What is a post translational control?
Post-translational control can be defined as the mechanisms by which protein structure can be altered after translation. Alternatively, the sequence or number of the amino acids in a protein can be altered. These changes can alter the structure or function of the protein, or they can target it for destruction.
What happens during post translational control?
In Summary: Post-TransCRIPTIONAL Control of Gene Expression This involves the removal of introns that do not code for protein. Spliceosomes bind to the signals that mark the exon/intron border to remove the introns and ligate the exons together. Once this occurs, the RNA is mature and can be translated.
Which of the following is an example of post translational control?
The removal of introns and alternative splicing of exons is an example of post-transcriptional control of gene expression.
What is involved in post-transcriptional control?
Posttranscriptional regulation includes alternative splicing (which determines the translated mRNA sequence itself), stability of the mRNA strand (which can be actively degraded in a regulated manner), transport of the mRNA to the ribosome, and binding of mRNA to the ribosome.
What does the process of post translational control refers to quizlet?
Post translational control refers to: Regulation of gene expression after translation. Prokaryotic cells lack a nucleus. Therefore, the genes in prokaryotic cells are: Transcribed and translated almost simultaneously.
Where does post translational regulation occur?
PTMs occur at distinct amino acid side chains or peptide linkages, and they are most often mediated by enzymatic activity. Indeed, it is estimated that 5% of the proteome comprises enzymes that perform more than 200 types of post-translational modifications.
Where does post translational occur?
Post-translational modifications can occur on the amino acid side chains or at the protein’s C- or N- termini. They can extend the chemical repertoire of the 20 standard amino acids by modifying an existing functional group or introducing a new one such as phosphate.
What is meant by post-translational processing or modification?
Post-translational modification (PTM) refers to the covalent and generally enzymatic modification of proteins following protein biosynthesis. Other forms of post-translational modification consist of cleaving peptide bonds, as in processing a propeptide to a mature form or removing the initiator methionine residue.
Which of the following applies best to post translational control?
regulation of gene expression after translation
The description that best applies to post-translational control is: regulation of gene expression after translation.
What is the process of translation quizlet?
The process of making protein from the mRNA is called translation. Translation is carried out by the ribosome, which binds to the mRNA and binds tRNA, which recognizes the codons on the mRNA and brings the appropriate amino acid with it.
How does post translational control of gene expression work?
In Summary: Post-Translational Control of Gene Expression. The RNA stability can be increased, leading to longer residency time in the cytoplasm, or decreased, leading to shortened time and less protein synthesis. RNA stability is controlled by RNA-binding proteins (RPBs) and microRNAs (miRNAs).
Which is the first stage of post transcriptional control?
RNA splicing, the first stage of post-transcriptional control. In eukaryotic cells, the RNA transcript often contains regions, called introns, that are removed prior to translation. The regions of RNA that code for protein are called exons (Figure 1).
How are post translational modifications and POS transcriptional modifications different?
Post translational modifications are alterations done to the protein product coded by a specific RNA sequence, this happens outside the cell nucleus. Pos transcriptional modifications are alterations done to the RNA prodcut that results from “reading” a gene in the DNA sequence, this happens inside the nucleus.