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Timothy H Yosca et al.
Science (New York, N.Y.), 342(6160), 825-829 (2013-11-16)
Cytochrome P450 enzymes activate oxygen at heme iron centers to oxidize relatively inert substrate carbon-hydrogen bonds. Cysteine thiolate coordination to iron is posited to increase the pK(a) (where K(a) is the acid dissociation constant) of compound II, an iron(IV)hydroxide complex...
Tasha M Santiago-Rodriguez et al.
Microbiome, 3, 58-58 (2015-11-10)
Most human microbiota studies focus on bacteria inhabiting body surfaces, but these surfaces also are home to large populations of viruses. Many are bacteriophages, and their role in driving bacterial diversity is difficult to decipher without the use of in...
Ana C Ebrecht et al.
Biochimica et biophysica acta, 1850(1), 88-96 (2014-10-16)
Giardia lamblia is a pathogen of humans and other vertebrates. The synthesis of glycogen and of structural oligo and polysaccharides critically determine the parasite's capacity for survival and pathogenicity. These characteristics establish that UDP-glucose is a relevant metabolite, as it...
Naohisa Ogo et al.
Bioorganic & medicinal chemistry letters, 17(14), 3921-3924 (2007-05-26)
Inhibition of Eg5 represents a novel approach for the treatment of cancer. Here, we report the synthesis and structure-activity relationship of S-trityl-L-cysteine (STLC) derivatives as Eg5 inhibitors. Some of these derivatives such as 4f demonstrated enhanced inhibitory activity against Eg5...
John Gilchrist et al.
Proceedings of the National Academy of Sciences of the United States of America, 110(51), E5016-E5024 (2013-12-04)
Voltage-gated sodium (Nav) channels are embedded in a multicomponent membrane signaling complex that plays a crucial role in cellular excitability. Although the mechanism remains unclear, β-subunits modify Nav channel function and cause debilitating disorders when mutated. While investigating whether β-subunits...
Georg K A Hochberg et al.
Proceedings of the National Academy of Sciences of the United States of America, 111(16), E1562-E1570 (2014-04-09)
Mammalian small heat-shock proteins (sHSPs) are molecular chaperones that form polydisperse and dynamic complexes with target proteins, serving as a first line of defense in preventing their aggregation into either amorphous deposits or amyloid fibrils. Their apparently broad target specificity...
Francesco De Pascali et al.
Biochemistry, 53(22), 3679-3688 (2014-04-25)
Ischemia-reperfusion injury is accompanied by endothelial hypoxia and reoxygenation that trigger oxidative stress with enhanced superoxide generation and diminished nitric oxide (NO) production leading to endothelial dysfunction. Oxidative depletion of the endothelial NO synthase (eNOS) cofactor tetrahydrobiopterin can trigger eNOS...
Irene Weibrecht et al.
PloS one, 6(5), e20148-e20148 (2011-06-08)
We have developed an approach for simultaneous detection of individual endogenous protein modifications and mRNA molecules in single cells in situ. For this purpose we combined two methods previously developed in our lab: in situ proximity ligation assay for the...
Pegah Saremirad et al.
Journal of chromatography. A, 1359, 70-75 (2014-08-06)
Chromatographic-based protein refolding techniques have proven to be superior to conventional dilution refolding methods, due to the higher loading concentration and simultaneous purification. Among these techniques, Size Exclusion Chromatography (SEC) has in particular been demonstrated as an effective method for...
Joshua D Chandler et al.
The Journal of biological chemistry, 288(25), 18421-18428 (2013-05-01)
The endogenously produced oxidant hypothiocyanous acid (HOSCN) inhibits and kills pathogens but paradoxically is well tolerated by mammalian host tissue. Mammalian high molecular weight thioredoxin reductase (H-TrxR) is evolutionarily divergent from bacterial low molecular weight thioredoxin reductase (L-TrxR). Notably, mammalian...
