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The proregion of papaya proteinase IV inhibits Colorado potato beetle digestive cysteine proteinases.

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Three distinct digestive protease systems were induced in larvae of the herbivorous pest, Colorado potato beetle (CPB; Leptinotarsa decemlineata Say), and used as a model to assess the ability of the proregion of papaya proteinase IV (PPIV; glycyl endopeptidase, EC 3.4.22.25) to act as an inhibitor

Sweet potato SPAP1 is a typical aspartic protease and participates in ethephon-mediated leaf senescence.

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Plant aspartic proteases are generally divided into three categories: typical, nucellin-like, and atypical aspartic proteases based on their gene and protein structures. In this report, a full-length cDNA SPAP1 was cloned from sweet potato leaves, which contained 1515 nucleotides (504 amino acids)

Process options in hepatitis B surface antigen extraction from transgenic potato.

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The process conditions for recombinant hepatitis B surface antigen (HBsAg) extraction from transgenic potato were examined. The effects of temperature, the reducing agent beta-mercaptoethanol (BME), and proteinase inhibitors on the level of antigenic activity of recovered HBsAg were determined.

Purification and characterization of an aspartic protease from potato leaves.

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A protease was isolated from potato (Solanum tuberosum L. cv. Pampeana) leaves 48 h after detaching, when aspartic protease (AP) activity is markedly increased. Purification was performed by ammonium sulfate precipitation, ion exchange chromatography and affinity chromatography. A size of 40 kDa was

Colorado potato beetles compensate for tomato cathepsin D inhibitor expressed in transgenic potato.

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We reported earlier the importance of digestive cathepsin D-like activity for initiating dietary protein hydrolysis in Colorado potato beetle, Leptinotarsa decemlineata Say [Brunelle et al. (1999) Arch. Insect Biochem. Physiol. 42:88-98]. We assessed here whether transgenic lines of potato (Solanum

Age-induced protein modifications and increased proteolysis in potato seed-tubers

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Long-term aging of potato (Solanum tuberosum) seed-tubers resulted in a loss of patatin (40 kD) and a cysteine-proteinase inhibitor, potato multicystatin (PMC), as well as an increase in the activities of 84-, 95-, and 125-kD proteinases. Highly active, additional proteinases (75, 90, and 100 kD)

Protein hydrolysis by colorado potato beetle, leptinotarsa decemlineata, digestive proteases: the catalytic role of cathepsin D

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Although several studies were carried out over the last 15 years to assess the nature and characteristics of digestive proteases in herbivorous insects, little is known about the relative importance of these enzymes in the hydrolysis of specific dietary proteins. In this study, we assessed the

An HrpB-dependent but type III-independent extracellular aspartic protease is a virulence factor of Ralstonia solanacearum.

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The host specificity of Ralstonia solanacearum, the causal organism of bacterial wilt on many solanaceous crops, is poorly understood. To identify a gene conferring host specificity of the bacterium, SL341 (virulent to hot pepper but avirulent to potato) and SL2029 (virulent to potato but avirulent

Changes in IGF-binding proteins in rats with experimental diabetes.

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The effects of streptozotocin-induced diabetes on proteolytic activity and collagen biosynthesis in skin lesions in rats and on IGF-I binding proteins in their serum were evaluated. It was found that both collagen in intact skin and collagen biosynthesis in skin lesions were lower compared to

Inhibition of cysteine and aspartyl proteinases in the alfalfa weevil midgut with biochemical and plant-derived proteinase inhibitors.

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Proteolytic activities in alfalfa weevil (Hypera postica) larval midguts have been characterized. Effects of pH, thiol activators, low-molecular weight inhibitors, and proteinase inhibitors (PIs) on general substrate hydrolysis by midgut extracts were determined. Hemoglobinolytic activity was

Inhibition of human napsin A.

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The newly-discovered human aspartic proteinase, napsin A was not susceptible to protein inhibitors from potato, squash or yeast but was weakly inhibited by the 17 kDa polypeptide from Ascaris lumbricoides and potently by isovaleryl and lactoyl-pepstatins. A series of synthetic inhibitors was also

Effects of cathepsin D inhibitor from Vicia sativa L. seed hulls on human skin fibroblasts and breast cancer cells (in vitro studies).

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Cathepsin D is a lysosomal protease which plays an important role in cancer invasion and metastasis. There are known inhibitors of that enzyme, such as pepstatin and potato inhibitor. In this study, we examined effects of the cathepsin D inhibitor from Vicia sativa L. seed hulls on cell cultures of

Detection and partial characterization of a human mast cell carboxypeptidase.

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Using a high performance liquid chromatography assay that detects the cleavage of the C-terminal leucine from angiotensin I, we have identified a carboxypeptidase activity in mast cells from human lung and in dispersed mast cell preparations from human skin. The enzyme activity was detected in a

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