Gastricsin is an aspartic proteinase that belongs to the peptidase family A1. The encoded protein is a digestive enzyme that is produced in the stomach and constitutes a major component of the gastric mucosa. This protein is also secreted into the serum. This protein is synthesized as an inactive zymogen that includes a highly basic prosegment. This enzyme is converted into its active mature form at low pH by sequential cleavage of the prosegment that is carried out by the enzyme itself.
Polymorphisms in this gene are associated with susceptibility to gastric cancers. Serum levels of this enzyme are used as a biomarker for certain gastric diseases including Helicobacter pylori related gastritis.
^Hayano T, Sogawa K, Ichihara Y, Fujii-Kuriyama Y, Takahashi K (January 1988). "Primary structure of human pepsinogen C gene". J. Biol. Chem. 263 (3): 1382–5. PMID3335549.
^Pals G, Azuma T, Mohandas TK, Bell GI, Bacon J, Samloff IM, Walz DA, Barr PJ, Taggart RT (February 1989). "Human pepsinogen C (progastricsin) polymorphism: evidence for a single locus located at 6p21.1-pter". Genomics. 4 (2): 137–48. doi:10.1016/0888-7543(89)90292-9. PMID2567697.
^Taggart RT, Cass LG, Mohandas TK, Derby P, Barr PJ, Pals G, Bell GI (January 1989). "Human pepsinogen C (progastricsin). Isolation of cDNA clones, localization to chromosome 6, and sequence homology with pepsinogen A". J. Biol. Chem. 264 (1): 375–9. PMID2909526.
Sánchez LM, Freije JP, Merino AM, et al. (1992). "Isolation and characterization of a pepsin C zymogen produced by human breast tissues.". J. Biol. Chem. 267 (34): 24725–31. PMID1280267.
Ichinose M, Miki K, Wong RN, et al. (1991). "Methylation and expression of human pepsinogen genes in normal tissues and their alteration in stomach cancer.". Jpn. J. Cancer Res. 82 (6): 686–92. doi:10.1111/j.1349-7006.1991.tb01904.x. PMID1906854.
Athauda SB, Tanji M, Kageyama T, Takahashi K (1990). "A comparative study on the NH2-terminal amino acid sequences and some other properties of six isozymic forms of human pepsinogens and pepsins.". J. Biochem. 106 (5): 920–7. PMID2515193.
Westerveld BD, Pals G, Bosma A, et al. (1987). "Gastric proteases in Barrett's esophagus.". Gastroenterology. 93 (4): 774–8. PMID3305135.
Foltmann B, Jensen AL (1983). "Human progastricsin. Analysis of intermediates during activation into gastricsin and determination of the amino acid sequence of the propart.". Eur. J. Biochem. 128 (1): 63–70. doi:10.1111/j.1432-1033.1982.tb06931.x. PMID6816595.
Moore SA, Sielecki AR, Chernaia MM, et al. (1995). "Crystal and molecular structures of human progastricsin at 1.62 A resolution.". J. Mol. Biol. 247 (3): 466–85. doi:10.1006/jmbi.1994.0154. PMID7714902.
Aabakken L, Axelsson CK, Szecsi PB (1993). "Pepsinogen A and C serum levels in relation to acute NSAID-associated mucosal lesions in healthy volunteers.". Scand. J. Gastroenterol. 28 (6): 557–60. doi:10.3109/00365529309098266. PMID8322031.
Aoki T, Tomaki E, Morikawa J, et al. (1997). "Purification of pepsinogens from human urine and electrophoretic analysis by caseogram print.". Biochem. Mol. Biol. Int. 39 (6): 1147–56. doi:10.1080/15216549600201332. PMID8876968.
Diamandis EP, Nadkarni S, Bhaumik B, et al. (1997). "Immunofluorometric assay of pepsinogen C and preliminary clinical applications.". Clin. Chem. 43 (8 Pt 1): 1365–71. PMID9267315.
Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, et al. (1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library.". Gene. 200 (1-2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID9373149.
Khan AR, Cherney MM, Tarasova NI, James MN (1998). "Structural characterization of activation 'intermediate 2' on the pathway to human gastricsin.". Nat. Struct. Biol. 4 (12): 1010–5. doi:10.1038/nsb1297-1010. PMID9406551.