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Anti-phospho-CREB (Ser133) Antibody

Upstate®, from rabbit

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active transcription factor CREB, cAMP responsive element binding protein 1, cAMP-response element-binding protein-1, transactivator protein

biological source


Quality Level

antibody form

purified immunoglobulin

antibody product type

primary antibodies



species reactivity

mouse, rat, hamster, human




electrophoretic mobility shift assay: suitable
immunohistochemistry (formalin-fixed, paraffin-embedded sections): suitable
immunoprecipitation (IP): suitable
western blot: suitable



NCBI accession no.

UniProt accession no.

shipped in

wet ice

target post-translational modification

phosphorylation (pSer133)

Gene Information

human ... CREB1(1385)

General description

CREB is a β-ZIP transcription factor that activates target genes through cAMP response elements. CREB is able to mediate signals from numerous physiological stimuli, resulting in regulation of a broad array of cellular responses. While CREB is expressed in numerous tissues, it plays a large regulatory role in the nervous system. CREB is believed to play a key role in promoting neuronal survival, precursor proliferation, neurite outgrowth and neuronal differentiation in certain neuronal populations. CREB promotes outgrowth and differentiation as a mediator of neurotrophin pathways. CREB is able to selectively activate numerous downstream genes through interactions with different dimerization partners. CREB is activated by phosphorylation at Ser133 by various signaling pathways including Erk, Ca2+ and stress signaling.


Recognizes p43 phosphorylated CREB. May also recognize p30 and p38 kDa proteins. The p30 & p38 proteins may be phosphorylated CREM and ATF-1 respectively, since the two proteins share significant homology to the phosphorylated CREB immunizing peptide.


Epitope: phospho-Ser133
KLH-conjugated synthetic peptide corresponding to the amino acids including and encompassing phosphorylated Ser133 of CREB.


10 μL of a previous lot immunoprecipitated phosphorylated CREB from 500 μg of cells treated with 50 μM forskolin.

A 1:1000 dilution of previous lots detected phosphorylated CREB in formalin-fixed paraffin-embedded normal and ischemic rat brain sections.

Gel Shift (EMSA):
This antibody has been shown to gel shift by independent labs.
Research Category
Research Sub Category
Nuclear Receptors
Use Anti-phospho-CREB (Ser133) Antibody (rabbit polyclonal antibody) is highly published and validated in EMSA, IHC,IHC(P), IP, WB to detect phospho-CREB (Ser133) also known as active transcription factor CREB, cAMP responsive element binding protein 1.


Evaluated by western blot on lysates from mouse NIH/3T3 cells treated with 50 mM forskolin.

Western Blot Analysis: This antibody detected CREB when phosphorylated on Ser133 at 1:1,000 dilution in forskolin treated NIH/3T3 lysates via SDS-PAGE and transferred to PVDF (Immobilon-P).

Target description

Detects CREB only when phosphorylated on Ser133 (~43 kDa). May recognize ATF-1 (~38 kDa) and CREM (~30 kDa) as the two proteins share significant homology to the phosphorylated immunizing peptide.

Physical form

Format: Purified
Purified by protein A-Sepharose followed by immunoadsorbant chromatography using an unphosphorylated CREB affinity gel column.
Purified rabbit IgG in buffer containing 0.1 M Tris-Glycine (pH 7.4) 15 mM NaCl, and 0.05% sodium azide with 30% glycerol.

Storage and Stability

Stable for 1 year at -20°C from date of receipt.

Handling Recommendations:
Upon receipt, and prior to removing the cap, centrifuge the vial and gently mix the solution. Aliquot into microcentrifuge tubes and store at -20°C.
Avoid repeated freeze/thaw cycles, which may damage IgG and affect product performance.

Analysis Note

Forskolin-stimulated WI-38 nuclear extracts.

Other Notes

Concentration: Please refer to the Certificate of Analysis for the lot-specific concentration.

Legal Information

UPSTATE is a registered trademark of Merck KGaA, Darmstadt, Germany


Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

Storage Class Code

12 - Non Combustible Liquids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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M J Meaney et al.
The Journal of neuroscience : the official journal of the Society for Neuroscience, 20(10), 3926-3935 (2000-05-11)
Postnatal handling increases glucocorticoid receptor expression in the rat hippocampus, thus altering the regulation of hypothalamic synthesis of corticotropin-releasing hormone and the hypothalamic-pituitary-adrenal response to stress. The effect on glucocorticoid receptor gene expression represents one mechanism by which the early
K Ogita et al.
Neuroreport, 11(4), 859-862 (2000-04-11)
Radiolabeled probes for the transcription factor, activator protein-1 (AP-1), bound differentially to nuclear fractions of discrete structures of the guinea pig cochlea (organ of Corti, lateral wall tissues, and spiral ganglion). Noise exposure (4 kHz octave band, 115 dB, for
Brian DellaValle et al.
Malaria journal, 15(1), 427-427 (2016-08-25)
Cerebral malaria from Plasmodium falciparum infection is major cause of death in the tropics. The pathogenesis of the disease is complex and the contribution of reactive oxygen and nitrogen species (ROS/RNS) in the brain is incompletely understood. Insulinotropic glucagon-like peptide-1
Mitogen regulated induction of FRA-1 proto-oncogene is controlled by the transcription factors binding to both serum and TPA response elements.
Adiseshaiah, P; Peddakama, S; Zhang, Q; Kalvakolanu, DV; Reddy, SP
Oncogene null
G Y Wu et al.
Proceedings of the National Academy of Sciences of the United States of America, 98(5), 2808-2813 (2001-02-28)
The cAMP-responsive element binding protein (CREB), a key regulator of gene expression, is activated by phosphorylation on Ser-133. Several different protein kinases possess the capability of driving this phosphorylation, making it a point of potential convergence for multiple intracellular signaling

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