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Circadian Locomotor Output Cycles Kaput (CLOCK) is a bHLH/PAS protein that plays an important role in the molecular clock mechanism. Specifically, CLOCK activates the central circadian loop by stimulating expression of Period and Timeless proteins. CLOCK has also been shown to interact strongly with other bHLH-PAS proteins such as MOP3, a BMAL1 isoform.
CLOCK levels peak during the late night and the early part of the subjective day. Mutations in CLOCK causes defective transcriptional activity and lengthens the circadian period, leading to abnormal circadian behavior.
CLOCK antibodies are useful tools for research on circadian rythmns, sleep biology and hormonal cycles.
