Qhov sib txawv tseem ceeb ntawm kev tswj hwm thiab kev tawm tsam cov protein yog tias cov protein tswj tau tuaj yeem txhawb lossis cuam tshuam kev hloov pauv ntawm cov noob. Meanwhile, tus repressor protein inhibits kev qhia ntawm ib los yog ntau yam noob.
Ua ntej mus ntxiv rau hauv kev sib tham ntawm qhov sib txawv ntawm kev tswj hwm thiab kev tawm tsam cov protein, cia peb tham luv luv txog kev tswj cov noob. Gene yog ib qho tshwj xeeb nucleotide ib ntus uas cov ntaub ntawv caj ces raug muab zais txhawm rau txhawm rau tsim cov protein. Gene qhia tuaj yeem tswj hwm ntau txoj hauv kev. Los ntawm cov txheej txheem sib txawv, cov hlwb tswj cov kev qhia ntawm cov noob thiab lawv cov theem ntawm kev qhia. Feem ntau, cov kev cai gene tshwm sim ntawm qib transcription. Regulatory protein thiab repressor protein yog ob hom proteins koom nrog hauv kev tswj cov noob ntawm qib transcription. Cov kev tswj hwm cov proteins thiab cov tshuaj tiv thaiv cov protein khi rau ib ntu tshwj xeeb ze ntawm cov noob thiab cuam tshuam rau kev hloov pauv ntawm cov noob.
Txoj Cai Protein yog dab tsi?
Regulatory protein yog cov protein uas tswj cov kev hloov pauv ntawm cov noob. Cov proteins no tuaj yeem ntxias lossis inhibit qhov kev hloov pauv ntawm cov noob. Cov kab mob kab mob muaj nyob ua cov neeg ua haujlwm lossis pawg ntawm cov noob ua haujlwm hauv ib tus neeg txhawb nqa. Txhua operon muaj cov txheej txheem DNA tswj hwm uas muab cov chaw rau kev sib txuas ntawm cov proteins tswj hwm. Thaum cov kev tswj hwm cov proteins khi nrog cov noob, lawv tuaj yeem cuam tshuam lossis txhawb nqa cov ntawv sau. Yog li, cov txheej txheem tswj hwm no muaj peev xwm tig los yog tawm ntawm cov noob. Feem ntau, kev tswj hwm cov protein ua los ntawm kev pab lossis thaiv cov enzyme RNA polymerase uas ua rau cov ntaub ntawv sau tseg.
Daim duab 01: Gene Regulation
Txoj cai cov noob cai rau kev tswj hwm cov proteins. Feem ntau, kev tswj hwm cov protein khi nrog cov molecules me uas tuaj yeem ua rau lawv ua haujlwm lossis tsis ua haujlwm los ntawm kev hloov lawv lub peev xwm los khi nrog DNA. Hauv cov lus yooj yooj yim, cov txheej txheem tswj hwm tau qhib lossis kaw lawv tus kheej los ntawm kev khi nrog cov molecules me me. Kev khi ntawm cov molecules me me hloov lawv cov duab, ua rau kev khi nrog DNA.
Txoj cai cov proteins thiab cov kev tswj cov noob sib txawv ntawm cov prokaryotes thiab eukaryotes. Hauv prokaryotes, feem ntau cov kev tswj hwm cov protein yog tshwj xeeb rau ib lub noob.
Repressor Protein yog dab tsi?
Repressor protein yog cov protein uas khi nrog DNA lossis RNA thiab inhibits qhov kev qhia ntawm ib lossis ntau cov noob.cov repressor proteins feem ntau khi nrog rau cheeb tsam txhawb los yog cuam tshuam silencers. DNA binding repressor proteins tiv thaiv kev khi ntawm RNA polymerase rau kev txhawb nqa ntawm cov noob thiab nres qhov kev hloov pauv ntawm cov noob sib lawv liag rau hauv mRNA. Ntawm qhov tod tes, RNA binding repressor proteins thaiv kev txhais ntawm mRNA rau hauv cov proteins.
Daim duab 02: Repressor protein
Methionine repressor MetJ yog ib qho piv txwv ntawm cov protein repressor. Ntxiv mus, lactose repressor protein (LacI) yog lwm qhov piv txwv ntawm cov protein repressor uas tswj kev qhia txog lactose metabolic noob.
Dab tsi yog qhov zoo sib xws ntawm Kev Tswj Xyuas thiab Kev Tiv Thaiv Protein?
- Ob txoj cai tswj hwm thiab kev tawm tsam cov protein khi nrog cov cheeb tsam tshwj xeeb ntawm cov noob.
- Lawv tswj gene expression.
- Qee cov kev tswj hwm cov protein yog cov tshuaj tiv thaiv.
Dab tsi yog qhov txawv ntawm Kev Tswj Xyuas thiab Kev Tiv Thaiv Protein?
Regulatory protein yog ib qho protein uas induces lossis inhibits qhov kev qhia ntawm cov noob. Repressor protein yog ib qho protein uas suppresses transcription ntawm cov noob. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm kev tswj hwm thiab kev tawm tsam cov protein. Ntxiv mus, repressor protein yog ib hom kev tswj hwm cov protein uas cuam tshuam nrog kev tswj tsis zoo ntawm cov noob.
Summary – Regulatory vs Repressor Protein
Kev tswj hwm cov protein yog cov protein uas khi nrog cov txheej txheem tswj hwm ntawm cov noob thiab tswj cov noob qhia. Qee cov kev tswj hwm cov proteins yog cov activators, uas ua rau muaj kev hloov pauv ntawm cov noob los ntawm kev pab RNA polymerase khi rau tus txhawb nqa. Tab sis, qee qhov kev tswj hwm cov proteins yog cov neeg tawm tsam, uas txo cov kev sau los ntawm kev thaiv RNA polymerase los ntawm kev mus rau pem hauv ntej ntawm DNA. Meanwhile, repressor proteins yog proteins uas khi nrog DNA los yog RNA thiab suppress lub noob qhia. Yog li, qhov no qhia txog qhov sib txawv ntawm kev tswj hwm thiab kev tawm tsam cov protein.
