Анализ in silico взаимодействия биологически активных компонентов морских водорослей с рядом белков-мишеней антидиабетических средств
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Аннотация
Морские водоросли оказывают положительный эффект при лечении сахарного диабета. Из водорослевого сырья был выделен ряд соединений, предположительно обладающих биологической активностью. Данное исследование направлено на уточнение возможного механизма связывания и ингибиторного действия соединений, полученных из морских водорослей, на ферменты протеин-тирозинфосфатазу 1В (РТР1В), который играет ключевую роль в формировании резистентности к инсулину, и α-глюкозидазу, участвующую в гидролизе углеводов после приема пищи. Ингибиторы данных ферментов могут быть использованы при лечении сахарного диабета второго типа. Экспериментами по молекулярному докингу показано, что антидиабетические соединения, как правило, связываются с молекулой белка PTP1B аллостерически, равноудалённо от спиралей α3, α6 и α7. Величина изменения свободной энергии ΔG комплекса при этом предпочтительнее, чем при связывании в активном центре. Пространственное положение для соединений экол, диэкол, 7-флороэкол и флорофукофуроэкол-А соответствовало положению референсного лиганда. При связывании с активным центром α-глюкозидазы данные соединения, напротив, проявляли заметное сродство к активному центру фермента. Флорофукофуроэкол-А, диэкол, а также экол продемонстрировали более высокий потенциал ингибирования ферментов по сравнению c акарбозой. Возможно, это обусловлено большим размером молекулы и увеличением количества гидроксильных групп, а также дополнительными гидрофобными и π-π взаимодействиями, которые отсутствуют в комплексе акарбозы с α-глюкозидазой. Данные по аффинности соединений, полученные в данной работе, хорошо коррелируют с экспериментальными данными для обоих белков. Спектр описанных взаимодействий играет ключевую роль в понимании механизмов, отвечающих за антидиабетическую активность морских водорослей.
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