Video: Yuav ua li cas rho tawm rho tawm haujlwm?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Rho dependent termination yog ib qho ntawm ob hom kev txiav txim nyob rau hauv prokaryotic transcription, lwm yam yog intrinsic (los yog Rho - ywj siab). Tom qab khi rau cov saw tshiab RNA, ρ yam txav mus raws cov molecule hauv 5'-3' kev taw qhia thiab txhawb kev sib cais los ntawm DNA qauv thiab RNA polymerase.
Ib yam li ntawd, yuav ua li cas rho tawm kev txiav tawm rho tawm txawv ntawm rho tus txiav tawm?
DNA Structure thiab Replication Qhov tseeb (los yog rho - ywj siab ) kev txiav txim yog thaum RNA tsim cov qauv plaub hau uas tshem RNA Polymerase thiab nres kev sau ntawv . Rho - nyob ntawm kev txiav txim tshwm sim thaum lub rho protein disassociates RNA Polymerase thiab txav nws tawm ntawm lub template.
Tsis tas li ntawd, dab tsi muab lub zog rau Rho nyob ntawm cov saw txiav? Rho - nyob ntawm kev txiav txim tshwm sim los ntawm kev khi ntawm Rho rau ribosome-free mRNA, C-nplua nuj qhov chaw yog cov neeg sib tw zoo rau kev khi. Rho's ATPase yog qhib los ntawm Rho -mRNA khi, thiab muab lub zog rau Rho translocation raws mRNA; translocation yuav tsum zawv zawg ntawm cov lus mus rau hauv lub hauv paus qhov ntawm lub hexamer.
Tsis tas li ntawd, rho dependent transcription termination xav tau dab tsi?
Escherichia coli protein Rho yog xav tau rau Factor- dependent transcription termination los ntawm RNA polymerase thiab yog qhov tseem ceeb rau kev ua haujlwm ntawm lub cell. Nws yog homohexameric protein uas paub txog thiab khi zoo dua rau C-nplua nuj qhov chaw hauv RNA transcribed.
Rho termination yog dab tsi?
Ib ρ factor ( Rho factor) yog prokaryotic protein koom nrog kev txiav txim ntawm transcription. Rho ua haujlwm ua ib qho tseem ceeb rau RNA polymerase. Muaj ob hom transcriptional kev txiav txim nyob rau hauv prokaryotes, rho - nyob ntawm kev txiav txim thiab qhov tseeb kev txiav txim (tseem hu ua Rho - ywj siab kev txiav txim ).
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