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Purification and characterization of proteases secreted by transforming schistosomula of Schistosoma mansoni.

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Schistosomula of Schistosoma mansoni which are mechanically transformed at 4 degrees C and are then incubated at 37 degrees C in defined medium spontaneously secrete two proteases, a major one of 28 kDa and a minor one of 60 kDa. These were purified by ion exchange chromatography on DEAE-cellulose

Purification, identification, and biochemical characterization of a host-encoded cysteine protease that cleaves a leishmaniavirus gag-pol polyprotein.

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Leishmania RNA virus (LRV) is a double-stranded RNA virus that infects some strains of the protozoan parasite leishmania As with other totiviruses, LRV presumably expresses its polymerase by a ribosomal frameshift, resulting in a capsid-polymerase fusion protein. We have demonstrated previously that

Purification and characterization of a Ca(2+)-activated thiol protease from Drosophila melanogaster.

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A Ca(2+)-activated thiol protease was purified from Drosophila melanogaster. The procedure involves Phenyl-Sepharose, Reactive Red-Agarose and Q-Sepharose fast flow (or MonoQ) chromatographic steps. The enzyme eluting from Q-Sepharose fast flow seems to be homogeneous as judged by silver staining on

A new glycoprotein allergen/antigen with the protease activity from Aspergillus fumigatus.

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BACKGROUND Aspergillus fumigatus is an opportunistic fungus causing allergic and invasive aspergillosis in humans and animals. It secretes an array of complex biologically active glycoprotein antigens and allergens. It is important to identify and characterize probable potential virulent factors

Silver-Stained Fibrin Zymography: Separation of Proteases and Activity Detection Using a Single Substrate-Containing Gel.

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Silver-stained fibrin zymography for separation of protease bands and activity detection using a single substrate gel was designed. The method takes advantage of the nano-scale sensitivity of both zymography and silver staining. After sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis

Silver-stained fibrin zymography: separation of proteases and activity detection using a single substrate-containing gel.

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A new zymogram method, silver-stained fibrin zymography, for separation of protease bands and activity detection using a single substrate gel, was developed. The method takes advantage of the nanoscale sensitivity of both zymography and silver staining. After SDS-PAGE in a gel containing fibrin, the

Peptide mapping of polypeptides separated by two-dimensional electrophoresis: protease digestion directly on the two-dimensional gel followed by electrophoresis in reverse direction.

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A method is described which allows to reveal simultaneously the proteolytic patterns of numerous polypeptides separated by two-dimensional electrophoresis. After two-dimensional electrophoresis, the gels were dipped successively in buffers for preequilibration, protease digestion, and

Identification and monitoring of protease activity in recombinant Saccharomyces cerevisiae.

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An assay for the detection of yeast (Saccharomyces cerevisiae) protease activity, using partially purified yeast-derived recombinant hepatitis B surface antigen (rHBsAg) as substrate, was developed to monitor proteolysis of rHBsAg that may occur through fermentation and isolation. The method

Improved mass spectrometry compatibility is afforded by ammoniacal silver staining.

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Sequence coverage in MS analysis of protein digestion-derived peptides is a key issue for detailed characterization of proteins or identification at low quantities. In gel-based proteomics studies, the sequence coverage greatly depends on the protein detection method. It is shown here that

Monocytic elastase-mediated apolipoprotein-E degradation: Potential involvement of microglial elastase-like proteases in apolipoprotein-E proteolysis in brains with Alzheimers disease.

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Impaired clearance of soluble Aβ (amyloid-β) promotes Aβ aggregation in brains with Alzheimer's disease (AD), while apolipoprotein-E (ApoE) in microglia mediates Aβ clearance. We studied the protease responsible for ApoE(4) degradation in human peripheral monocyte extracts, which are from the same

The complement component C1s is the protease that accounts for cleavage of insulin-like growth factor-binding protein-5 in fibroblast medium.

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Cultured fibroblasts secrete an 88-kDa serine protease that cleaves insulin-like growth factor binding protein-5 (IGFBP-5). Because IGFBP-5 has been shown to regulate IGF-I actions, understanding the chemical identity and regulation of this protease is important for understanding how IGF-I

Purification and characterization of two extracellular alkaline proteases from a newly isolated obligate alkalophilic Bacillus sphaericus.

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Two novel extracellular serine proteases were purified to homogeneity from the cell-free culture filtrate of an obligate alkalophilic Bacillus sphaericus by a combination of ultrafiltration, ammonium sulfate precipitation and chromatographic methods. The enzymes showed similar substrate

A 32-kDa tyrosine-phosphorylated protein shows a protease-dependent increase in dead boar spermatozoa.

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Boar sperm TyrP32 is a 32-kDa tyrosine-phosphorylated protein that increases during the capacitation and acrosome reaction and during cryocapacitation. However, it is still unclear whether the increase in TyrP32 is an event that is limited to the process of sperm fertilization, including

Culex pipiens sperm motility is initiated by a trypsin-like protease from male accessory glands.

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In most animals, sperm are stored in a quiescent state in the male reproductive tract and only initiate motility when released into either the female reproductive tract, or, in the case of broadcast spawners, the external environment. Male accessory gland secretions transferred into the female

Murine, but not human, ephrin-B2 can be efficiently cleaved by the serine protease kallikrein-4: implications for xenograft models of human prostate cancer.

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BACKGROUND Ephrin-B2 is the sole physiologically-relevant ligand of the receptor tyrosine kinase EphB4, which is over-expressed in many epithelial cancers, including 66% of prostate cancers, and contributes to cancer cell survival, invasion and migration. Crucially, however, the cancer-promoting

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