Introduction
Uteroglobin (SCGB1A1), a member of the Secretoglobin (SCGBs) family, is a versatile protein with anti-inflammatory and anti-tumorigenic properties. It achieves this by binding to small hydrophobic molecules like phospholipids and prostaglandins. Uteroglobin plays a crucial role in various biological processes, including inflammation reduction, phospholipase A2 inhibition, and the sequestration of hydrophobic ligands. Primarily produced by Clara cells (non-ciliated, non-mucous secretory cells abundant in lung bronchioles) and other epithelia interacting with the external environment, SCGB1A1 not only sequesters pro-inflammatory mediators and carcinogens but also participates in inhibiting cell migration and invasion, platelet aggregation, and T cell differentiation. Notably, defects in the SCGB1A1 gene are linked to an increased susceptibility to asthma.
Description
Recombinant Human Uteroglobin, expressed in E. coli, is a single, non-glycosylated polypeptide chain comprising 70 amino acids. With a molecular weight of 15.8 kDa, SCGB1A1 undergoes purification using proprietary chromatographic techniques.
Physical Appearance
Sterile Filtered White lyophilized powder.
Formulation
The Uteroglobin protein was lyophilized from a 0.2µm filtered solution concentrated in PBS with a pH of 7.4.
Solubility
For reconstitution of lyophilized SCGB1A1, sterile 18M-cm H₂O at a concentration of at least 100µg/ml is recommended. This solution can be further diluted with other aqueous solutions.
Stability
Lyophilized Uteroglobin remains stable at room temperature for up to 3 weeks; however, storage in desiccated conditions below -18°C is recommended. After reconstitution, SCGB1A1 should be stored at 4°C for 2-7 days. For long-term storage, adding a carrier protein (0.1% HSA or BSA) is advisable. It is important to avoid repeated freeze-thaw cycles.
Purity
Purity exceeds 98.0% as determined by: (a) Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) analysis and (b) Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis (SDS-PAGE) analysis.
Biological Activity
The ED₅₀, determined by the immobilized protein's ability to support the adhesion of A549 human lung carcinoma cells, is less than 5.0µg/ml. This corresponds to a specific activity exceeding 200 IU/mg.
Synonyms
Uteroglobin, Clara cell phospholipid-binding protein, CCPBP, Clara cells 10 kDa secretory protein, CC10, Secretoglobin family 1A member 1, Urinary protein 1, UP-1, UP1, Urine protein 1, SCGB1A1, CCSP, UGB, CC16.
Amino Acid Sequence
EICPSFQRVI ETLLMDTPSS YEAAMELFSP DQDMREAGAQ LKKLVDTLPQ KPRESIIKLM EKIAQSSLCN.