• Product name

    Anti-StAR antibody [STAR/2154]
    See all StAR primary antibodies
  • Description

    Mouse monoclonal [STAR/2154] to StAR
  • Host species

  • Tested applications

    Suitable for: Protein Array, IHC-Pmore details
  • Species reactivity

    Reacts with: Human
  • Immunogen

    Recombinant fragment within Human StAR aa 39-108. The exact sequence is proprietary.
    Database link: P49675

  • Positive control

    • IHC-P: Human adrenal gland and testicular carcinoma tissues.



Our Abpromise guarantee covers the use of ab238057 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
Protein Array Use at an assay dependent concentration.
IHC-P Use a concentration of 1 - 2 µg/ml. Perform heat mediated antigen retrieval with citrate buffer pH 6 before commencing with IHC staining protocol.

Incubate with primary ab for 30 minutes at RT


  • Function

    Plays a key role in steroid hormone synthesis by enhancing the metabolism of cholesterol into pregnenolone. Mediates the transfer of cholesterol from the outer mitochondrial membrane to the inner mitochondrial membrane where it is cleaved to pregnenolone.
  • Tissue specificity

    Expressed in gonads, adrenal cortex and kidney.
  • Pathway

    Steroid metabolism; cholesterol metabolism.
  • Involvement in disease

    Defects in STAR are the cause of adrenal hyperplasia type 1 (AH1) [MIM:201710]. The most severe form of adrenal hyperplasia. It is a condition characterized by onset of profound adrenocortical insufficiency shortly after birth, hyperpigmentation reflecting increased production of pro-opiomelanocortin, elevated plasma renin activity as a consequence of reduced aldosterone synthesis, and male pseudohermaphroditism resulting from deficient fetal testicular testosterone synthesis. Affected individuals are phenotypic females irrespective of gonadal sex, and frequently die in infancy if mineralocorticoid and glucocorticoid replacement are not instituted.
  • Sequence similarities

    Contains 1 START domain.
  • Cellular localization

  • Information by UniProt
  • Database links

  • Alternative names

    • Cholesterol trafficker antibody
    • Luteinizing hormone induced protein antibody
    • mitochondrial antibody
    • Mitochondrial steroid acute regulatory protein antibody
    • StAR antibody
    • StAR related lipid transfer (START) domain containing 1 antibody
    • STAR_HUMAN antibody
    • StARD1 antibody
    • START domain containing 1 antibody
    • START domain containing protein 1 antibody
    • START domain-containing protein 1 antibody
    • Steroid acute regulatory protein antibody
    • Steroidogenic acute regulator antibody
    • Steroidogenic acute regulatory protein antibody
    • Steroidogenic acute regulatory protein mitochondrial antibody
    see all


  • ab238057 was tested in protein array against over 19000 different full-length human proteins.
    Z- and S- Score: The Z-score represents the strength of a signal that a monoclonal antibody (MAb) (in combination with a fluorescently-tagged anti-IgG secondary antibody) produces when binding to a particular protein on the HuProtTM array. Z-scores are described in units of standard deviations (SD's) above the mean value of all signals generated on that array. If targets on HuProtTM are arranged in descending order of the Z-score, the S-score is the difference (also in units of SD's) between the Z-score. S-score therefore represents the relative target specificity of a MAb to its intended target.
    A MAb is specific to its intended target if the MAb has an S-score of at least 2.5. For example, if a MAb binds to protein X with a Z-score of 43 and to protein Y with a Z-score of 14, then the S-score for the binding of that MAb to protein X is equal to 29.
  • Formalin-fixed, paraffin-embedded human testicular carcinoma tissue stained for StAR using ab238057 at 2 μg/mL in immunohistochemical analysis.

  • Formalin-fixed, paraffin-embedded human testicular carcinoma tissue stained for StAR using ab238057 at 2 μg/mL in immunohistochemical analysis.

  • Formalin-fixed, paraffin-embedded human adrenal gland tissue stained for StAR using ab238057 at 2 μg/mL in immunohistochemical analysis.


ab238057 has not yet been referenced specifically in any publications.

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