Jie Wang et al.
European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences, 78, 31-36 (2015-06-27)
This study was the first to investigate the colonic stability of 17 peptide molecules (insulin, calcitonin, glucagon, secretin, somatostatin, desmopressin, oxytocin, Arg-vasopressin, octreotide, ciclosporin, leuprolide, nafarelin, buserelin, histrelin, [D-Ser(4)]-gonadorelin, deslorelin, and goserelin) in a model of the large intestine using...
Shaopeng Yuan et al.
Science translational medicine, 7(276), 276ra27-276ra27 (2015-02-27)
Airway mucus in cystic fibrosis (CF) is highly elastic, but the mechanism behind this pathology is unclear. We hypothesized that the biophysical properties of CF mucus are altered because of neutrophilic oxidative stress. Using confocal imaging, rheology, and biochemical measures...
Atta-ur-Rahman et al.
Journal of natural products, 68(2), 189-193 (2005-02-26)
Phytochemical investigation of the stem bark extract of Boswellia papyrifera afforded two new stilbene glycosides, trans-4',5-dihydroxy-3-methoxystilbene-5-O-{alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-rhamnopyranosyl-(1-->6)]-beta-D-glucopyranoside (1), trans-4',5-dihydroxy-3-methoxystilbene-5-O-[alpha-L-rhamnopyranosyl-(1-->6)]-beta-D-glucopyranoside (2), and a new triterpene, 3alpha-acetoxy-27-hydroxylup-20(29)-en-24-oic acid (3), along with five known compounds, 11-keto-beta-boswellic acid (4), beta-elemonic acid (7), 3alpha-acetoxy-11-keto-beta-boswellic acid (8)...
Ghazaleh Ashrafi et al.
The Journal of cell biology, 206(5), 655-670 (2014-08-27)
To minimize oxidative damage to the cell, malfunctioning mitochondria need to be removed by mitophagy. In neuronal axons, mitochondrial damage may occur in distal regions, far from the soma where most lysosomal degradation is thought to occur. In this paper...
Meng Huang et al.
ACS nano, 9(11), 10801-10816 (2015-10-07)
Alzheimer's disease (AD) exerts a heavy health burden for modern society and has a complicated pathological background. The accumulation of extracellular β-amyloid (Aβ) is crucial in AD pathogenesis, and Aβ-initiated secondary pathological processes could independently lead to neuronal degeneration and...
Lars Bräutigam et al.
Biochemical and biophysical research communications, 436(3), 491-496 (2013-06-13)
Glutaredoxins that contain a Cys-X-X-Cys active site motif are glutathione-dependent thiol-disulfide oxidoreductases. Vertebrate glutaredoxin 2 is characterized by two extra cysteines that form an intra-molecular disulfide bridge. Zebrafish glutaredoxin 2 contains four additional cysteines that are conserved within the infraclass...
Wimonsiri Tedsana et al.
Analytica chimica acta, 867, 1-8 (2015-03-31)
A new circular dichroism sensor for detecting Ni(2+) and Co(2+) was proposed for the first time using chiral chelating quantum dots. The detection principle was based on changing of circular dichroism signals of the chiral quantum dots when forming a...
Yang Hai et al.
Biochemistry, 52(51), 9294-9309 (2013-11-23)
The crystal structure of formiminoglutamase from Trypanosoma cruzi (TcFIGase) is reported at 1.85 Å resolution. Although the structure of this enzyme was previously determined by the Structural Genomics of Pathogenic Protozoa Consortium (PDB accession code 2A0M), this structure was determined...
Yang Li et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 24(22), 5079-5090 (2004-06-04)
The cysteine-modifying reagent N-ethylmaleimide (NEM) is known to augment currents from native M-channels in sympathetic neurons and cloned KCNQ2 channels. As a probe for channel function, we investigated the mechanism of NEM action and subunit specificity of cloned KCNQ2-5 channels...
