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hemin/carie dentaire
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Structural and electronic properties of the liver fluke hemoglobin heme cavity by nuclear magnetic resonance: hemin isotope labeling.
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Reconstitution of liver fluke (Dicrocoelium dendriticum) apo-hemoglobin with hemins selectively deuterated at specific positions has permitted the assignment of several heme resonances in the proton nuclear magnetic resonance spectrum of the Met-aquo and Met-cyano forms of the holoprotein. It was
Proton NMR study of the myoglobin reconstituted with meso-tetra(n-propyl)hemin.
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Spectrophotometric titration of meso-tetra(n-propyl)hemin with sperm-whale apomyoglobin revealed their 1:1 complex formation. The purified reconstituted metmyoglobin bound with an equal molar amount of CN- and the second CN- ligation was not evidenced, suggesting that the hemin is not loosely
Waterproofing the heme pocket. Role of proximal amino acid side chains in preventing hemin loss from myoglobin.
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The ability of myoglobin to bind oxygen reversibly depends critically on retention of the heme prosthetic group. Globin side chains at the Leu(89)(F4), His(97)(FG3), Ile(99)(FG5), and Leu(104)(G5) positions on the proximal side of the heme pocket strongly influence heme affinity. The roles of these
Structural and electronic properties of the liver fluke heme cavity by nuclear magnetic resonance and optical spectroscopy. Evidence for a distal tyrosine residue in a normally functioning hemoglobin.
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Structural features of the heme and the heme cavity of the monomeric hemoglobin (Hb) from the platyhelminth Dicrocoelium dendriticum were investigated by optical and proton nuclear magnetic resonance spectroscopy. Using nuclear Overhauser effects (NOEs) from resonances assigned previously through
The effect of statherin and its shortened analogues on anaerobic bacteria isolated from the oral cavity.
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The susceptibility (MIC) of 44 strains of anaerobic bacteria isolated from the oral cavity and 3 standard strains to statherin and its C-terminal fragments with sequences QYQQYTF, YQQYTF, QQYTF, QYTF and YTF was determined by means of plate dilution technique in Brucella agar with 5% content of
Effects of hemin, CO2, and pH on the branching of Candida albicans filamentous forms.
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Morphological transitions of wild-type and oxidative stress-tolerant Candida albicans strains were followed in the RPMI-FBS culture medium at pH values and CO2 levels characteristic for the anatomical niches inhabited by this opportunistic human pathogen fungus, including the oral cavity as well as
Chaperonin-Nanocaged Hemin as an Artificial Metalloenzyme for Oxidation Catalysis.
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Taking inspiration from biology's effectiveness in functionalizing protein-based nanocages for chemical processes, we describe here a rational design of an artificial metalloenzyme for oxidations with the bacterial chaperonin GroEL, a nanocage for protein folding in nature, by supramolecular
Preparation of Molecularly Imprinted Composites Initiated by Hemin/Graphene Hybrid Nanosheets and Its Application in Detection of Sulfamethoxazole.
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Molecularly imprinted polymers (MIPs) exhibit high selectivity resulting from imprinted cavities and superior performance from functional materials, which have attracted much attention in many fields. However, the combination of MIPs film and functional materials is a great challenge. In this study,
Hemin and Cobalt Protoporphyrin Inhibit NLRP3 Inflammasome Activation by Enhancing Autophagy: A Novel Mechanism of Inflammasome Regulation.
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Inflammasomes are intracellular protein platforms, which, upon activation, produce the highly proinflammatory cytokines interleukin (IL)-1β and IL-18. Heme, hemin and their degradation products possess significant immunomodulatory functions. Here, we studied whether hemin regulates inflammasome
Crystal structural analysis of human serum albumin complexed with hemin and fatty acid.
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BACKGROUND
Human serum albumin (HSA) is an abundant plasma protein that binds a wide variety of hydrophobic ligands including fatty acids, bilirubin, thyroxine and hemin. Although HSA-heme complexes do not bind oxygen reversibly, it may be possible to develop modified HSA proteins or heme groups
Proton nuclear magnetic resonance study of the molecular and electronic structure of the heme cavity in Aplysia cyanometmyoglobin.
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The 1H NMR spectrum of the low-spin, cyanide-ligated ferric complex of the myoglobin from the mollusc Aplysia limacina has been investigated. All of the resolved resonances from both the hemin and the proximal histidine have been assigned by a combination of isotope labeling, spin decoupling,
Identification of the titrating group in the heme cavity of myoglobin. Evidence for the heme-protein pi-pi interaction.
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The pH dependence of the proton NMR chemical shifts of met-cyano and deoxy forms of native and reconstituted myoglobins reflects a structural transition in the heme pocket modulated by a single proton with pK 5.1-5.6. Comparison of this pH dependence of sperm whale and elephant myoglobin and that of
NMR study of the molecular and electronic structure of the heme cavity of Aplysia metmyoglobin. Resonance assignments based on isotope labeling and proton nuclear Overhauser effect measurements.
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The 1H NMR characteristics of the high-spin metmyoglobin from the mollusc Aplysia limacina have been investigated and compared with those of the myoglobin (Mb) from sperm whale. Aplysia metMb exhibits a normal acid----alkaline transition with pK approximately 7.8. In the acidic form, the heme methyl
Effect of the N-terminus on heme cavity structure, ligand equilibrium, rate constants, and reduction potentials of nitrophorin 2 from Rhodnius prolixus.
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The D1A mutant of recombinant NP2 has been prepared and shown to have the expression-initiation methionine-0 cleaved during expression in E. coli, as is the case for recombinant NP4, where Ala is the first amino acid for the recombinant protein as well as for the mature native protein. The heme
Promoter architecture of the Porphyromonas gingivalis fimbrillin gene.
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Porphyromonas gingivalis fimbriae can mediate adherence to many of the available substrates in the oral cavity. Expression of P. gingivalis fimbriae is regulated at the transcriptional level by environmental signals, such as temperature and hemin concentration. The arrangement of the upstream
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