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OJBTM
Online
Journal of Bioinformatics ©
Volume 15 (2): 178-190, 2014.
In silico identification
of B- and T-cell epitopes from a new wheat associated (Triticum aestivum) allergen, Tri a 37
Mohammad Tuhin Ali1*;
Parag Palit1; Shihab Hasan2,3
1Department of Biochemistry & Molecular Biology,
University of Dhaka, Dhaka, Bangladesh, 2Bioinformatics Lab, QIMR
Berghofer Medical Research Institute, Brisbane, Queensland, Australia, 3School
of Medicine, The University of Queensland (UQ), Brisbane, Queensland, Australia
ABSTRACT
Tuhin Ali M, Palit
P, Hasan S., In silico identification of B- and T-cell epitopes from a new
wheat associated (Triticum aestivum) allergen, Tri a 37, Onl J Bioinform., 15 (2): 178-190, 2014. Despite wheat and wheat products being major
components in human diet, avoidance is currently the only remedy for wheat
associated food allergy. Epitope identification hence can be a tool of high
importance in developing new epitope based peptide therapy against wheat
allergens. The present study focuses on applying in silico
tools for identifying the B and T-cell epitopes of alpha-Purothionin,
a new wheat allergen that is associated with severe allergy. Different
immuno-informatics tools from IEDB analysis resource were used to check the
potential B and T-cell epitopes. For B-cell epitope prediction we used
different propensity scales and machine learning methods, with the results
being mapped on their 3D structure predicted by homology modeling. The frequency
of interaction between the protein sequences and MHC II alleles within an IC50
range (IC50 <25) was the basis for T cell epitope prediction. A
total of five B-cell and eight T-cell epitopes were finally chosen. Among the
T-cell epitopes, The CLLILGLVL epitope was the most successful
which was found to be present at the N-terminal region of the core sequence.
The most potent B-cell epitope, LESNSDEPDTI was seen to be present at the
C-terminal region, indicating the importance of this region to induce IgE mediated response against wheat allergen.
Keywords: Allergens;
alpha purothionin; epitope; HLA ligand; Anaphylaxis.
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