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Pathway Description

Thioguanine Metabolism Pathway (old)

Homo sapiens

Drug Metabolism Pathway

Created: 2013-09-18

Last Updated: 2023-09-13

Thioguanine is a purine antimetabolite prodrug closely related to mercaptopurine and similarly inhibits purine metabolism. The thioguanine pathway is shown as a part of the mercaptopurine pathway. Thioguanine exerts cytotoxic effects via incorporation of thiodeoxyguanosine triphosphate into DNA and thioguanosine triphosphate into RNA and inhibition of Ras-related C3 botulinum toxin substrate 1, which induces apoptosis of activated T cells. Once in a cell, thioguanine is converted to thioguanosine monophosphate by hypoxanthine-guanine phosphoribosyltransferase. Thioguanosine monophosphate is then phosphorylated to thioguanosine diphosphate, which is converted via a thiodeoxyguanosine diphosphate intermediate to thiodeoxyguanosine triphosphate. Thiodeoxyguanosine triphosphate is incorporated into DNA causing cytotoxicity. Thioguanosine diphosphate is also converted to thioguanosine triphosphate which is incorporated into RNA. The thioguanosine triphosphate metabolite also inhibits Ras-related C3 botulinum toxin substrate 1, a plasma membrane-associated small GTPase that regulates cellular processes, inducing apoptosis in activated T cells.

References

Thioguanine Pathway (old) References

Nelson, D.L., & Cox, M.M. Lehninger Principles of Biochemistry (3rd ed.) (2000). New York: Worth Publishers.

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Pubmed: 18506437

Stocco G, Cheok MH, Crews KR, Dervieux T, French D, Pei D, Yang W, Cheng C, Pui CH, Relling MV, Evans WE: Genetic polymorphism of inosine triphosphate pyrophosphatase is a determinant of mercaptopurine metabolism and toxicity during treatment for acute lymphoblastic leukemia. Clin Pharmacol Ther. 2009 Feb;85(2):164-72. doi: 10.1038/clpt.2008.154. Epub 2008 Aug 6.

Pubmed: 18685564

Jolly DJ, Okayama H, Berg P, Esty AC, Filpula D, Bohlen P, Johnson GG, Shively JE, Hunkapillar T, Friedmann T: Isolation and characterization of a full-length expressible cDNA for human hypoxanthine phosphoribosyl transferase. Proc Natl Acad Sci U S A. 1983 Jan;80(2):477-81. doi: 10.1073/pnas.80.2.477.

Pubmed: 6300847

Edwards A, Voss H, Rice P, Civitello A, Stegemann J, Schwager C, Zimmermann J, Erfle H, Caskey CT, Ansorge W: Automated DNA sequencing of the human HPRT locus. Genomics. 1990 Apr;6(4):593-608.

Pubmed: 2341149

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Pubmed: 14702039

Highlighted elements will appear in red.

Highlight Compounds

	6-Thioguanosine monophosphate
	Magnesium
	Phosphoribosyl pyrophosphate
	Pyrophosphate
	Thioguanine

Highlight Proteins

Hypoxanthine-guanine phosphoribosyltransferase

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