keyword
MENU ▼
Read by QxMD icon Read
search

amino acid starvation

keyword
https://www.readbyqxmd.com/read/27914477/in-vitro-rescue-of-genital-strains-of-chlamydia-trachomatis-from-interferon-%C3%AE-and-tryptophan-depletion-with-indole-positive-but-not-indole-negative-prevotella-spp
#1
Noa Ziklo, Wilhelmina M Huston, Kuong Taing, Mohammad Katouli, Peter Timms
BACKGROUND: The natural course of sexually transmitted infections caused by Chlamydia trachomatis varies between individuals. In addition to parasite and host effects, the vaginal microbiota might play a key role in the outcome of C. trachomatis infections. Interferon-gamma (IFN-γ), known for its anti-chlamydial properties, activates the expression of indoleamine 2,3-dioxygenase (IDO1) in epithelial cells, an enzyme that catabolizes the amino acid L- tryptophan into N-formylkynurenine, depleting the host cell's pool of tryptophan...
December 3, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27906055/mesenchymal-stem-cells-multipotent-stromal-cells-mscs-are-glycolytic-and-thus-glucose-is-a-limiting-factor-of-in-vitro-models-of-msc-starvation
#2
Austin Nuschke, Melanie Rodrigues, Albin W Wells, Kyle Sylakowski, Alan Wells
BACKGROUND: Mesenchymal stem/multipotent stromal cells (MSCs) contribute to tissue repair but are challenged during wound healing when the blood supply is disrupted, thereby limiting nutrient delivery. Survival mechanisms against 'starvation' include autophagy, which we previously found to enhance differentiation efficiency. MSC response to models of in vitro nutrient deprivation are of great interest for improving MSC survival and therapeutic efficacy; however, the rate-limiting nutrients are unknown...
December 1, 2016: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/27903898/transfer-rna-is-highly-unstable-during-early-amino-acid-starvation-in-escherichia-coli
#3
Sine Lo Svenningsen, Mette Kongstad, Thomas Søndergaard Stenum, Ana J Muñoz-Gómez, Michael A Sørensen
Due to its long half-life compared to messenger RNA, bacterial transfer RNA is known as stable RNA. Here, we show that tRNAs become highly unstable as part of Escherichia coli's response to amino acid starvation. Degradation of the majority of cellular tRNA occurs within twenty minutes of the onset of starvation for each of several amino acids. Both the non-cognate and cognate tRNA for the amino acid that the cell is starving for are degraded, and both charged and uncharged tRNA species are affected. The alarmone ppGpp orchestrates the stringent response to amino acid starvation...
November 29, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27902777/the-two-component-system-arlrs-and-alterations-in-metabolism-enable-staphylococcus-aureus-to-resist-calprotectin-induced-manganese-starvation
#4
Jana N Radin, Jessica L Kelliher, Paola K Párraga Solórzano, Thomas E Kehl-Fie
During infection the host imposes manganese and zinc starvation on invading pathogens. Despite this, Staphylococcus aureus and other successful pathogens remain capable of causing devastating disease. However, how these invaders adapt to host-imposed metal starvation and overcome nutritional immunity remains unknown. We report that ArlRS, a global staphylococcal virulence regulator, enhances the ability of S. aureus to grow in the presence of the manganese-and zinc-binding innate immune effector calprotectin...
November 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27899413/calcium-channel-regulator-mid1-links-torc2-mediated-changes-in-mitochondrial-respiration-to-autophagy
#5
Ariadne Vlahakis, Nerea Lopez Muniozguren, Ted Powers
Autophagy is a catabolic process that recycles cytoplasmic contents and is crucial for cell survival during stress. The target of rapamycin (TOR) kinase regulates autophagy as part of two distinct protein complexes, TORC1 and TORC2. TORC1 negatively regulates autophagy according to nitrogen availability. In contrast, TORC2 functions as a positive regulator of autophagy during amino acid starvation, via its target kinase Ypk1, by repressing the activity of the calcium-dependent phosphatase calcineurin and promoting the general amino acid control (GAAC) response...
