Структура и функция универсального участка внутреннего связывания рибосомы из мРНК вируса RhPV (Rhopalosiphum padi virus)
Белковый синтез является сложным процессом, регулируемым на нескольких уровнях. Однако после попадания в цитоплазму влиять на эффективность трансляции становится возможным только на уровне стабильности мРНК и скорости образования инициаторных комплексов, и именно эти области регуляции трансляции вызывают повышенный интерес исследователей. Не последнюю роль играет и то, что многие вирусы… Читать ещё >
Содержание
- Список сокращений
- Обзор литературы
- Глава I. Молекулярные механизмы инициации трансляции у про- и эукариош
- 1. Прокариоты
- 1. 1. Общий механизм инициации трансляции у прокариот
- 1. 2. Связывание рибосомы с мРНК и выбор инициаторного кодона
- 1. 3. Энхансеры трансляции
- 1. 4. Структура и функции индивидуальных факторов инициации
- 1. 4. 1. IF
- 1. 4. 2. IF
- 1. 4. 3. IF
- 1. Прокариоты
- 2. Эукариоты и Археи.,
- 2. 1. Археи. ф 2.2 Структура эукариотических мРНК
- 2. 3. Сканирующая модель инициации трансляции
- 2. 4. Эукариотические факторы инициации
- 2. 4. 1. elFl
- 2. 4. 2. elFlA
- 2. 4. 3. eIF
- 2. 4. 4. eIF
- 2. 4. 5. eIF4A
- 2. 4. 6. eIF4B. w 2.4.7 eIF4F
- 2. 4. 8. eIF
- 2. 4. 9. eIF5B
- 1. IRES-элемент RhPV эффективно направляет трансляцию в лизате ретикулоцитов кролика
- 2. Факторы инициации 4-й группы eIF4A, 4 В, 4G не являются абсолютно необходимыми для образования
- 48. S комплекса на 5'-концевом IRES-элементе RhPV
- 3. Фактор инициации elFl необходим 40S рибосомной субчастице для достижения инициаторного кодона мРНК RhPV
- 4. Анализ целостности мРНК в ходе экспериментов
- 5. 5. '-IRES RhPV не содержит специфических сайтов связывания с компонентами инициаторного аппарата
- 6. Структурный анализ 5'-НТО RhPV
- 7. Рибосомная 40S субчастица и фактор инициации eIF образуют стабильный комплекс с IRES-элементом RhPV
Структура и функция универсального участка внутреннего связывания рибосомы из мРНК вируса RhPV (Rhopalosiphum padi virus) (реферат, курсовая, диплом, контрольная)
Белковый синтез является сложным процессом, регулируемым на нескольких уровнях. Однако после попадания в цитоплазму влиять на эффективность трансляции становится возможным только на уровне стабильности мРНК и скорости образования инициаторных комплексов, и именно эти области регуляции трансляции вызывают повышенный интерес исследователей. Не последнюю роль играет и то, что многие вирусы в процессе эволюции научились перепрограммировать трансляционный аппарат клетки на преимущественное использование вирусных мРНК. Очень часто это достигается именно на стадии инициации за счет наличия в ряде вирусных мРНК сложных структур, называемых участками внутреннего связывания рибосомы или IRES-элементами (от англ. Internal Ribosome Entry Site). Ввиду сложного устройства клеток высших эукариот, до сих пор не разработаны эффективные методы анализа инициации трансляции in vivo. Поэтому, по крайней мере, в ближайшие годы наилучшим методом изучения трансляции останется реконструкция комплексов рибосома*мРНК из очищенных компонентов в сочетании с техникой тоу-принта — ингибирования обратной транскрипции рибосомными комплексами. На сегодняшний день этим методом были определены механизмы инициации трансляции на ряде клеточных и вирусных мРНК.
Как уже упоминалось, мРНК многих вирусов содержит IRES-элементы. Это сложно организованные последовательности РНК, взаимодействующие с определенными компонентами инициаторного аппарата, направляющие рибосому к инициаторному кодону. Ввиду сложности IRES-элементов неудивительно, что большинство их функционирует лишь в определенных организмах, а небольшие вариации их первичной структуры могут в значительно мере понизить или даже свести на нет их активность. В связи с этим представляют интерес те редкие IRES-элементы, которые функционируют в разных организмах, а также обладают «модульной» структурой, поскольку механизм их работы в настоящее время не совсем понятен. Одним из подобных «универсальных» IRES-элементов является IRES, находящийся в 5'-неторанслируемой области (5-НТО) мРНК вируса насекомых RhPV (Rhopalosiphum padi virus). Настоящая работа посвящена исследованию взаимодействий IRES-элемента RhPV с компонентами инициаторного аппарата и механизма его работы.
