K1385 Sigma


≥98% (HPLC)

Synonym: N-[2-[N-(4-Chlorocinnamyl)-N-methylaminomethyl]phenyl]-N-(2-hydroxyethyl)-4-methoxybenzenesulfonamide phosphate salt, N-[2-[[[3-(4′-Chlorophenyl)-2-propenyl]methylamino]methyl]phenyl]-N-(2-hydroxyethyl)-4′-methoxybenzenesulfonamide phosphate salt



Frequently Asked Questions

Frequently Asked Questions are available for this Product.



Biochem/physiol Actions

KN-93 is a selective Ca2+/calmodulin-dependent protein kinase II inhibitor, which has been implicated in the regulation of smooth muscle contractility. CaM kinase II activation was inhibited by KN-93 pretreatment (IC50 ~1 μM). KN-93 inhibited histamine-induced tonic force maintenance, whereas early force development and MLC20 phosphorylation responses during the entire time course were unaffected. Both force development and maintenance in response to KCl were inhibited by KN-93. Rapid increases in KCl-induced MLC20 phosphorylation were also inhibited by KN-93, whereas steady-state MLC20 phosphorylation responses were unaffected. In contrast, phorbol 12,13-dibutyrate (PDBu) did not activate CaM kinase II and PDBu-stimulated force development was unaffected by KN-93. Thus KN-93 appears to target a step(s) essential for force maintenance in response to physiological stimuli, suggesting a role for CaM kinase II in regulating tonic contractile responses in arterial smooth muscle. Pharmacological activation of protein kinase C bypasses the KN-93 sensitive step.

Features and Benefits

This compound is featured on the Ca/CaMKs page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.

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Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis. These documents are located on the product detail page under Useful Links & Tools. Click on the following link to search for a Certificate of Analysis. Please click the following link to see the details on our Product Dating Information.
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My question is not addressed here, how can I contact Technical Service for assistance?
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Is Product No. K1385, KN-93, a salt?
Yes.  It is the phosphate salt.  
What is Product No. K1385, KN-93, soluble in?
Product K1385 is a water soluble form of KN-93, soluble in water at least at 5 mg/ml. It is also soluble in dimethyl sulfoxide (DMSO) to at least 1 mg/ml.  Solutions and solid should be protected from light.
How to store solutions of Product No. K1385, KN-93?
Sigma has not performed solution stability studies. However, stock solutions may be stable for 1-3 months, if aliquotted and stored frozen at -20 deg. C.
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