Dab tsi yog peb lub ntsiab lus ntawm kev pib ua haujlwm?
Dab tsi yog peb lub ntsiab lus ntawm kev pib ua haujlwm?

Video: Dab tsi yog peb lub ntsiab lus ntawm kev pib ua haujlwm?

Video: Dab tsi yog peb lub ntsiab lus ntawm kev pib ua haujlwm?
Video: Lus Qhuab Qhia | "Txoj Kev Yug Los Ua Neeg Yog Dab Tsi?" 2024, Kaum ib hlis
Anonim

pib complex txhais. Cov complex tsim rau pib ntawm kev txhais lus. Nws muaj 30S ribosomal subunit; mRNA; N-formyl-methionine tRNA; thiab peb pib yam.

Kuj nug, dab tsi yog qhov pib ua haujlwm?

Protein Synthesis thiab Degradation Lub 70S pib complex yog tsim raws li 50S subunit khi thiab GTP yog hydrolyzed. Qhov no pib complex yog ib qho ua tiav ribosome uas muaj fMet tRNA hauv P site, ua raws li AUG codon ntawm mRNA, thiab ribosomal A site npaj tau txais qhov thib ob aminoacyl-tRNA.

Ib yam li ntawd, peb qhov chaw ntawm ribosome yog dab tsi? Hauv cov kab mob, archaea, thiab eukaryotes, qhov tsis zoo ribosome muaj peb kev khi qhov chaw uas accommodate tRNAs: A qhov chaw , tus P qhov chaw , thiab E qhov chaw . Nkag mus aminoacy-tRNAs (tRNA nrog cov amino acid covalently txuas yog hu ua aminoacyl-tRNA) nkag mus rau ribosome ntawm A qhov chaw.

Ntawm no, 3 kauj ruam ntawm kev txhais lus yog dab tsi?

Kev txhais lus: Pib, nruab nrab, thiab xaus Kev txhais lus muaj ntau yam zoo tib yam peb ntu, tab sis lawv muaj cov npe zoo dua: pib , elongation , thiab kev txiav txim. Kev pib ("pib"): nyob rau theem no, lub ribosome tau ua ke nrog mRNA thiab thawj tRNA thiaj li pib txhais lus.

Dab tsi ua rau kev pib ua haujlwm thaum pib txhais lus?

Ib pib complex rau txhais lus Cov ntaub ntawv los ntawm kev sib dhos ntawm ribosomal subunits thiab pib tRNA (met-tRNA) ntawm pib codon ntawm mRNA. Cov pib complex ua tiav.

Pom zoo: