Human-retinol binding protein is a single-chain polypeptide with a molecular weight of approximately 21000 and one binding site for retinol and other forms of vitamin A. In plasma, RBP4-retinol forms a complex with transthyretin (TTR), also known as thyroxine-binding protein and prealbumin. Defects in RBP4 cause retinol-binding protein deficiency, which affects night vision.
Measured by its ability to bind all-trans retinoic acid, the binding of retinoic acid results in the quenching of Trp fluorescence in RBP4 > 1.0 µM all-trans retinoic acid is bound under the described conditions.
Accession: P02753
Apparent Molecular Weight: ~22 kDa, reducing conditions
Endotoxin < 0.2 EU/μg
Lyophilized from a 0.2 μm filtered solution in 50 mM Tris-HCl, 150 mM NaCl, pH 7.5.
| Form | Lyophilized powder |
| Solubility (25°C) | Reconstitute the lyophilized powder in ddH2O or PBS up to 100 μg/ml. |
| Storage | Stable for up to 6 months at ≤ -20°C. Upon reconstitution, the product should be stable for up to 1 week at 4°C or up to 3 months at -20°C. |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
[2] Primoz Kotnik et al. PLoS One. Interleukin-1β downregulates RBP4 secretion in human adipocytes
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