Cov txheej txheem twg tsim mRNA?
Cov txheej txheem twg tsim mRNA?

Video: Cov txheej txheem twg tsim mRNA?

Video: Cov txheej txheem twg tsim mRNA?
Video: cov txheej txheem ntawm lub rooj me thaum tsaus ntuj 2024, Kaum ib hlis
Anonim

Transcription yog txheej txheem uas DNA tau theej (transcribed) rau mRNA , uas nqa cov ntaub ntawv xav tau rau kev tsim cov protein. Kev hloov pauv yuav tshwm sim hauv ob kauj ruam dav. Tus tub txib ua ntej RNA yog ces "edited" rau tsim tawm qhov xav tau mRNA molecule ib txheej txheem hu ua RNA splicing.

Tib neeg kuj nug, mRNA ua li cas?

mRNA yog synthesized nyob rau hauv lub nucleus siv cov nucleotide ib theem zuj zus ntawm DNA ua ib tug template. Cov txheej txheem no yuav tsum muaj nucleotide triphosphates ua substrates thiab yog catalyzed los ntawm enzyme RNA polymerase II. Cov txheej txheem ntawm kev ua mRNA los ntawm DNA yog hu ua transcription, thiab nws tshwm sim nyob rau hauv lub nucleus.

Tsis tas li ntawd, yuav ua li cas tom qab mRNA tsim? Nws tau pib thiab nres cov cim ntawm qhov chaw tshwj xeeb ntawm DNA strand. Qhov twg mRNA mus tom qab sau ntawv? tawm hauv lub nucleus, mus rau cytoplasm, khi rau ribosome nyeem.

Ib tug kuj yuav nug, dab tsi yog mRNA ua?

Eukaryotic mRNA precursors yog ua tiav los ntawm 5 'capping, 3' cleavage thiab polyadenylation, thiab RNA splicing kom tshem tawm introns ua ntej raug thauj mus rau cytoplasm qhov twg lawv tau txhais los ntawm ribosomes. Nascent ua ntej mRNA Cov ntawv sau tseg yog txuam nrog cov chav kawm ntawm ntau RNA-binding proteins hu ua hnRNP proteins.

Qhov twg zoo tshaj piav qhia yuav ua li cas mRNA raug tsim?

mRNA yog tsim los ntawm RNA polymerase, siv DNA ua tus qauv. mRNA yog tsim los ntawm DNA, siv RNA polymerase ua tus qauv. C. mRNA yog tsim los ntawm duplicating RNA pom nyob rau hauv lub nucleus.

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