Qhov sib txawv tseem ceeb ntawm Rho dependent thiab Rho kev txiav tawm ywj siab yog tias hauv Rho qhov kev txiav txim siab, Rho yam cuam tshuam nrog cov ntawv sau tseg thiab txiav tawm cov ntawv sau los ntawm kev rhuav tshem hydrogen bonds ntawm tus qauv thiab cov ntawv sau, thaum Rho ywj siab txiav tawm txiav tawm cov ntawv sau los ntawm tsim ib lub voj voos plaub hau thiab tom qab ntawd U nplua nuj cheeb tsam hauv cov ntawv sau tseg.
Kev txhais lus yog ib qho ntawm ob theem ntawm cov noob qhia. Nws yog cov txheej txheem uas tsim cov mRNA ib ntus los ntawm cov ntaub ntawv caj ces zais hauv DNA ntu ntawm cov noob. Transcription yuav siv sij hawm qhov chaw ntawm peb kauj ruam: pib, elongation thiab termination. RNA polymerase enzyme khi rau kev txhawb nqa ib ntus ntawm cov noob thiab pib catalyzing cov synthesis ntawm RNA strand. Txog thaum pom cov terminator ib ntus, RNA polymerase ntxiv nucleotides thiab tsim RNA strand. Hauv prokaryotes, kev txiav tawm tshwm sim los ntawm ob lub tswv yim txiav tawm loj: Rho nyob ntawm kev txiav tawm thiab Rho ywj siab txiav. Rho factor yog cov protein uas muaj cov haujlwm helicase.
Rho Dependent Termination yog dab tsi?
Rho nyob ntawm kev txiav tawm yog ib qho ntawm ob hom kev txiav tawm kev txiav tawm uas tshwm sim hauv prokaryotes. Rho factor yog cov protein uas muaj cov haujlwm helicase.
Daim duab 01: Rho Dependent Termination
Rho protein khi nrog RNA cov ntawv sau tseg thiab txav mus raws RNA polymerase hauv 5'-3' kev taw qhia, txhawb kev sib cais ntawm hydrogen bonds ntawm DNA qauv thiab RNA cov ntawv sau tseg. Thaum Rho qhov tseem ceeb mus txog cov npuas transcription, nws rub DNA / RNA hybrid sib nrug thiab tso tawm cov ntawv sau los ntawm cov npuas transcription. Thaum qhov no tshwm sim, nws xaus qhov kev hloov pauv.
Rho Independent Termination yog dab tsi?
Rho kev txiav tawm ywj pheej yog qhov thib ob lub tswv yim uas txiav tawm prokaryotic transcription. Feem ntau, ib cheeb tsam terminator muaj qhov rov qab ua ntu zus. Tam sim ntawd tom qab qhov rov qab ua ntu zus, muaj thaj tsam Adenine nplua nuj (AAAA). Thaum RNA polymerase txav mus tom ntej, nws tsim cov kab ke mRNA. Txij li thaum ob lub cheeb tsam yog complementary nyob rau hauv inverted rov ua ib theem zuj zus cheeb tsam, nws tsim ib tug hairpin voj qauv vim hydrogen bonding. Cov cheeb tsam tom ntej yuav yog thaj tsam U nplua nuj. Cov qauv plaub hau tso tseg RNA polymerase kev ua haujlwm.
Daim duab 02: Rho Kev Txiav Txim Siab
Ntxiv mus, hauv thaj tsam U nplua nuj, muaj kev cuam tshuam tsis zoo ntawm U hauv paus ntawm cov ntawv sau thiab A hauv paus ntawm tus qauv. Cov nyiaj tsis muaj zog Adenine-Uracil no ua rau tsis muaj zog ntawm DNA qauv thiab RNA cov ntawv sau tseg thiab sib cais. Thaum kawg, cov ntawv sau cia liberates los ntawm qhov chaw sau ntawv.
Dab tsi yog qhov zoo sib xws ntawm Rho Dependent thiab Rho Independent Termination?
- Rho dependent thiab Rho ywj siab txiav tawm yog ob lub tswv yim txiav tawm loj pom hauv prokaryotes.
- Ob daim ntawv tso tawm cov ntawv sau los ntawm DNA tus qauv los txiav tawm cov ntawv sau.
Qhov txawv ntawm Rho Dependent thiab Rho Kev Txiav Txim Siab yog dab tsi?
Rho nyob ntawm kev txiav tawm yog kho los ntawm Rho protein thaum Rho kev txiav tawm ywj siab tshwm sim los ntawm kev tsim cov plaub hau lub voj voog. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm Rho dependent thiab Rho ywj siab txiav. Tsis tas li ntawd, Rho protein siv ATP zog thaum Rho ywj siab txiav tsis koom nrog Rho protein thiab tsis siv ATP zog. Yog li, qhov no kuj yog qhov sib txawv tseem ceeb ntawm Rho dependent thiab Rho ywj siab txiav tawm.
Cov hauv qab no infographic qhia ntau qhov kev sib piv ntsig txog qhov sib txawv ntawm Rho dependent thiab Rho kev txiav tawm ywj siab.
Summary – Rho Dependent vs Rho Independent Termination
Rho nyob thiab Rho kev txiav tawm ywj pheej yog ob lub ntsiab lus txiav tawm cov txheej txheem tshwm sim hauv prokaryotes. Ib qho Rho protein yog lub luag haujlwm rau qhov kev txiav tawm ntawm Rho nyob ntawm qhov kev txiav tawm. Nyob rau hauv sib piv, Rho ywj siab txiav tawm tshwm sim los ntawm ib tug tsim ntawm lub hairpin voj qauv. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm Rho dependent thiab Rho ywj siab txiav tawm.
