Chemical Component Summary

Name9H-purine-6-thiol
Identifiers9H-purine-6-thiol
FormulaC5 H4 N4 S
Molecular Weight152.18
TypeNON-POLYMER
Isomeric SMILESSc1ncnc2[nH]cnc12
InChIInChI=1S/C5H4N4S/c10-5-3-4(7-1-6-3)8-2-9-5/h1-2H,(H2,6,7,8,9,10)
InChIKeyGLVAUDGFNGKCSF-UHFFFAOYSA-N

Chemical Details

Formal Charge0
Atom Count14
Chiral Atom Count0
Chiral Atomsn/a
Bond Count15
Aromatic Bond Count10
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB01033 Different stereochemistry
NameMercaptopurine
Groupsapproved
DescriptionAn antimetabolite antineoplastic agent with immunosuppressant properties. It interferes with nucleic acid synthesis by inhibiting purine metabolism and is used, usually in combination with other drugs, in the treatment of or in remission maintenance programs for leukemia. [PubChem]
Synonyms
  • 6 MP
  • 6-Mercaptopurine
  • 6-MP
  • 6-Thiohypoxanthine
  • 6-Thioxopurine
SaltsMercaptopurine monohydrate
Brand Names
  • Mercaptopurine
  • Mercaptopurine Tablets USP
  • Purinethol
  • Purixan
  • Leukerin
Affected OrganismHumans and other mammals
IndicationFor remission induction and maintenance therapy of acute lymphatic leukemia.
PharmacologyMercaptopurine is one of a large series of purine analogues which interfere with nucleic acid biosynthesis and has been found active against human leukemias. It is an analogue of the purine bases adenine and hypoxanthine. It is not known exactly which of any one or more of the biochemical effects of mercaptopurine and its metabolites are directly or predominantly responsible for cell death.
Mechanism of actionMercaptopurine competes with hypoxanthine and guanine for the enzyme hypoxanthine-guanine phosphoribosyltransferase (HGPRTase) and is itself converted to thioinosinic acid (TIMP). This intracellular nucleotide inhibits several reactions involving inosinic acid (IMP), including the conversion of IMP to xanthylic acid (XMP) and the conversion of IMP to adenylic acid (AMP) via adenylosuccinate (SAMP). In addition, 6-methylthioinosinate (MTIMP) is formed by the methylation of TIMP. Both TIMP and MTIMP have been reported to inhibit glutamine-5-phosphoribosylpyrophosphate amidotransferase, the first enzyme unique to the de novo pathway for purine ribonucleotide synthesis. Experiments indicate that radiolabeled mercaptopurine may be recovered from the DNA in the form of deoxythioguanosine. Some mercaptopurine is converted to nucleotide derivatives of 6-thioguanine (6-TG) by the sequential actions of inosinate (IMP) dehydrogenase and xanthylate (XMP) aminase, converting TIMP to thioguanylic acid (TGMP).
Route of administrationOral
Categories
  • Antimetabolites
  • Antimetabolites, Antineoplastic
  • Antineoplastic Agents
  • Antineoplastic and Immunomodulating Agents
  • Chemical Actions and Uses
ATC-CodeL01BB02
AHFS-Code10:00.00
CAS number50-44-2
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682