RBP4 Protein (AA 19-201, C-Term)

Catalog No. ABIN2666743

Product Details

Target: RBP4 (Retinol Binding Protein 4, Plasma (RBP4))

Protein Type: Recombinant

Biological Activity: Active

Protein Characteristics: AA 19-201, C-Term

Origin: Human

Source: CHO Cells

Application: Flow Cytometry (FACS)

Purity: > 95 % , as determined by Coomassie stained SDS-PAGE.

Sterility: 0.22 μm filtered

Endotoxin Level:

Less than 0.1 EU per μg of protein as determine by the LAL method.

Application Details

Application Notes: Optimal working dilution should be determined by the investigator.

Comment:

Biological activity: Measured by its ability to bind all-trans retinoic acid. The binding of retinoic acid results in the quenching of tryptophan fluorescence in RBP4. The ED50 of RBP4 to all-trans rentinoic acid is >0.5 μM.

Restrictions: For Research Use only

Handling

Format: Liquid

Reconstitution: For maximum results, quick spin vial prior to opening. After dilution, the protein can be stored between 2 °C and 8 °C for one month or from -20 °C to -70 °C for up to 3 months.

Concentration: 200 μg/mL

Buffer: 0.22 μm filtered protein solution is in PBS.

Handling Advice: Avoid repeated freeze/thaw cycles.

Storage: -20 °C

Storage Comment: Unopened vial can be stored between 2°C and 8°C for three months, at -20°C for six months, or at -70°C for one year.

Target Details

Target: RBP4 (Retinol Binding Protein 4, Plasma (RBP4))

Alternative Name: RBP4 (RBP4 Products)

Synonyms: RDCCAS Protein, RBP Protein, RNBP Protein, rbp4 Protein, MGC54038 Protein, srbp Protein, PRBP Protein, RBPA Protein, Rbp-4 Protein, fb23c12 Protein, rbp Protein, wu:fb23c12 Protein, wu:fb58d04 Protein, wu:fb72b04 Protein, zgc:86911 Protein, retinol binding protein 4 Protein, renin binding protein Protein, retinol binding protein 4 S homeolog Protein, retinol binding protein 4 A, plasma Protein, retinol binding protein 4, plasma Protein, retinol binding protein 4 L homeolog Protein, RBP4 Protein, RENBP Protein, rbp4.S Protein, rbp4 Protein, Rbp4 Protein, RBP4A Protein, rbp4.L Protein

Background: RBP4 belongs to the lipocalin family, and it is the retinol (vitamin A alcohol) specific transport protein present in plasma. It has a β barrel structure with a well defined cavity, which accommodates retinol. The stability of the retinol-RBP (holo-RBP) complex is further enhanced when the complex is bound to transthyretin (TTR). RBP4 delivers retinol from the liver stores to the peripheral tissues. The interaction of RBP-retinol complex with TTR prevents its loss by filtration through the kidney glomeruli. Apo-RBP4 (without retinol) is reabsorbed in the proximal tubular cells. A deficiency of vitamin A blocks secretion of the binding protein post-translationally and results in defective delivery and supply to the epidermal cells. Defects in RBP4 cause retinol-binding protein deficiency and can cause night vision problems. RBP4 has been described as an adipokine and is found to be expressed in adipose tissue and correlated with obesity, insulin resistance, and type 2 diabetes. It has been postulated that RBP4 acts as the mechanistic link by which decreased adipocyte GLUT4 expression contributes to insulin resistance. Circulating RBP4 concentrations are increased in insulin-resistant mice. Moreover, transgenic overexpression of human RBP4 and injection of recombinant RBP4 decreased insulin sensitivity in normal mice, whereas genetic deletion of the RBP4 gene or normalization of RBP4 concentrations in obese mice improved insulin sensitivity. RBP4 concentrations are also increased in obese humans, and higher concentrations have been correlated with lower insulin sensitivity and other components of the metabolic syndrome.

Molecular Weight: The 190 amino acid recombinant protein has a predicted molecular mass of approximately 22 kDa. The protein migrates as above 25 kDa in SDS-PAGE in DTT-reducing condition and above 22 kDa in non-reducing condition. The N-terminal amino acid is Gln.

Pathways: Regulatory RNA Pathways, Positive Regulation of Peptide Hormone Secretion, Carbohydrate Homeostasis, Production of Molecular Mediator of Immune Response