Stephen Weber et al.
The Journal of biological chemistry, 289(49), 34175-34188 (2014-10-24)
The causative agent of Legionnaires' pneumonia, Legionella pneumophila, colonizes diverse environmental niches, including biofilms, plant material, and protozoa. In these habitats, myo-inositol hexakisphosphate (phytate) is prevalent and used as a phosphate storage compound or as a siderophore. L. pneumophila replicates...
Wenbo Wang et al.
Virology, 448, 229-237 (2013-12-10)
Envelope glycoprotein 2 (E2) of hepatitis C virus contains 18 conserved cysteine (Cys) residues in its ectodomain. By cysteine-alanine mutagenesis and function analysis, six Cys in H77 E2 (C494, C508, C552, C564, C607 and C644) were found to be indispensable...
John J Schellenberg et al.
BMC genomics, 15, 567-567 (2014-07-08)
Growing interest in cellulolytic clostridia with potential for consolidated biofuels production is mitigated by low conversion of raw substrates to desired end products. Strategies to improve conversion are likely to benefit from emerging techniques to define molecular systems biology of...
Marion Babot et al.
Biochimica et biophysica acta, 1837(6), 929-939 (2014-02-25)
An intriguing feature of mitochondrial complex I from several species is the so-called A/D transition, whereby the idle enzyme spontaneously converts from the active (A) form to the de-active (D) form. The A/D transition plays an important role in tissue...
Judith Bleuel et al.
Journal of biomechanical engineering, 137(6), 061009-061009 (2015-03-18)
Mechanical loading influences the structural and mechanical properties of articular cartilage. The cartilage matrix protein collagen II essentially determines the tensile properties of the tissue and is adapted in response to loading. The collagen II network is stabilized by the...
Marko Fonović et al.
Biochimica et biophysica acta, 1840(8), 2560-2570 (2014-04-01)
Cysteine cathepsins are normally found in the lysosomes where they are involved in intracellular protein turnover. Their ability to degrade the components of the extracellular matrix in vitro was first reported more than 25years ago. However, cathepsins were for a...
Xiaoying Koh-Stenta et al.
The Biochemical journal, 461(2), 323-334 (2014-05-03)
PRDM proteins have emerged as important regulators of disease and developmental processes. To gain insight into the mechanistic actions of the PRDM family, we have performed comprehensive characterization of a prototype member protein, the histone methyltransferase PRDM9, using biochemical, biophysical...
Satu Päiväläinen et al.
Journal of neurochemistry, 84(3), 533-545 (2003-02-01)
The myelin-associated glycoprotein (MAG) is a transmembrane cell adhesion molecule participating in myelin formation and maintenance. Calcium-activated/-dependent proteolysis of myelin-associated glycoprotein by calpain and cathepsin L-like activities has already been detected in purified myelin fractions, producing a soluble fragment, called...
Xiaochun Guo et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 963, 54-61 (2014-06-16)
The roles of glutathione (GSH) and cysteine (Cys) in the detoxification of Microcystin-LR (MC-LR) have recently become a popular area of research. However, lacking analysis methods for MC-LR-GSH and MC-LR-Cys (two main GSH pathway metabolites) in mammals, elucidation of the...
H Harada et al.
Die Pharmazie, 70(10), 678-683 (2015-11-26)
Although chemical trapping has been widely used to evaluate cytochrome P450-mediated drug bioactivation, thus far, only a few in vitro-trapping studies have been performed on UDP-glucuronosyltransferase (UGT)-mediated drug bioactivation. In this study, we used cysteine (Cys) as trapping agent to...
Edita Navratilova et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 35(18), 7264-7271 (2015-05-08)
Pain is aversive, and its relief elicits reward mediated by dopaminergic signaling in the nucleus accumbens (NAc), a part of the mesolimbic reward motivation pathway. How the reward pathway is engaged by pain-relieving treatments is not known. Endogenous opioid signaling...
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