RU96116815A - Способ амплификации нуклеиновой кислоты - Google Patents

Способ амплификации нуклеиновой кислоты

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RU96116815A
RU96116815A RU96116815/13A RU96116815A RU96116815A RU 96116815 A RU96116815 A RU 96116815A RU 96116815/13 A RU96116815/13 A RU 96116815/13A RU 96116815 A RU96116815 A RU 96116815A RU 96116815 A RU96116815 A RU 96116815A
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thermostable enzyme
chemically modified
reaction
mixture
thermostable
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RU96116815/13A
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RU2174556C2 (ru
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Эдвард Бирч Дэвид
Джозеф Лэрд Уолтер
Энтони Зокколи Майкл
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Ф.Хоффманн-Ля Рош Аг
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Claims (14)

1. Термостабильный фермент, который обратимо инактивируют путем химической модификации, отличающийся тем, что инкубация химически модифицированного термостабильного фермента в водном буфере при щелочном значении pH при температуре ниже приблизительно 25oС не приводит к существенному увеличению ферментативной активности в течение промежутка времени менее приблизительно 20 мин и где инкубация химически модифицированного фермента в водном буфере, значение рН которого доведено до приблизительно 8-9 при 25oС, при температуре выше приблизительно 50oС приводит по крайней мере к двукратному увеличению ферментативной активности в течение промежутка времени менее приблизительно 20 мин.
2. Химически модифицированный термостабильный фермент по п. 1, где ферментативная активность является активностью термостабильной ДНК-полимеразы или активностью термостабильной лигазы.
3. Химически модифицированный термостабильный фермент по п. 1, где ферментативная активность является активностью термостабильной ДНК-полимеразы и что термостабильная ДНК-полимераза происходит из видов бактерий, выбранных из группы родов, состоящей из Thermus aguaticus, Thermus thermophilus и Thermotoga maritima.
4. Химически модифицированный термостабильный фермент по любому из пп. 1-3, который получают путем реакции смеси термостабильного фермента с модифицирующим реагентом.
5. Химически модифицированный термостабильный фермент по любому из пп. 1-3, который получают путем реакции смеси термостабильного фермента с модифицирующим реагентом, где реакцию проводят при щелочном значении рН при температуре ниже приблизительно 25oС, где реагентом является ангидрид дикарбоновой кислоты общей формулы:
Figure 00000001

где R1 и R2 обозначают водород или органические радикалы, которые могут быть связаны, или общей формулы:
Figure 00000002

где R1 и R2 обозначают органические радикалы, которые предпочтительно связаны, и атомы водорода находятся в цис-положении, и где реакция приводит к практически полной инактивации ферментативной активности.
6. Химически модифицированный термостабильный фермент по любому из пп. 1-3, который получают путем реакции смеси термостабильного фермента с модифицирующим реагентом, где указанный модифицирующий реагент выбирают из группы, включающей малеиновый ангидрид, экзо-цис-3,6-эндоксо-Δ4-тетрагидрофталевый ангидрид, цитраконовый ангидрид, 3,4,5,6-тетрагидрофталевый ангидрид, цис-аконитовый ангидрид и 2,3-диметилмалеиновый ангидрид.
7. Химически модифицированный термостабильный фермент по любому из пп. 1-6, который получают путем реакции смеси термостабильного фермента с модифицирующим реагентом, где указанный модифицирующий реагент используют более чем в 20-кратном молярном избытке по отношению к термостабильному ферменту.
8. Химически модифицированный термостабильный фермент по любому из пп. 1-7, который получают путем реакции смеси термостабильного фермента с модифицирующим реагентом, где термостабильным ферментом является термостабильная ДНК-полимераза, происходящая из Thermus aguaticus, и где модифицирующим реагентом является цитраконовый ангидрид.
9. Химически модифицированный термостабильный фермент по любому из п.п. 1-7, который получают путем реакции смеси термостабильного фермента с модифицирующим реагентом, где термостабильным ферментом является термостабильная ДНК-полимераза, происходящая из Thermus thermophilus, и где модифицирующим реагентом является цис-аконитовый ангидрид.
10. Способ получения химически модифицированного термостабильного фермента, который обратимо инактивируют, включающий взаимодействие смеси термостабильного фермента с модифицирующим реагентом, где реакцию проводят при щелочном значении рН при температуре ниже приблизительно 25oС, где реагентом является ангидрид дикарбоновой кислоты общей формулы:
Figure 00000003

где R1 и R2 обозначают водород или органические радикалы, которые могут быть связаны, или общей формулы:
Figure 00000004

где R1 и R2 обозначают органические радикалы, которые предпочтительно связаны, и атомы водорода находятся в цис-положении, и где реакция приводит к практически полной инактивации ферментативной активности.
11. Способ амплификации, содержащейся в образце нуклеиновой кислоты-мишени, включающий следующие стадии: (а) введение образца в контакт с реакционной смесью для амплификации, содержащей праймер, комплементарный нуклеиновой кислоте-мишени, и химически модифицированный термостабильный фермент по любому из пп. 1-9, и (б) инкубацию образовавшейся на стадии (а) смеси при температуре выше приблизительно 50oС в течение промежутка времени, достаточного для реактивации химически модифицированного термостабильного фермента и позволяющего образовать продукты удлинения праймера.
12. Амплификация путем полимеразной реакции синтеза цепи смеси, содержащей пару праймеров и химически модифицированный термостабильный фермент по любому из пп. 1-9.
13. Набор для проведения полимеразной реакции синтеза цепи, содержащий химически модифицированный термостабильный фермент по любому из пп. 1-9.
14. Изобретение, как оно описано выше.
RU96116815/13A 1995-08-25 1996-08-23 Химически модифицированный термостабильный фермент, способ его получения, способ амплификации содержащейся в образце нуклеиновой кислоты, реакционная смесь для его осуществления и набор для проведения цепной реакции RU2174556C2 (ru)

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