Sequence Microheterogeneity of Parvalbumin, The Major Fish Allergen
Document Type
Article
Publication Date
2013
Keywords
Structural Microheterogeneity, Protein Polymorphism, Protein Isoforms, Allergen, Ef-hand, Parvalbumins, Oncomodulin, Intrinsic Disorder
Digital Object Identifier (DOI)
https://doi.org/10.1016/j.bbapap.2013.04.025
Abstract
The microheterogeneity of amino acid sequence observed in various allergens may affect immune response, but incidence of sequence microheterogeneity in allergens and its relation to their allergenicity are unclear. The occurrence of sequence microheterogeneity in major fish allergen, parvalbumin (PA), has been explored using bioinformatics approaches. 44% of 111 species with known PA sequence have PA isoforms. 41% of these species exhibit from 1 to 4 cases of PA sequence microheterogeneity, i.e. unique pairs of PA isoforms with sequence identity above 90%. 29% of 210 PA sequences studied are characterized by microheterogeneity. The occurrence of allergens among them is 2.5-fold higher than among other PAs. The incidence of sequence microheterogeneity within more allergenic β isoform of PA is 2.0-fold lower than that for its less allergenic α isoform. 39 residues affected by PA microheterogeneity are concentrated in the region of helices A, B, F, while helices D and E are the most conservative region. 44% and 11% of the microheterogeneous substitutions are located in the species-specific and cross-reactive IgE-binding epitopes of PAs, respectively. 45% and 48% of the substitution cases are predicted to cause notable changes in protein disorder propensity and protein stability, respectively. Hence, the increased allergenicity rate among PAs having microheterogeneous isoforms can be related to differences in their IgE-binding caused directly or in an allosteric manner. Overall, sequence microheterogeneity is shown to be inherent to many of PAs and likely contributes to PA allergenicity.
Was this content written or created while at USF?
Yes
Citation / Publisher Attribution
Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics, v. 1834, issue 8, p. 1607-1614
Scholar Commons Citation
Lapteva, Yulia S.; Uversky, Vladimir N.; and Permyakov, Sergei E., "Sequence Microheterogeneity of Parvalbumin, The Major Fish Allergen" (2013). Molecular Medicine Faculty Publications. 531.
https://digitalcommons.usf.edu/mme_facpub/531
