In rare cases, the mRNA transcript can be “edited” after it is transcribed. The three most important steps of pre-mRNA processing are the addition of stabilizing and signaling factors at the 5′ and 3′ ends of the molecule, and the removal of intervening sequences that do not specify the appropriate amino acids. Pre-mRNAs are first coated in RNA-stabilizing proteins these protect the pre-mRNA from degradation while it is processed and exported out of the nucleus. This polymerase transcribes a variety of structural RNAs that includes the 5S pre-rRNA, transfer pre-RNAs (pre-tRNAs), and small nuclear pre-RNAs.Īfter transcription, eukaryotic pre-mRNAs must undergo several processing steps before they can be translated. RNA polymerase III is also located in the nucleus.RNA polymerase II is located in the nucleus and synthesizes all protein-coding nuclear pre-mRNAs.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |