Sporothrix schenckii produces two extracellular proteinases in albumin- or collagen-supplemented unbuffered liquid medium. Proteinase I had an optimal pH of 6.0, and its activity was strongly inhibited by chymostatin. Proteinase II had an optimal pH of 3.5, and its activity was strongly inhibited by pepstatin. Speculating that these two proteinases are key enzymes for fungal growth, we investig...

Pseudomonas fluorescens P1 is a psychrotrophic bacterium isolated from milk. Proteinase P1, the main extracellular heat-stable proteinase fraction of P. fluorescens P1, has been purified to homogeneity. A procedure with a sandwich enzyme-linked immunosorbent assay, using microplates and alkaline phosphatase conjugate was shown to detect 0.25 ng of proteinase P1 in 1 ml of reconstituted skim mil...

Maturation of vaccinia virus (VV) core proteins is required for the production of infectious virions. The VV G1L and I7L gene products are the leading candidates for the viral core protein proteinase (vCPP). Using transient-expression assays, data were obtained to demonstrate that the I7L gene product and its encoded cysteine proteinase activity are responsible for vCPP activity.

The production and biochemical properties of cell envelope-associated proteinases from two strains of Streptococcus thermophilus (strains CNRZ 385 and CNRZ 703) were compared. No significant difference in proteinase activity was found for strain CNRZ 385 when cells were grown in skim milk medium and M17 broth. Strain CNRZ 703 exhibited a threefold-higher proteinase activity when cells were grow...

Proteinase, lipase and alpha-glucosidase activity in 81 clinically isolated Candida strains grown in nutrient-restricted media were comparatively measured, and the correlation between inducible enzyme activity and fungal growth was analyzed. Enzyme activity was assayed by colorimetric methods. Extracellular proteinase activity was significantly higher in Candida albicans, followed by C. parapsi...

An extracellular proteinase was purified from culture filtrates of Cryptococcus neoformans NHPY24 by DEAE ion-exchange chromatography and gelatin affinity column chromatography with azoalbumin as the substrate. The molecular mass of the purified enzyme was 43 kDa by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, its pH optimum was 7.0 to 8.0, and maximal activity was obtained at pH ...

RABBIT blastocysts exhibit a remarkable proteinase activity during the first (abembryonic) phase of implantation in the uterus. The activity becomes detectable around 6 days post-coitum (d p.c.) and rises rapidly until 7-7'/3 d p.c. when syncytial trophoblastic "knobs" penetrate the extracellular blastocyst coverings and establish contact to the uterine epithelium; thereafter blast~cyst protein...

Soil proteinase and proteinase-producing microbial community are closely associated with soil fertility health. Sea rice has been planted in the coastal beach of Jiaozhou Bay, China, an effort to transform saline-alkali into arable land. However, knowledge regarding bacterial degradation organic nitrogen sea soils is limited. This study aims investigate physicochemical characteristics enzymatic...

Hydrosoluble macromolecular fluorogenic substrates specific for the human immunodeficiency virus 1 (HIV-1) proteinase have been prepared. The fluoresceinyl peptide Ftc-epsilon-Ahx-Ser-Phe-Asn-Phe-Pro-Gln-Ile-Thr-(Gly)n, corresponding to the first cleavage site of HIV-1 gag-pol native precursor was linked to a water-soluble neutral (Lys)n derivative. The epsilon-aminohexanoyl residue (epsilon-Ah...