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amino acid starvation

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https://www.readbyqxmd.com/read/28710039/cloning-expression-pattern-and-potential-role-of-apoptosis-inhibitor-5-in-the-termination-of-embryonic-diapause-and-early-embryo-development-of-artemia-sinica
#1
Shuang Zhang, Feng Yao, Ting Jing, Mengchen Zhang, Wei Zhao, Xiangyang Zou, Linlin Sui, Lin Hou
During the embryonic development of Artemia sinica, the diapause phenomenon can be induced by high salinity or low temperature conditions. The diapause embryo at the gastrula stage is maintained under the threat of apoptosis to guarantee the embryo's normal development. In this process, apoptosis inhibitor proteins play vital roles in protecting embryos against apoptosis. Apoptosis inhibitor5 (API5) plays a pivotal role in regulating the cell cycle and preventing programmed cell death after growth factor starvation...
July 11, 2017: Gene
https://www.readbyqxmd.com/read/28700931/feedback-inhibition-of-the-rag-gtpase-gap-complex-lst4-lst7-safeguards-torc1-from-hyperactivation-by-amino-acid-signals
#2
Marie-Pierre Péli-Gulli, Serena Raucci, Zehan Hu, Jörn Dengjel, Claudio De Virgilio
Amino acids stimulate the eukaryotic target of rapamycin complex 1 (TORC1), and hence growth, through the Rag GTPases and their regulators. Among these, the yeast Lst4-Lst7 Rag GTPase GAP complex clusters, as we previously reported, at the vacuolar membrane upon amino acid starvation. In response to amino acid refeeding, it activates the Rag GTPase-TORC1 branch and is then dispersed from the vacuolar surface. Here, we show that the latter effect is driven by TORC1 itself, which directly phosphorylates several residues within the intra-DENN loop of Lst4 that, only in its non-phosphorylated state, tethers the Lst4-Lst7 complex to the vacuolar membrane...
July 11, 2017: Cell Reports
https://www.readbyqxmd.com/read/28690600/differential-growth-of-francisella-tularensis-which-alters-expression-of-virulence-factors-dominant-antigens-and-surface-carbohydrate-synthases-governs-the-apparent-virulence-of-ft-schus4-to-immunized-animals
#3
Kristen M Holland, Sarah J Rosa, Kolbrun Kristjansdottir, Donald Wolfgeher, Brian J Franz, Tiffany M Zarrella, Sudeep Kumar, Raju Sunagar, Anju Singh, Chandra S Bakshi, Prachi Namjoshi, Eileen M Barry, Timothy J Sellati, Stephen J Kron, Edmund J Gosselin, Douglas S Reed, Karsten R O Hazlett
The gram-negative bacterium Francisella tularensis (Ft) is both a potential biological weapon and a naturally occurring microbe that survives in arthropods, fresh water amoeba, and mammals with distinct phenotypes in various environments. Previously, we used a number of measurements to characterize Ft grown in Brain-Heart Infusion (BHI) broth as (1) more similar to infection-derived bacteria, and (2) slightly more virulent in naïve animals, compared to Ft grown in Mueller Hinton Broth (MHB). In these studies we observed that the free amino acids in MHB repress expression of select Ft virulence factors by an unknown mechanism...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28668976/abscisic-acid-regulated-protein-degradation-causes-osmotic-stress-induced-accumulation-of-branched-chain-amino-acids-in-arabidopsis-thaliana
#4
Tengfang Huang, Georg Jander
Whereas proline accumulates through de novo biosynthesis in plants subjected to osmotic stress, leucine, isoleucine, and valine accumulation in drought-stressed Arabidopsis thaliana is caused by abscisic acid-regulated protein degradation. In response to several kinds of abiotic stress, plants greatly increase their accumulation of free amino acids. Although stress-induced proline increases have been studied the most extensively, the fold-increase of other amino acids, in particular branched-chain amino acids (BCAAs; leucine, isoleucine, and valine), is often higher than that of proline...
