SMPDB

Pathway Description

Omeprazole Metabolism Pathway (old)

Homo sapiens

Drug Metabolism Pathway

Created: 2013-09-11

Last Updated: 2025-01-24

Omeprazole, sold as Prilosec. Losec and Zegerid, is a proton pump inhibitor (PPI) class drug that suppresses the final step in gastric acid production, and was the first proton pump inhibitor to e developed. In this pathway, omeprazole is taken orally and is oxidized in the stomach to form the active metabolite of omeprazole. This active metabolite then binds covalently to the potassium-transporting ATPase protein subunits, found at the secretory surface of the gastric parietal cell, preventing any stimulus. Because the drug binds covalently, its effects are dose-dependent and last much longer than similar drugs that bind to the protein non-covalently. This is because additional ATPase enzymes must be created to replace the ones covalently bound by pantoprazole. Omeprazole is used to manage gastroesophageal reflux disease, to prevent stomach ulcers, and can be used to help treat the effects of a H. pylori infection.

References

Omeprazole Pathway (old) References

DiPiro, J.T., Talbert, R.L., Yee, G.C., Matzke, G.R., Wells, B.G, & Posey, M.L. Pharmacotherapy: A pathologic approach. (6th ed) (2005) p.621-623. New York: McGraw-Hill Medical Publishing Division.

Horn J: The proton-pump inhibitors: similarities and differences. Clin Ther. 2000 Mar;22(3):266-80; discussion 265. doi: 10.1016/S0149-2918(00)80032-6.

Pubmed: 10963283

Losec. (2009). e-CPS (online version of Compendium of Pharmaceuticals and Specialties). Retrieved July 1, 2009.

Shi S, Klotz U: Proton pump inhibitors: an update of their clinical use and pharmacokinetics. Eur J Clin Pharmacol. 2008 Oct;64(10):935-51. doi: 10.1007/s00228-008-0538-y. Epub 2008 Aug 5.

Pubmed: 18679668

Ma JY, Song YH, Sjostrand SE, Rask L, Mardh S: cDNA cloning of the beta-subunit of the human gastric H,K-ATPase. Biochem Biophys Res Commun. 1991 Oct 15;180(1):39-45. doi: 10.1016/s0006-291x(05)81251-3.

Pubmed: 1656976

Dunham A, Matthews LH, Burton J, Ashurst JL, Howe KL, Ashcroft KJ, Beare DM, Burford DC, Hunt SE, Griffiths-Jones S, Jones MC, Keenan SJ, Oliver K, Scott CE, Ainscough R, Almeida JP, Ambrose KD, Andrews DT, Ashwell RI, Babbage AK, Bagguley CL, Bailey J, Bannerjee R, Barlow KF, Bates K, Beasley H, Bird CP, Bray-Allen S, Brown AJ, Brown JY, Burrill W, Carder C, Carter NP, Chapman JC, Clamp ME, Clark SY, Clarke G, Clee CM, Clegg SC, Cobley V, Collins JE, Corby N, Coville GJ, Deloukas P, Dhami P, Dunham I, Dunn M, Earthrowl ME, Ellington AG, Faulkner L, Frankish AG, Frankland J, French L, Garner P, Garnett J, Gilbert JG, Gilson CJ, Ghori J, Grafham DV, Gribble SM, Griffiths C, Hall RE, Hammond S, Harley JL, Hart EA, Heath PD, Howden PJ, Huckle EJ, Hunt PJ, Hunt AR, Johnson C, Johnson D, Kay M, Kimberley AM, King A, Laird GK, Langford CJ, Lawlor S, Leongamornlert DA, Lloyd DM, Lloyd C, Loveland JE, Lovell J, Martin S, Mashreghi-Mohammadi M, McLaren SJ, McMurray A, Milne S, Moore MJ, Nickerson T, Palmer SA, Pearce AV, Peck AI, Pelan S, Phillimore B, Porter KM, Rice CM, Searle S, Sehra HK, Shownkeen R, Skuce CD, Smith M, Steward CA, Sycamore N, Tester J, Thomas DW, Tracey A, Tromans A, Tubby B, Wall M, Wallis JM, West AP, Whitehead SL, Willey DL, Wilming L, Wray PW, Wright MW, Young L, Coulson A, Durbin R, Hubbard T, Sulston JE, Beck S, Bentley DR, Rogers J, Ross MT: The DNA sequence and analysis of human chromosome 13. Nature. 2004 Apr 1;428(6982):522-8. doi: 10.1038/nature02379.