В ходе данной работы было показано, что необычный IRES-элемент, расположенный в 5'-НТО вируса RhPV, способен образовывать инициаторный 48S комплекс в присутствии «канонических» факторов инициации. Однако, в отличие от известных IRES-элементов, которым факторы группы elF4 либо не нужны вовсе, либо критически необходимы, в данном случае они стимулируют образование 48S комплекса, но не абсолютно необходимы для его образования. Подобная «частичная» зависимость от факторов 4-й группы была подтверждена результатами трансляции в присутствии доминант-негативного мутанта elF4A (R362Q), ингибирующего хеликазную активность фактора elF4 °F. Помимо этого, было показано, что фактор инициации elF1, участвующий в сканировании, также необходим для инициации на мРНК RhPV.
Показано, что инициация происходит на полноразмерной 5-НТО RhPV, как в присутствии факторов группы elF4, так и в их отсутствие.
Путем последовательного удаления фрагментов 5'-НТО RhPV было продемонстрировано отсутствие каких-либо специфических участков связывания факторов инициации. Оказалось, что только 200 5'-концевых нуклеотидов неспособны функционировать как IRES, в то время как любой другой достаточно протяженный фрагмент 5'-НТО мог направлять внутреннюю посадку рибосомы. Эти результаты были интерпретированы в свете полученных в этой же работе данных по вовлеченности нуклеотидов 5'-НТО RhPV в образование вторичных структур. Было выяснено, что достаточно протяженные фрагменты 5-НТО RhPV, обладающие слаборазвитой вторичной структурой, способны неспецифически привлекать компоненты инициаторного аппарата, в частности, образовывать стабильный тройной комплекс MPHK*elF3*40S.
Полученные данные объясняют, почему IRES-элемент RhPV способен функционировать в различных эукариотических клетках. Эта способность может быть использована при создании универсальных векторов для экспрессии генов в клетках самого разного происхождения.
Обзор литературы.
выводы.
1. Исследован механизм образования 48S инициаторного комплекса на 5'-концевом IRES-элементе мРНК RhPV (Rhopalosiphum padi virus). Показано, что для инициации на данном IRESe необходимы факторы инициации elF1, elF2, elF3. Факторы e! F1A и elF4G с 4А существенно стимулировали образование 48S, в то время как elF4B не оказывал никакого влияния.
2. Охарактеризована вторичная структура 5'-НТО мРНК RhPV.
3. Показано, что активность IRES-элемента RhPV определяется AUG-проксимальной U-богатой последовательностью мРНК, находящейся преимущественно в одноцепоцечной конформации.
4. Установлено, что данная последовательность способна образовывать стабильный комплекс с 40S субчастицей и фактором инициации elF3.
5. Показана принципиальная возможность связывания 40S рибосомной субчастицы с неструктурированными внутренними участками мРНК с последующим образованием инициаторного комплекса.
МАТЕРИАЛЫ И МЕТОДЫ.
1. Реактивы и материалы.
В работе были использованы следующие реактивы и материалы: немеченые дезоксирибонуклеозид-5'-трифосфаты, рибонукпеозид-5'-трифосфаты фирмы Pharmacia (Швеция), a-[32P]-dATP и у-[32Р]-АТР из Обнинска, [353]-метионин фирм Amersham Biosciences и ICN Radiochemicals (последний любезно предоставлен Т.В.Пестовой). 1,4-дитио-0,1-треитол (DTT) — |3-меркаптоэтанол фирмы Serva (Германия) — акриламид, N. N'-метиленбисакриламид, персульфат аммония и N, N, N', N'-тетраметилэтилендиамин фирм Serva (Германия), Reanal (Венгрия) и Хеликон (Россия) — агароза фирмы Sigma (США), СМСТ фирмы Pierce (Франция), DMS фирмы Aldrich, PMSF (Хеликон). В качестве красителей для электрофореза использовали бромфеноловый синий фирмы Merck (Германия), кселенцианол фирмы Chemicals (Англия). Использовали неорганические реагенты фирм Sigma (США) и Merck (Германия). В работе использовали бактоагар, бактотриптон, дрожжевой экстракт фирмы DIFCO (США) — ампициллин и канамицин завода «Синтез» (Пенза). Использованные в данной работе олигонуклеотиды были синтезированы на фирмах Synthol и ЛИТЕХ (обе — Россия).
Биопрепараты: обратная транскриптаза из AMV фирмы Promega (США), ингибитор рибонуклеаз фирмы Fermentas (Литва), рибонуклеазы Т1, Т2 и V1, эндонуклеазы рестрикции фирм Fermentas и Сибэнзим (Россия), полинуклеотидкиназа, ДНК-лигаза и ДНК-полимераза фага Т4, РНК-полимераза фага Т7 фирмы Fermentas, набор для секвенирования ДНК фирмы USB (США), маркеры молекулярного веса ДНК и белков фирм Fermentas и GibcoBRL (США), свободная от РНКаз ДНКаза RQ1 фирмы Promega (США).