July 1, 2017: Planta
https://www.readbyqxmd.com/read/28655822/translation-initiation-from-conserved-non-aug-codons-provides-additional-layers-of-regulation-and-coding-capacity
#5
Ivaylo P Ivanov, Jiajie Wei, Stephen Z Caster, Kristina M Smith, Audrey M Michel, Ying Zhang, Andrew E Firth, Michael Freitag, Jay C Dunlap, Deborah Bell-Pedersen, John F Atkins, Matthew S Sachs
Neurospora crassa cpc-1 and Saccharomyces cerevisiae GCN4 are homologs specifying transcription activators that drive the transcriptional response to amino acid limitation. The cpc-1 mRNA contains two upstream open reading frames (uORFs) in its >700-nucleotide (nt) 5' leader, and its expression is controlled at the level of translation in response to amino acid starvation. We used N. crassa cell extracts and obtained data indicating that cpc-1 uORF1 and uORF2 are functionally analogous to GCN4 uORF1 and uORF4, respectively, in controlling translation...
June 27, 2017: MBio
https://www.readbyqxmd.com/read/28652262/identification-and-metabolite-profiling-of-chemical-activators-of-lipid-accumulation-in-green-algae
#6
Nishikant Wase, Boqiang Tu, James W Allen, Paul N Black, Concetta C DiRusso
Microalgae are proposed as feedstock organisms useful for producing biofuels and co-products. However, several limitations must be overcome before algae-based production is economically feasible. Among these is the ability to induce lipid accumulation and storage without affecting biomass yield. To overcome this barrier, a chemical genetics approach was employed in which 43,783 compounds were screened against Chlamydomonas reinhardtii and 243 compounds were identified that increase triacylglyceride (TAG) accumulation without terminating growth...
June 26, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28596215/reproductive-and-metabolic-state-differences-in-olfactory-responses-to-amino-acids-in-a-mouth-brooding-african-cichlid-fish
#7
Alexandre A Nikonov, Julie M Butler, Karen E Field, John Caprio, Karen P Maruska
Olfaction mediates many crucial life-history behaviors such as prey detection, predator avoidance, migration, and reproduction. Olfactory function can also be modulated by an animal's internal physiological and metabolic states. While this is relatively well-studied in mammals, little is known about how internal state impacts olfaction in fishes, the largest and most diverse group of vertebrates. Here we apply electro-olfactograms (EOGs) in the African cichlid fish Astatotilapia burtoni to test the hypothesis that olfactory responses to food-related cues (i...
June 8, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28593971/nutrient-acquisition-strategies-of-mammalian-cells
#8
Wilhelm Palm, Craig B Thompson
Mammalian cells are surrounded by diverse nutrients, such as glucose, amino acids, various macromolecules and micronutrients, which they can import through transmembrane transporters and endolysosomal pathways. By using different nutrient sources, cells gain metabolic flexibility to survive periods of starvation. Quiescent cells take up sufficient nutrients to sustain homeostasis. However, proliferating cells depend on growth-factor-induced increases in nutrient uptake to support biomass formation. Here, we review cellular nutrient acquisition strategies and their regulation by growth factors and cell-intrinsic nutrient sensors...
June 7, 2017: Nature
https://www.readbyqxmd.com/read/28592812/activity-independent-targeting-of-mtor-to-lysosomes-in-primary-osteoclasts
#9
Andrew Wang, Luciene R Carraro-Lacroix, Celeste Owen, Bowen Gao, Paul N Corey, Pascal Tyrrell, John H Brumell, Irina Voronov
Mammalian target of rapamycin (mTOR) is activated by numerous stimuli, including amino acids and growth factors. This kinase is part of the mTOR complex 1 (mTORC1) which regulates cell proliferation, differentiation, and autophagy. Active mTORC1 is located on lysosomes and has been reported to disassociate from the lysosomal surface in the absence of amino acids. Furthermore, mTORC1 activity has been linked to the vacuolar H(+)-ATPases (V-ATPases), the proton pumps responsible for lysosomal acidification; however, the exact role of the V-ATPases in mTORC1 signaling is not known...
