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Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine.

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Atomic co-ordinates and structure factors for the T67R/S92D metMbCN mutant have been deposited with the Protein Data Bank, under accession codes 1h1x and r1h1xsf, respectively. Protein engineering and cofactor replacement have been employed as tools to introduce/modulate peroxidase activity in sperm

The mouse L-histidine decarboxylase gene: structure and transcriptional regulation by CpG methylation in the promoter region.

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To investigate the regulation of mouse L-histidine decarboxylase (HDC) gene expression, we isolated genomic DNA clones encoding HDC. Structural analysis revealed that the mouse HDC gene was composed of 12 exons, spanning approximately 24 kb. Northern blotting analysis indicated that, among the cell

Carbonic anhydrase activators: X-ray crystal structure of the adduct of human isozyme II with L-histidine as a platform for the design of stronger activators.

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Activation of the carbonic anhydrase (CA, EC 4.2.1.1) isoforms hCA I, II, and IV with l-histidine and some of its derivatives has been investigated by kinetic and X-ray crystallographic methods. l-His was a potent activator of isozymes I and IV (activation constants in the range of 4-33microM), and

Histidine decarboxylase expression in mouse mast cell line P815 is induced by mouse peritoneal cavity incubation.

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Phenotype of P815 mouse mast cells changes markedly during culture in the peritoneal cavity of syngenic BDF1 mice. The cells, cultured for 1 week in the peritoneal cavity of syngenic BDF1 mice, proliferate and express high levels of L-histidine decarboxylase (HDC) and mouse mast cell protease

Evaluation of the postmortem ageing process of beef M. semitendinosus based on ultrasound-assisted l-histidine treatment

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This paper aimed to investigate the postmortem ageing process of beef M. semitendinosus (ST, just slaughtered muscles) using ultrasound-assisted l-histidine treatment. The treatments with different concentrations of l-histidine solutions (0.1%, 0.15%, and 0.2%, w/v) at 4 °C for 60 min were labeled

Coordination features of difunctionalized beta-cyclodextrins with carnosine: ESI-MS and spectroscopic investigations on 6A,6D-di-(beta-alanyl-L-histidine)-6A,6D-dideoxy-beta-cyclodextrin and 6A,6C-di-(beta-alanyl-L-histidine)-6A,6C-dideoxy-beta-cyclodextrin and their copper(II) complexes.

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The synthesis and characterization of two beta-cyclodextrins (beta-CD) functionalized with two units of carnosine (beta-alanyl-L-histidine) through the amino group, 6A,6C-(beta-alanyl-L-histidine)-6A,6C-dideoxy-beta-cyclodextrin (ACCDAH) and

Expression of L-histidine decarboxylase in granules of elicited mouse polymorphonuclear leukocytes.

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Infiltrating polymorphonuclear leukocytes (PMN) in the peritoneal cavity were found to express L-histidine decarboxylase (HDC), the rate-limiting enzyme of histamine synthesis, in a csein-induced peritonitis model. Expression of HDC was detected in the elicited PMN, but not in the peripheral blood

The significance of apical K+ channels in mudpuppy feeding behavior.

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Behavioral experiments were conducted to determine the effects of known potassium channel blockers, minnow extract (a natural food substance), and other taste stimuli on feeding behavior in the mudpuppy (Necturus maculosus). Groups of 10-15 mudpuppies were presented with one or more of the following

Novel Imprinted Polymer for the Preconcentration of Cadmium with Determination by Inductively Coupled Plasma Mass Spectrometry.

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A novel Cd(II)-imprinted polymer was prepared with chemical immobilization approach by using N-methacryloyl-L-histidine as a vinylated chelating agent for on-line solid phase extraction of Cd(II) for determination by inductively coupled plasma mass spectrometry. Cd(II)-monomer complex was

Purification and properties of an extracellular collagenolytic protease produced by the human oral bacterium Bacillus cereus (strain Soc 67).

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The major collagenolytic proteinase present in the culture filtrate of Bacillus cereus (strain Soc 67, isolated from the human oral cavity) has been purified to homogeneity by a procedure that comprised concentration of ultrafiltered growth medium on a Millipore PTTK00005 membrane, precipitation

Bacteria coated by polyphenols acquire potent oxidant-scavenging capacities.

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Several microbial species, including probiotic lactic acid bacteria, have the ability to irreversibly bind a large variety of polyphenols (flavonoids) and anthocyanidins found in many colored fruits and vegetables and to enhance their total oxidant-scavenging capacities (TOSC). The binding of

Crystallization of Amino Acids on a 21-well Circular PMMA Platform using Metal-Assisted and Microwave-Accelerated Evaporative Crystallization.

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We describe the design and the use of a circular poly(methyl methacrylate) (PMMA) crystallization platform capable of processing 21 samples in Metal-Assisted and Microwave-Accelerated Evaporative Crystallization (MA-MAEC). The PMMA platforms were modified with silver nanoparticle films (SNFs) to

Redox reactivity of the heme Fe3+/Fe 2+ couple in native myoglobins and mutants with peroxidase-like activity.

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The reaction enthalpy and entropy for the one-electron reduction of the ferric heme in horse heart and sperm whale aquometmyoglobins (Mb) have been determined exploiting a spectroelectrochemical approach. Also investigated were the T67R, T67K, T67R/S92D and T67R/S92D Mb-H variants (the latter

Studies towards enantioselective surface imprinted polymers.

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Molecularly imprinted polymers (MIPs) are tailor-made materials that can specifically rebind desired target molecules. Usually, the template is in solution with monomers that form a specific polymeric cavity around the template. Here, a model system with an amino acid (Fmoc-L-Histidine) is

Synthesis and antioxidant activity of new homocarnosine beta-cyclodextrin conjugates.

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Several in vitro and in vivo studies have suggested that carnosine (beta-alanil-L-histidine) and homocarnosine (beta-aminobutyril-L-histidine) can act as scavengers of reactive oxygen species. beta-Cyclodextrin was functionalized with homocarnosine, obtaining the following new bioconjugate isomers:

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