Pubmed: 15057823

Gerhard DS, Wagner L, Feingold EA, Shenmen CM, Grouse LH, Schuler G, Klein SL, Old S, Rasooly R, Good P, Guyer M, Peck AM, Derge JG, Lipman D, Collins FS, Jang W, Sherry S, Feolo M, Misquitta L, Lee E, Rotmistrovsky K, Greenhut SF, Schaefer CF, Buetow K, Bonner TI, Haussler D, Kent J, Kiekhaus M, Furey T, Brent M, Prange C, Schreiber K, Shapiro N, Bhat NK, Hopkins RF, Hsie F, Driscoll T, Soares MB, Casavant TL, Scheetz TE, Brown-stein MJ, Usdin TB, Toshiyuki S, Carninci P, Piao Y, Dudekula DB, Ko MS, Kawakami K, Suzuki Y, Sugano S, Gruber CE, Smith MR, Simmons B, Moore T, Waterman R, Johnson SL, Ruan Y, Wei CL, Mathavan S, Gunaratne PH, Wu J, Garcia AM, Hulyk SW, Fuh E, Yuan Y, Sneed A, Kowis C, Hodgson A, Muzny DM, McPherson J, Gibbs RA, Fahey J, Helton E, Ketteman M, Madan A, Rodrigues S, Sanchez A, Whiting M, Madari A, Young AC, Wetherby KD, Granite SJ, Kwong PN, Brinkley CP, Pearson RL, Bouffard GG, Blakesly RW, Green ED, Dickson MC, Rodriguez AC, Grimwood J, Schmutz J, Myers RM, Butterfield YS, Griffith M, Griffith OL, Krzywinski MI, Liao N, Morin R, Palmquist D, Petrescu AS, Skalska U, Smailus DE, Stott JM, Schnerch A, Schein JE, Jones SJ, Holt RA, Baross A, Marra MA, Clifton S, Makowski KA, Bosak S, Malek J: The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC). Genome Res. 2004 Oct;14(10B):2121-7. doi: 10.1101/gr.2596504.

Pubmed: 15489334

Maeda M, Oshiman K, Tamura S, Futai M: Human gastric (H+ + K+)-ATPase gene. Similarity to (Na+ + K+)-ATPase genes in exon/intron organization but difference in control region. J Biol Chem. 1990 Jun 5;265(16):9027-32.

Pubmed: 2160952

Newman PR, Greeb J, Keeton TP, Reyes AA, Shull GE: Structure of the human gastric H,K-ATPase gene and comparison of the 5'-flanking sequences of the human and rat genes. DNA Cell Biol. 1990 Dec;9(10):749-62. doi: 10.1089/dna.1990.9.749.

Pubmed: 2176086

Grimwood J, Gordon LA, Olsen A, Terry A, Schmutz J, Lamerdin J, Hellsten U, Goodstein D, Couronne O, Tran-Gyamfi M, Aerts A, Altherr M, Ashworth L, Bajorek E, Black S, Branscomb E, Caenepeel S, Carrano A, Caoile C, Chan YM, Christensen M, Cleland CA, Copeland A, Dalin E, Dehal P, Denys M, Detter JC, Escobar J, Flowers D, Fotopulos D, Garcia C, Georgescu AM, Glavina T, Gomez M, Gonzales E, Groza M, Hammon N, Hawkins T, Haydu L, Ho I, Huang W, Israni S, Jett J, Kadner K, Kimball H, Kobayashi A, Larionov V, Leem SH, Lopez F, Lou Y, Lowry S, Malfatti S, Martinez D, McCready P, Medina C, Morgan J, Nelson K, Nolan M, Ovcharenko I, Pitluck S, Pollard M, Popkie AP, Predki P, Quan G, Ramirez L, Rash S, Retterer J, Rodriguez A, Rogers S, Salamov A, Salazar A, She X, Smith D, Slezak T, Solovyev V, Thayer N, Tice H, Tsai M, Ustaszewska A, Vo N, Wagner M, Wheeler J, Wu K, Xie G, Yang J, Dubchak I, Furey TS, DeJong P, Dickson M, Gordon D, Eichler EE, Pennacchio LA, Richardson P, Stubbs L, Rokhsar DS, Myers RM, Rubin EM, Lucas SM: The DNA sequence and biology of human chromosome 19. Nature. 2004 Apr 1;428(6982):529-35. doi: 10.1038/nature02399.

Pubmed: 15057824

Highlighted elements will appear in red.

Highlight Compounds

	Active Metabolite of Omeprazole
	Hydrogen
	Omeprazole

Highlight Proteins

	Potassium-transporting ATPase alpha chain 1
	Potassium-transporting ATPase subunit beta

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