Gluten are proline- and glutamine-rich proteins present in wheat, barley, and rye and contain the immunogenic sequences that drive celiac disease (CD). Rothia mucilaginosa, an oral microbial colonizer, can cleave these gluten epitopes. The aim was to isolate and identify the enzymes and evaluate their potential as novel enzyme therapeutics for CD. The membrane-associated R. mucilaginosa protein...

The Colletotrichum plant-like subtilisins (CPLSs) are a family of proteins found only in species of the phytopathogenic fungus Colletotrichum. CPLSs have high similarity to plant subtilisins and our previous work has shown that they were acquired by an ancient horizontal gene transfer event from plants. The rapid growth of sequence data in public databases enabled us to reexamine the structure ...

background: one of the most important producers of high quality industrial enzymes is the gram-positive bacterium, bacillus subtilis (b. subtilis). one major limitation that hinders the wide application of b. subtilis is the secretion of high levels of extracellular proteases which degrade the secreted foreign proteins. in this study, homologus recombination technique was used to knock out its ...

A keratinolytic enzyme secreted by Aspergillus flavus K-03 cultured in feather meal basal medium (FMBM) containing 2% (w/v) chicken feather was purified and characterized. Keratinolytic enzyme secretion was the maximal at day 16 of the incubation period at pH 8 and 28℃. No relationship was detected between enzyme yield and increase of fungal biomass. The fraction obtained at 80% ammonium sulfat...

Subtilisin DY is very resistant to the denaturing action of urea: the conformational properties are not affected up to 4.5 M-urea, and even in the presence of 8 M-urea there is only a slow loss of ordered structure and caseinolytic activity. C.d. and fluorescence-emission studies also show that this proteinase is stable in the 5.5-10.0 pH range, whereas below pH 5.5 a sharp denaturation occurs ...

Extracellular Bacillus proteases are used as additives in detergent powders. We identified a Bacillus strain that produces a protease with an extremely alkaline pH optimum; this protease is suitable for use in modern alkaline detergent powders. The alkalophilic strain Bacillus alcalophilus PB92 gene encoding this high-alkaline serine protease was cloned and characterized. Sequence analysis reve...

subtilisins and proteinase K.]) Many protein cngincering studjes on subtilisins6) show that amino acid substitution can change the substrate specificity, pH depencience. thermostability, and eatalytie activity. Subtilisin BPN' mutant N218S (Asn218 is rcplaced by serine) has more thermostability than the wild-type cnzyme;7) Asn218 is threc rcsidues fi'om one of the catalytic residues. Ser221. Th...

A distinct class of the biologically important subtilisin family of serine proteases functions exclusively within the cell and forms a major component of the bacilli degradome. However, the mode and mechanism of posttranslational regulation of intracellular protease activity are unknown. Here we describe the role played by a short N-terminal extension prosequence novel amongst the subtilisins t...