June 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28588606/mutations-in-the-not-genes-or-in-the-translation-machinery-similarly-display-increased-resistance-to-histidine-starvation
#10
Martine A Collart, Sari Kassem, Zoltan Villanyi
The NOT genes encode subunits of the conserved Ccr4-Not complex, a global regulator of gene expression, and in particular of mRNA metabolism. They were originally identified in a selection for increased resistance to histidine starvation in the yeast S. cerevisiae. Recent work indicated that the Not5 subunit, ortholog of mammalian CNOT3, determines global translation levels by defining binding of the Ccr4-Not scaffold protein Not1 to ribosomal mRNAs during transcription. This is needed for optimal translation of ribosomal proteins...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28566325/persistent-mtorc1-signaling-in-cell-senescence-results-from-defects-in-amino-acid-and-growth-factor-sensing
#11
Bernadette Carroll, Glyn Nelson, Yoana Rabanal-Ruiz, Olena Kucheryavenko, Natasha A Dunhill-Turner, Charlotte C Chesterman, Qabil Zahari, Tong Zhang, Sarah E Conduit, Christina A Mitchell, Oliver D K Maddocks, Penny Lovat, Thomas von Zglinicki, Viktor I Korolchuk
Mammalian target of rapamycin complex 1 (mTORC1) and cell senescence are intimately linked to each other and to organismal aging. Inhibition of mTORC1 is the best-known intervention to extend lifespan, and recent evidence suggests that clearance of senescent cells can also improve health and lifespan. Enhanced mTORC1 activity drives characteristic phenotypes of senescence, although the underlying mechanisms responsible for increased activity are not well understood. We have identified that in human fibroblasts rendered senescent by stress, replicative exhaustion, or oncogene activation, mTORC1 is constitutively active and resistant to serum and amino acid starvation...
July 3, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28562106/enteral-nutrition-in-pediatric-intestinal-failure-does-initial-feeding-impact-on-intestinal-adaptation
#12
Teresa Capriati, Valerio Nobili, Laura Stronati, Salvatore Cucchiara, Francesca Laureti, Alessandra Liguori, Elaine Tyndall, Antonella Diamanti
Primary IF can be due to impaired gut length or impaired gut function; short bowel syndrome (SBS) is the leading cause of IF. In IF patients complete enteral starvation should be avoided whenever possible and enteral/oral nutrition (EN/ON) should be employed at the maximum tolerated amount in each phase of the clinical evolution of IF. Intraluminal nutrients have stimulatory effects on epithelial cells and on trophism that enhance intestinal adaptation. Areas covered: Evidence for nutritional interventions in pediatric IF is limited and of poor quality...
June 8, 2017: Expert Review of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28558053/novel-mrna-specific-effects-of-ribosome-drop-off-on-translation-rate-and-polysome-profile
#13
Pierre Bonnin, Norbert Kern, Neil T Young, Ian Stansfield, M Carmen Romano
The well established phenomenon of ribosome drop-off plays crucial roles in translational accuracy and nutrient starvation responses during protein translation. When cells are under stress conditions, such as amino acid starvation or aminoacyl-tRNA depletion due to a high level of recombinant protein expression, ribosome drop-off can substantially affect the efficiency of protein expression. Here we introduce a mathematical model that describes the effects of ribosome drop-off on the ribosome density along the mRNA and on the concomitant protein synthesis rate...
May 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28557005/sarcopenia-in-alcoholic-liver-disease-clinical-and-molecular-advances
#14
REVIEW
Jaividhya Dasarathy, Arthur J McCullough, Srinivasan Dasarathy
Despite advances in treatment of alcohol use disorders that focus on increasing abstinence and reducing recidivism, alcoholic liver disease (ALD) is projected to be the major cause of cirrhosis and its complications. Malnutrition is recognized as the most frequent complication in ALD, and despite the high clinical significance, there are no effective therapies to reverse malnutrition in ALD. Malnutrition is a relatively imprecise term, and sarcopenia or skeletal muscle loss, the major component of malnutrition, is primarily responsible for the adverse clinical consequences in patients with liver disease...
May 29, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28536785/significance-of-accumulation-of-the-alarmone-p-ppgpp-in-chloroplasts-for-controlling-photosynthesis-and-metabolite-balance-during-nitrogen-starvation-in-arabidopsis
#15
Rina Honoki, Sumire Ono, Akira Oikawa, Kazuki Saito, Shinji Masuda
The regulatory nucleotides, guanosine 5'-triphosphate 3'-diphosphate (pppGpp) and guanosine 5'-diphosphate 3'-diphosphate (ppGpp), were originally identified in Escherichia coli, and control a large set of gene expression and enzyme activities. The (p)ppGpp-dependent control of cell activities is referred to as the stringent response. A growing number of (p)ppGpp synthase/hydrolase homologs have been identified in plants, which are localized in plastids in Arabidopsis thaliana. We recently reported that the Arabidopsis mutant overproducing ppGpp in plastids showed dwarf chloroplasts, and transcript levels in the mutant plastids were significantly suppressed...
