Идентификация белков плазмы крови человека с использованием внутренних пептидных стандартов в панорамном протеомном анализе
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Аннотация
Использование метода панорамной жидкостной хроматографии-масс-спектрометрии (ЖХ-МС/МС) позволяет идентифицировать в сложных протеомах до нескольких тысяч белков. Однако значительная часть протеома остается недоступной для идентификации из-за отсутствия или плохого качества МС/МС спектров. Описываемый в данной работе метод повышает вероятность идентификации белков плазмы крови человека путем выравнивания хроматографических данных образца смеси протеолитических пептидов и этого же образца, разбавленного синтетическими пептидами. Такая идентификация происходит в результате сопоставления тандемных масс-спектров синтетических пептидов с соответствующими выровненными хроматографическими пиками протеолитических пептидов. Используя данный подход, мы выявили 19 низко представленных белков плазмы крови человека, соответствующих 19 синтетическим пептидам, выбранным для исследования. Проверка идентификаций методом мониторинга диссоциативных переходов с изотопно-мечеными стандартами подтвердила наличие в плазме 17 белков.
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