84,812 results match your criteria key amino

Distal lysine (de)coordination in the algal hemoglobin THB1: A combined computer simulation and experimental study.

J Inorg Biochem 2021 Apr 5;220:111455. Epub 2021 Apr 5.

Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina. Electronic address:

THB1 is a monomeric truncated hemoglobin from the green alga Chlamydomonas reinhardtii. In the absence of exogenous ligands and at neutral pH, the heme group of THB1 is coordinated by two protein residues, Lys53 and His77. THB1 is thought to function as a nitric oxide dioxygenase, and the distal binding of O requires the cleavage of the Fe-Lys53 bond accompanied by protonation and expulsion of the lysine from the heme cavity into the solvent. Read More

View Article and Full-Text PDF

Hydroxytyrosol as anti-parkinsonian molecule: Assessment using in-silico and MPTP-induced Parkinson's disease model.

Biomed Pharmacother 2021 Apr 18;139:111525. Epub 2021 Apr 18.

Department of Biochemistry, Basic Medical Sciences Block-II, Panjab University, Chandigarh 160014, India. Electronic address:

3-Hydroxytyrosol (HXT) is a natural polyphenol present in extra virgin olive oil. It is a key component of Mediterranean diet and is known for its strong antioxidant activity. The present study evaluated the potential of HXT as an anti-parkinsonian molecule in terms of its ability to inhibit MAO-B and thereby maintaining dopamine (DA) levels in Parkinson's disease (PD). Read More

View Article and Full-Text PDF

Molecular cloning, Immunological Characterization, and expression analysis of Gonadotropin-releasing hormone (GnRH) in the brain of the Chinese alligator during different stages of reproductive cycle.

Gene 2021 Apr 18:145672. Epub 2021 Apr 18.

Key Laboratory for Conservation and Use of Important Biological Resources of Anhui Province, College of Life Sciences, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China. Electronic address:

The neurohormone gonadotropin-releasing hormone (GnRH) plays an essential role in the control of reproductive functions in vertebrates. However, the full-length complementary DNA (cDNA) encoding the GnRHs precursor and it role in the reproductive cycles regulating has not been illustrated in crocodilian species. In the present study, full-length cDNAs encoding GnRH1 forms, its predominant localization within brain and peripheral tissues, and GnRH1 peptide concentrations in the hypothalamus and pituitary in relation to seasonal gonadal development of Chinese alligator were investigated. Read More

View Article and Full-Text PDF

First mitogenome of subfamily Langiinae (Lepidoptera: Sphingidae) with its phylogenetic implications.

Gene 2021 Apr 18:145667. Epub 2021 Apr 18.

Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu, Anhui 241000, China. Electronic address:

To date, a relatively complete classification of Sphingidae (Lepidoptera) has been generated, but the phylogeny of the family remains need to be fully resolved. Some phylogenetic relationships within Sphingidae still remains uncertain, especially the taxonomic status of the subfamily Langiinae and its sole included genus and species, Langia zenzeroides. To begin to address this problem, we generated nine new complete mitochondrial genomes, including that of Langia, and together with that of Theretra oldenlandiae from our previous study and 25 other Sphingidae mitogenomes downloaded from GenBank, analyzed the phylogenetic relationships of Sphingidae and investigated the mitogenomic differences among members of the Langiinae, Sphinginae, Smerinthinae and Macroglossinae. Read More

View Article and Full-Text PDF

Metabolic patterns in Septoria canker resistant and susceptible Populus trichocarpa genotypes 24 hours post-inoculation.

Phytopathology 2021 Apr 21. Epub 2021 Apr 21.

2062 Cordely HallCorvallis, Oregon, United States, 97331;

Sphaerulina musiva is an economically and ecologically important fungal pathogen that causes Septoria stem canker and leaf spot disease of Populus species. To bridge the gap between genetic markers and structural barriers previously found to be linked to Septoria (Sphaerulina musiva) canker disease resistance in poplar, we employed hydrophilic interaction liquid chromatography (HILIC) and tandem mass spectrometry (MS/MS) to identify and quantify metabolites involved with signaling and cell wall re-modelling. Fluctuations in signaling molecules, organic acids, amino acids, sterols, phenolics, and saccharides in resistant and susceptible Populus trichocarpa inoculated with Sphaerulina musiva, were observed. Read More

View Article and Full-Text PDF

Copper and Selenium stimulates CYP19A1 expression in caprine ovarian granulosa cells: possible involvement of AKT and WNT signalling pathways.

Mol Biol Rep 2021 Apr 21. Epub 2021 Apr 21.

Animal Biotechnology Lab, ICAR-National Institute of Animal Nutrition and Physiology (NIANP), Bengaluru, Karnataka, India.

The role of copper and selenium on activation of estradiol synthesis pathways viz. PKA/AKT/WNT is not clearly elucidated. On this background we attempt to elcuiated the role of copper and selenium on mRNA expression of genes associated with estradiol synthesis in caprine ovarian granulose cell models. Read More

View Article and Full-Text PDF

Endogenous cortisol excess confers a unique lipid signature and metabolic network.

J Mol Med (Berl) 2021 Apr 21. Epub 2021 Apr 21.

Group of Endocrine Disorders, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Carrer Rosselló, 149, 08036, Barcelona, Spain.

Chronic cortisol excess induces several alterations on protein, lipid and carbohydrate metabolism resembling those found in the metabolic syndrome. However, patients exposed to prolonged high levels of cortisol in Cushing syndrome (CS) present exceeding cardiometabolic alterations not reflected by conventional biomarkers. Using 3 ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS) platforms, we aimed to characterise the serum metabolome of 25 patients with active endogenous CS and 25 control subjects matched by propensity score (sex, BMI, diabetes mellitus type 2 (T2D), high blood pressure (HBP) and dyslipidaemia) to search for potential disease-specific biomarkers and pathways associated to the clinical comorbidities. Read More

View Article and Full-Text PDF

N-terminal deletion of specific phosphorylation sites on PHOX2B disrupts the formation of enteric neurons in vivo.

Am J Physiol Gastrointest Liver Physiol 2021 Apr 21. Epub 2021 Apr 21.

Surgery, Children's Hospital of Los Angeles, United States.

Mutations in the paired-like homeobox 2b (PHOX2B) gene are associated with congenital central hypoventilation syndrome (CCHS), which is a rare condition in which both autonomic dysregulation with hypoventilation and an enteric neuropathy may occur. The majority of CCHS patients have a polyalanine repeat mutation (PARM) in PHOX2B, but a minority of patients have non-polyalanine repeat mutations (NPARM), some of which have been localized to exon 1. A PHOX2B-Y14X nonsense mutation previously generated in a human pluripotent stem cell (hPSC) line results in an N-terminus truncated product missing the first 17 or 20 amino acids, possibly due to translational reinitiation at an alternate ATG start site. Read More

View Article and Full-Text PDF

Tissue metabolic profiling reveals major metabolic alteration in colorectal cancer.

Mol Omics 2021 Apr 20. Epub 2021 Apr 20.

The State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, The Fourth Military Medical University, Xi'an, 710032, China.

Metabolic reprogramming is a hallmark of cancer, which is still far from being fully understood in colorectal cancer. In order to characterize the metabolic changes in colorectal cancer, we performed metabolomics analysis of paired colon tissues from colorectal cancer patients by using a liquid chromatography-mass spectrometry (LC-MS)-based method. Bioinformation analysis was used to define important metabolites and metabolic pathways, as well as the prognosis significance and expression levels of the key molecules. Read More

View Article and Full-Text PDF

Label-free proteomic analysis revealed the mechanisms of protein oxidation induced by hydroxyl radicals in whiteleg shrimp () muscle.

Food Funct 2021 Apr 21. Epub 2021 Apr 21.

Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, College of Food Science and Pharmacy, Zhejiang Ocean University, China.

The oxidative effects of hydroxyl radicals derived from a FeCl3/ascorbic acid/H2O2 system on the stability of muscle proteins in peeled shrimp (Litopenaeus vannamei) were investigated. Physicochemical analysis indicated negative effects on the color (a* value), springiness, and pH of shrimp muscle, which appeared to be significantly exacerbated by higher concentrations of generated hydroxyl radicals when compared with the control. The microstructural results confirmed that a radical attack induced the incompact structure and disintegrated myofibers, thereby leading to weakened connective tissues and decreased stability of muscle proteins. Read More

View Article and Full-Text PDF

High regio- and stereoselective multi-enzymatic synthesis of all phenylpropanolamine stereoisomers from β-methylstyrene.

Chembiochem 2021 Apr 21. Epub 2021 Apr 21.

University of Amsterdam, van't Hoff Institute for Molecular Sciences, Science Park 904, 1098 XH, Amsterdam, NETHERLANDS.

We present a one-pot multi-enzyme cascade for the synthesis of phenylpropanolamines (PPAs) in high optical purities (er and dr up to >99.5%) and yields (up to 95%) by using 1-phenylpropane-1,2-diols as key intermediates. This bioamination entails the combination of an alcohol dehydrogenase (ADH), an ω-transaminase (ωTA) and an alanine dehydrogenase to create a redox-neutral network, which harnesses the exquisite and complementary regio- and stereo-selectivities of the selected ADHs and ωTAs. Read More

View Article and Full-Text PDF

Biorecovery of nanogold and nanogold compounds from gold-containing ores and industrial wastes.

Appl Microbiol Biotechnol 2021 Apr 20. Epub 2021 Apr 20.

Technical Faculty in Bor, University of Belgrade, Vojske Jugoslavije 12, Bor, 19210, Serbia.

In nature, microorganisms developed at various places and adapted to the various weather and geological conditions. Microorganisms participate in geological transformations leading to the dissolution of some minerals and conversion to others. While some microorganisms with their metabolic activity increase the mobility of metals, others cause precipitation of metals and the formation of new minerals. Read More

View Article and Full-Text PDF

Visceral myopathy diagnosed by a de novo mutation in a patient with chronic intestinal pseudo-obstruction-a case report.

Transl Pediatr 2021 Mar;10(3):679-685

Department of Pediatric Intensive Care Unit, Chongqing Medical University Affiliated Children's Hospital; National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, China International Science and Technology Cooperation Base of Child Development and Critical Disorders; Chongqing Key Laboratory of Pediatrics, Chongqing, China.

Visceral myopathy is a rare genetic disorder that commonly affects the digestive and renal systems. Manifestations include a clinical spectrum covering chronic intestinal pseudo-obstruction (CIPO) and megacystis-microcolon-intestinal hypoperistalsis syndrome (MMIHS). The smooth muscle actin γ-2 gene () is one of the most common disease-causing genes. Read More

View Article and Full-Text PDF

Late gestation fetal hyperglucagonemia impairs placental function and results in diminished fetal protein accretion and decreased fetal growth.

J Physiol 2021 Apr 20. Epub 2021 Apr 20.

University of Colorado Anschutz Medical Campus, Aurora, CO, United States.

Key Points: Fetal glucagon concentrations are elevated in the setting of placental insufficiency, hypoxia, and elevated stress hormones. Chronically elevated glucagon concentrations in the adult result in profound decreases in amino acid concentrations and lean body mass. Experimental elevation of fetal glucagon concentrations in a late-gestation pregnant sheep results in lower fetal amino acid concentrations, lower protein accretion, and lower fetal weight, in addition to decreased placental function. Read More

View Article and Full-Text PDF

An optimized analog of antimicrobial peptide Jelleine-1 shows enhanced antimicrobial activity against multidrug resistant P. aeruginosa and negligible toxicity in vitro and in vivo.