May 23, 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28536474/gcn2-phosphorylates-hiv-1-integrase-and-decreases-hiv-1-replication-by-limiting-viral-integration
#16
A Jaspart, C Calmels, O Cosnefroy, P Bellecave, P Pinson, S Claverol, V Guyonnet-Dupérat, B Dartigues, M S Benleulmi, E Mauro, P A Gretteau, V Parissi, M Métifiot, M L Andreola
GCN2 is a serine/threonine kinase involved in cellular stress response related to amino acid starvation. Previously, we showed that GCN2 interacts with HIV-1 integrase and is activated during HIV-1 infection. Herein, we identified HIV-1 integrase as a previously unknown substrate of GCN2 in vitro with a major site of phosphorylation at residue S255 located in the C-terminal domain of HIV-1 integrase. The underlying mechanism was investigated and it appeared that the integrase active site was required in order for GCN2 to target the integrase residue S255...
May 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28529125/the-evidence-of-apelin-has-the-bidirectional-effects-on-feeding-regulation-in-siberian-sturgeon-acipenser-baerii
#17
Jin Hao, Qing Liu, Xin Zhang, Yuanbing Wu, Jieyao Zhu, Jinwen Qi, Ni Tang, Shuyao Wang, Hong Wang, Defang Chen, Zhiqiong Li
Apelin is a peptide, mainly produced in the brain, which participates in several physiologic effects. However, knowledge about the mechanism of appetite regulation in teleosts, including the role of apelin is not well understood. The aim of this study is to explore the effect of feeding status on the expression of apelin mRNA in the whole brain and the effects of injection of apelin on food intake in Siberian sturgeon (Acipenser baerii). In this study, we first cloned the apelin cDNA sequence of the Siberian sturgeon...
May 19, 2017: Peptides
https://www.readbyqxmd.com/read/28526057/recognition-of-a-structural-domain-rwdbd-in-gcn1-proteins-that-interacts-with-the-rwd-domain-containing-proteins
#18
Ramachandran Rakesh, Rangachari Krishnan, Evelyn Sattlegger, Narayanaswamy Srinivasan
The protein Gcn1 (General control non-derepressible 1) is found in virtually all eukaryotes, and is a key component of the general amino acid control signal transduction pathway. This pathway is best known for its importance for cells to sense and overcome amino acid starvation. Gcn1 directly binds to the RWD (RING finger-containing proteins, WD-repeat-containing proteins, and yeast DEAD (DEXD)-like helicases) domain of the protein kinase Gcn2, and this is essential for delivering the starvation signal to Gcn2...
May 19, 2017: Biology Direct
https://www.readbyqxmd.com/read/28495867/sex-differences-in-the-utilization-of-essential-and-non-essential-amino-acids-in-a-lepidoptera
#19
Eran Levin, Marshall D McCue, Goggy Davidowitz
The different reproductive strategies of males and females underlie differences in behavior that may also lead to differences in nutrient use between the two sexes. We study sex differences in the utilization of two essential amino acids (EAAs) and one non-essential amino-acid (NEAA) by the Carolina sphinx moth (Manduca sexta). On day one post-eclosion from the pupae, adult male moths oxidized greater amounts of larval-derived AAs than females, and more nectar derived AAs after feeding. After four days of starvation the opposite pattern was observed; adult females oxidized more larval-derived AAs than males...
May 11, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28486929/ulk1-phosphorylates-sec23a-and-mediates-autophagy-induced-inhibition-of-er-to-golgi-traffic
#20
Wenjia Gan, Caiyun Zhang, Ka Yu Siu, Ayano Satoh, Julian A Tanner, Sidney Yu
BACKGROUND: Autophagy is an inducible autodigestive process that allows cells to recycle proteins and other materials for survival during stress and nutrient deprived conditions. The kinase ULK1 is required to activate this process. ULK1 phosphorylates a number of target proteins and regulates many cellular processes including the early secretory pathway. Recently, ULK1 has been demonstrated to phosphorylate Sec16 and affects the transport of serotonin transporter at the ER exit sites (ERES), but whether ULK1 may affect the transport of other cargo proteins and general secretion has not been fully addressed...
May 10, 2017: BMC Cell Biology
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