Human RBP4 Protein (His Tag)

RDCCAS

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Catalog Number	P10354-H08H
Organism Species	Human
Host	Human Cells
Synonyms	RDCCAS
Molecular Weight	The recombinant human RBP4 consists of 194 amino acids after removal of the signal peptide and migrates as an approximately 23 kDa protein as predicted.
predicted N	Glu 19
SDS-PAGE
Purity	> 85 % as determined by SDS-PAGE
Protein Construction	A DNA sequence encoding the pro form of human RBP4 (NP_006735.2) (Met 1-Leu 201) was expressed with a C-terminal polyhistidine tag.
Bio-activity	Measured by its ability to bind all-trans retinoic acid. The binding of retinoic acid results in the quenching of Trp fluorescence in RBP4. The 50% binding concentration (BC50) is > 1.0 µM.
Research Area	Cancer |Signal transduction |Metabolism |Types of disease |Metabolism in Heart disease
Formulation	Lyophilized from sterile PBS, pH 7.2 1. Normally 5 % - 8 % trehalose and mannitol are added as protectants before lyophilization. Specific concentrations are included in the hardcopy of COA.
Background	Retinol-binding protein 4 (RBP4) is the specific carrier for retinol (also known as vitamin A), and is responsible for the conversion of unstable and insoluble retinol in aqueous solution into stable and soluble complex in plasma through their tight interaction. As a member of the lipocalin superfamily, RBP4 containing a β-barrel structure with a well-defined cavity is secreted from the liver, and in turn delivers retinol from the liver stores to the peripheral tissues. In plasma, the RBP4-retinol complex interacts with transthyretin (TTR), and this binding is crucial for preventing RBP4 excretion through the kidney glomeruli. RBP4 expressed from an ectopic source efficiently delivers retinol to the eyes, and its deficiency affects night vision largely. Recently, RBP4 as an adipokine, is found to be expressed in adipose tissue and correlated with obesity, insulin resistance (IR) and type 2 diabetes (T2DM).
Reference	Yang Q, et al. (2005) Serum retinol binding protein 4 contributes to insulin resistance in obesity and type 2 diabetes. Nature. 436(7049): 356-62. Choi SH, et al. (2008) High plasma retinol binding protein-4 and low plasma adiponectin concentrations are associated with severity of glucose intolerance in women with previous gestational diabetes mellitus. J Clin Endocrinol Metab. 93(8): 3142-8. Tepper BJ, et al. (2010) Serum retinol-binding protein 4 (RBP4) and retinol in a cohort of borderline obese women with and without gestational diabetes. Clin Biochem. 43(3): 320-3.