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Proinsulin: Products

Proinsulin is synthesized as a single chain, 110 amino acid (aa) preproprecursor that contains a 24 aa signal sequence and an 86 aa proinsulin. Following removal of the signal peptide, the proinsulin peptide undergoes further proteolysis to generate mature insulin, a 51 aa disulfide-linked dimer that consists of a 30 aa B chain (aa 25 - 54) bound to a 21 aa A chain (aa 90 - 110). The 34 aa intervening peptide (aa 55 - 89) that connects the B and A chains is termed the C-peptide. Human proinsulin shares 84% and 80% aa sequence identity with rat and bovine proinsulin, respectively. Most of the sequence variation between species occurs in the region of the C-peptide. This peptide generates a structural conformation that allows for the correct formation of the intrachain disulphide bonds.

Insulin is a molecule that facilitates the cellular uptake of glucose. This is accomplished by regulating the appearance of membrane glucose transporters. Low insulin levels or lack of insulin are associated with type 2 and type 1 diabetes mellitus, respectively. These conditions are associated with an increased risk for microvascular complications such as retinopathy, nephropathy, and peripheral neuropathy.

Proinsulin also circulates, but its physiological role is less well understood. It has approximately 25% of the activity of mature insulin, but it would seem unlikely to be a natural substitute for insulin. In type 2 diabetes, an elevated proinsulin-to-insulin ratio in the circulation is a well-known abnormality. This abnormality may represent either compromised proteolytic processing or a general inability to process increased levels of insulin precursor. Proinsulin will stimulate amylin secretion by beta-cells, and amyloid formation in pancreatic islets that promotes decreased beta-cell function. Studies also suggest that fasting serum proinsulin may be a better predictor of future type 2 diabetes than fasting insulin levels in obese children.

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Human/Mouse Proinsulin Antibody

Clonality: Monoclonal
Host: Mouse IgG2a Clone #253627
Applications: Flow, ICC/IF
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MAB13361

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Human/Mouse Proinsulin Antibody Immunocytochemistry

Human/Mouse Proinsulin Biotinylated Antibody

Clonality: Monoclonal
Host: Mouse IgG2a Clone #253627
Applications: Flow, ICC/IF
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BAM13361

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