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62070 Sigma

Leupeptin

>4000 U/mg

Synonym: Acetyl-Leu-Leu-Arg-al, Leupeptin hemisulfate salt, N-Acetyl-L-leucyl-L-leucyl-L-argininal hemisulfate salt

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Properties

Related Categories Biochemicals and Reagents, Enzyme Inhibitors, Enzyme Inhibitors by Type, Enzymes, Inhibitors, and Substrates, Organic Covalent Modifiers More...
biological source   from synthetic
InChI Key   CIPMKIHUGVGQTG-VFFZMTJFSA-N
solubility   H2O: 50 mg/mL
storage temp.   −20°C

Description

Analysis Note

Leupeptin gives multiple peaks on HPLC due to equilibria among three forms in solution. Purity determined using three main peaks. Majority of contaminating peptide is racemized leupeptin.

Other Notes

Inhibitor of trypsin, plasmin, papain and cathepsin B

Unit Definition

1 U corresponds to the amount of inhibitor which reduces the trypsin activity by 1 BAEE-U. (1 BAEE-U is the amount of enzyme which increases the absorbance at 253 nm by 0.001 per minute at pH 7.6 and 25 °C; BAEE, Cat. No. 12880, as substrate)

Biochem/physiol Actions

Inhibitor of serine and cysteine proteases. Inhibits plasmin, trypsin, papain, calpain, and cathepsin B. Does not inhibit pepsin, cathepsins A and D, thrombin, or α-chymotrypsin. Effective concentration 10-100 μM. There have been numerous studies using leupeptin to protect against hearing loss caused by acoustic overstimulation or the ototoxic antibiotic gentamicin. (Loss of cochlear hair cells is believed to be mediated by calpain.)

Price and Availability


Biomedical Applications
Safety & Documentation

Safety Information

RIDADR 
NONH for all modes of transport
WGK Germany 
3

Documents

Certificate of Analysis

Protocols & Articles
Peer-Reviewed Papers
15

References

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Description

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92210 Timestrip Plus 0 °C
06693 Timestrip Plus -20 °C

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