• Nature

Associated products


Our Abpromise guarantee covers the use of ab74434 in the following tested applications.

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

  • Purity
    70 - 90% by HPLC.

  • Form
  • Additional notes

    - First try to dissolve a small amount of peptide in either water or buffer. The more charged residues on a peptide, the more soluble it is in aqueous solutions.
    - If the peptide doesn’t dissolve try an organic solvent e.g. DMSO, then dilute using water or buffer.
    - Consider that any solvent used must be compatible with your assay. If a peptide does not dissolve and you need to recover it, lyophilise to remove the solvent.
    - Gentle warming and sonication can effectively aid peptide solubilisation. If the solution is cloudy or has gelled the peptide may be in suspension rather than solubilised.
    - Peptides containing cysteine are easily oxidised, so should be prepared in solution just prior to use.

  • Concentration information loading...

Preparation and Storage

  • Stability and Storage

    Shipped at 4°C. Upon delivery aliquot and store at -20°C or -80°C. Avoid repeated freeze / thaw cycles.

    Information available upon request.

General Info

  • Alternative names
    • Leukocyte L1 complex heavy chain
    • 60B8AG
    • CAGB
    • Calgranulin B
    • Calgranulin-B
    • Calprotectin L1H subunit
    • CFAG
    • CGLB
    • Cystic fibrosis antigen B
    • L1AG
    • Leukocyte L1 complex heavy chain
    • LIAG
    • MAC387
    • MIF
    • Migration inhibitory factor related protein 14
    • Migration inhibitory factor-related protein 14
    • MRP 14
    • MRP-14
    • MRP14
    • Myeloid-related protein 14
    • NIF
    • OTTHUMP00000015331
    • p14
    • Protein S100-A9
    • S100 A9
    • S100 calcium binding protein A9
    • S100 calcium binding protein A9 calgranulin B
    • S100 calcium-binding protein A9
    • S100A9
    • S10A9_HUMAN
    see all
  • Function
    Calcium-binding protein. Has antimicrobial activity towards bacteria and fungi. Important for resistance to invasion by pathogenic bacteria. Up-regulates transcription of genes that are under the control of NF-kappa-B. Plays a role in the development of endotoxic shock in response to bacterial lipopolysaccharide (LPS) (By similarity). Promotes tubulin polymerization when unphosphorylated. Promotes phagocyte migration and infiltration of granulocytes at sites of wounding. Plays a role as a pro-inflammatory mediator in acute and chronic inflammation and up-regulates the release of IL8 and cell-surface expression of ICAM1. Extracellular calprotectin binds to target cells and promotes apoptosis. Antimicrobial and proapoptotic activity is inhibited by zinc ions.
  • Tissue specificity
    Expressed by macrophages in acutely inflammed tissues and in chronic inflammation. Detected in peripheral blood leukocytes, in neutrophils and granulocytes. Detected at sites of vascular inflammation (at protein level). Also expressed in epithelial cells constitutively or induced during dermatoses.
  • Sequence similarities
    Belongs to the S-100 family.
    Contains 2 EF-hand domains.
  • Post-translational
    Phosphorylated. Phosphorylation inhibits activation of tubulin polymerization.
  • Cellular localization
    Secreted. Cytoplasm. Cytoplasm > cytoskeleton. Cell membrane. Associates with tubulin filaments in activated monocytes. Targeted to the cell surface upon calcium influx. Released from blood leukocytes upon exposure to CSF2/GM-CSF, bacterial lipopolysaccharide (LPS) and during inflammatory processes. Serum levels are high in patients suffering from chronic inflammation.
  • Information by UniProt

References for Human S100A9 peptide (ab74434)

ab74434 has not yet been referenced specifically in any publications.

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The immunogen for ab50143 is full length S100A9 (113 amino acids). However, the epitope for the antibody is not mapped. Since it is a monoclonal antibody, it can only recognise a single epitope along the full len...

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