Related Experiment Videos
cDNA encoding the major mite allergen Der f II
M Trudinger1, K Y Chua, W R Thomas
1Western Australia Research Institute for Child Health, Princess Margaret Hospital, Perth.
Abstract:
cDNA encoding the major house dust mite allergen Der f II from Dermatophagoides farinae was amplified using the polymerase chain reaction and cloned into E. coli. It encoded a 129-residue protein with a calculated molecular weight of 14,021 D and had the expected high homology (88%) with Der p II including the absence of N-glycosylation sites and conserved cysteine residues. These results are consistent with the high degree of antibody crossreactivity and may help identify the differences in T-cell epitopes revealed for these molecules so far.
Insights
Researchers cloned the cDNA for the major house dust mite allergen Der f II. This finding aids in understanding cross-reactivity and T-cell epitope differences between house dust mite allergens.
Area of Science:
- Molecular Biology
- Immunology
- Allergen Research
Background:
- House dust mites are a major source of indoor allergens.
- Der f II is a significant allergen from Dermatophagoides farinae.
- Understanding allergen structure is crucial for immunotherapy and diagnosis.
Purpose of the Study:
- To clone and characterize the cDNA encoding the major house dust mite allergen Der f II.
- To investigate the structural homology between Der f II and other mite allergens.
- To provide insights into antibody cross-reactivity and T-cell epitope differences.
Main Methods:
- Polymerase chain reaction (PCR) amplification of Der f II cDNA.
- Cloning of the amplified cDNA into E. coli expression system.
- Bioinformatic analysis of the encoded protein sequence.
Main Results:
- Successfully amplified and cloned cDNA encoding Der f II.
- The encoded protein consists of 129 residues with a molecular weight of 14,021 D.
- High homology (88%) with Der p II was observed, including conserved cysteine residues and absence of N-glycosylation sites.
Conclusions:
- The structural characteristics of Der f II support observed antibody cross-reactivity.
- This study provides a foundation for identifying differences in T-cell epitopes.
- Further research can utilize this cloned allergen for diagnostic and therapeutic advancements.