November 29, 2016: Journal of Cell Biology
https://www.readbyqxmd.com/read/27895204/two-h-type-thioredoxins-interact-with-the-pho2ubiquitin-conjugating-e2-enzyme-to-fine-tune-phosphate-homeostasis
#6
Yinghui Ying, Wenhao Yue, Shoudong Wang, Shuai Li, Min Wang, Yang Zhao, Chuang Wang, Chuanzao Mao, James Whelan, Huixia Shou
Phosphate over-accumulator 2 (PHO2) encodes an ubiquitin-conjugating E2 enzyme that is a major negative regulator of the inorganic phosphate (Pi)-starvation response-signaling pathway. A yeast-two-hybrid (Y2H) screen in Oryza sativa (Os, rice) using OsPHO2 as bait, revealed an interaction between OsPHO2 and two h-type thioredoxins, OsTrxh1 and OsTrxh4. These interactions were confirmed in vivo using bimolecular fluorescence complementation (BiFC) of OsPHO2 and OsTrxh1/h4 in rice protoplasts, and by in vitro pull-down assays with 6His-tagged OsTrxh1/h4 and GST-tagged OsPHO2...
November 28, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27891833/metabolomics-guided-insights-on-bariatric-surgery-versus-behavioral-interventions-for-weight-loss
#7
REVIEW
Sara Tulipani, Jules Griffin, Magali Palau-Rodriguez, Ximena Mora-Cubillos, Rosa M Bernal-Lopez, Francisco J Tinahones, Barbara E Corkey, Cristina Andres-Lacueva
OBJECTIVE: To review the metabolomic studies carried out so far to identify metabolic markers associated with surgical and dietary treatments for weight loss in subjects with obesity. METHODS: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. RESULTS: Thirty-two studies successfully met the eligibility criteria. The metabolic adaptations shared by surgical and dietary interventions mirrored a state of starvation ketoacidosis (increase of circulating ketone bodies), an increase of acylcarnitines and fatty acid β-oxidation, a decrease of specific amino acids including branched-chain amino acids (BCAA) and (lyso)glycerophospholipids previously associated with obesity, and adipose tissue expansion...
December 2016: Obesity
https://www.readbyqxmd.com/read/27874829/in-vivo-vizualisation-of-mono-adp-ribosylation-by-dparp16-upon-amino-acid-starvation
#8
Angelica Aguilera-Gomez, Marinke M van Oorschot, Tineke Veenendaal, Catherine Rabouille
PARP catalysed ADP-ribosylation is a post-translational modification involved in several physiological and pathological processes, including cellular stress. In order to visualise both Poly-, and Mono-, ADP-ribosylation in vivo, we engineered specific fluorescent probes. Using them, we show that amino-acid starvation triggers an unprecedented display of mono-ADP-ribosylation that governs the formation of Sec body, a recently identified stress assembly that forms in Drosophila cells. We show that dPARP16 catalytic activity is necessary and sufficient for both amino-acid starvation induced mono-ADP-ribosylation and subsequent Sec body formation and cell survival...
November 22, 2016: ELife
https://www.readbyqxmd.com/read/27869123/a-systems-study-reveals-concurrent-activation-of-ampk-and-mtor-by-amino-acids
#9
Piero Dalle Pezze, Stefanie Ruf, Annika G Sonntag, Miriam Langelaar-Makkinje, Philip Hall, Alexander M Heberle, Patricia Razquin Navas, Karen van Eunen, Regine C Tölle, Jennifer J Schwarz, Heike Wiese, Bettina Warscheid, Jana Deitersen, Björn Stork, Erik Fäßler, Sascha Schäuble, Udo Hahn, Peter Horvatovich, Daryl P Shanley, Kathrin Thedieck
Amino acids (aa) are not only building blocks for proteins, but also signalling molecules, with the mammalian target of rapamycin complex 1 (mTORC1) acting as a key mediator. However, little is known about whether aa, independently of mTORC1, activate other kinases of the mTOR signalling network. To delineate aa-stimulated mTOR network dynamics, we here combine a computational-experimental approach with text mining-enhanced quantitative proteomics. We report that AMP-activated protein kinase (AMPK), phosphatidylinositide 3-kinase (PI3K) and mTOR complex 2 (mTORC2) are acutely activated by aa-readdition in an mTORC1-independent manner...
November 21, 2016: Nature Communications
https://www.readbyqxmd.com/read/27855785/sec24-phosphorylation-regulates-autophagosome-abundance-during-nutrient-deprivation
#10
Saralin Davis, Juan Wang, Ming Zhu, Kyle Stahmer, Ramya Lakshminarayan, Majid Ghassemian, Yu Jiang, Elizabeth A Miller, Susan Ferro-Novick
Endoplasmic Reticulum (ER)-derived COPII coated vesicles constitutively transport secretory cargo to the Golgi. However, during starvation-induced stress, COPII vesicles have been implicated as a membrane source for autophagosomes, distinct organelles that engulf cellular components for degradation by macroautophagy (hereafter called autophagy). How cells regulate core trafficking machinery to fulfill dramatically different cellular roles in response to environmental cues is unknown. Here we show that phosphorylation of conserved amino acids on the membrane-distal surface of the Saccharomyces cerevisiae COPII cargo adaptor, Sec24, reprograms COPII vesicles for autophagy...
