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E3652

Sigma-Aldrich

Epoxomicin

≥95% (HPLC), solid

Synonym(s):

N-Acetyl-N-methyl-L-isoleucyl-L-isoleucyl-N-[(1S)-3-methyl-1-[[(2R)-2-methyloxiranyl]carbonyl]butyl]-L-threoninamide

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About This Item

CAS Number:
134381-21-8
MDL number:
MFCD03791061
UNSPSC Code:
12352202
PubChem Substance ID:
329799052
NACRES:
NA.77

Assay

≥95% (HPLC)

form

solid

storage temp.

−20°C

SMILES string

CC[C@H](C)[C@H](NC(=O)[C@H]([C@@H](C)CC)N(C)C(C)=O)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CC(C)C)C(=O)[C@@]1(C)CO1

InChI

1S/C28H50N4O7/c1-11-16(5)21(30-27(38)23(17(6)12-2)32(10)19(8)34)25(36)31-22(18(7)33)26(37)29-20(13-15(3)4)24(35)28(9)14-39-28/h15-18,20-23,33H,11-14H2,1-10H3,(H,29,37)(H,30,38)(H,31,36)/t16-,17-,18+,20-,21-,22-,23-,28+/m0/s1

InChI key

DOGIDQKFVLKMLQ-JTHVHQAWSA-N

General description

Epoxomicin is a linear peptide consisting of a threonine or serine residue with α′, β′-epoxyketone derived from leucine or a γ,δ-dehydroleucine. It is a natural product isolated from Actinomyces sp., and is a cell-permeable, potent, selective and irreversible proteasome inhibitor.

Application

Epoxomicin has been used:
  • as an ubiquitin–proteosome system (UPS) inhibitor in pheochromocytoma PC12 cells
  • as a proteasome inhibitor in mammary epithelial MCF-10A cells
  • as a proteasome inhibitor in chymotryptic assay in cardiomyocytes

Biochem/physiol Actions

Epoxomicin binds covalently to the catalytic subunits of proteasome. It forms an adduct with target proteins. It inhibits chymotrypsin-like activity of the proteasome. Epoxomicin also inhibits the nuclear factor κ light chain enhancer of activated B cells (NF-κB) mediated proinflammatory signalling pathway. It is also a potent antitumor and anti-inflammatory agent.
Epoxomicin, a natural product isolated from Actinomyces sp., is a cell-permeable, potent, selective and irreversible proteasome inhibitor.

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Epoxomicin, a potent and selective proteasome inhibitor, exhibits in vivo antiinflammatory activity
Meng L, et al.
Proceedings of the National Academy of Sciences of the USA, 96(18), 10403-10408 (1999)
L Meng et al.
Proceedings of the National Academy of Sciences of the United States of America, 96(18), 10403-10408 (1999-09-01)
The proteasome regulates cellular processes as diverse as cell cycle progression and NF-kappaB activation. In this study, we show that the potent antitumor natural product epoxomicin specifically targets the proteasome. Utilizing biotinylated-epoxomicin as a molecular probe, we demonstrate that epoxomicin
Differential degradation of full-length and cleaved ataxin-7 fragments in a novel stable inducible SCA7 model
Yu X, et al.
Journal of Molecular Neuroscience, 47(2), 219-233 (2012)
Kyung Bo Kim et al.
Natural product reports, 30(5), 600-604 (2013-04-12)
The initial enthusiasm following the discovery of a pharmacologically active natural product is often fleeting due to the poor prospects for its ultimate clinical application. Despite this, the ever-changing landscape of modern biology has a constant need for molecular probes
The selective proteasome inhibitors lactacystin and epoxomicin can be used to either up-or down-regulate antigen presentation at nontoxic doses
Schwarz K, et al.
Journal of Immunology, 164(12), 6147-6157 (2000)
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