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Recombinant Human IGF-BP3 (rHuIGF-BP3)

IGF-BP3 is a 30 kDa cysteine-rich secreted protein. It is the major IGF binding protein present in the plasma of human and animals and it is also found in α-granules of platelets. In addition to its ability to modulate the activity of IGF-I and IGF-II, IGF-BP3 exerts inhibitory effects on follicle stimulating hormone (FSH) activity. Decreased plasma levels of IGF-BP3 often results in dwarfism, whereas elevated levels of IGF-BP3 may lead to acromegaly. The expression of IGF-BP3 in fibroblasts is stimulated by mitogenic growth factors such as Bombesin, Vasopressin, PDGF, and EGF.

Product Specifications

Source

Escherichia coli.

Field of Research

Immunology & Inflammation; Cell Biology

Endotoxin

Less than 1EU/mg of rHuIGF-BP3 as determined by LAL method.

Purity

>98% by SDS-PAGE and HPLC analyses.

Bioactivity

The ED50 was determined by its ability to inhibit IGF-II induced proliferation of MCF-7. The expected ED50 for this effect is ≤ 0.2 μg/ml in presence of 15 ng/ml of human IGF-II, corresponding to a Specific Activity of >5000 IU/mg.

Form

Lyophilized from a 0.2mm filtered concentrated solution in PBS, pH 7.4.

Molecular Weight

28.8 kDa protein consisting of 264 amino acid residues..

Storage Conditions

This lyophilized preparation is stable at 2-8°C, but should be kept at -20°C for long term storage, preferably desiccated. Upon reconstitution, the preparation is stable for up to one week at 2-8°C. For maximal stability, apportion the reconstituted preparation into working aliquots and store at -20°C to -70°C. Avoid repeated freeze/thaw cycles.

Notes

For research use only.

Applications Notes

We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute in sterile distilled water or aqueous buffer containing 0.1% BSA to a concentration of 0.1-1.0 mg/mL. Stock solutions should be apportioned into working aliquots and stored at < -20°C. Further dilutions should be made in appropriate buffered solutions.

Preservative

Lyophilized from a 0.2mm filtered concentrated solution in PBS, pH 7.4.

AA Sequence

GASSGGLGPVVRCEPCDARALAQCAPPPAVCAELVREPGCGCCLTCALSEGQPCGIYTERCGSGLRCQPSPDEARPLQALLDGRGLCVNASAVSRLRAYLLPAPPAPGNASESEEDRSAGEVESPSVSSTHRVSDPKFHPLHSKIIIIKKGHAKDSQRYKVDYESQSTDTQNFSSESKRETEYGPCRREMEDTLNHLKFLNVLSPRGVHIPNCDKKGFYKKKQCRPSKGRKRGFCWCVDKYGQPLPGYTTKGKEDVHCYS MQSK

Available Sizes

Frequently Asked Questions

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