Recombinant Human IGFALS/ALS Protein, CF

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Recombinant Human IGFALS/ALS Protein Binding Activity
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Recombinant Human IGFALS/ALS Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Measured by its binding ability in a functional ELISA. In the presence of Recombinant Human IGFBP-3 (Catalog # 675-B3), immobilized Recombinant Human IGFALS/ALS (0.5 µg/mL, 100 µL/well) can bind Recombinant Human IGF-I (Catalog # 291-G1) with an ED50 of 15-90 ng/mL.
Chinese Hamster Ovary cell line, CHO-derived human IGFALS/ALS protein
Ala28-Cys605, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Predicted Molecular Mass
64 kDa
76-88 kDa, reducing conditions

Product Datasheets

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Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 500 μg/mL in PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage:
  • 12 months from date of receipt, ≤ -20 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, ≤ -20 °C under sterile conditions after reconstitution.

Scientific Data

Binding Activity Recombinant Human IGFALS/ALS Protein Binding Activity View Larger

Immobilized Recombinant Human IGFALS/ALS (Catalog # 9917-IA) binds to Recombinant Human IGF-1 (Catalog # 291-G1) in the presence of Recombinant Human IGFBP-3 (Catalog # 675-B3). The ED50 for the binding is 15-90 ng/mL.

SDS-PAGE Recombinant Human IGFALS/ALS Protein SDS-PAGE View Larger

2 μg/lane of Recombinant Human IGFALS was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® blue staining, showing bands at 76-88 kDa.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: IGFALS/ALS

IGFALS (Insulin-like growth factor-binding protein complex acid labile subunit) or ALS (Acid labile subunit) is an 84-86 kDa glycoprotein member of the leucine rich repeat superfamily of molecules. It is secreted by hepatocytes in response to growth hormone stimulation, and forms a 140-150 kDa ternary complex with IGFBP3 (or IGFBP5) and IGF-I (1, 2). This complex increases the half-life of IGF-I and retains it in the circulation for use in multiple tissues. Natural variants of IGFALS/ALS have been found in idiopathic short stature in children (3, 4). Mature human IGFALS/ALS is 578 amino acids (aa) in length (aa 28-605). It contains twenty-one 20-23 aa LRRs that participate in protein-protein interactions. Structural studies have predicted the molecule to be a torus with a cluster of negative charge on the inside (5). Over aa 28-603, human IGFALS/ALS shares 79% and 78% aa identity with mouse and rat IGFALS/ALS, respectively.

  1. Belgorosky A. and Rivarola M.A. (1999) Horm. Res. 52:60.
  2. Fofanova-Gambetti O.V. et al. (2009) Horm. Res. 71:100.
  3. Domené, H.M, et al. (2013) Horm. Res. Paediatr. 80:413.
  4. Martucci, L.C. et al. (2016) Mol. Cell. Endocrinol. 429:19.
  5. Janosi, J.B.M. et al. (1999) J. Biol. Chem. 274:23328.
Long Name
IGF-binding Protein Acid Labile Subunit
Entrez Gene IDs
3483 (Human); 16005 (Mouse)
Alternate Names


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