Application

Longdaysin may be used to study cell signaling that regulate the circadian clock and behavior.

Biochem/physiol Actions

Longdaysin inhibits CK1, ERK2, and CDK7 kinases in low mM concentrations. The activity of longdaysin results in a lengthening of circadian periods in cell based and in vivo systems. Transgenic zebrafish harboring a per3-luc reporter gene displayed a 10 hour lengthening of circadian period when treated with longdaysin. Longdaysin reduces the phosphorylation of PER1 the regulator of molecular clock function and manipulates the circadian clock.