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  • E4781 - Anti-eRF3a/GSPT1 antibody produced in rabbit

E4781 Sigma-Aldrich

Anti-eRF3a/GSPT1 antibody produced in rabbit

~1 mg/mL, affinity isolated antibody, buffered aqueous solution

Synonym: Anti-Eukaryotic Release Factor 3a, Anti-G1 to S phase transition 1, Anti-GST1, homolog of yeast



Related Categories Alphabetical Index, Antibodies, Antibodies for Epigenetics and Nuclear Signaling, Antibodies for Gene Regulation, Antibodies for RNA Regulation and Translation,
conjugate   unconjugated
clone   polyclonal
biological source   rabbit
application(s)   immunoprecipitation (IP): 1-2 μg using HeLa cell lysates
  indirect immunofluorescence: 5-10 μg/mL using paraformadehyde-fixed HeLa cells
  western blot: 0.5-1 μg/mL using HeLa cell lysates
species reactivity   human
mol wt   antigen 76.5 kDa
form   buffered aqueous solution
shipped in   dry ice
storage temp.   −20°C
antibody form   affinity isolated antibody
antibody product type   primary antibodies
concentration   ~1 mg/mL
UniProt accession no.   P15170
Gene Information   human ... GSPT1(2935)
mouse ... Gspt1(14852)
rat ... Gspt1(24420)



synthetic peptide corresponding to amino acids 190-204 of human eRF3a/GSPT1, conjugated to KLH via a C-terminal added cysteine residue. The sequence is conserved in human, rat, and mouse.


Anti-eRF3a/GSPT1 antibody produced in rabbit has been used in immunoprecipitation, indirect immunofluorescence and western blotting.

Physical form

Solution in 0.01 M phosphate buffered saline, pH 7.4, containing 15 mM sodium azide.


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.

Biochem/physiol Actions

Eukaryotic release factor 3a (eRF3a) is a translation termination protein that is encoded by G1 to S phase transition 1 gene (GSPT1) in humans. The eRF3a/GSPT1 exon 1 contains a tri-nucleotide GGC repeat coding for a polyglycine expansion in the N-terminal of the protein. It is associated with protein translation as a regulator of apoptosis signal-regulating kinase 1 (ASK1). GSPT1 interacts with ASK1 and enhances ASK1-induced apoptotic activity by activating caspase-3. It plays a novel role in the regulation of ASK1-mediated apoptosis. GSPT1 is found to be up-regulated in various human cancers and is considered as a potential proto-oncogene.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Protocols & Articles


Antibody Basics

Immunoglobulins (Igs) are produced by B lymphocytes and secreted into plasma. The Ig molecule in monomeric form is a glycoprotein with a molecular weight of approximately 150 kDa that is shaped more ...
Keywords: Affinity chromatography, Centrifugation, Chromatography, Digestions, Direct immunofluorescence, Gene expression, High performance liquid chromatography, Immunofluorescence, Ion Exchange, Microscopy, Precipitation, Purification, Rheumatology, Scanning electron microscopy


Western Blot Protocol | Immunoblotting Protocol

Western Blotting refers to the electrophoretic transfer of proteins from sodium dodecyl sulfate polyacrylamide gels to sheets of PVDF or nitrocellullose membrane, followed by immunodetection of prote...
Keywords: AGE, Buffers, Cell disruption, Detergents, Dialysis, Electroblotting, Electrophoresis, Enzyme activity, Gel electrophoresis, Immunoprecipitation, PAGE, Protein extraction, Purification, Sample preparations, Western blot

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Peer-Reviewed Papers


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E4656 Anti-eRF3a/GSPT1 (N-terminal) antibody produced in rabbit, IgG fraction of antiserum, buffered aqueous solution
E8156 Anti-eRF1 antibody produced in rabbit, ~1 mg/mL, affinity isolated antibody, buffered aqueous solution

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