November 18, 2016: ELife
https://www.readbyqxmd.com/read/27833594/candida-species-rewired-hyphae-developmental-programs-for-chlamydospore-formation
#11
Bettina Böttcher, Christine Pöllath, Peter Staib, Bernhard Hube, Sascha Brunke
Chlamydospore formation is a characteristic of many fungal species, among them the closely related human-pathogenic dimorphic yeasts Candida albicans and C. dubliniensis. Whereas function and regulation of filamentation are well-studied in these species, the basis of chlamydospore formation is mostly unknown. Here, we investigate the contribution of environmental and genetic factors and identified central proteins involved in species-specific regulation of chlamydosporulation. We show that specific nutrient levels strongly impact chlamydospore initiation, with starvation favoring sporulation and elevated levels of saccharides or peptone inhibiting it...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27823863/identification-of-degradation-routes-of-metamitron-in-soil-microcosms-using-13-c-isotope-labeling
#12
Shizong Wang, Anja Miltner, Karolina M Nowak
Metamitron is one of the most commonly used herbicide in sugar beet and flower bulb cultures. Numerous laboratory and field studies on sorption and degradation of metamitron were performed. Detailed biodegradation studies in soil using (13)C-isotope labeling are still missing. Therefore, we aimed at providing a detailed turnover mass balance of (13)C6-metamitron in soil microcosms over 80 days. In the biotic system, metamitron mineralized rapidly, and (13)CO2 finally constituted 60% of the initial (13)C6-metamitron equivalents...
November 4, 2016: Environmental Pollution
https://www.readbyqxmd.com/read/27811061/liver-p53-is-stabilized-upon-starvation-and-required-for-amino-acid-catabolism-and-gluconeogenesis
#13
Andreas Prokesch, Franziska A Graef, Tobias Madl, Jennifer Kahlhofer, Steffi Heidenreich, Anne Schumann, Elisabeth Moyschewitz, Petra Pristoynik, Astrid Blaschitz, Miriam Knauer, Matthias Muenzner, Juliane G Bogner-Strauss, Gottfried Dohr, Tim J Schulz, Michael Schupp
The ability to adapt cellular metabolism to nutrient availability is critical for survival. The liver plays a central role in the adaptation to starvation by switching from glucose-consuming processes and lipid synthesis to providing energy substrates like glucose to the organism. Here we report a previously unrecognized role of the tumor suppressor p53 in the physiologic adaptation to food withdrawal. We found that starvation robustly increases p53 protein in mouse liver. This induction was posttranscriptional and mediated by a hepatocyte-autonomous and AMP-activated protein kinase-dependent mechanism...
November 3, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/27809283/effect-of-high-carbohydrate-diet-on-plasma-metabolome-in-mice-with-mitochondrial-respiratory-chain-complex-iii-deficiency
#14
Jayasimman Rajendran, Nikica Tomašić, Heike Kotarsky, Eva Hansson, Vidya Velagapudi, Jukka Kallijärvi, Vineta Fellman
Mitochondrial disorders cause energy failure and metabolic derangements. Metabolome profiling in patients and animal models may identify affected metabolic pathways and reveal new biomarkers of disease progression. Using liver metabolomics we have shown a starvation-like condition in a knock-in (Bcs1l(c.232A>G)) mouse model of GRACILE syndrome, a neonatal lethal respiratory chain complex III dysfunction with hepatopathy. Here, we hypothesized that a high-carbohydrate diet (HCD, 60% dextrose) will alleviate the hypoglycemia and promote survival of the sick mice...
November 1, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27791183/p62-and-ubiquitin-dependent-stress-induced-autophagy-of-the-mammalian-26s-proteasome
#15
Victoria Cohen-Kaplan, Ido Livneh, Noa Avni, Bertrand Fabre, Tamar Ziv, Yong Tae Kwon, Aaron Ciechanover
The ubiquitin-proteasome system and autophagy are the two main proteolytic systems involved in, among other functions, the maintenance of cell integrity by eliminating misfolded and damaged proteins and organelles. Both systems remove their targets after their conjugation with ubiquitin. An interesting, yet incompletely understood problem relates to the fate of the components of the two systems. Here we provide evidence that amino acid starvation enhances polyubiquitination on specific sites of the proteasome, a modification essential for its targeting to the autophagic machinery...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27775676/identification-characterization-and-expression-of-methuselah-like-genes-in-dastarcus-helophoroides-coleoptera-bothrideridae
#16
Zhengqing Zhang, Huapeng Wang, Chunfeng Hao, Wei Zhang, Miaomiao Yang, Yong Chang, Menglou Li
Dastarcus helophoroides, which has a relatively longer lifespan compared to other insects, is one of the most effective natural enemies of many large-body long-horned beetles. Methuselah (Mth) is associated with the lifespan, stress resistance, and reproduction in Drosophila melanogaster, but Mth is not present in non-drosophiline insects. A number of methuselah-like genes (mth-likes, mthls) have been identified in non-drosophiline insects, but it is still unknown whether they are present in Dastarcus helophoroides...
