Mouse Monoclonal Clock antibody [8F7] (STJ97961)


Reactivity: Human
Applications: WB, IF, ELISA
Conjugation: Unconjugated
Supplier: St John’s Laboratory Ltd.

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Mouse Monoclonal Clock antibody [8F7] (STJ97961)

Supplier: St John’s Laboratory Ltd.

Recommended applications: WB, IF, ELISA

Recommended dilution: WB 1:500-1:2000; IF 1:200-1:1000; ELISA 1:10000

Recommended protocols: check protocols

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Alternative names:

Check alternative names for the antibody


CLOCK antibody, BHLHE8 antibody, KIAA0334 antibody,|bHLHe8 antibody|Circadian locomoter output cycles kaput protein antibody|Circadian locomoter output cycles protein kaput antibody|Circadian Locomotor Output Cycles Kaput antibody|Circadium Locomotor Output Cycles Kaput antibody|Class E basic helix-loop-helix protein 8 antibody|CLOCK antibody|Clock circadian regulator antibody|Clock homolog antibody|Clock protein antibody|CLOCK_HUMAN antibody|hCLOCK antibody|KIAA0334 antibody|Anti-KAT13D / CLOCK antibody – ChIP Grade (ab3517)
SCBT cat No: sc-271603|sc-25361|sc-6928|sc-6927|



Clock Monoclonal Antibody

Catalogue No.





Clock Monoclonal Antibody detects endogenous levels of Clock protein.


Purified recombinant fragment of human Clock expressed in E Coli





Recommended dilution

WB 1:500-1:2000; IF 1:200-1:1000; ELISA 1:10000








Clock Antibody was tube-contained. Ascitic fluid containing 0.03% sodium azide.


1 mg/ml


Clock Antibody was purified using affinity purification.


-20 Celsius degree. Avoid repeated freeze/thaw cycles.

Alternative antibody names

Circadian locomoter output cycles protein kaput antibody, hCLOCK antibody, Class E basic helix-loop-helix protein 8 antibody, bHLHe8 antibody

Database links

Human UniProt/Swiss-Prot:O15516;Mouse UniPort/Swiss-Prot: O08785;Rat UniProt/Swiss-Port: Q9WVS9;Human Entrez Gene: 9575;Mouse Entrez Gene: 12753;Rat Entrez Gene: Rn.205839

Protein names

Circadian locomoter output cycles protein kaput , hCLOCK , Class E basic helix-loop-helix protein 8 , bHLHe8

