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Trypsin-like protease of mites: purification and characterization of trypsin-like protease from mite faecal extract Dermatophagoides farinae. Relationship between trypsin-like protease and Der f III
- Source :
- Clinical Experimental Allergy. 23:777-784
- Publication Year :
- 1993
- Publisher :
- Wiley, 1993.
-
Abstract
- Summary A serine protease from mite faecal extract, Dermatophagoides farinae, was purified using DEAE-Sephacel anion exchange chromatography and Supcrdex 75 pg gel chromato-graphy. The molecular weight of this protease was 34 kD on SDS-PAGE under reducing conditions. The optimal pH and temperature of the protease were 8-0 and 47 C, respectively. In addition, this protease cleaved arginyl or lysyl residue containing substrates selectively and was only inhibited by aprotinin, PUT-175, tind soy bean trypsin inhibitor and not by chymostatin, E-64 and iodoacetic acid. These results show that our purified serine protease belongs to the trypsin-type. Purified trypsin-like protease was shown to be allergenic by enzyme-linked immunosorbent assay. Antigeni-city of trypsin-like protease was completely different from those of Der f I and Der f II. Both, 20 N-terminal amino acid sequence and amino acid compositions of the purified protease were very similar to those of Der f III. Good similarities were found between trypsin-like protease and Der f III concerning physicochemical properties such as molecular weight on SDS-PAGE and ammonium sulphate solubility. Summarizing the above data, it can be concluded that a trypsin-like protease from mite faecal extract is actually the Der f III allergen and that it may be involved in the digestive process of the mite as it was found not in mite body but in mite faeces.
- Subjects :
- Male
medicine.medical_treatment
Guanidines
Substrate Specificity
Feces
chemistry.chemical_compound
Immunology and Allergy
Aprotinin
Amino Acids
Peptide sequence
chemistry.chemical_classification
Mites
biology
Serine Endopeptidases
Temperature
Hydrogen-Ion Concentration
Middle Aged
Chromatography, Ion Exchange
Amino acid
Biochemistry
Chromatography, Gel
Female
Trypsin Inhibitors
medicine.drug
Adult
Serine Proteinase Inhibitors
Adolescent
Iodoacetic acid
Trypsin inhibitor
Molecular Sequence Data
Immunology
Enzyme-Linked Immunosorbent Assay
Arthropod Proteins
medicine
Animals
Humans
Amino Acid Sequence
Aged
Serine protease
Protease
Sequence Homology, Amino Acid
Allergens
Antigens, Plant
Benzamidines
Molecular Weight
Enzyme
chemistry
biology.protein
Digestive System
Sequence Alignment
Subjects
Details
- ISSN :
- 13652222 and 09547894
- Volume :
- 23
- Database :
- OpenAIRE
- Journal :
- Clinical Experimental Allergy
- Accession number :
- edsair.doi.dedup.....aa5bc795275f69a0a0c1a2e4d257da73