Hyperproduction of immunoglobulin G (IgG) is a major pathogenic factor in autoimmune diseases. Specific sorbents are used to eliminate the high level of IgG. Molecular docking can be used as a tool for theoretical search for sorbent ligands for the IgG removal from biological fluids. Using docking, modeling of amino acid interactions with IgG ligands was performed. Based on the docking results, active amino acids were identified and possible combinations of them were proposed for the creation of diand tripeptide sequences. As a result, aromatic amino acids (Tyr, Trp, Phe), di-and tripeptides based on them (Trp-DTyr, Phe-DTyr, Trp-Phe-DTyr, Phe-Trp-DTyr) were found to have high activity for IgG proteins, and three peptides (Trp-Phe-DTyr, Phe-Trp-DTyr) not only show high activity to total IgG, but can also be divided in their activity relative to subclasses of class G immunoglobulins.
Аннотация. Созданы биоспецифические сорбенты для удаления IgG и подклассов из биологических жидкостей на основе олигопептидов, содержащих остатки ароматических аминокислот. Проведена функциональная оценка сорбционных качеств экспериментальных образцов сорбентов и их селективности к подклассам IgG. Обнаружено, что все сорбенты имеют хорошие характеристики по удалению IgG из биологических жидкостей, но сорбент на основе Phe-Trp-DTyr эффективней остальных связывает общий IgG. По отношению к подклассам IgG лучшие результаты связывания следующие: Phe-Gln-Tyr-OMe-IgG1(86,53 %), Phe-Ala-Tyr-IgG2(60,2 %), Phe-Trp-DTyr-IgG3 (59,52 %) и IgG4 (55,05 %). Ключевые слова: сорбция, сорбенты, иммуноглобулины, подклассы, белки, лиганды, пептиды, селективность, сорбционная емкость Для цитирования. Селективность аффинных сорбентов на основе ароматических пептидов для связывания иммуноглобулинов класса G / Е. С. Пустюльга [и др.] // Вес. Нац. акад. навук Беларусi.
High-affinity receptor FcepsilonR1 is a key substance which participates in IgE-dependent allergic reactions of immediate type. A minimal sequence Arg136-Asn137-Trp138-Asp139, which takes part in binding with C3 and C4 fragments of IgE was determined by methods of computer analysis. As possible analogs of FcepsilonR1 receptor, capable of binding to Fc-fragment IgE, a number of peptide compounds containing this sequence were proposed. Biological researches have shown that these peptides possess immunobiological effect and bind to IgE. Studied the ability of peptides to bind with IgE class serum antibodies specific to allergen Dermatophagoides pteronyssinus in patients with allergic bronchial asthma.
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