Where Is C Peptide Cleaved?

The signal sequence is cleaved from the N-terminus of the peptide by a signal peptidase, leaving proinsulin

proinsulin
Structure. Proinsulin is made up of 86 residues in humans (81 in cows), and formed by three distinct chains. The A chain, B chain, and the area connecting the two named the C peptide.
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Where is insulin cleaved in the cell?

Insulin, a 51-amino acid peptide hormone, is cleaved from preproinsulin and subsequently from proinsulin by proteases in the secretory vesicles of pancreatic β cells (Sanger & Tuppy, 1951a, 1951b).

How C-peptide is removed?

C-peptide is removed in the Golgi apparatus from proinsulin resulting in the formation of the mature insulin molecule with both alpha and beta chains bound together by disulfide bonds.

Maya Lin-Takahashi

Maya Lin-Takahashi

Consumer Tech & Gadget Reviewer

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.