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It is a protein produced by the pancreas and is processed to form the hormone, insulin, which helps to regulate blood sugar levels.

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What are some identifiers for the c peptide?

The connecting peptide, or C-peptide, is a short 31-amino-acid protein that connects insulin's A-chain to its B-chain in the proinsulin molecule. In the insulin synthesis pathway, first preproinsulin is secreted from the beta cells of the pancreas with an A-chain, a C-peptide, a B-chain, and a signal sequence. The signal sequence is cleaved from the N-terminus of the peptide by a signal peptidase, leaving proinsulin. Then the C-peptide is removed, leaving the A-chain and B-chain that constitute the insulin molecule.


What are precursor proteins?

Some proteins are made as its inactive form known as Zymogens (proenzyme). classical example are trpsinogen, chymotrypsinogen and even insulin as proinsulin. They have to undergo a chemical change to become active enzyme trypisn, chymotrypis or insulin.


What make insulin?

Insulin is produced in the pancreas and released when any of the several stimuli is detected. The stimuli include ingested protein and glucose in the blood produced from digested food. Carbohydrate can be polymers of simple sugars or the simple sugars themselves. If the carbohydrate includes glucose then that glucose will be absorbed into the blood stream and blood glucose level will begin to rise. In target cells, insulin initiates a signal transduction, which has the effect of increasing glucose uptake and storage. Finally, insulin is degraded, terminating the response.Insulin undergoes extensive posttranslational modification along the production pathway. Production and secretion are largely independent; prepared insulin is stored awaiting secretion. Both C-peptide and mature insulin are biologically active. Cell components and proteins in this image are not to scale. In mammals, insulin is synthesized in the pancreas within the beta cells (β-cells) of the islets of Langerhans. One million to three million islets of Langerhans (pancreatic islets) form the endocrine part of the pancreas, which is primarily an exocrine gland. The endocrine portion only accounts for 2% of the total mass of the pancreas. Within the islets of Langerhans, beta cells constitute 60-80% of all the cells. In beta cells, insulin is synthesized from the proinsulin precursor molecule by the action of proteolytic enzymes, known as prohormone convertases (PC1 and PC2), as well as the exoprotease carboxypeptidase E. These modifications of proinsulin remove the center portion of the molecule (ie, C-peptide), from the C- and N- terminal ends of proinsulin. The remaining polypeptides (51 amino acids in total), the B- and A- chains, are bound together by disulfide bonds/disulphide bonds. Confusingly, the primary sequence of proinsulin goes in the order "B-C-A", since B and A chains were identified on the basis of mass, and the C peptide was discovered after the others.


Why does the Anfinsen experiment not work using mature insulin?

Proinsulin (a precursor to insulin) is made up of a polypeptide chain known in three parts as A, B and C. When proinsulin is converted to insulin the C part is cleaved off, leaving A and B attached only by disulfide bridges (C was in the middle of the polypeptide). In the Anfinsen experiment the beta-mercaptoethanol breaks these disulfide bridges, you now have two free, separate polypeptide chains. Thus there is no reason for them to go back together the way they originally were, just chance! It's not like a single polypeptide where the intermolecular interactions would determine how it refolded.


How is insulin transported from er to the surface of a cell?

Insulin is synthesized in the endoplasmic reticulum (ER) as a precursor protein known as proinsulin. It is then transported to the Golgi apparatus, where it undergoes post-translational modifications, including cleavage into active insulin and C-peptide. From the Golgi, insulin is packaged into secretory vesicles that move towards the cell surface. Upon receiving the appropriate signals, these vesicles fuse with the plasma membrane, releasing insulin into the extracellular space.


What is the pathway of the synthesis and secretion of insulin?

Insulin synthesis begins in the pancreas's beta cells, where preproinsulin is synthesized in the rough endoplasmic reticulum (RER). It is then processed into proinsulin, which is transported to the Golgi apparatus, where it matures into insulin through the removal of the C-peptide. The mature insulin is stored in secretory granules until glucose levels rise, triggering exocytosis, which releases insulin into the bloodstream. This process helps regulate blood sugar levels effectively.


How can proteins be activated and processed and degraded give an example of each?

Proteins can be activated by post-translational modifications, such as phosphorylation or cleavage, leading to conformational changes that enable their function. For instance, phosphorylation of a transcription factor can activate its DNA-binding ability. Proteins are processed by the addition of molecular tags (e.g., signal peptides) for correct localization within the cell. An example is the processing of proinsulin into insulin in the pancreas. Proteins are degraded by the ubiquitin-proteasome system, where ubiquitin tags signal proteins for degradation by the proteasome. An example is the degradation of cyclins after cell cycle progression.


Which cells secrete insulin?

<liver cells, muscles cells but not nerve cells> You have to remember that under regular conditions the production of ATP is derived from glucose. Every cell needs ATP to function for that reason all cells in the body need glucose to function under regular conditions. Since insulin is the hormone that signals cells to take up glucose and glucose is needed to efficiently produce ATP it makes sense that virtually every cell in the body responds to insulin including nerve cells.


Insulin produced by bacteria?

Bacteria is just a vessel. The insulin gene is originally from the human body. The particular strand is first isolated by cutting them out using Restriction Enzyme. Then we use DNA Ligase to find a similar site in the bacteria's DNA, we insert the Insulin gene, then back into the bacteria.


How can i get rid of diabetes type 1?

One so-called 'incurable disease' that afflicts millions of people around the world is type 1 diabetes. Unlike type 2 diabetes, where the body becomes resistant to its own insulin, type 1 is characterized by the inability of the body to produce enough insulin, as the beta cells within the pancreas which are responsible for the production of insulin (and the proinsulin from which it is made) are either destroyed or seriously impaired. This can happen due to autoimmune issues, bacterial or viral infections, incompatible foods in the diet and chemical exposures (or a combination of any one or more of these factors), to name but a few major triggers. And yet, plenty of peer-reviewed and published research now indicates that plant compounds, including many found within commonly consumed foods, are capable of stimulating beta cell regeneration within the pancreas, and as a result may be potentially provide a cure - truly a four letter word, as far as the profit-based model of medicine goes, which thrives on the concept of the incurability of the disease-afflicted human body in favor of symptom management. ---- See more at>>> big-diabetes-lie.arealreviews.com


What are the advantages of using bacteria which contain human insulin genes to produce insulin?

it is most desirable to produce hInsulin by rDNA technology as you dont want to extract insulin from cadavers that could be infected or use insulin extracted from pig as it be rejected in your body. even more you can design the inslin chain to be the way you want it to be.... like you can surpass the proinsulin stage and make the active insulin chain.


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