Rabbit Polyclonal Phospho-Per2 (S662) antibody (STJ90924)


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

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Rabbit Polyclonal Phospho-Per2 (S662) antibody (STJ90924)

Supplier: St John’s Laboratory Ltd.

Recommended applications: WB, IHC, ELISA

Recommended dilution: WB 1:500-1:2000; IHC 1:100-1:300; ELISA 1:5000;

Recommended protocols: check protocols

Image descriptions:

Click or hover above images to see image description for Per2 (phospho Ser662) Polyclonal Antibody.

Alternative names:

Check alternative names for the antibody


PER2 antibody, KIAA0347 antibody,|Circadian clock protein PERIOD 2 antibody|FASPS antibody|FASPS1 antibody|hPER 2 antibody|hPER2 antibody|KIAA0347 antibody|OTTHUMP00000164476 antibody|PER 2 antibody|PER2 antibody|PER2_HUMAN antibody|Period 2 antibody|Period 2 isoform 1 antibody|Period circadian clock 2 antibody|Period circadian protein 2 antibody|Period circadian protein homolog 2 antibody|Period homolog 2 (Drosophila) antibody|Period homolog 2 antibody|Period, Drosophila, homolog of, 2 antibody|Period2 antibody|Anti-PER2 antibody [EPR11381(2)] (ab179813)
SCBT cat No: sc-101105|sc-377290|sc-12429|sc-7729|



Per2 (phospho Ser662) Polyclonal Antibody

Catalogue No.



Human, Mouse


Phospho-Per2 (S662) Polyclonal Antibody detects endogenous levels of Per2 protein only when phosphorylated at S662.


Synthesized phospho-peptide derived from Per2 (phospho Ser662) at AA range 610-690





Recommended dilution

WB 1:500-1:2000; IHC 1:100-1:300; ELISA 1:5000;







Molecular weight

120 kDa


Per2 (phospho Ser662) Antibody was tube-contained. Liquid in PBS containing 50% glycerol, 0.5% BSA and 0.02% sodium azide.


1 mg/ml


Per2 (phospho Ser662) Antibody was affinity-purified from rabbit antiserum by affinity-chromatography using epitope-specific immunogen.


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

Alternative antibody names

Period circadian protein homolog 2 antibody, hPER2 antibody, Circadian clock protein PERIOD 2 antibody

Database links

Human UniProt/Swiss-Prot:O15055;Mouse UniPort/Swiss-Prot: O54943;Rat UniProt/Swiss-Port: Q9Z301;Human Entrez Gene: 8864;Mouse Entrez Gene: 18627;Rat Entrez Gene: Rn.25935

Protein names

Period circadian protein homolog 2 , hPER2 , Circadian clock protein PERIOD 2

Protein function

Transcriptional repressor 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 syndrome 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. PER1 and PER2 proteins transport CRY1 and CRY2 into the nucleus with appropriate circadian timing, but also contribute directly to repression of clock-controlled target genes through interaction with several classes of RNA-binding proteins, helicases and others transcriptional repressors. PER appears to regulate circadian control of transcription by at least three different modes. First, interacts directly with the CLOCK-ARTNL/BMAL1 at the tail end of the nascent transcript peak to recruit complexes containing the SIN3-HDAC that remodel chromatin to repress transcription. Second, brings H3K9 methyltransferases such as SUV39H1 and SUV39H2 to the E-box elements of the circadian target genes, like PER2 itself or PER1. The recruitment of each repressive modifier to the DNA seems to be very precisely temporally orchestrated by the large PER complex, the deacetylases acting before than the methyltransferases. Additionally, large PER complexes are also recruited to the target genes 3′ termination site through interactions with RNA-binding proteins and helicases that may play a role in transcription termination to regulate transcription independently of CLOCK-ARTNL/BMAL1 interactions. Recruitment of large PER complexes to the elongating polymerase at PER and CRY termination sites inhibited SETX action, impeding RNA polymerase II release and thereby repressing transcriptional reinitiation. May propagate clock information to metabolic pathways via the interaction with nuclear receptors. Coactivator of PPARA and corepressor of NR1D1, binds rhythmically at the promoter of nuclear receptors target genes like ARNTL or G6PC. Directly and specifically represses PPARG proadipogenic activity by blocking PPARG recruitment to target promoters and thereby inhibiting transcriptional activation. Required for fatty acid and lipid metabolism, is involved as well in the regulation of circulating insulin levels. Plays an important role in the maintenance of cardiovascular functions through the regulation of NO and vasodilatatory prostaglandins production in aortas. Controls circadian glutamate uptake in synaptic vesicles through the regulation of VGLUT1 expression. May also be involved in the regulation of inflammatory processes. Represses the CLOCK-ARNTL/BMAL1 induced transcription of BHLHE40/DEC1 and ATF4. Negatively regulates the formation of the TIMELESS-CRY1 complex by competing with TIMELESS for binding to CRY1.

Protein tissue specificity

Widely expressed. Found in heart, brain, placenta, lung, liver, skeleatal muscle, kidney and pancreas. High levels in skeletal muscle and pancreas. Low levels in lung. Isoform 2 is expressed in keratinocytes (at protein level).

Involvement in disease

Advanced sleep phase syndrome, familial, 1 (FASPS1) [MIM:604348]: A disorder characterized by very early sleep onset and offset. Individuals are ‘morning larks’ with a 4 hours advance of the sleep, temperature and melatonin rhythms. . Note: The disease is caused by mutations affecting the gene represented in this entry.

Protein sequence and domain

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

Protein post-translational modifications

Acetylated. Deacetylated by SIRT1, resulting in decreased protein stability. / Phosphorylated by CSNK1E and CSNK1D. Phosphorylation results in PER2 protein degradation. May be dephosphorylated by PP1. / Ubiquitinated, leading to its proteasomal degradation. Ubiquitination may be inhibited by CRY1.

Protein cellular localization

Nucleus / Cytoplasm / Cytoplasm > perinuclear region / Nucleus > nucleolus

Research area

All research areas>Transcription Regulators>Per
(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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