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valine/carie dentaire
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Perturbing the water cavity surrounding the manganese cluster by mutating the residue D1-valine 185 has a strong effect on the water oxidation mechanism of photosystem II.
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The active site of water oxidation in Photosystem II (PSII) is a Mn4CaO5 cluster that is located in a cavity between the D1 and CP43 protein subunits by which it is coordinated. The remainder of this cavity is filled with water molecules, which serve as a source of substrate and participate in
V67L Mutation Fills an Internal Cavity To Stabilize RecA Mtu Intein.
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Inteins mediate protein splicing, which has found extensive applications in protein science and biotechnology. In the Mycobacterium tuberculosis RecA mini-mini intein (ΔΔIhh), a single valine to leucine substitution at position 67 (V67L) dramatically increases intein stability and activity. However,
[Changes in the primary structure of rabbit muscle aldolase under the influence of valine against a background of prolonged fasting].
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The primary structure of the muscle aldolase molecule was studied as affected by semilethal doses of valine administered the abdominal cavity of the rabbits after a long fasting. It is established that in spite of differences in the amino acid composition of the protein, uniformity of the peptides
Self-assembling of helical poly(phenylacetylene) carrying L-valine pendants in solution, on mica substrate, and on water surface.
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In the present work, we investigated self-assembling of a poly(phenylacetylene) carrying L-valine pendants (PPA-Val) in a water/methanol solution, upon evaporation of the solution on mica, and on the water surface. With intercalation of a fluorescence probe of Ru(phen)2(dppx)2+ (phen =
Valine 114 replacements in archaeal elongation factor 1 alpha enhanced its ability to interact with aminoacyl-tRNA and kirromycin.
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Valine 114 in the D(109)AAILVVA sequence of elongation factor 1alpha from the archaeon Sulfolobus solfataricus (SsEF-1alpha) was substituted with an acidic (V114E), basic (V114K), or cavity-forming (V114A) residue, and the effects on the biochemical properties of the factor were investigated. This
Shape and energetics of a cavity in c-Myb probed by natural and non-natural amino acid mutations.
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The shape and the energetics of a functional cavity in the R2 subdomain (90-141) of the c-Myb DNA-binding domain were investigated by spectroscopy and thermodynamic analysis. We focused on the valine 103 residue located in front of the cavity. Nine mutants, in which valine 103 was substituted with
Structural dynamics of myoglobin: ligand migration and binding in valine 68 mutants.
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We have combined Fourier transform infrared/temperature derivative (FTIR-TDS) spectroscopy at cryogenic temperatures and flash photolysis at ambient temperature to examine the effects of polar and bulky amino acid replacements of the highly conserved distal valine 68 in sperm whale myoglobin. In
Effects of cavities at the nicotinamide binding site of liver alcohol dehydrogenase on structure, dynamics and catalysis.
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A role for protein dynamics in enzymatic catalysis of hydrogen transfer has received substantial scientific support, but the connections between protein structure and catalysis remain to be established. Valine residues 203 and 207 are at the binding site for the nicotinamide ring of the coenzyme in
Role of the Conserved Valine 236 in Access of Ligands to the Active Site of Thermus thermophilus ba3 Cytochrome Oxidase.
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Knowledge of the role of conserved residues in the ligand channel of heme-copper oxidases is critical for understanding how the protein scaffold modulates the function of these enzymes. In this study, we investigated the role of the conserved valine 236 in the ligand channel of ba3 cytochrome c
The refined 2.2-A (0.22-nm) X-ray crystal structure of the ternary complex formed by bovine trypsinogen, valine-valine and the Arg15 analogue of bovine pancreatic trypsin inhibitor.
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Large orthorhombic crystals of the complex formed by bovine trypsinogen and a semisynthetic homologous bovine pancreatic trypsin inhibitor with the reactive-site lysine residue replaced by an arginine residue [( Arg15]PTI) have been obtained which are isomorphous with the crystals of PTI-trypsinogen
1H-nuclear magnetic resonance studies of human synovial fluid in arthritic disease states as an aid to confirming metabolic activity in the synovial cavity.
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1. A 1H-n.m.r. method was used to measure concentrations of valine, alanine, lactate, acetate, hyaluronan and lipids in synovial fluid obtained, during the normal course of examination from the knee joints of patients attending rheumatology and orthopaedic clinics. Fluid was available from 16
Effect of four-alpha-helix bundle cavity size on volatile anesthetic binding energetics.
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Currently, it is thought that inhalational anesthetics cause anesthesia by binding to ligand-gated ion channels. This is being investigated using four-alpha-helix bundles, small water-soluble analogues of the transmembrane domains of the "natural" receptor proteins. The study presented here
Activity of hydrolytic enzymes of Candida albicans strains isolated from patients with periodontal and membrane mucosae of oral cavity diseases.
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Fungi are elements of the ontocenosis of the oral cavity and causal factors of inflammatory lesions in its mucous membrane. The objective of the study was to find differences in the activity of hydrolytic enzymes of Candida albicans isolated from patients with diseases of the periodontium and mucous
Valine needs of male broilers from 42 to 56 days of age.
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An experiment was conducted using Ross x Ross 308 males to estimate the proportion of dietary valine needed to optimize performance in broilers from 42 to 56 d of age. All birds received common feeds from 0 to 42 d, and then experimental diets were given to 56 d of age. A diet consisting of corn,
Minimization of cavity size ensures protein stability and folding: structures of Phe46-replaced bovine pancreatic RNase A.
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The Phe46 residue, located in the hydrophobic core of RNase A, was replaced with other hydrophobic residues, leucine, valine, or alanine, and their X-ray crystallographic structures were determined up to 1.50-1.80 A resolution in an attempt to examine the relationship between structural changes and
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