Geldanamycin

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Geldanamycin
IUPAC name

(4E,6Z,8S,9S,10E,12S,13R,14S,16R)-13-hydroxy
-8,14,19-trimethoxy-4,10,12,16-tetramethyl
-3,20,22-trioxo-2-azabicyclo[16.3.1]
docosa-1(21),4,6,10,18-pentaen-9-yl carbamate

Identifiers
CAS number 30562-34-6 YesY
ChemSpider 10272739 YesY
DrugBank DB02424
ChEMBL CHEMBL278315 YesY
Jmol-3D images {{#if:NC(=O)O[C@H]1C(/C)=C/[C@H](C)[C@@H](O)[C@@H](OC)C[C@H](C)C\C2=C(/OC)C(=O)\C=C(\NC(=O)C(\C)=C\C=C/[C@@H]1OC)C2=O|Image 1
Properties
Molecular formula C29H40N2O9
Molar mass 560.64 g/mol
Appearance Gold-yellow fine crystalline powder
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Geldanamycin is a benzoquinone ansamycin antibiotic that inhibits the function of Hsp90 (Heat Shock Protein 90) by binding to the unusual ADP/ATP-binding pocket of the protein.[2] HSP90 client proteins play important roles in the regulation of the cell cycle, cell growth, cell survival, apoptosis, angiogenesis and oncogenesis.

Hsp90-geldanamycin complex. PDB 1yet[1]
Geldanamycin induces the degradation of proteins that are mutated in tumor cells such as v-Src, Bcr-Abl and p53 preferentially over their normal cellular counterparts. This effect is mediated via HSP90. Despite its potent antitumor potential, geldanamycin presents several major drawbacks as a drug candidate such as hepatotoxicity, further, Jilani et al. reported that geldanamycin induces eryptosis (apoptosis of erythrocytes) under physiological concentrations.[3] These side effects have led to the development of geldanamycin analogues, in particular analogues containing a derivatisation at the 17 position:
  • 17-AAG
  • 17-DMAG

Biosynthesis

Geldanamycin was originally discovered in the organism Streptomyces hygroscopicus.[4] It is a macrocyclic polyketide that is synthesized by a Type I polyketide synthase. The genes gelA, gelB, and gelC encode for the polyketide synthase. The PKS is first loaded with 3-amino-5-hydroxybenzoic acid (AHBA). It then utilizes malonyl-CoA, methylmalonyl-CoA, and methoxymalonyl-CoA to synthesize the precursor molecule Progeldanamycin.[5] This precursor is subjected to several enzymatic and non-enzymatic tailoring steps to produce the active molecule Geldanamycin, which include hydroxylation, o-methylation, carbamoylation, and oxidation.[6]

Notes

  1. ↑ Stebbins, C. E.; Russo, A. A.; Schneider, C.; Rosen, N.; Hartl, F. U.; Pavletich, N. P. (1997). "Crystal structure of an Hsp90-geldanamycin complex: Targeting of a protein chaperone by an antitumor agent". Cell 89 (2): 239–250. doi:10.1016/S0092-8674(00)80203-2. PMID 9108479. 
  2. ↑ Schulte, T. W.; Akinaga, S.; Soga, S.; Sullivan, W.; Stensgard, B.; Toft, D.; Neckers, L. M. (1998). "Antibiotic radicicol binds to the N-terminal domain of Hsp90 and shares important biologic activities with geldanamycin". Cell stress & chaperones 3 (2): 100–108. doi:10.1379/1466-1268(1998)003<0100:ARBTTN>2.3.CO;2. PMC 312953. PMID 9672245. 
  3. ↑ "Geldanamycin-Induced Phosphatidylserine Translocation in the Erythrocyte Membrane". Cell Physiol Biochem 32: 1600–1609. 2013. doi:10.1159/000356596. 
  4. ↑ He, W.; Wu, L.; Gao, Q.; Du, Y.; Wang, Y. (2006). "Identification of AHBA Biosynthetic Genes Related to Geldanamycin Biosynthesis in Streptomyces hygroscopicus 17997". Current Microbiology 52 (3): 197–203. doi:10.1007/s00284-005-0203-y. PMID 16502293. 
  5. ↑ Kim, W.; Lee, D.; Hong, S. S.; Na, Z.; Shin, J. C.; Roh, S. H.; Wu, C. Z.; Choi, O.; Lee, K.; Shen, Y. M.; Paik, S. G.; Lee, J. J.; Hong, Y. S. (2009). "Rational Biosynthetic Engineering for Optimization of Geldanamycin Analogues". ChemBioChem 10 (7): 1243–1251. doi:10.1002/cbic.200800763. PMID 19308924. 
  6. ↑ Lee, D.; Lee, K.; Cai, X. F.; Dat, N. T.; Boovanahalli, S. K.; Lee, M.; Shin, J. C.; Kim, W.; Jeong, J. K.; Lee, J. S.; Lee, C. H.; Lee, J. H.; Hong, Y. S.; Lee, J. J. (2006). "Biosynthesis of the Heat-Shock Protein 90 Inhibitor Geldanamycin: New Insight into the Formation of the Benzoquinone Moiety". ChemBioChem 7 (2): 246–248. doi:10.1002/cbic.200500441. PMID 16381049. 

References

  • Bedin, M.; Gaben, A. M.; Saucier, C. C.; Mester, J. (2004). "Geldanamycin, an inhibitor of the chaperone activity of HSP90, induces MAPK-independent cell cycle arrest". International Journal of Cancer 109 (5): 643–652. doi:10.1002/ijc.20010. PMID 14999769. 

External links

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