• USA Home
  • A2103 - Anti-Actin, N-terminal antibody produced in rabbit

A2103 Sigma-Aldrich

Anti-Actin, N-terminal antibody produced in rabbit

~0.5 mg/mL, affinity isolated antibody, buffered aqueous solution



Related Categories AC-AC, Actin Antibodies, Alphabetical Index, Antibodies, Antibodies for Cell Biology,
conjugate   unconjugated
clone   polyclonal
biological source   rabbit
application(s)   immunocytochemistry: 1-2 μg/mL using cultured chicken fibroblasts
  immunohistochemistry (formalin-fixed, paraffin-embedded sections): 2-4 μg/mL using sections of human appendix, mouse heart, and frog skeletal muscle
  indirect immunofluorescence: suitable
  western blot: 0.5-1 μg/mL using whole extract of the human epitheloid carcinoma HeLa cell line.
  western blot: 2-4 ng/mL using whole extract of rat skeletal muscle
species reactivity   mouse, frog, rat, human, chicken
mol wt   antigen 42 kDa
form   buffered aqueous solution
shipped in   wet ice
storage temp.   −20°C
packaging   antibody small pack of 25 μL
antibody form   affinity isolated antibody
Quality Level   200
antibody product type   primary antibodies
concentration   ~0.5 mg/mL
UniProt accession no.   P63261
Gene Information   human ... ACTA1(58), ACTA2(59), ACTB(60), ACTC1(70), ACTG1(71), ACTG2(72)
mouse ... Acta1(11459), Acta2(11475), Actb(11461), Actc1(11464), Actg1(11465), Actg2(11468)
rat ... Acta1(29437), Acta2(81633), Actb(81822), Actc1(29275), Actg1(287876), Actg2(25365)


General description

Actin is a cytoskeletal protein that regulates cell motility, secretion, phagocytosis and cytokinesis. The NH2-terminal of actin may function as an antigen. This terminal may also modulate actin interactions and may associate with proteins such as myosin.

Actin is one of the most conserved eukaryotic proteins, which is expressed in mammals and birds as at least six major different isoforms. Four of them represent the differentiation markers of muscle tissues and two are found practically in all non-muscle cells. Actin isoforms show >90% overall sequence homology, but only 50-60% homology in their 18 N-terminal residues. Actin is present in cells both as a globular monomer (G-actin) and as a polymer in filamentous actin (F-actin) that participates in the formation of a variety of stable and labile structures. The presence of actin in cell nuclei and cell membranes has been reported.


synthetic actin N-terminal nonapeptide conjugated to KLH.


Anti-Actin, N-terminal antibody produced in rabbit has been used in
• immunoblotting
• quantitative chromatin immunoprecipitation (qChIP)

Protein lysates generated from embryonic mouse limb tissue was analyzed by western blot using actin as the loading control. Actin was detected using rabbit anti-actin at 1:8000. Actin detected by a rabbit anti-actin antibody was used as a loading control for MCF7 cell lysates . Actin was detected at 42 kDa.

Physical form

Solution in 0.01 M phosphate buffered saline, pH 7.4, containing 1% BSA and 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

Actin and myosin are constituents of many cell types and are involved in a myriad of cellular processes including maintenance of cell shape, locomotion, secretion, cytoplasmic streaming, phagocytosis, and cytokinesis. The N-terminal domain of actin appears to be a major antigenic region of the molecule. Different isoforms can coexist in the same cell but are differentially regulated, and in most cases cannot substitute for each other functionally.

Other Notes

To view an Actin antibody selection guide, please visit www.sigmaaldrich.com/actin.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Protocols & Articles


Antibodies to Actin Gene Family Isoforms

The Actin Gene Family Actin and myosin are the two major cytoskeletal proteins implicated in cell motility. As constituents of many cell types, actin and myosin are involved in a myriad of cellular p...
Keywords: Western blot

Antibodies to Actin and GAPDH

Actin and myosin are the two major cytoskeletal proteins implicated in cell motility. As constituents of many cell types, actin and myosin are involved in a myriad of cellular process including locom...
Leigh Gaskill
BioFiles 2008, 3.6, 10.
Keywords: Biofiles, Immunofluorescence, PAGE, Western blot

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, Detection methods, Detergents, Dialysis, Electroblotting, Electrophoresis, Enzyme activity, Gel electrophoresis, Immunoprecipitation, PAGE, Protein extraction, Purification, Sample preparations, Western blot

Related Content

Antibody Explorer | Buy Primary Antibodies & Secondary Antibodies

Primary, Secondary and Recombinant Monoclonal Antibodies Providing highly cited primary and secondary antibodies, we have you covered for your ELISA, western blot, immunohistochemistry or other assay...
Keywords: Alzheimer Disease, Cancer, Chromatin immunoprecipitation, Diagnostic, Enzyme-linked immunosorbent assay, Flow cytometry, Immunocytochemistry, Immunofluorescence, Immunohistochemistry, Neuroscience, Western blot

Peer-Reviewed Papers


Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?