Catalytic mechanism of SGAP, a double-zinc aminopeptidase from Streptomyces griseus.

The catalytic mechanism underlying the aminopeptidase from Streptomyces griseus (SGAP) was investigated. pH-dependent activity profiles revealed the enthalpy of ionization for the hydrolysis of leucine-para-nitroanilide by SGAP. The value obtained (30 +/- 5 kJ.

Preliminary crystallographic characterization of BSAP, an extracellular aminopeptidase from Bacillus subtilis.

The extracellular aminopeptidase from Bacillus subtilis (BSAP) has recently been cloned, overexpressed and purified from Escherichia coli. It is a monomer with a molecular weight of 46 425 Da, consisting of 425 amino-acid residues and a double-zinc catalytic centre. The recombinant enzyme was found to be stable for 20 min at 353 K, to function optimally in the pH range 8-9 and to prefer basic and large hydrophobic N-terminal amino acids in peptide and protein substrates.

Binding of inhibitory aromatic amino acids to Streptomyces griseus aminopeptidase.

The bacterial aminopeptidase isolated from the extracellular extract of Streptomyces griseus (SGAP) is a double-zinc exopeptidase with a high preference for large hydrophobic amino-terminus residues. It is a monomer of a relatively low molecular weight (30 kDa), is heat-stable, displays a high and efficient catalytic turnover and its activity is modulated by calcium ions. Several free amino acids were found to inhibit the activity of SGAP in the millimolar concentration range and can therefore serve for the study of binding of both inhibitors and reaction products.

Crystallization and preliminary X-ray analysis of the thermostable alkaline-tolerant xylanase from Bacillus stearothermophilus T-6.

The extracellular thermostable xylanase (XT-6) produced by the thermophilic bacterium Bacillus stearothermophilus T-6 was shown to bleach pulp optimally at pH 9 and 338 K, and was successfully used in a large-scale biobleaching mill trial. The xylanase gene was cloned and sequenced. The mature enzyme consists of 379 amino acids with a calculated molecular weight of 43,808 and pI of 9.

Structure determination of the extracellular xylanase from Geobacillus stearothermophilus by selenomethionyl MAD phasing.

Xylanases are hemicellulases that hydrolyze the internal beta-1,4-glycoside bonds of xylan. The extracellular thermostable endo-1,4-beta-xylanase (EC 3.2.

Substrate discrimination by formamidopyrimidine-DNA glycosylase: a mutational analysis.

Formamidopyrimidine-DNA glycosylase (Fpg) is a primary participant in the repair of 8-oxoguanine, an abundant oxidative DNA lesion. Although the structure of Fpg has been established, amino acid residues that define damage recognition have not been identified. We have combined molecular dynamics and bioinformatics approaches to address this issue.

Structure of formamidopyrimidine-DNA glycosylase covalently complexed to DNA.

Formamidopyrimidine-DNA glycosylase (Fpg) is a DNA repair enzyme that excises oxidized purines from damaged DNA. The Schiff base intermediate formed during this reaction between Escherichia coli Fpg and DNA was trapped by reduction with sodium borohydride, and the structure of the resulting covalently cross-linked complex was determined at a 2.1-A resolution.

Structural analysis of an Escherichia coli endonuclease VIII covalent reaction intermediate.

Endonuclease VIII (Nei) of Escherichia coli is a DNA repair enzyme that excises oxidized pyrimidines from DNA. Nei shares with formamidopyrimidine-DNA glycosylase (Fpg) sequence homology and a similar mechanism of action: the latter involves removal of the damaged base followed by two sequential beta-elimination steps. However, Nei differs significantly from Fpg in substrate specificity.

Interactions of Streptomyces griseus aminopeptidase with amino acid reaction products and their implications toward a catalytic mechanism.

Streptomyces griseus aminopeptidase (SGAP) is a double-zinc exopeptidase with a high preference toward large hydrophobic amino-terminus residues. It is a monomer of a relatively low molecular weight (30 kDa), it is heat stable, it displays a high and efficient catalytic turnover, and its activity is modulated by calcium ions. The small size, high activity, and heat stability make SGAP a very attractive enzyme for various biotechnological applications, among which is the processing of recombinant DNA proteins and fusion protein products.

Role for lysine 142 in the excision of adenine from A:G mispairs by MutY DNA glycosylase of Escherichia coli.

MutY participates in the repair of oxidatively damaged DNA by excising adenine from dA:dG and dA:8-oxodG mispairs; this DNA glycosylase can be cross-linked to DNA through Lys-142. We have investigated the properties of a mutant protein in which Lys-142 is replaced by glutamine. Using the rifampicin resistance assay, MutY K142Q was shown to complement the mutY mutator phenotype to the same extent as wild-type MutY.

Interactions of Streptomyces griseus aminopeptidase with a methionine product analogue: a structural study at 1.53 A resolution.

SGAP is an aminopeptidase present in the extracellular fluid of Streptomyces griseus cultures. It is a double-zinc enzyme with a strong preference for large hydrophobic amino-terminus residues. It is a monomeric (30 kDa) heat-stable enzyme, with a high and efficient catalytic activity modulated by calcium ions.

Crystallization and preliminary crystallographic analysis of glyceraldehyde 3-phosphate dehydrogenase from Sacchromyces cerevisiae (baker's yeast).

Two related and not thoroughly resolved issues in biochemistry concern the role, if any, of enzyme surfaces in routine metabolism and the method by which metabolic intermediates move between enzyme active sites during multi-step degradation or synthesis. An important enzyme for which a detailed three-dimensional structural analysis has been initiated is yeast glyceraldehyde 3-phosphate dehydrogenase (yGAP-DH). This enzyme is active as a tetramer of total molecular weight of 145 kDa and requires nicotinamide adenine dinucleotide (NAD+) as cofactor.

Inhibition of Streptomyces griseus aminopeptidase and effects of calcium ions on catalysis and binding--comparisons with the homologous enzyme Aeromonas proteolytica aminopeptidase.

Streptomyces griseus aminopeptidase is a zinc metalloenzyme containing 2 mol zinc/mol protein, similar to the homologous enzyme Aeromonas proteolytica aminopeptidase. In addition, a unique Ca2+-binding site has been identified in the Streptomyces enzyme, which is absent in the Aeromonas enzyme. Binding of Ca2+ enhances stability of the Streptomyces enzyme and modulates its activity and affinity towards substrates and inhibitors in a structure-dependent manner.

Dysrhythmia associated with fluoxetine treatment in an elderly patient with cardiac disease.

Although fluoxetine has been shown to be both efficacious and well tolerated, few data are available on the use of this drug in patients with preexisting heart disease and in the elderly. The authors report a case of an elderly patient in whom atrial fibrillation and bradycardia developed shortly after she began treatment with fluoxetine. The dysrhythmias recurred on rechallenge with the drug.

Metal allergy in cashiers. An in vitro and in vivo study for the presence of metal allergy.

Thirty healthy cashiers continuously exposed to nickel in coins were tested in vivo and in vitro for the presence of metal contact allergy. A traditional epicutaneous test and lymphocyte transformation test were used. We tested for nickel, cobalt and chromium sensitivity.