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H9908 Sigma

Monoclonal Anti-phospho-Histone H3 (pSer28) antibody produced in rat

~0.5 mg/mL, clone HTA28, purified immunoglobulin, buffered aqueous solution

Synonym: Monoclonal Anti-H3S28p



Related Categories Alphabetical Index, Antibodies, Antibodies for Cell Biology, Antibodies for Cell Cycle, Antibodies for Epigenetics,
species reactivity   human, bovine, hamster, mouse
application(s)   flow cytometry: suitable
  immunocytochemistry: suitable using 3.7% formaldehyde-methanol fixation
  microarray: suitable
  western blot: 0.5-1 μg/mL using whole extract of cultured human acute T cell leukemia Jurkat cells treated with Nocodazole.
clone   HTA28, monoclonal
concentration   ~0.5 mg/mL
antibody form   purified immunoglobulin
form   buffered aqueous solution
isotype   IgG2a
mol wt   antigen mol wt 15 kDa
shipped in   dry ice
storage temp.   −20°C
Gene Information   human ... H3F3A(3020), H3F3B(3021), HIST1H3A(8350), HIST1H3B(8358), HIST1H3C(8352), HIST1H3D(8351), HIST1H3E(8353), HIST1H3F(8968), HIST1H3G(8355), HIST1H3H(8357), HIST1H3I(8354), HIST1H3J(8356), HIST2H3A(333932), HIST2H3C(126961), HIST3H3(8290)
mouse ... H3f3a(15078), H3f3b(15081), Hist1h3a(360198), Hist1h3b(319150), Hist1h3c(319148), Hist1h3d(319149), Hist1h3e(319151), Hist1h3f(260423), Hist1h3g(97908), Hist1h3h(319152), Hist1h3i(319153), Hist2h3b(319154), Hist2h3c1(15077), Hist2h3c2(97114)
biological source   rat
conjugate   unconjugated



synthetic peptide corresponding to amino acids 23-35 (pSer28) of human histone H3.

General description

Histone H1 and the N-terminal tail of histone-3 (H3) have key roles in the folding and inter-association of the chromatin fibers. Two currently known phosphorylation sites are present in the N-terminus of H3; serine-10 and serine-28. Mitogenic stimulation, oncogenic transformation, or induction of oncogenic ras expression are accompanied with increase in serine-10 phosphorylation of the H3 N-terminal domain. It has been shown that phosphorylated H3 is associated with c-fos and c-myc genes in stimulated cells. Phosphorylation of H3, at both serine-10 and -28, coincides with the induction of mitotic chromosome condensation.
H3 phosphorylation may contribute to proto-oncogene induction by modulating chromatin structure and releasing blocks in elongation. In contrast to H1 hyperphosphorylation, site-specific phosphorylation of core histone H3 at serine-10 and -28 appears to occur exclusively during mitosis in mammalian cells. H3 dephosphorylation occurs quite rapidly after mitosis and serine-10/28 remain unphosphorylated throughout the remainder of interphase. PP1 has been identified as the H3 phosphatase.

Physical form

Solution in 0.01 M phosphate buffered saline, pH 7.4, containing 1% BSA and 15 mM sodium azide.


Monoclonal Anti-Phospho-Histone H3 (pSer28) reacts specifically with histone H3 phosphorylated at Ser28 near its N-terminus, and does not detect the unphosphorylated epitope. It detects the phosphorylated histone molecule at the onset of mitosis (prophase, metaphase and weaker at the beginning of anaphase), but not during late anaphase. Reactivity has been observed with human, bovine, hamster and mouse.

The antibody does not detect the unphosphorylated epitope. It detects the histone molecule at the onset of mitosis (prophase, metaphase, weaker at the beginning of anaphase, but not during late anaphase).

Preparation Note

Purified from culture supernatant of hybridoma cells grown in a bioreactor


Monoclonal Anti-phospho-Histone H3 (pSer28) antibody is suitable for immunoblotting (approx. 15 kDa), immunocytochemistry (3.7% formaldehyde-methanol fixation) and flow cytometry applications.

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