Eur J Med Chem 2021 Apr 7;219:113433. Epub 2021 Apr 7.

Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Lanzhou University, West Donggang Road 199, Lanzhou, 730000, China. Electronic address:

Due to the threat of escalating multi-drug resistant gram-negative bacteria to human health and life, novel antimicrobial agents against gram-negative pathogens are urgently needed. As antimicrobial peptides are not prone to induce bacteria resistance, they are believed to be one kind of promising class of potential antimicrobial agent candidates to combat multi-drug resistant bacteria for long-term use. Jelleine-1, first isolated from the royal jelly of honeybees, is a typical amphiphilic antimicrobial peptide and shows broad antimicrobial spectrum and negligible toxicity. Read More

View Article and Full-Text PDF

Chromic and Fluorescence-Responsive Metal-Organic Frameworks Afforded by N-Amination Modification.

ACS Appl Mater Interfaces 2021 Apr 20. Epub 2021 Apr 20.

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China.

Sensory materials that show color and/or fluorescence changes in response to specific gases or vapors have important applications in many fields. Here, we report the postsynthetic preparation of novel sensory metal-organic frameworks (MOFs) and their multiple responsive properties. Through postsynthetic N-amination, the 2,2'-bipyridyl spacers in a Zr(IV) MOF are partially transformed into -aminobipyridinium. Read More

View Article and Full-Text PDF

A Genetic Screen Using the Drosophila melanogaster TRiP RNAi Collection To Identify Metabolic Enzymes Required for Eye Development.

G3 (Bethesda) 2019 Jul;9(7):2061-2070

Department of Biology, Indiana University, 1001 East Third Street, Bloomington, IN 47405.

The metabolic enzymes that compose glycolysis, the citric acid cycle, and other pathways within central carbon metabolism have emerged as key regulators of animal development. These enzymes not only generate the energy and biosynthetic precursors required to support cell proliferation and differentiation, but also moonlight as regulators of transcription, translation, and signal transduction. Many of the genes associated with animal metabolism, however, have never been analyzed in a developmental context, thus highlighting how little is known about the intersection of metabolism and development. Read More

View Article and Full-Text PDF

Desulfovibrio diazotrophica sp. nov., a sulphate reducing bacterium from the human gut capable of nitrogen fixation.

Environ Microbiol 2021 Apr 19. Epub 2021 Apr 19.

Gut Health and Microbes, Quadram Institute Bioscience, Norwich Research Park, Norwich, United Kingdom.

Sulphate-reducing bacteria (SRB) are widespread in human guts, yet their expansion has been linked to colonic diseases. We report the isolation, sequencing, and physiological characterisation of strain QI0027 , a novel SRB species belonging to the class Desulfovibrionia. Metagenomic sequencing of stool samples from 45 Chinese individuals, and comparison with 1690 Desulfovibrionaceae metagenome-assembled genomes recovered from humans of diverse geographic locations, revealed the presence of QI0027 in 22 further individuals. Read More

View Article and Full-Text PDF

Connexin 46 and connexin 50 gap junction channel properties are shaped by structural and dynamic features of their N-terminal domains.

J Physiol 2021 Apr 20. Epub 2021 Apr 20.

Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada.

Key Points: Gap junctions formed by different connexins are expressed throughout the body and harbor unique channel properties that have not been fully defined mechanistically. Recent structural studies by Cryo-EM have produced high-resolution models of the related but functionally distinct lens connexins (Cx50 and Cx46) captured in a stable open state, opening the door for structure-function comparison. Here, we conducted comparative MD simulation and electrophysiology studies to dissect the isoform-specific differences in Cx46 and Cx50 intercellular channel function. Read More

View Article and Full-Text PDF

A conserved folding nucleus sculpts the free energy landscape of bacterial and archaeal orthologs from a divergent TIM barrel family.

