A novel enzyme that catalyzes the efficient hydrolysis of Glu-Glu was isolated from soybean cotyledons by ammonium sulfate fractionation and successive column chromatographies of Q-sepharose, Phenyl sepharose, and Superdex 200. The apparent molecular mass of this enzyme was found to be 56 kDa and 510 kDa by SDS-polyacrylamide gel electrophoresis and Superdex 200 HR 10/30 column chromatography respectively. The enzyme had high activity against Glu-p-nitroanilide (pNA) and Asp-pNA, whereas Leu-pNA, Phe-pNA, Ala-pNA, and Pro-pNA were not hydrolyzed. The synthetic dipeptides Glu-Xxx and Asp-Xxx were hydrolyzed, but Xxx-Glu was not. The digestion of a Glu-rich oligopeptide, chromogranin A (Glu-Glu-Glu-Glu-Glu-Met-Ala-Val-Val-Pro-Gln-Gly-Leu-Phe-Arg-Gly-NH2) using this purified enzyme was also investigated. Glutamic acid residues were cleaved one by one from the N-terminus. These observations indicate that the enzyme removes glutamyl or aspartyl residues from N-terminal acidic amino acid-containing peptides. It is thought that it was an N-terminal acidic amino acid-specific aminopeptidase from a plant.
proteases could catalyze synthesis of a wide variety of peptides of various lengths and structures both in solution and on solid phase in organicsolvents. The following modified proteases were studied as catalysts for enzymaticpeptidesynthesis in polar organicsolvents (acetonitrile, dimethylformamide, and ethanol): pepsin sorbed on celite, a noncovalent complex of subtilisin with sodium dodecylsulfate
The invention relates to compounds of formula (I) or a pharmaceutically acceptable solvate or salt thereof, including a solvate of such a salt, wherein R
1
is a group such that a compound of formula (I) is a prodrug of 1R,2S-methoxamine that is converted within the kidney tubules into its active form or an active metabolite thereof. The compounds find particular use in the treatment or prophylaxis of urinary incontinence.
A process for the identification of bacteria and a kit of reagents for use in this process
申请人:NATIONAL RESEARCH DEVELOPMENT CORPORATION
公开号:EP0018825A1
公开(公告)日:1980-11-12
A procedure for identification of bacteria comprises subjecting the bacteria to a combination of tests for determination of 26 bacterial enzymes, permitting rapid identification by use of tests generally adapted for determination of constitutive enzymes. The procedure generally permits more rapid identification than previous bacterial identification procedures and is universally applicable to a very wide range of bacteria including most bacteria which are commonly encountered clinically. In a particular embodiment the invention includes a procedure for rapid differentation of the bacterial groups Escherichia, Klebsiella spp., Proteus and Pseudomonas spp., comprising subjecting the bacteria to a combination of tests for determination of bacterial acid phosphatase. beta-galactosidase, glutamate decarboxylase, phenylalanine deaminase, cytochrome oxidase, diacetyl producing enzymes and urease. Additionally the invention includes kits for carrying out the procedures of the invention. typically comprising separate specific substrates for each of the enzymes which it is desired to determine, the kit being preferably in the form of a test card or other suitable apparatus comprising a plurality of wells or compartments which separately contain the enzyme substrates.