A commercial protease, Esperase, was covalently linked to Eudragit S-100, a reversible soluble–insoluble polymer by carbodiimide coupling. When compared to the native enzyme, the immobilized form presented a lower specific activity towards high molecular weight substrates but a higher thermal stability at all temperatures tested. The optimum pH of the immobilized protease was shifted towards th...

To aid in understanding the role of cellular immunity in limiting Pseudomonas aeruginosa infections, we have identified some of the principal antigens of the organism that are recognized by human T cells. Clones of T cells were selected in such a manner that they would provide information not only about the identity of Pseudomonas antigens, but also the T cell repertoires of immune donors. Most...

thermophilic bacillus sp. gus1, isolated from  a soil  sample obtained from citrus garden, produced at least three proteases as detected by sodium dodecyl sulfate polyacrylamide gel electrophoresis (sds-page) and zymogram analysis. the enzymes were stable in the alkaline ph range (8.0-12.0), with the optimum temperature and ph range of the proteases being 70ºc and 6.0-12.0, respectively. all th...

The regulatory gene (degT) from Bacillus stearothermophilus NCA1503 which enhanced production of extracellular alkaline protease (Apr) was cloned in Bacillus subtilis with pTB53 as a vector. When B. subtilis MT-2 (Npr- [deficiency of neutral protease] Apr+) was transformed with the recombinant plasmid, pDT145, the plasmid carrier produced about three times more alkaline protease than did the wi...

Pseudomonas aeruginosa elastase and the LasA protease are synthesized as preproenzymes with long amino-terminal propeptides. The elastase propeptide is cleaved autocatalytically in the periplasm to form a transient, inactive elastase-propeptide complex. In contrast, the processing of proLasA does not involve autoproteolysis. In this study, we analyzed short-term P. aeruginosa cultures under con...

In this study we observed the proliferation of Pseudomonas fluorescens (P. fluorescens) in mouse organ homogenates at 4 degrees C. P. fluorescens secreted a protease possessing properties different from those of the mammalian tissue proteases. The specificity of this protease required a basic amino acid residue at the P1 position at a pH optimum of 6.0. The specificity of the protease was simil...

Candida albicans is an important commensal of mucosal surfaces that is also an opportunistic pathogen. This organism colonizes a wide range of host sites that differ in pH; thus, it must respond appropriately to this environmental stress to survive. The ability to respond to neutral-to-alkaline pHs is governed in part by the RIM101 signal transduction pathway. Here we describe the analysis of C...

Germination of Microsporum gypseum macroconidia was accompanied by the release of alkaline protease, calcium ions, and inorganic phosphate into the germination fluid. The rate of germination was greatest during the first 2 hr, decreasing thereafter. This decrease in rate was accompanied by a decrease in protease activity, which was caused by an interaction of the enzyme with the inorganic phosp...

The present study describes the production, purification and characterization of alkaline protease from mutant strain of Bacillus subtilis EMS-8. The enzyme was purified using ammonium sulphate precipitation which gave 2.64 fold purification with 81.5% yield at 70% saturation. The molecular weight of the enzyme was determined using SDS-PAGE and it was found to be 25 KDa. The optimum pH of enzym...