Стабилизация структуры ?-CRO с заменой Val55>Cys и специфичность его взаимодействия с ДНК
Диссертация
Измерениями методом изотермической титрационной калориметрии. 3. С использованием метода генерированных ДНК-чипов выявлены. Связывание CroVC с аналогом «консенсусного А,-оператора» с делецией. Двухстадийного характера тепловой денатурации этого мутантного. Спектроскопии кругового дихроизма иН-ЯМР обнаружено проявление. Предпочтительные для связывания с CroVC последовательности двухи. Ассоциации… Читать ещё >
Содержание
- 1. Введение
- 2. Обзор литературы
- 2. 1. Роль Сго-репрессора в жизненном цикле бактериофага X
- 2. 2. Организация пространственной структуры Сго*
- 2. 3. Молекулярные основы взаимодействия Сго и ДНК
- 3. Материалы и методы
- 3. 1. Используемые материалы и реактивы
- 3. 2. Выделение и очистка препаративных количеств Сго и CroVC**
- 3. 3. Модификация SH-групп CroVC
- 3. 4. Физические методы исследования структурной и термодинамической организации Сго и CroVC
- 3. 5. Методы определения параметров связывания Сго и
- CroVC с синтетическими аналогами операторных ДНК
- 4. Результаты и обсуждение
- 4. 1. Оптимизация условий выделения Сго и CroVC. Сго — Сго-репрессор бактериофага X дикого типа. CroVC — мутантная форма Сго-репрессора бактериофага X с заменой Val55→Cys
- 4. 2. Сравнительные термодинамические и структурные исследования Сго и CroVC
- 4. 3. Изучение влияния замены Val55-«Cys на ДНК-связывающую активность Сго
- 5. Выводы
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