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  • Product nameAnti-KAT3B / p300 antibody
    See all KAT3B / p300 primary antibodies
  • Description
    Rabbit polyclonal to KAT3B / p300
  • SpecificityDetects endogenous levels of total p300 protein.
  • Tested applicationsELISA, IHC-P, WBmore details
  • Species reactivity
    Reacts with: Human
  • Immunogen

    Synthetic peptide derived from N-terminal of human p300.

  • Positive control
    • Extracts from MDA-MB-435 cells, human lung carcinoma tissue



Our Abpromise guarantee covers the use of ab61217 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
ELISA 1/10000.
IHC-P 1/50 - 1/100.
WB 1/500 - 1/1000. Detects a band of approximately 290 kDa (predicted molecular weight: 290 kDa).


  • FunctionFunctions as histone acetyltransferase and regulates transcription via chromatin remodeling. Acetylates all four core histones in nucleosomes. Histone acetylation gives an epigenetic tag for transcriptional activation. Mediates cAMP-gene regulation by binding specifically to phosphorylated CREB protein. Mediates acetylation of histone H3 at 'Lys-122' (H3K122ac), a modification that localizes at the surface of the histone octamer and stimulates transcription, possibly by promoting nucleosome instability. Mediates acetylation of histone H3 at 'Lys-27' (H3K27ac). Also functions as acetyltransferase for nonhistone targets. Acetylates 'Lys-131' of ALX1 and acts as its coactivator. Acetylates SIRT2 and is proposed to indirectly increase the transcriptional activity of TP53 through acetylation and subsequent attenuation of SIRT2 deacetylase function. Acetylates HDAC1 leading to its inactivation and modulation of transcription. Acts as a TFAP2A-mediated transcriptional coactivator in presence of CITED2. Plays a role as a coactivator of NEUROD1-dependent transcription of the secretin and p21 genes and controls terminal differentiation of cells in the intestinal epithelium. Promotes cardiac myocyte enlargement. Can also mediate transcriptional repression. Binds to and may be involved in the transforming capacity of the adenovirus E1A protein. In case of HIV-1 infection, it is recruited by the viral protein Tat. Regulates Tat's transactivating activity and may help inducing chromatin remodeling of proviral genes. Acetylates FOXO1 and enhances its transcriptional activity. Acetylates BCL6 wich disrupts its ability to recruit histone deacetylases and hinders its transcriptional repressor activity. Participates in CLOCK or NPAS2-regulated rhythmic gene transcription; exhibits a circadian association with CLOCK or NPAS2, correlating with increase in PER1/2 mRNA and histone H3 acetylation on the PER1/2 promoter. Acetylates MTA1 at 'Lys-626' which is essential for its transcriptional coactivator activity (PubMed:10733570, PubMed:11430825, PubMed:11701890, PubMed:12402037, PubMed:12586840, PubMed:12929931, PubMed:14645221, PubMed:15186775, PubMed:15890677, PubMed:16617102, PubMed:16762839, PubMed:18722353, PubMed:18995842, PubMed:23415232, PubMed:23911289, PubMed:23934153, PubMed:8945521). Acetylates XBP1 isoform 2; acetylation increases protein stability of XBP1 isoform 2 and enhances its transcriptional activity (PubMed:20955178). Acetylates PCNA; acetylation promotes removal of chromatin-bound PCNA and its degradation during nucleotide excision repair (NER) (PubMed:24939902). Acetylates MEF2D.
  • Involvement in diseaseDefects in EP300 may play a role in epithelial cancer.
    Chromosomal aberrations involving EP300 may be a cause of acute myeloid leukemias. Translocation t(8;22)(p11;q13) with KAT6A.
    Rubinstein-Taybi syndrome 2
  • Sequence similaritiesContains 1 bromo domain.
    Contains 1 CBP/p300-type HAT (histone acetyltransferase) domain.
    Contains 1 KIX domain.
    Contains 2 TAZ-type zinc fingers.
    Contains 1 ZZ-type zinc finger.
  • DomainThe CRD1 domain (cell cycle regulatory domain 1) mediates transcriptional repression of a subset of p300 responsive genes; it can be de-repressed by CDKN1A/p21WAF1 at least at some promoters. It conatins sumoylation and acetylation sites and the same lysine residues may be targeted for the respective modifications. It is proposed that deacetylation by SIRT1 allows sumoylation leading to suppressed activity.
  • Post-translational
    Acetylated on Lys at up to 17 positions by intermolecular autocatalysis. Deacetylated in the transcriptional repression domain (CRD1) by SIRT1, preferentially at Lys-1020. Deacetylated by SIRT2, preferentially at Lys-418, Lys-423, Lys-1542, Lys-1546, Lys-1549, Lys-1699, Lys-1704 and Lys-1707.
    Citrullinated at Arg-2142 by PADI4, which impairs methylation by CARM1 and promotes interaction with NCOA2/GRIP1.
    Methylated at Arg-580 and Arg-604 in the KIX domain by CARM1, which blocks association with CREB, inhibits CREB signaling and activates apoptotic response. Also methylated at Arg-2142 by CARM1, which impairs interaction with NCOA2/GRIP1.
    Sumoylated; sumoylation in the transcriptional repression domain (CRD1) mediates transcriptional repression. Desumoylated by SENP3 through the removal of SUMO2 and SUMO3.
    Probable target of ubiquitination by FBXO3, leading to rapid proteasome-dependent degradation.
    Phosphorylated by HIPK2 in a RUNX1-dependent manner. This phosphorylation that activates EP300 happens when RUNX1 is associated with DNA and CBFB. Phosphorylated by ROCK2 and this enhances its activity. Phosphorylation at Ser-89 by AMPK reduces interaction with nuclear receptors, such as PPARG.
  • Cellular localizationCytoplasm. Nucleus. In the presence of ALX1 relocalizes from the cytoplasm to the nucleus. Colocalizes with ROCK2 in the nucleus.
  • Information by UniProt
  • Database links
  • Alternative names
    • E1A associated protein p300 antibody
    • E1A binding protein p300 antibody
    • E1A-associated protein p300 antibody
    • EP300 antibody
    • EP300: E1A binding protein p300 antibody
    • EP300_HUMAN antibody
    • Histone acetyltransferase p300 antibody
    • KAT3B antibody
    • p300 HAT antibody
    • RSTS2 antibody
    see all

