IGFBP3 / IBP3 recombinant protein

Recombinant Human IGFBP3 / IBP3 Protein (His tag)

Cat. Num. AAA2546264

• Gene Names: IGFBP3; IBP3; BP-53
• Purity: > 85 % as determined by SDS-PAGE
• Synonyms: IGFBP3 / IBP3; Recombinant Human IGFBP3 / IBP3 Protein (His tag); IGFBP3; tcag7.703; BP-53; IBP3; IGFBP3 / IBP3 recombinant protein

• Host: Human Cells
• Purity/Purification: > 85 % as determined by SDS-PAGE
• Form/Format: Lyophilized from sterile PBS, pH 7.4
• Sequence Length: 291

• Application Notes: The secreted recombinant human IGFBP3 comprises 280 amino acids with a predicted molecular mass of 31 kDa. As a result of glycosylation, the apparent molecular mass of rhIGFBP3 is approximately 40-45 kDa in SDS-PAGE under reducing conditions.
• Predicted N Terminal: His 1
• Endotoxin: < 1.0 EU per mug of the protein as determined by the LAL method
• Preparation and Storage: Samples are stable for up to twelve months from date of receipt at -70 degree C

SDS-PAGE

Related Product Information for IGFBP3 / IBP3 recombinant protein

Background: The Insulin-like Growth Factor (IGF) signaling system plays a central role in cellular growth, differentiation and proliferation. IGFBP3 is the most abundant IGF binding protein in human serum and has been shown to be a growth inhibitory, apoptosis-inducing molecule, capable of acting via IGF-dependent and IGF-independent mechanisms. It appears to function both by cell cycle blockade and the induction of apoptosis. IGFBP3 can be transported to the nucleus by an importin beta mediated mechanism, where it has been shown to interact with the retinoid X receptor alpha and possibly other nuclear elements. IGFBP3 antiproliferative signalling appears to require an active transforming growth factor beta (TGF-beta) signalling pathway, and IGFBP3 stimulates phosphorylation of the TGF-beta signalling intermediates Smad2 and Smad3. IGFBP3 has IGF-independent roles in inhibiting cell proliferation in cancer cell lines. Nuclear transcription factor, retinoid X receptor (RXR)-alpha, and IGFBP3 functionally interact to reduce prostate tumor growth and prostate-specific antigen in vivo. Several clinical studies have proposed that individuals with IGFBP3 levels in the upper range of normal may have a decreased risk for certain common cancers. This includes evidence of a protective effect against breast cancer, prostate cancer, colorectal cancer, and lung cancer. Moreover, IGFBP3 inhibits insulin-stimulated glucose uptake into adipocytes independent of IGF.

Description: A DNA sequence encoding the mature form of human IGFBP3 (NP_000589.2) (Gly28-Lys 291) was fused with a polyhistidine tag at the N-terminus.

NCBI and Uniprot Product Information

• NCBI GI #: 62243068
• NCBI GeneID: 3486
• NCBI Accession #: NP_000589.2
• NCBI GenBank Nucleotide #: NM_000598.4
• UniProt Accession #: P17936; Q2V509; Q6P1M6; Q9UCL4; A4D2F5; D3DVM0
• Molecular Weight: 32,223 Da
• NCBI Official Full Name: insulin-like growth factor-binding protein 3 isoform b
• NCBI Official Synonym Full Names: insulin like growth factor binding protein 3
• NCBI Official Symbol: IGFBP3
• NCBI Official Synonym Symbols: IBP3; BP-53
• NCBI Protein Information: insulin-like growth factor-binding protein 3
• UniProt Protein Name: Insulin-like growth factor-binding protein 3
• UniProt Gene Name: IGFBP3
• UniProt Synonym Gene Names: IBP3; IBP-3; IGF-binding protein 3; IGFBP-3

NCBI Description

This gene is a member of the insulin-like growth factor binding protein (IGFBP) family and encodes a protein with an IGFBP domain and a thyroglobulin type-I domain. The protein forms a ternary complex with insulin-like growth factor acid-labile subunit (IGFALS) and either insulin-like growth factor (IGF) I or II. In this form, it circulates in the plasma, prolonging the half-life of IGFs and altering their interaction with cell surface receptors. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. [provided by RefSeq, Jul 2008]

Uniprot Description

IGFBP3: IGF-binding proteins prolong the half-life of the IGFs and have been shown to either inhibit or stimulate the growth promoting effects of the IGFs on cell culture. They alter the interaction of IGFs with their cell surface receptors. Also exhibits IGF-independent antiproliferative and apoptotic effects mediated by its receptor TMEM219/IGFBP-3R.

Protein type: Cell development/differentiation; Secreted; Secreted, signal peptide

Chromosomal Location of Human Ortholog: 7p12.3

Cellular Component: extracellular region; extracellular space; insulin-like growth factor binding protein complex; nucleus

Molecular Function: fibronectin binding; insulin-like growth factor I binding; insulin-like growth factor II binding; protein binding; protein tyrosine phosphatase activator activity

Biological Process: cellular protein metabolic process; negative regulation of cell proliferation; negative regulation of protein amino acid phosphorylation; negative regulation of smooth muscle cell migration; negative regulation of smooth muscle cell proliferation; positive regulation of apoptosis; positive regulation of myoblast differentiation; protein amino acid phosphorylation; regulation of apoptosis; regulation of insulin-like growth factor receptor signaling pathway