При клонировании использовали штаммы Е. coir. JM109 — для выделения плазмид, BL21, BL21(DE3) и BL21(DE3)RIL — для получения рекомбинантных белков.
2. Плазмидные конструкции.
Плазмида pLuc была создана путем вставки содержащего последовательность люциферазы Firefly фрагмента BamHI-Xhol из плазмиды pGEM-Luc (Promega) в аналогично порезанную плазмиду pSP72 (Promega). Для создания плазмиды pRhPV-Luc, фрагмент BamHlBamHI из плазмиды pGEM-CAT/RhPVA1/LUC [491] был лигирован в порезанную по ВатН1-сайту плазмиду pLuc. Во избежание каких-либо эффектов чужеродной нуклеотидной последовательности, остаток полилинкера pSP72 был удален путем вырезания из pRhPV-Luc фрагмента ДНК между сайтов Bsal и BamHI.
Заключение
.
Из представленных данных можно заключить, что функционально активной частью изучаемого IRES-элемента является слабоструктурированная 3'-концевая область. Можно утверждать также, что IRES-элемент RhPV из 5'-НТО его мРНК не содержит высокоспецифичных сайтов связывания компонентов инициаторного аппарата. Именно этим объясняется способность данного IRESa функционировать в различных системах в противоположность IRES-элементам афто-, пестии флавивирусов, которые обладают сродством к факторам инициации и/или рибосомным субчастицам только из клеток млекопитающих, и, потому, способны направлять трансляцию только в соответствующих системах.
По всей видимости, данный IRES вместо рекрутирования трансляционного аппарата посредством одного высокоспецифичного сайта работает посредством множества тандемных низкоафинных сайтов, которые, будучи расположенными в непосредственной близости друг от друга, способствуют достаточному для эффективной трансляции повышению локальной концентрации факторов инициации (напр., elF4G и elF3) и/или рибосом вблизи инициаторного AUG-кодона. Этим объясняется уникальная возможность удалять значительные участки IRES-элемента без потери активности, что является существенным отличием от «классических» IRES-элементов, в случае которых замены или делеции даже одного нуклеотида приводят к полной потере активности. Можно предположить, что минимальный размер индивидуального сайта посадки должен быть достаточным чтобы вместить хотя бы одну 40S субчастицу и elF3, т. е. иметь размер порядка 50- 100 нуклеотидов.
Можно предположить, что 40S рибосомная субчастица (при содействии elF3) способна связывать одноцепочечный U-богатый 54RES RhPV даже в отсутствие факторов группы elF4. Образовавшийся комплекс способен связывать тройной комплекс elF2*TPHK*GTP и осуществлять зависимое от elF1 сканирование в поисках AUG-кодона. Подобный механизм очень напоминает последовательность событий в прокариотах, где первичное связывание с мРНК осуществляет в U-богатых областях рибосомный белок S1, а функции elF1 выполняет IF3.
Образование 485-комплексов в отсутствие факторов 4-й группы и АТР было описано для искусственной мРНК, содержавшей 100% неструктурированную 5-НТО, состоявшую из 19 повторов САА [235]. Однако, данный лидер не функционировал как область внутренней посадки рибосомы. По всей видимости, это объясняется тем, что авторы использовали слишком короткую последовательность (около 40 нуклеотидов). Хотя нельзя исключать возможность влияния нуклеотидного состава одноцепочечных областей на эффективность их работы в качестве IRES-элементов, о возможности направлять трансляцию в различных бесклеточных системах, а также in vivo, сообщалось для IRESob, представленных длинными богатыми пуриновыми нуклеотидами последовательностями [493].
Наши данные не позволяют нам утверждать, что любая одноцепочечная последовательность мРНК может работать как IRES в любых in vitro или in vivo системах. Тем не менее, они показывают, что для эукариотической рибосомы не существует никаких препятствий для связывания с внутренними участками мРНК, в отсутствие специфических участков связывания. Это противоречит строгим правилам сканирующей модели в ее классическом виде, но, в тоже время, существенно дополняет ее. Таким образом, наши данные являются еще одним доказательством сходства аппаратов инициации эукариот и прокариот.
Необходимо отметить, что низкое содержание остатков гуанина и цитидина в 5'-НТО, как это имеет место в случае мРНК RhPV, не является характерным для остальных представителей рода криповирусов (CrPV, Drosophila С virus, Shrimp paralysis virus, Plautia stali intestinal virus и ряда других), которые, по всей видимости, содержат «классические» IRESbi, т.к. их 5'-НТО имеют большое содержание гуанина и цитидина, а также содержат множественные AUG-кодоны, некоторые из которых находятся в оптимальном нуклеотидном окружении. Примечательно, что 54RES CrPV, в отличие от RhPV, не функционирует в экстракте проростков пшеницы [482].
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