in-muscle-k-transport-proteins-to-sprint-interval-training-in-men
#20
Danny Christiansen, David John Bishop, James R Broatch, Jens Bangsbo, Michael John McKenna, Robyn M Murphy
Effects of regular use of cold-water immersion (CWI) on fiber type-specific adaptations in muscle K+ transport proteins to intense training, along with their relationship to changes in mRNA levels after the first training session, were investigated in humans. Nineteen recreationally-active men (24{plus minus}6 y, 79.5{plus minus}10.8 kg, 44.6{plus minus}5.8 mL∙kg-1 ∙min-1 ) completed six weeks of sprint-interval cycling either without (passive rest; CON) or with training sessions followed by CWI (15 min at 10{degree sign}C; COLD)...
May 10, 2018: Journal of Applied Physiology
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