Proc Natl Acad Sci U S A 2021 Apr;118(17)

Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605;

The amino acid sequences of proteins have evolved over billions of years, preserving their structures and functions while responding to evolutionary forces. Are there conserved sequence and structural elements that preserve the protein folding mechanisms? The functionally diverse and ancient (βα) TIM barrel motif may answer this question. We mapped the complex six-state folding free energy surface of a ∼3. Read More

View Article and Full-Text PDF

Metagenomic insights into the bacteria responsible for producing biogenic amines in sufu.

Food Microbiol 2021 Sep 17;98:103762. Epub 2021 Feb 17.

School of Material Science and Food Engineering, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan, 528402, China.

Harmful levels of biogenic amines (BAs) are frequently identified in sufu. The microorganisms and mechanisms responsible for BA production in sufu, however, are not well documented. In this study, sufu samples were randomly obtained from various regions of China. Read More

View Article and Full-Text PDF
September 2021

Metatranscriptomics reveals the gene functions and metabolic properties of the major microbial community during Chinese Sichuan Paocai fermentation.

Food Microbiol 2021 Sep 3;98:103573. Epub 2020 Jul 3.

State Key Laboratory of Food Science & Technology, No. 235 Nanjing East Road, Nanchang, Jiangxi, 330047, PR China; School of Food Science & Technology, Nanchang University, No. 235 Nanjing East Road, Nanchang, Jiangxi, 330047, PR China. Electronic address:

Chinese Sichuan Paocai (CSP) is one of the world's best-known fermented vegetables with a large presence in the Chinese market. The dynamic microbial community is the main contributor to Paocai fermentation. However, little is known about the ecological distribution and functional importance of these community members. Read More

View Article and Full-Text PDF
September 2021

Calcium-based signalling systems in guard cells.

New Phytol 2001 Jul;151(1):109-120

Department of Biological Sciences, Institute of Environmental and Natural Sciences, Lancaster University, Bailrigg, Lancaster, LA1 4YQ, UK.

Calcium is a ubiquitous intracellular signal responsible for controlling numerous cellular processes in both plants and animals. As an example, Ca has been shown to be a second messenger in the signal transduction pathways by which stomatal guard cells respond to external stimuli. Regulated increases in the cytosolic concentration of free calcium ions ([Ca ] ) in guard cells have been observed to be a common intermediate in many of the pathways leading to either opening or closing of the stomatal pore. Read More

View Article and Full-Text PDF

NLK suppresses MAVS-mediated signaling in black carp antiviral innate immunity.

Dev Comp Immunol 2021 Apr 16:104105. Epub 2021 Apr 16.

State Key Laboratory of Developmental Biology of Freshwater Fish, College of Life Science, Hunan Normal University, Changsha, 410081, China. Electronic address:

Mammalian Nemo-like kinase (NLK) plays important roles in multiple biological processes including immune response; however, the roles of teleost NLK remain largely unknown. In the present study, the NLK homologue (bcNLK) of black carp (Mylopharyngodon piceus) has been cloned and characterized. The coding region of bcNLK consists of 1427 nucleotides and encodes 476 amino acid, including two low complexity region (LCR) domains at the N-terminus and a serine/threonine protein kinase catalytic (S-TKc) domain in the middle region. Read More

View Article and Full-Text PDF

Optimising glyphosate tolerance in rapeseed (Brassica napus L.) by CRISPR/Cas9-based geminiviral donor DNA replicon system with Csy4-based single-guide RNA processing.

J Exp Bot 2021 Apr 19. Epub 2021 Apr 19.

National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, China.

Rapeseed (Brassica napus L.) is an important oil crop worldwide, and effective weed control can protect its yields and quality. Farmers can benefit from tolerant cultivars when using herbicides, such as glyphosate. Read More

View Article and Full-Text PDF

Ciprofloxacin-Resistant Displays Enhanced Resistance and Virulence in Iron-Restricted Conditions.

J Proteome Res 2021 Apr 19. Epub 2021 Apr 19.

