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Calyculin A
Activators & Inhibitors
Chemical Modulators

Calyculin A #9902

Citations (0)
Western blot analysis of extracts from Jurkat cells, untreated or treated with Calyculin (0.1 µM for 45 minutes prior to lysis), using P-Thr-Polyclonal #9381. Proteins were separated by 2D electrophoresis prior to blotting.
Western blot analysis of extracts from A431 cells treated with varied concentrations of Okadaic Acid or Calyculin A (30 minutes) using P-Thr-Polyclonal #9381.

Product Usage Information

Calyculin A is supplied as a lyophilized clear film. For 10 µM stock, reconstitute in 1 ml DMSO. Store in aliquots at -20ºC in the dark. Treat cells with 50-100 nM calyculin A for 5-30 minutes. Store in aliquots tightly sealed (unopened) at -20ºC in the dark. See MSDS.

This compound is sold only for use in extremely dilute solutions for biological research. No other use is intended and any other use involves substantial hazards. This compound should never be handled in powder or aerosol form or in any other form susceptible to uncontrolled release in the laboratory, even in very small quantities.


Store lyophilized at -20ºC, desiccated. In lyophilized form, the chemical is stable for 24 months. Once in solution, continue to store at -20ºC and use within 1 month to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles.

Product Description

Calyculin A is a more potent phosphatase inhibitor than Okadaic acid (2). As shown by Western blot, treatment of cells with 100 nM Calyculin A for 30 minutes induces threonine phosphorylation, detected by Phospho-Threonine-Polyclonal Antibody #9381. IC50 values for inhibitory activity against PP1 are approximately 2 nM. IC50 values for inhibitory activity against PP2A are approximately 0.5 -1.0 nM.
Molecular Weight 1009.17 g/mol
Purity >98%
Molecular Formula C50H81N4O15P
CAS 101932-71-2
Solubility Soluble in DMSO at 50mM and EtOH at 1mg/ml.


Calyculin A inhibits the activity of protein phosphatases PP1 and PP2A (1,2). Unlike Okadaic acid, which reduces PP2A activity but has little effect on PP1 activity, Calyculin A inhibits both phosphatases (1). Neither Calyculin A nor Okadaic acid inhibit acid or alkaline phosphatases or phospho- tyrosine protein phosphatases (2).

Limited Uses

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For Research Use Only. Not for Use in Diagnostic Procedures.
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To Purchase # 9902
Cat. # Size Qty. Price
10 µg