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Clasto-Lactacystin β-lactone

Proteasome inhibitor CAS# 154226-60-5

Clasto-Lactacystin β-lactone

2D Structure

Catalog No. BCC1224----Order now to get a substantial discount!

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Clasto-Lactacystin β-lactone

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Chemical Properties of Clasto-Lactacystin β-lactone

Cas No. 154226-60-5 SDF Download SDF
PubChem ID 9794358 Appearance Powder
Formula C10H15NO4 M.Wt 213.23
Type of Compound N/A Storage Desiccate at -20°C
Solubility Soluble to 197.79 mM in DMSO
Chemical Name (1R,4R,5S)-1-[(1S)-1-hydroxy-2-methylpropyl]-4-methyl-6-oxa-2-azabicyclo[3.2.0]heptane-3,7-dione
SMILES CC1C2C(C(=O)O2)(NC1=O)C(C(C)C)O
Standard InChIKey FWPWHHUJACGNMZ-NBBQQVJHSA-N
Standard InChI InChI=1S/C10H15NO4/c1-4(2)6(12)10-7(15-9(10)14)5(3)8(13)11-10/h4-7,12H,1-3H3,(H,11,13)/t5-,6+,7+,10-/m1/s1
General tips For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months.
We recommend that you prepare and use the solution on the same day. However, if the test schedule requires, the stock solutions can be prepared in advance, and the stock solution must be sealed and stored below -20℃. In general, the stock solution can be kept for several months.
Before use, we recommend that you leave the vial at room temperature for at least an hour before opening it.
About Packaging 1. The packaging of the product may be reversed during transportation, cause the high purity compounds to adhere to the neck or cap of the vial.Take the vail out of its packaging and shake gently until the compounds fall to the bottom of the vial.
2. For liquid products, please centrifuge at 500xg to gather the liquid to the bottom of the vial.
3. Try to avoid loss or contamination during the experiment.
Shipping Condition Packaging according to customer requirements(5mg, 10mg, 20mg and more). Ship via FedEx, DHL, UPS, EMS or other couriers with RT, or blue ice upon request.

Clasto-Lactacystin β-lactone Dilution Calculator

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Clasto-Lactacystin β-lactone Molarity Calculator

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Preparing Stock Solutions of Clasto-Lactacystin β-lactone

1 mg 5 mg 10 mg 20 mg 25 mg
1 mM 4.6898 mL 23.4489 mL 46.8977 mL 93.7954 mL 117.2443 mL
5 mM 0.938 mL 4.6898 mL 9.3795 mL 18.7591 mL 23.4489 mL
10 mM 0.469 mL 2.3449 mL 4.6898 mL 9.3795 mL 11.7244 mL
50 mM 0.0938 mL 0.469 mL 0.938 mL 1.8759 mL 2.3449 mL
100 mM 0.0469 mL 0.2345 mL 0.469 mL 0.938 mL 1.1724 mL
* Note: If you are in the process of experiment, it's necessary to make the dilution ratios of the samples. The dilution data above is only for reference. Normally, it's can get a better solubility within lower of Concentrations.

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Background on Clasto-Lactacystin β-lactone

Cell-permeable. A highly specific, potent and irreversible proteasome inhibitor. Lactacystin acts as a precursor for clasto-lactacystin β-lactone and the latter compound is at least 10 times more active than the parent Lactacystin

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References on Clasto-Lactacystin β-lactone

Enantioselective total syntheses of (-)-clasto-lactacystin beta-lactone and 7-epi-(-)-clasto-lactacystin beta-lactone.[Pubmed:16391758]

Org Biomol Chem. 2006 Jan 21;4(2):193-5.

An alkylidene carbene 1,5-CH insertion has been used as a key step in an efficient enantioselective total synthesis of (-)-clasto-lactacystin beta-lactone, and its C7-epimer. An additional noteworthy feature of the synthesis is the use of a novel oxidative deprotection procedure, utilizing DMDO, for the conversion of a late-stage benzylidene acetal into a primary alcohol and a secondary benzoate ester.