Anti-KAT3B / p300 antibody images

  • All lanes : Anti-KAT3B / p300 antibody (ab61217) at 1/500 dilution

    Lane 1 : extracts from MDA-MB-435 cells
    Lane 2 : extracts from MDA-MB-435 cells with immunizing peptide

    Predicted band size : 290 kDa
    Observed band size : 290 kDa
  • Ab61217 at 1/50-1/100 dilution staining human lung carcinoma without (left) and with (right) immunizing peptide; paraffin embedded.

References for Anti-KAT3B / p300 antibody (ab61217)

This product has been referenced in:

See 1 Publication for this product

Product Wall

Application Western blot
Loading amount 10 cells
Gel Running Conditions Reduced Denaturing (4-12% Bis-Tris Gel)
Sample Zebrafish Tissue lysate - whole (whole embryo lysate, deyolked, 10 embryos)
Specification whole embryo lysate, deyolked, 10 embryos
Blocking step Milk as blocking agent for 1 hour(s) and 0 minute(s) · Concentration: 5% · Temperature: 25°C

Mr. Maximilian Krause

Verified customer

Submitted May 01 2014

Abcam has not validated the combination of species/application used in this Abreview.
Application Western blot
Sample Mouse Cell lysate - whole cell (Mouse Cardiomyocytes)
Loading amount 10 µg
Specification Mouse Cardiomyocytes
Gel Running Conditions Reduced Denaturing (8%)
Blocking step Milk as blocking agent for 1 hour(s) and 0 minute(s) · Concentration: 5% · Temperature: 25°C

Prof. Paul Townsend

Verified customer

Submitted Aug 12 2008