Proglucagon is a protein that is cleaved from preproglucagon. Preproglucagon in humans is encoded by the GCGgene.
Proglucagon is a precursor of glucagon, and several other components. It is generated in the alpha cells of the pancreas and in the intestinal L cells in the distal ileum and colon. It is also cleaved into the following components in different organs:
Signal peptide (1-20) – removed from preproglucagon to from proglucagon
^Pollock HG, Hamilton JW, Rouse JB, Ebner KE, Rawitch AB (July 1988). "Isolation of peptide hormones from the pancreas of the bullfrog (Rana catesbeiana). Amino acid sequences of pancreatic polypeptide, oxyntomodulin, and two glucagon-like peptides". The Journal of Biological Chemistry. 263 (20): 9746–51. PMID3260236.