• Form
  • Storage instructions
    Shipped at 4°C. Store at +4°C short term (1-2 weeks). Upon delivery aliquot. Store at -20°C or -80°C. Avoid freeze / thaw cycle.
  • Storage buffer
    Preservative: 0.05% Sodium azide
    Constituents: 0.1% BSA, 99% PBS
  • Concentration information loading...
  • Purity
    Immunogen affinity purified
  • Primary antibody notes
    Amyloid beta peptide is the major constituent of amyloid plaques in the brains of individuals afflicted with Alzheimer’s disease. This peptide is generated from the beta-amyloid precursor protein (beta APP) in a two-step process. The first step involves cleavage of the extracellular, amino-terminal domain of beta APP. Protein cleavage is performed by an aspartyl protease termed beta-secretase (BACE). This enzyme is synthesized as a propeptide that must be modified to the mature and active form by the prohormone convertase, furin. Beta APP cleavage by the mature form of BACE results in the cellular secretion of a segment of beta APP and a membrane-bound remnant. This remnant is then processed by another protease termed gamma-secretase. Gamma-secretase cleaves an intra-membrane site in the carboxyl-terminal domain of beta APP, thus generating the amyloid beta peptide. Gamma-secretase is believed to be a multi-subunit complex containing presenilin-1 and 2 as central components. Found associated with the presenilins is the transmembrane glycoprotein nicastrin. Nicastrin has been found to bind to the carboxyl-terminus of beta APP and helps to modulate the production of the amyloid beta peptide. Also found in the neurofibrillary lesions associated with Alzheimer’s disease is a protein termed Tau. Tau is a neuronal microtubule-associated protein found predominantly on axons. Tau functions to promote tubulin polymerization and stabilize microtubules. Tau, in its hyperphosphorylated form, is the major constituent of paired helical filaments (PHF), which are the building block of neurofibrillary lesions found in brain tissue of Alzheimer’s diseased patients.
  • Clonality
  • Isotype
  • Research areas


Our Abpromise guarantee covers the use of ab3444 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
IP Use at an assay dependent concentration.
ICC Use at an assay dependent concentration.
WB Use a concentration of 1 µg/ml. Detects a band of approximately 110 kDa (predicted molecular weight: 78 kDa).Can be blocked with Nicastrin peptide (ab4977).


  • Function
    Essential subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral membrane proteins such as Notch receptors and APP (beta-amyloid precursor protein). It probably represents a stabilizing cofactor required for the assembly of the gamma-secretase complex.
  • Tissue specificity
    Widely expressed.
  • Sequence similarities
    Belongs to the nicastrin family.
  • Cellular localization
    Membrane. Melanosome. Identified by mass spectrometry in melanosome fractions from stage I to stage IV.
  • Information by UniProt
  • Database links
  • Alternative names
    • Anterior pharynx defective 2 antibody
    • APH 2 antibody
    • APH2 antibody
    • ATAG1874 antibody
    • KIAA0253 antibody
    • Ncstn antibody
    • NCT antibody
    • NICA_HUMAN antibody
    • Nicastrin antibody
    • RP11 517F10.1 antibody
    • RP11517F101 antibody
    see all


  • Western blot detection of Nicastrin on mouse primary cultured neuronal cells using ab3444. 


This product has been referenced in:
  • Pintchovski SA  et al. Evidence that enzyme processivity mediates differential Aß production by PS1 and PS2. Curr Alzheimer Res 10:4-10 (2013). WB . Read more (PubMed: 22950863) »
  • Steuble M  et al. Calsyntenin-1 shelters APP from proteolytic processing during anterograde axonal transport. Biol Open 1:761-74 (2012). Read more (PubMed: 23213470) »
See all 3 Publications for this product

Customer reviews and Q&As


Thank you for your patience. I have received a reply from the originator of ab45425 (Nicastrin antibody). The immunogenic peptide sequence is proprietary information but they have performed a sequence alignment for you. Based on the alignment results, we know it is unlikely that this product will react with Dictyostelium discoideum and we do not recommend using ab45425 with this species. Please don't hesitate to contact us again if you have further questions.

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