Does post-translational control occur in prokaryotes?
Gene expression in prokaryotes is mostly regulated at the transcriptional level (some epigenetic and post-translational regulation is also present), whereas in eukaryotic cells, gene expression is regulated at the epigenetic, transcriptional, post-transcriptional, translational, and post-translational levels.
What does post-transcriptional control?
Post-transcriptional regulation is the control of gene expression at the RNA level. It occurs once the RNA polymerase has been attached to the gene’s promoter and is synthesizing the nucleotide sequence.
What are the main types of post-transcriptional control?
In Summary: Post-TransCRIPTIONAL Control of Gene Expression Post-transcriptional control can occur at any stage after transcription, including RNA splicing, nuclear shuttling, and RNA stability. Once RNA is transcribed, it must be processed to create a mature RNA that is ready to be translated.
What is an example of post-translational control?
Such post-translational modifications are generally reversible, one enzyme adds the modifying group and another can remove it. For example, proteins are phosphorylated by enzymes known as protein kinases, while protein phosphotases remove such phosphate groups.
How is translation regulated in prokaryotes?
Translation in prokaryotes is usually regulated by blocking access to the initiation site. This is accomplished via base-paired structures (within the mRNA itself, or between the mRNA and a small trans-acting RNA) or via mRNA-binding proteins. Classic examples of each mechanism are described.
Which of the following applies best to post-translational control?
The description that best applies to post-translational control is: regulation of gene expression after translation.
What happens during post-transcriptional processing?
Post-transcriptional modifications of pre-mRNA, such as capping, splicing, and polyadenylation, take place in the nucleus. After these modifications have been completed, the mature mRNA molecules have to be translocated into the cytoplasm, where protein synthesis occurs.
What are the three types of post-transcriptional processing?
In this section, we will discuss the three processes that make up these post- transcriptional modifications: 5′ capping, addition of the poly A tail, and splicing.
Where does translational control occur?
A large number of accessory factors that assist the ribosome during initiation, elongation, and termination of translation are required for protein synthesis. Cap-dependent translational control occurs mainly during the initiation step, involving eukaryotic initiation factors (eIFs) and accessory proteins.
How does gene regulation work in prokaryotes?
The regulation of gene expression in prokaryotic cells occurs at the transcriptional level. There are two majors kinds of proteins that control prokaryotic transcription: repressors and activators. Repressors bind to an operator region to block the action of RNA polymerase.
What is involved in post transcriptional control quizlet?
What is involved in post transcriptional control? Control of RNA splicing, control of RNA shuttling, and control of RNA stability.
Do prokaryotes have post-transcriptional modification?
RNAs from eukaryotes undergo post-transcriptional modifications including: capping, polyadenylation, and splicing. These events do not occur in prokaryotes.