Kev txhais lus ntawm mRNA raug txiav tawm li cas?
Kev txhais lus ntawm mRNA raug txiav tawm li cas?

Video: Kev txhais lus ntawm mRNA raug txiav tawm li cas?

Video: Kev txhais lus ntawm mRNA raug txiav tawm li cas?
Video: qhov txhab kev hlub 2024, Kaum ib hlis
Anonim

Kev txhais ntawm mRNA yog xaus when a stop codon (UAA, UAG, UGA) occupy A site of ribosome. Nres codons tsis tau lees paub los ntawm tRNAs thiab yog li ib qho kev tso tawm (RF) protein khi rau txoj hauv kev thiab hydrolyses cov ntawv cog lus ntawm tRNA kawg thiab cov amino acid.

Kuj paub, txhais li cas raug txiav?

Kev txhais lus xaus rau hauv tus txheej txheem hu ua kev txiav txim . Kev txiav txim tshwm sim thaum nres codon hauv mRNA (UAA, UAG, lossis UGA) nkag mus rau A site. Tom qab cov me me thiab loj ribosomal subunits cais los ntawm mRNA thiab los ntawm ib leeg, txhua lub caij tuaj yeem (thiab feem ntau ua sai sai) koom nrog lwm qhov. txhais lus.

Kuj Paub, lub luag haujlwm ntawm mRNA yog dab tsi thaum lub sijhawm txhais lus? Messenger RNA ( mRNA ) nqa cov ntaub ntawv genetic luam los ntawm DNA nyob rau hauv daim ntawv ntawm ib tug series ntawm peb-base code "cov lus," txhua yam uas qhia txog ib tug tshwj xeeb amino acid. Hloov RNA (tRNA) yog tus yuam sij rau kev txiav txim siab cov lus code hauv mRNA.

yuav ua li cas rau mRNA tom qab kev txhais lus?

Tom qab tus mRNA yog txhais (nws nyob ntawm seb nws yuav tsum muaj pes tsawg zaus txhais ), nws yuav degraded nyob rau hauv lub cell, vim nws ntseeg hais tias qhov degradation tshwm sim vim txhua yam sib txawv mRNA muaj lub neej ntev, tom qab lub sij hawm no nws yuav (tiav) thiab ces degraded.

Dab tsi tshwm sim thaum txhais lus?

Kev txhais lus tshwm sim nyob rau hauv ib tug qauv hu ua lub ribosome, uas yog lub Hoobkas rau synthesis ntawm cov proteins. Kev txhais lus mRNA molecule los ntawm ribosome tshwm sim nyob rau hauv peb theem: pib, elongation, thiab termination. Thaum pib, qhov me me ribosomal subunit khi rau qhov pib ntawm mRNA ib ntus.

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