Prediction of the mechanism of action of omuralide (clasto-lactacystin beta-lactone) on human cathepsin A based on a structural model of the yeast proteasome beta5/PRE2-subunit/omuralide complex.[Pubmed:16870514]

Biochim Biophys Acta. 2006 Aug;1764(8):1372-80.

Cathepsin A (CathA) is a lysosomal serine carboxypeptidase that exhibits homology and structural similarity to the yeast and wheat serine carboxypeptidases (CPY and CPW) belonging to the alpha/beta-hydrolase fold family. Human CathA (hCathA) and CPW have been demonstrated to be inhibited by a proteasome (threonine protease) inhibitor, lactacystin, and its active derivative, omuralide (clasto-lactacystin beta-lactone), as well as chymostatin. A hCathA/omuralide complex model constructed on the basis of the X-ray crystal structures of the CPW/chymostatin complex and the yeast proteasome beta-subunit (beta5/PRE2)/omuralide one predicted that the conformation of omuralide in the active-site cleft of proteasome beta5/PRE2 should be very similar to that of chymostatin at the S1 catalytic subsites in the hCathA- and CPW-complexes. The relative positions of the glycine residues, i.e., Gly57 in hCathA, Gly53 in CPW, and Gly47 in beta5/PRE2, present in the oxyanion hole of each enzyme were also highly conserved. These results suggest that omuralide might inhibit hCathA and CPW at the S1 subsite in their active-site clefts through direct binding to the active serine residue.

Effect of proteasome inhibitor clasto-lactacystin-beta-lactone on the proteome of the haloarchaeon Haloferax volcanii.[Pubmed:17600071]

Microbiology. 2007 Jul;153(Pt 7):2271-80.

Proteasomes play key roles in a variety of eukaryotic cell functions, including translation, transcription, metabolism, DNA repair and cell-cycle control. The biological functions of these multicatalytic proteases in archaea, however, are poorly understood. In this study, Haloferax volcanii was used as a model to determine the influence the proteasome-specific inhibitor clasto-lactacystin-beta-lactone (cLbetaL) has on archaeal proteome composition. Addition of 20-30 microM cLbetaL had a widespread effect on the proteome, with a 38-42 % increase in the number of 2-D gel electrophoresis (2-DE) protein spots, from an average of 627 to 1036 spots. Protein identities for 17 of the spots that were easily separated by 2-DE and unique and/or increased 2- to 14-fold in the cLbetaL-treated cells were determined by tandem mass spectrometry (MS/MS). These included protein homologues of the DJ-1/ThiJ family, mobilization of sulfur system, translation elongation factor EF-1 A, ribosomal proteins, tubulin-like FtsZ, divalent metal ABC transporter, dihydroxyacetone kinase DhaL, aldehyde dehydrogenase and 2-oxoacid decarboxylase E1beta. Based on these results, inhibition of H. volcanii proteasomes had a global influence on proteome composition, including proteins involved in central functions of the cell.

Utility of the ammonia-free Birch reduction of electron-deficient pyrroles: total synthesis of the 20s proteasome inhibitor, clasto-lactacystin beta-lactone.[Pubmed:15864801]

Chemistry. 2005 Jul 4;11(14):4227-38.

A new synthesis of the 20S proteasome inhibitor clasto-lactacystin beta-lactone is described. Our route to this important natural product involves the partial reduction of an electron deficient pyrrole as a key step. By judicious choice of enolate counterion, we were able to exert complete control over the stereoselectivity of the reduction/aldol reaction. Early attempts to complete the synthesis by using a C-4 methyl substituted pyrrole are described in full, together with our attempts to promote regioselective elimination of a tertiary alcohol. The lessons learnt from this first approach led us to develop another, and ultimately successful, route that introduced the C-4 methyl group at a late stage in the synthesis. Our successful route is then described and this contains several highly stereoselective steps including a cis-dihydroxylation and an enolate methylation. The final synthesis proceeds in just 13 steps and in 15 % overall yield making it an extremely efficient route to this valuable compound.

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