Роль генетического обмена в формировании энтеротоксигенных вариантов вакцинных штаммов Escherichia coli
Диссертация
Путём введения контролируемой делеции в ген eltA в положении 23−120 субъединицы получен генно-инженерный токсоид, сохранивший иммуногенные детерминанты термолабильного токсина, но утративший его токсические свойства. В опытах in vivo изучена возможность восстановления токсического фенотипа сконструированного штамма и доказана биологическая безопасность полученной конструкции и штамма в целом… Читать ещё >
Содержание
- 1. Введение
- 2. Обзор литературы
- 2. 1. Бактериальные токсины
- 2. 1. 1. Классификация
- 2. 1. 2. Строение
- 2. 1. 3. Распространение среди микроорганизмов
- 2. 2. Генетика токсинообразования у Escherichia col
- 2. 2. 1. Строение генов
- 2. 2. 2. Роль горизонтального обмена генетическим материалом в формировании токсического фенотипа
- 2. 3. Борьба с токсикоинфекциями и роль вакцинопрофи-лактики
- 2. 3. 1. Современные вакцины
- 2. 3. 2. Особенности противотоксических вакцин
- 3. 3. 3. Биологическая безопасность вакцин
- 2. 1. Бактериальные токсины
- 3. 1. 1. Культивирование штаммов Е. col
- 3. 1. 1. 1. Использовавшиеся штаммы Е. col
- 3. 1. 1. 2. Использовавшиеся плазмиды
- 3. 1. 1. 3. Среды для культивирования микроорганизмов
- 3. 1. 2. Трансформация штаммов Е. coli плазмидной ДНК
- 3. 1. 3. Выделение и очистка плазмидной ДНК
- 3. 1. 4. Электрофорез в агарозном геле и визуализация плазмидной ДНК
- 3. 2. Клонирование генов
- 3. 2. 1. Расщепление плазмидной ДНК рестриктирующими эндонуклеазами
- 3. 2. 2. Выделения нужных1 фрагментов плазмидной ДНК из агарозных гелей
- 3. 2. 3. Обработка фрагментов ДНК нуклеазой S
- 3. 2. 4. Лигирование вектора со вставкой
- 3. 4. Получение делении в гене
- 3. 5. Отбор штаммов, содержащих конъюгативные плазми
- 3. 6. Введения вектора в бактерии-реципиенты с помощью мобилизации
- 3. 6. 1. Постановка триродителского скрещивания на плотной среде
- 3. 7. Реакция двойной иммунодиффузии в агаровом геле по методу Ухтерлони
- 3. 8. Оценка токсичности штаммов Е. col
- 3. 9. Оценка протективной активности потенциально вакцинного штамма
- 4. 1. Клонирование оперона полноразмерного LT в плазмиду pBR
- 4. 2. Клонирование детерминант А-субъединицы LT и В-субъединицы LT в плазмиду pBR
- 4. 3. Введение делеции в А-субъединицу полноразмерного
- 4. 4. Конструирование штамма Е. coli, содержащего детерминанту токсоида LT и систему рестрикции-модификации
- 4. 4. 1. Оценка эффективности мобилизации потенциального вектора в триродительском скрещивании
- 4. 4. 2. Введение детерминанты токсоида в плазмиду pSClOl
- 4. 4. 3. Получение штамма Е. coli, продуцирующего токсоид
- 4. 4. 4. Введение детерминанты, обеспечивающей биологическую безопасность потенциально вакцинного штамма
- 4. 4. 5. Контроль апатогенности полученной конструкции
- 4. 5. Конструирование штамма Е. coli, содержащего детерминанту А-субъединицы LT
- 4. 5. 1. Клонирование генов eltA и eltB в отдельные векторные плазмиды
- 4. 5. 2. Клонирование eltA в плазмиду pCRl
- 4. 6. Оценка возможности восстановления токсической активности термолабильного токсоида при скрещивании штаммов
- 4. 7. Оценка протективной активности рекомбинантного препарата
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