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  • B7911 - Monoclonal Anti-Phosphoserine−Biotin antibody produced in mouse

B7911 Sigma

Monoclonal Anti-Phosphoserine−Biotin antibody produced in mouse

clone PSR-45, purified immunoglobulin, buffered aqueous solution

Synonym: Monoclonal Anti-Phosphoserine, Phospho Ser, Phospho serine, Phospho−Ser, Phospho−serine



Related Categories Alphabetical Index, Antibodies, Antibodies for Cell Biology, Antibodies for Kinase/Phosphatase Biology, Antibodies to Phosphoproteins,
biological source   mouse
antibody form   purified immunoglobulin
clone   PSR-45, monoclonal
form   buffered aqueous solution
application(s)   direct ELISA: 1:50,000-1:100,000 using phosphoserine-BSA at 10 μg/ml, and ExtrAvidin-HRP at 2 μg/ml
  dot blot: 1:200,000 using 40 ng phosphoserine-BSA/dot and ExtrAvidin-HRP at 1 μg/ml
isotype   IgG1
conjugate   biotin conjugate
shipped in   dry ice
storage temp.   −20°C



phosphoserine conjugated to Keyhole Limpet Hemocyanin (KLH).


By ELISA and dot blot, the antibody reacts specifically with phosphorylated serine, both as free amino acid or conjugated to carriers such as BSA or KLH. No cross-reactivity is observed with non-phosphorylated serine, phosphothreonine, phosphotyrosine, AMP or ATP. This antibody has been used in immunoblotting for the localization of some phosphoserine-containing proteins. Certain proteins known to contain phosphorylated serine may not be recognized by this antibody due to steric hindrance of the recognition site.

Physical form

Solution in phosphate buffered saline containing 1% bovine serum albumin and 15 mM sodium azide.


Monoclonal Anti-Phosphoserine−Biotin antibody may be used in indirect ELISA at a recommended dilution of 1:50,000 - 1:100,000. The antibody may be used for detection by dot blot at a working dilution of 1:200,000.

General description

Reversible phosphorylation of proteins is an important post-translational modification that plays a regulatory role in the expression of most proteins in the cells. Reversible phosphorylation at multiple serine, tyrosine and threonine residues mediate numerous signalling pathways in both prokaryotic and Eukaryotic cells. Cellular proteins with phosphorylated serine increase many fold by the activation of serine kinases. Most mitogenic receptor systems such as EGF, PDGF, insulin receptors contain serine/threonine/tyrosine kinase domains that undergo autophosphorylation when receptors bind to the respective ligands. T cell antigen receptor complex or the receptors for some hemopoietic growth factors may stimulate these phosphorylation associated kinases, and cells transformed by viral oncogenes contain elevated levels of phosphorylated tyr/ser/thr.
Monoclonal Anti-Phosphoserine may be used for the identification of proteins containing phosphorylated serine both as the free amino acid or when conjugated to carriers such as BSA or KLH. The purified mouse immunoglobulin from ascites fluid is conjugated to biotinamidohexanoic acid N-hydroxysuccinimide ester. This covalent coupling of biotin to the immunoglobulin allows for the binding of avidin or streptavidin bearing a variety of different labels.

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Keywords: Amplification, Buffers, Cell biology, Enzyme-linked immunosorbent assay, Immunofluorescence, Immunohistochemistry, Immunoprecipitation, Molecular biology, Phosphorylations, Purification, Western blot

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