MOE Key Laboratory of Tumor Molecular Biology and Key Laboratory of Functional Protein Research of Guangdong Higher Education Institutes, Institute of Life and Health Engineering, Jinan University, Guangzhou 510632, China.

The unreasonable misuse of antibiotics has led to the emergence of large-scale drug-resistant bacteria, seriously threatening human health. Compared with drug-sensitive bacteria, resistant bacteria are difficult to clear by host immunity. To fully explore the adaptive mechanism of resistant bacteria to the iron-restricted environment, we performed data-independent acquisition-based quantitative proteomics on ciprofloxacin (CIP)-resistant (CIP-R) in the presence or absence of iron. Read More

View Article and Full-Text PDF

Fluorescent Ensemble Sensors and Arrays Based on Surfactant Aggregates Encapsulating Pyrene-Derived Fluorophores for Differentiation Applications.

ACS Appl Mater Interfaces 2021 Apr 19. Epub 2021 Apr 19.

Key Laboratory of Applied Surface and Colloids Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, PR China.

Surfactant assemblies have drawn great attention in fabricating fluorescent sensors as they can provide advantages such as easy preparation, low cost, aqueous detection, high fluorescence stability, high sensitivity to external stimuli, etc. We have devoted the past few years to fluorescent cross-reactive sensors and arrays that are advantageous in differentiating similar analytes and analyzing mixed samples. In this Spotlight on Applications, we introduce our recent advances in developing surfactant assembly-based fluorescent sensors and arrays for discrimination applications. Read More

View Article and Full-Text PDF

The transcriptome landscapes of citrus leaf in different developmental stages.

Plant Mol Biol 2021 Apr 19. Epub 2021 Apr 19.

Citrus Research & Education Center, Department of Microbiology and Cell Science, Institute of Food and Agricultural Sciences (IFAS), University of Florida, Lake Alfred, FL, 33850, USA.

Key Message: The temporal expression profiles of citrus leaves explain the sink-source transition of immature leaves to mature leaves and provide knowledge regarding the differential responses of mature and immature leaves to biotic stress such as citrus canker and Asian citrus psyllid (Diaphorina citri). Citrus is an important fruit crop worldwide. Different developmental stages of citrus leaves are associated with distinct features, such as differences in susceptibilities to pathogens and insects, as well as photosynthetic capacity. Read More

View Article and Full-Text PDF

Mobile SAR signal N-hydroxypipecolic acid induces NPR1-dependent transcriptional reprogramming and immune priming.

Plant Physiol 2021 Apr 19. Epub 2021 Apr 19.

Institute for Molecular Ecophysiology of Plants, Department of Biology, Heinrich Heine University, Universitätsstraße 1, D-40225 Düsseldorf, Germany.

N-Hydroxypipecolic acid (NHP) accumulates in the plant foliage in response to a localized microbial attack and induces systemic acquired resistance (SAR) in distant leaf tissue. Previous studies indicated that pathogen inoculation of Arabidopsis (Arabidopsis thaliana) systemically activates SAR-related transcriptional reprogramming and a primed immune status in strict dependence of FLAVIN-DEPENDENT MONOOXYGENASE 1 (FMO1), which mediates the endogenous biosynthesis of NHP. Here, we show that elevations of NHP by exogenous treatment are sufficient to induce a SAR-reminiscent transcriptional response that mobilizes key components of immune surveillance and signal transduction. Read More

View Article and Full-Text PDF

Combination Processing Method Reduced IgE-Binding Activity of by Modifying Lysine, Arginine, and Cysteine on Multiple Allergen Epitopes.

J Agric Food Chem 2021 Apr 19. Epub 2021 Apr 19.

College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Jimei University, Xiamen, Fujian 361021, China.

Allergic reactions occur after the whole food is ingested, rather than the purified allergen. The present study explores the low-allergenic food processing for by analysis of macrostructure, digestibility, and immunoreactivity. Furthermore, the presence of modified amino acids on the reported IgE epitopes was analyzed by mass spectrometry. Read More

View Article and Full-Text PDF