Our Abpromise guarantee covers the use of ab56242 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
WB Use a concentration of 0.25 µg/ml. Detects a band of approximately 32 kDa (predicted molecular weight: 36 kDa). Good results were obtained when blocked with 5% non-fat dry milk in 0.05% PBS-T.
IHC-P Use a concentration of 4 - 8 µg/ml.


  • Function
    Acts as a transcriptional activator or repressor. Plays a pivotal role in regulating lineage-specific hematopoiesis by repressing ETS1-mediated transcription of erythroid-specific genes in myeloid cells. Required for monocytic, macrophage, podocyte and islet beta cell differentiation. Involved in renal tubule survival and F4/80 maturation. Activates the insulin and glucagon promoters. Together with PAX6, transactivates weakly the glucagon gene promoter through the G1 element. SUMO modification controls its transcriptional activity and ability to specify macrophage fate. Binds element G1 on the glucagon promoter (By similarity). Involved either as an oncogene or as a tumor suppressor, depending on the cell context.
  • Tissue specificity
  • Involvement in disease
    Defects in MAFB are the cause of multicentric carpotarsal osteolysis syndrome (MCTO) [MIM:166300]. MCTO is a rare skeletal disorder, usually presenting in early childhood with a clinical picture mimicking juvenile rheumatoid arthritis. Progressive destruction of the carpal and tarsal bone usually occurs and other bones may also be involved. Chronic renal failure is a frequent component of the syndrome. Mental retardation and minor facial anomalies have been noted in some patients.
  • Sequence similarities
    Belongs to the bZIP family. Maf subfamily.
    Contains 1 bZIP domain.
  • Domain
    The leucine-zipper domain is involved in the interaction with LRPICD.
  • Post-translational
    Phosphorylated by GSK3 and MAPK13 on serine and threonine residues.
    Sumoylated. Sumoylation on Lys-32 and Lys-297 stimulates its transcriptional repression activity and promotes macrophage differentiation from myeloid progenitors.
  • Cellular localization
  • Information by UniProt
  • Database links
  • Alternative names
    • Kreisler antibody
    • Kreisler (mouse) maf related leucine zipper homolog antibody
    • Kreisler maf related leucine zipper homolog antibody
    • KRML antibody
    • MAF bZIP transcription factor B antibody
    • Maf-B antibody
    • Mafb antibody
    • MAFB/Kreisler basic region/leucine zipper transcription factor antibody
    • MAFB_HUMAN antibody
    • MGC43127 antibody
    • Segmentation protein KR antibody
    • Transcription factor MafB antibody
    • V maf musculoaponeurotic fibrosarcoma oncogene homolog B (avian) antibody
    • V-maf musculoaponeurotic fibrosarcoma oncogene homolog B antibody
    see all


  • Anti-MafB antibody (ab56242) at 0.25 µg/ml + HepG2 cell lysate at 10 µg

    HRP-conjugated anti-rabbit IgG at 1/50000 dilution

    Predicted band size: 36 kDa
    Observed band size: 32 kDa
    why is the actual band size different from the predicted?

    Gel concentration 12%
  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) analysis of human spleen tissue labelling MafB with ab56242 at 4-8µg/ml. Arrows indicate positively labelled spleen cells. Magnification 400X.


This product has been referenced in:
  • Xu J  et al. MAFB mediates the therapeutic effect of sleeve gastrectomy for obese diabetes mellitus by activation of FXR expression. Braz J Med Biol Res 51:e7312 (2018). Read more (PubMed: 29846411) »
  • Gäken J  et al. A functional assay for microRNA target identification and validation. Nucleic Acids Res 40:e75 (2012). WB ; Human . Read more (PubMed: 22323518) »
See all 2 Publications for this product

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