Modification of the Streptomyces R61 DD-peptidase by N-bromosuccinimide resulted in a rapid loss of enzyme activity. In consequence, the role of the enzyme's two tryptophan residues was investigated by site-directed mutagenesis. Trp271 was replaced by Leu. The modification yielded a stable enzyme whose structural and catalytic properties were similar to those of the wild-type protein. Thus the ...

Conditions are described for the production of large amounts of an extracellular elastolytic protease by Vibrio vulnificus. The yield of enzyme was maximal during the late exponential growth phase and was stable during the stationary growth phase in a medium composed of 2% Proteose Peptone and 1.5% NaCl. The protease has a molecular weight of ca. 50,500 (estimated by sodium dodecyl sulfate-poly...

The toxin was isolated from the venom of sea snake, Lapemis hardwickii (Hardwick’s sea snake), through a fourstep purification by column chromatography. The toxin was proven homogenous by zonal electrophoresis, analytical ultracentrifugation, and isoelectric focusing. The toxin was also isolated in crystal form. The lethality of the purified toxin increased 23-fold when compared to the original...

(125)I-Labeled nerve growth factor binds to membrane preparations from superior cervical ganglia of rabbit in a specific fashion indicative of an interaction with the physiological receptor. Of various tissues examined, binding was observed only in the superior cervical ganglia, a presumed target organ of nerve growth factor. Binding of labeled factor is displaced by nonradioactive factor but n...

Two titrimetric and two spectrophotometric methods are described for the assay of famotidine (FMT) in tablets using N-bromosuccinimide (NBS). The first titrimetric method is direct in which FMT is titrated directly with NBS in HCl medium using methyl orange as indicator (method A). The remaining three methods are indirect in which the unreacted NBS is determined after the complete reaction betw...

This work includes the development of two spectrophotometric methods which are sensitive, accurate, stable, and has good recovery for determination phenylephrine-HCl as free form in pharmaceutical preparations. In method (A), phenylephrine is oxidized by potassium permanganate a basic solution sodium hydroxide bluish-green color resulting manganate (MnO 42- ) measured at wavelength 610 nm, line...

The L-arabinose-binding protein was purified by conventional methods from Escherichia coli cell paste and crystallized using Z-methyl-2,4-pentanediol. A molecular weight of 38,000 was determined using both ultracentrifugation and gel filtration. The amino acid composition revealed high concentrations of aspartic and glutamic residues and nonpolar amino acids. The presence of 2 cysteine residues...

The spiro[pyrrolidine-3, 3´-oxindole] moiety is present as a core in number of alkaloids with substantial biological activities. Here in we report design and synthesis of a library of compounds bearing spiro[pyrrolidine-3, 3´-oxindole] motifs that demonstrated exceptional inhibitory activity against the proliferation of MCF-7 breast cancer cells. The synthesis involved a one pot Pictet Spengler...

Bactenecins are highly cationic polypeptides of the large granules of bovine neutrophils, exerting in vitro a potent antimicrobial activity. Two bactenecins, with an approximate molecular weight of 7000 and 5000, called Bac7 and Bac5, are characterized by a high content of proline (greater than 45%) and arginine (greater than 23%) residues. Their complete amino acid sequences were determined by...

Microwave-assisted Suzuki-Miyaura cross-coupling reactions have been employed towards the synthesis of three different MAPKAPK2 (MK2) inhibitors to study accelerated aging in Werner syndrome (WS) cells, including the cross-coupling of a 2-chloroquinoline with a 3-pyridinylboronic acid, the coupling of an aryl bromide with an indolylboronic acid and the reaction of a 3-amino-4-bromopyrazole with...