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cereus jamacaru/tyrosine
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13 resultados
Specific chemical modification of the readily nitrated tyrosine of the RTEM beta-lactamase and of bacillus cereus beta-lactamase I. The role of the tyrosine in beta-lactamase catalysis.
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The function of the hydroxyl group of the tyrosine residue readily nitrated by tetranitromethane (tyrosine-105) in the RTEM plasmid-derived beta-lactamase (penicillinase; penicillin amido beta-lactam-hydrolase, EC 3.5.1.6) from E. coli and in Bacillus cereus beta-lactamase I has been investigated by
Alkaloid production by callous tissue cultures of Cereus peruvianus (Cactaceae).
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The morphologically undifferentiated cells of nonregenerant callous tissue of Cereus peruvianus cultured in the original medium and in medium supplemented with tyrosine were used as an alkaloid source. Comparison of alkaloid production by C. peruvianus plants and by callous tissues indicated that
Circular dichroism and magnetic circular dichroism studies of the biferrous site of the class Ib ribonucleotide reductase from Bacillus cereus: comparison to the class Ia enzymes.
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The rate limiting step in DNA biosynthesis is the reduction of ribonucleotides to form the corresponding deoxyribonucleotides. This reaction is catalyzed by ribonucleotide reductases (RNRs) and is an attractive target against rapidly proliferating pathogens. Class I RNRs are binuclear non-heme iron
Structure of the γ-D-glutamyl-L-diamino acid endopeptidase YkfC from Bacillus cereus in complex with L-Ala-γ-D-Glu: insights into substrate recognition by NlpC/P60 cysteine peptidases.
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Dipeptidyl-peptidase VI from Bacillus sphaericus and YkfC from Bacillus subtilis have both previously been characterized as highly specific γ-D-glutamyl-L-diamino acid endopeptidases. The crystal structure of a YkfC ortholog from Bacillus cereus (BcYkfC) at 1.8 Å resolution revealed that it contains
Rapid discrimination of Bacillus anthracis from other members of the B. cereus group by mass and sequence of "intact" small acid soluble proteins (SASPs) using mass spectrometry.
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The intentional contamination of buildings, e.g. anthrax in the bioterrorism attacks of 2001, demonstrated that the population can be affected rapidly and lethally if the appropriate treatment is not provided at the right time. Molecular approaches, primarily involving PCR, have proved useful in
Purification and partial characterization of a neutral protease from a virulent strain of Bacillus cereus.
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The factors involved in the pathogenesis of Bacillus cereus (B. cereus) in non-gastrointestinal diseases are poorly investigated. Some researchers suggest that B. cereus proteases may be involved in these illnesses. The aim of this work was to purify and characterize a protease isolated from a
Bacillus cereus strains fall into two clusters (one closely and one more distantly related) to Bacillus anthracis according to amino acid substitutions in small acid-soluble proteins as determined by tandem mass spectrometry.
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Small acid-soluble proteins (SASPs) are located in the core region of Bacillus spores and have been previously demonstrated as reliable biomarkers for differentiating Bacillus anthracis and Bacillus cereus. Using MS and MS-MS analysis of SASPs further phylogenetic correlations among B. anthracis and
Methionine regeneration and aminotransferases in Bacillus subtilis, Bacillus cereus, and Bacillus anthracis.
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The conversion of ketomethiobutyrate to methionine has been previously examined in a number of organisms, wherein the aminotransferases responsible for the reaction have been found to be members of the Ia subfamily (L. C. Berger, J. Wilson, P. Wood, and B. J. Berger, J. Bacteriol. 183:4421-4434,
Study of inhibition of outgrowth in Bacillus cereus T by ethyl picolinate.
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The effects of ethyl picolinate on germination, outgrowth, and sporulation of Bacillus cereus T were studied in a synthetic medium containing glucose. Ethyl picolinate specifically inhibited at two stages, outgrowth and sporulation. The initiation of germination and cell division was not affected.
Chemical composition of exosporium from spores of Bacillus cereus.
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Homogeneous fragments of exosporium were extricated in centigram amounts from dormant spores of Bacillus cereus and analyzed for intrinsic constituents. The membrane proved to be chemically complex but not unique, consisting mainly of protein (52%), amino and neutral polysaccharides (20%), lipids
Comparative genome analysis of Bacillus cereus group genomes with Bacillus subtilis.
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Genome features of the Bacillus cereus group genomes (representative strains of Bacillus cereus, Bacillus anthracis and Bacillus thuringiensis sub spp. israelensis) were analyzed and compared with the Bacillus subtilis genome. A core set of 1381 protein families among the four Bacillus genomes, with
Plipastatins: new inhibitors of phospholipase A2, produced by Bacillus cereus BMG302-fF67. III. Structural elucidation of plipastatins.
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Plipastatins are new inhibitors of phospholipase A2 produced by Bacillus cereus BMG302-fF67. Structures of the plipastatins have been determined by UV, mass and NMR spectrometries and chemical degradation. The carboxyl group of the C-terminal L-isoleucine of plipastatinic acid has been shown to form
Three important amino acids control the regioselectivity of flavonoid glucosidation in glycosyltransferase-1 from Bacillus cereus.
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Glycosyltransferase-1 from Bacillus cereus (BcGT1) catalyzes a reaction that transfers a glucosyl moiety to flavonoids, such as quercetin, kaempferol, and myricetin. The enzymatic glucosidation shows a broad substrate specificity when the reaction is catalyzed by wild-type BcGT1. Preliminary assays
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