October 21, 2016: Genes
https://www.readbyqxmd.com/read/27770033/chromatin-association-of-gcn4-is-limited-by-post-translational-modifications-triggered-by-its-dna-binding-in-saccharomyces-cerevisiae
#17
Akhi Akhter, Emanuel Rosonina
The Saccharomyces cerevisiae transcription factor Gcn4 is expressed during amino acid starvation and its abundance is controlled by ubiquitin-mediated proteolysis. Cdk8, a kinase component of the RNA polymerase II Mediator complex, phosphorylates Gcn4 which triggers its ubiquitination/proteolysis and is thought to link Gcn4 degradation with transcription of target genes. In addition to phosphorylation and ubiquitination, we previously showed that Gcn4 becomes sumoylated in a DNA-binding dependent manner, while a non-sumoylatable form of Gcn4 showed increased chromatin occupancy, but only if Cdk8 was present...
October 21, 2016: Genetics
https://www.readbyqxmd.com/read/27747870/amino-acid-transporter-slc6a14-is-a-novel-and-effective-drug-target-for-pancreatic-cancer
#18
V Coothankandaswamy, S Cao, Y Xu, P D Prasad, P K Singh, C P Reynolds, S Yang, J Ogura, V Ganapathy, Y D Bhutia
BACKGROUND AND PURPOSE: Pancreatic cancer is a solid tumour that is often fatal. Hence, there is an urgent need to identify new drug targets for this disease. Highly proliferating cancer cells have an increased demand for nutrients and, therefore, need to up-regulate selective amino acid transporters. Here, we investigated which amino acid transporters are up-regulated in pancreatic cancer and whether any of these transporters has potential as a drug target for this fatal disease. EXPERIMENTAL APPROACH: The expression of amino acid transporters in pancreatic cancer was analysed using publicly available microarray datasets, and the findings with the transporter SLC6A14 were validated by mRNA and protein analysis...
October 17, 2016: British Journal of Pharmacology
https://www.readbyqxmd.com/read/27736949/metabolome-analysis-reveals-betaine-lipids-as-major-source-for-triglyceride-formation-and-the-accumulation-of-sedoheptulose-during-nitrogen-starvation-of-phaeodactylum-tricornutum
#19
Jennifer Popko, Cornelia Herrfurth, Kirstin Feussner, Till Ischebeck, Tim Iven, Richard Haslam, Mary Hamilton, Olga Sayanova, Jonathan Napier, Inna Khozin-Goldberg, Ivo Feussner
Oleaginous microalgae are considered as a promising resource for the production of biofuels. Especially diatoms arouse interest as biofuel producers since they are most productive in carbon fixation and very flexible to environmental changes in the nature. Naturally, triacylglycerol (TAG) accumulation in algae only occurs under stress conditions like nitrogen-limitation. We focused on Phaeodactylum strain Pt4 (UTEX 646), because of its ability to grow in medium with low salinity and therefore being suited when saline water is less available or for wastewater cultivation strategies...
2016: PloS One
https://www.readbyqxmd.com/read/27733118/genome-wide-analysis-of-autophagy-associated-genes-in-foxtail-millet-setaria-italica-l-and-characterization-of-the-function-of-siatg8a-in-conferring-tolerance-to-nitrogen-starvation-in-rice
#20
Weiwei Li, Ming Chen, Erhui Wang, Liqin Hu, Malcolm J Hawkesford, Li Zhong, Zhu Chen, Zhaoshi Xu, Liancheng Li, Yongbin Zhou, Changhong Guo, Youzhi Ma
BACKGROUND: Autophagy is a cellular degradation process that is highly evolutionarily-conserved in yeast, plants, and animals. In plants, autophagy plays important roles in regulating intracellular degradation and recycling of amino acids in response to nutrient starvation, senescence, and other environmental stresses. Foxtail millet (Setaria italica) has strong resistance to stresses and has been proposed as an ideal material for use in the study of the physiological mechanisms of abiotic stress tolerance in plants...
October 12, 2016: BMC Genomics
keyword
keyword
109294
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"