Chymostatin 11004638001

CAS Number:	9076-44-2
MDL number:	MFCD00071059
PubChem Substance ID:	329749270

Chymostatin is a mixture of three components, A, B, and C. The component A being N-[((S)-1-carboxy-2-phenylethyl)-carbamoyl]--[2-iminohexahydro-4(S)-pyrimidyl]-L-glycyl-L-leucyl-phenylalaninal. The other two components B and C differ in that the L-leucyl residue is substituted by L-valine and L-isoleucine, respectively.
Chymostatin is a specific inhibitor of α-, β-, γ-, and δ-chymotrypsin.
Biochem/physiol Actions
Chymostatin is a strong inhibitor of many proteases, including chymotrypsin, papain, chymotrypsin-like serine proteinases, chymases, and lysosomal cysteine proteinases such as cathepsins A,B,C, B, H, and L. It weakly inhibits human leucocyte elastase. It is effective at a final concentration of 100 to 200 μg/ml (10 to 100 μM). Chymostatin is often included in protease inhibitor cocktails used with plant extracts.
Quality
Performance tested.
Formula variant
C31H41N7O6
Preparation Note
Working concentration: 6 to 60 µg/ml (10 to 100 µM)
1 U chymotrypsin is inhibited to 49% of the original activity by 1.8 µg of chymostatin.
Thin-layer chromatography: butanol/methanol/H2O = 4 / 1 / 2
Working solution: Soluble in glacial acetic acid or DMSO to 20 mg/ml. Sparingly soluble in water, methanol, or ethanol. Insoluble in ethyl acetate, petroleum and ethyl ethers, hexane, or chloroform (CHCl3).
It is recommended to dissolve the inhibitor in 1% acetic acid in higher concentration and to adjust the concentration wanted with phosphate buffer, 0.05 M, pH 7.0, which is common for chymotrypsin assay.
CAUTION: DMSO (Dimethyl sulfoxide) will permeate the skin, carrying solubilized protease inhibitors. Always wear appropriate protection for eyes, skin, etc.
Storage conditions (working solution): -15 to -25 °C
Dilute solutions should be stored frozen in aliquots at -15 to -25 °C and are stable for approximately one month. Avoid repeated freezing. Growth of microorganisms should be avoided as proteases from microbial origin may hydrolyze the peptides.
Solubility testing in glacial acetic acid at 10 mg/ml yields a clear solution, which is usually colorless, but can be yellow in appearance. It is reportedly also soluble in DMSO; only slightly soluble in water and short-chain alcohols; insoluble in ethyl acetate, butyl acetate, ether, hexane, and petroleum ether. Stock solutions (10 mM) can be prepared in DMSO and are stable for months at -20 °C. Stock solutions can also be made in 0.1 M HCl. Dilute solutions (10-100 μM) are only stable for several hours, due to oxidation of the terminal aldehyde.
For life science research only. Not for use in diagnostic procedures.

form	powder
Quality Level	100,
mol wt	Mr = 607.71
packaging	pkg of 10 mg
Торговая марка	Roche
mp	205 °C
solubility	acetic acid: soluble 20 mg/mL
shipped in	wet ice
storage temp.	2-8°C
SMILES string	OC(C(NC(NC(C1NC(NCC1)=N)C([F,Cl,Br,I]C)=O)=O)CC2=CC=CC=C2)=O
InChI key	MRXDGVXSWIXTQL-HYHFHBMOSA-N

RIDADR	NONH for all modes of transport
WGK Germany	WGK 1
Flash Point F	Not applicable
Flash Point C	Not applicable