2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Txhua chav tsev ribosomal muaj RNA nucleotide molecules thiab lawv cov proteins cuam tshuam. Thaum ob lub subunits no koom ua ke, nws tsim cov ribosomes nquag ntawm synthesis ntawm cov protein. Qhov kev koom ua ke ntawm ob lub subunits no tsuas yog ua los ntawm magnesium ions tam sim no hauv cell.
Yuav ua li cas ribosomal subunits tuav ua ke?
Ob lub subunits (30S thiab 50S) ntawm cov kab mob 70S ribosome yog tuav ua ke los ntawm 12 dynamic txuas nrog RNA–RNA, RNA–protein, thiab protein-protein kev sib cuam tshuam. Cov txheej txheem ntawm kev tsim choj, xws li seb tag nrho cov txuas hniav no tau tsim ib txhij los yog nyob rau hauv ib qho kev txiav txim, tsis to taub.
Yuav ua li cas ion yuav tsum tau rau kev koom tes ntawm ribosomal subunits?
Tshwj xeeb, magnesium ions ua lub luag haujlwm tseem ceeb hauv lub koom haum subunits, tRNA khi rau qhov chaw txiav txim siab, thiab feem ntau cov qauv thiab kev ruaj ntseg ntawm ribosome (16– 20). Raws li pom nyob rau hauv kab mob 70S ribosome, divalent hlau ions cuam tshuam los tuav lub ribosomal subunits ua ke (21).
Yuav ua li cas ion yuav tsum ua kom ob lub ribosomal subunits ua ke thaum lub sij hawm cov protein synthesis?
$Mg^{2+}$ yog qhov tseem ceeb rau ob txoj haujlwm tseem ceeb xws li kev ruaj khov ntawm cov qauv thib ob ntawm rRNA thiab khi ntawm cov protein ribosomal rau rRNA. Yog li, ion yuav tsum khaws ob chav ribosomal ua ke thaum lub sij hawm muaj protein ntausynthesis yog $Mg^+$. Cov lus teb raug yog kev xaiv B.
Ib yam twg yog lub luag haujlwm rau khi ob lub subunits ntawm ribosomes?
Mg2++ yog qhov nthuav dav di- thiab monovalent cations hauv cov hlwb hauv tag nrho peb lub npe, ua lub luag haujlwm tseem ceeb hauv cov qauv thiab kev ua haujlwm ntawm cov roj ntsha macromolecules. Ribosomes khi ib feem tseem ceeb ntawm tag nrho Mg2+ thiab K+ cations.
Pom zoo:
Ib yam twg tuav cov ribosomal subunits ua ke?
Txhua chav tsev ribosomal muaj RNA nucleotide molecules thiab lawv cov proteins cuam tshuam. Thaum ob lub subunits no koom ua ke, nws tsim cov ribosomes nquag ntawm kev sib txuas ntawm cov protein. Qhov kev koom ua ke ntawm ob lub subunits no tsuas yog ua los ntawm magnesium ions tam sim no hauv cell.
Puas rov tuav pov hwm rov qab xav tau cov neeg tuav pov hwm rov qab?
Cov tuam txhab tuav pov hwm rov qab feem ntau yuav rov ua pov hwm lawv tus kheej, lub sij hawm hu ua retrocession. Ntau txoj cai tau nthuav tawm ntawm ntau tus neeg tuav pov hwm rov qab. Nyob rau hauv rooj plaub no, qhov kev sib pauv yuav koom nrog tus thawj coj rov tuav pov hwm uas yuav sib tham txog cov ntsiab lus ntawm txoj cai uas lwm tus neeg tuav pov hwm rov qab yuav koom nrog.
Thaum cov tuam txhab tuav pov hwm yuav kev pov hwm los ntawm cov tuam txhab tuav pov hwm ncaj qha?
Hauv cov ntsiab lus yooj yim, kev tuav pov hwm rov qab yog kev tuav pov hwm rau cov tuam txhab tuav pov hwm muab hauv daim ntawv cog lus ntawm kev them nyiaj tsis yog daim ntawv cog lus lav. Feem ntau, tus neeg tuav pov hwm ncaj qha yuav tsum xub them qhov poob thiab tom qab ntawd nrhiav nyiaj rov qab rau qhov kev poob ntawd los ntawmnws cov nyiaj rov qab.
Yuav tuav lossis yuav tuav?
Tus tswv cuab Senior. Feem ntau, Nws yuav tuav lub rooj sib thamtxhais tau tias thaum lub sijhawm hais lus nws tau txiav txim siab lawm, tej zaum dhau los, lub rooj sib tham yuav muaj. Thaum peb tab tom txiav txim siab rau lub rooj sib tham, peb hais tias Nws yuav tuav lub rooj sib tham.
Leej twg nrhiav tau ribosomal rna?
Lub ribosome yog ib qho nyuaj molecule ua los ntawm ribosomal RNA molecules thiab cov proteins uas tsim lub Hoobkas rau cov protein synthesis hauv hlwb. Xyoo 1955, George E. Palade nrhiav pom ribosomes thiab piav qhia lawv li cov khoom me me hauv cytoplasm uas nyiam cuam tshuam nrog endoplasmic reticulum membrane.