Protein function

Transcriptional activator which forms a core component of the circadian clock. The circadian clock, an internal time-keeping system, regulates various physiological processes through the generation of approximately 24 hour circadian rhythms in gene expression, which are translated into rhythms in metabolism and behavior. It is derived from the Latin roots ‘circa’ (about) and ‘diem’ (day) and acts as an important regulator of a wide array of physiological functions including metabolism, sleep, body temperature, blood pressure, endocrine, immune, cardiovascular, and renal function. Consists of two major components: the central clock, residing in the suprachiasmatic nucleus (SCN) of the brain, and the peripheral clocks that are present in nearly every tissue and organ system. Both the central and peripheral clocks can be reset by environmental cues, also known as Zeitgebers (German for ‘timegivers’). The predominant Zeitgeber for the central clock is light, which is sensed by retina and signals directly to the SCN. The central clock entrains the peripheral clocks through neuronal and hormonal signals, body temperature and feeding-related cues, aligning all clocks with the external light/dark cycle. Circadian rhythms allow an organism to achieve temporal homeostasis with its environment at the molecular level by regulating gene expression to create a peak of protein expression once every 24 hours to control when a particular physiological process is most active with respect to the solar day. Transcription and translation of core clock components (CLOCK, NPAS2, ARNTL/BMAL1, ARNTL2/BMAL2, PER1, PER2, PER3, CRY1 and CRY2) plays a critical role in rhythm generation, whereas delays imposed by post-translational modifications (PTMs) are important for determining the period (tau) of the rhythms (tau refers to the period of a rhythm and is the length, in time, of one complete cycle). A diurnal rhythm is synchronized with the day/night cycle, while the ultradian and infradian rhythms have a period shorter and longer than 24 hours, respectively. Disruptions in the circadian rhythms contribute to the pathology of cardiovascular diseases, cancer, metabolic syndromes and aging. A transcription/translation feedback loop (TTFL) forms the core of the molecular circadian clock mechanism. Transcription factors, CLOCK or NPAS2 and ARNTL/BMAL1 or ARNTL2/BMAL2, form the positive limb of the feedback loop, act in the form of a heterodimer and activate the transcription of core clock genes and clock-controlled genes (involved in key metabolic processes), harboring E-box elements (5′-CACGTG-3′) within their promoters. The core clock genes: PER1/2/3 and CRY1/2 which are transcriptional repressors form the negative limb of the feedback loop and interact with the CLOCK, NPAS2-ARNTL/BMAL1, ARNTL2/BMAL2 heterodimer inhibiting its activity and thereby negatively regulating their own expression. This heterodimer also activates nuclear receptors NR1D1/2 and RORA/B/G, which form a second feedback loop and which activate and repress ARNTL/BMAL1 transcription, respectively. CLOCK has an intrinsic acetyltransferase activity, which enables circadian chromatin remodeling by acetylating histones and nonhistone proteins, including its own partner ARNTL/BMAL1. Regulates the circadian expression of ICAM1, VCAM1, CCL2, THPO and MPL and also acts as an enhancer of the transactivation potential of NF-kappaB. Plays an important role in the homeostatic regulation of sleep. The CLOCK-ARNTL/BMAL1 heterodimer regulates the circadian expression of SERPINE1/PAI1, VWF, B3, CCRN4L/NOC, NAMPT, DBP, MYOD1, PPARGC1A, PPARGC1B, SIRT1, GYS2, F7, NGFR, GNRHR, BHLHE40/DEC1, ATF4, MTA1, KLF10 and also genes implicated in glucose and lipid metabolism. Represses glucocorticoid receptor NR3C1/GR-induced transcriptional activity by reducing the association of NR3C1/GR to glucocorticoid response elements (GREs) via the acetylation of multiple lysine residues located in its hinge region. Promotes rhythmic chromatin opening, regulating the DNA accessibility of other transcription factors. The CLOCK-ARNTL2/BMAL2 heterodimer activates the transcription of SERPINE1/PAI1 and BHLHE40/DEC1. / Acetyl-CoA + [histone] = CoA + acetyl-[histone]. / The redox state of the cell can modulate the transcriptional activity of the CLOCK-ARNTL/BMAL1 heterodimer; NADH and NADPH enhance the DNA-binding activity of the heterodimer.

Protein tissue specificity

Hair follicles (at protein level). Expressed in all tissues examined including spleen, thymus, prostate, testis, ovary, small intestine, colon, leukocytes, heart, brain, placenta, lung, liver, skeletal muscle, kidney and pancreas. Highest levels in testis and skeletal muscle. Low levels in thymus, lung and liver. Expressed in all brain regions with highest levels in cerebellum. Highly expressed in the suprachiasmatic nucleus (SCN).

Protein sequence and domain

Contains 1 bHLH (basic helix-loop-helix) domain. / Contains 1 PAC (PAS-associated C-terminal) domain. / Contains 2 PAS (PER-ARNT-SIM) domains.

Protein post-translational modifications

Ubiquitinated, leading to its proteasomal degradation. / O-glycosylated; contains O-GlcNAc. O-glycosylation by OGT prevents protein degradation by inhibiting ubiquitination. It also stabilizes the CLOCK-ARNTL/BMAL1 heterodimer thereby increasing CLOCK-ARNTL/BMAL1-mediated transcriptional activation of PER1/2/3 and CRY1/2. / Phosphorylation is dependent on the CLOCK-ARNTL/BMAL1 heterodimer formation. Phosphorylation enhances the transcriptional activity, alters the subcellular localization and decreases the stability of the heterodimer by promoting its degradation. Phosphorylation shows circadian variations in the liver. May be phosphorylated by CSNK1D and CKSN1E. / Sumoylation enhances its transcriptional activity and interaction with ESR1, resulting in up-regulation of ESR1 activity. Estrogen stimulates sumoylation. Desumoylation by SENP1 negatively regulates its transcriptional activity. Sumoylation stimulates cell proliferation and increases the proportion of S phase cells in breast cancer cell lines.

Protein cellular localization

Nucleus / Cytoplasm

Research area

All research areas>Transcription Regulators>Clock
(View all antibody categories related to Transcription Regulators)


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St John’s Laboratory Ltd.

Product type

Primary antibody


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