Serum albumin, the main protein of plasma, has a good binding capacity for water, Ca(2+), Na(+), K(+), fatty acids, hormones, bilirubin and drugs. Albumin is essential for maintaining the osmotic pressure needed for proper distribution of body fluids between intravascular compartments and body tissues. It also acts as a plasma carrier by non-specifically binding several hydrophobic steroid hormones and as a transport protein for hemin and fatty acids.
Background References
1. Carninci P., Kasukawa T., Katayama S., Gough J., Frith M.C., Maeda N., Oyama R., Ravasi T., Lenhard B., Wells C., Kodzius R., Shimokawa K., Bajic V.B., Brenner S.E., Batalov S., Forrest A.R., Zavolan M., Davis M.J., Wilming L.G., , Hayashizaki Y.;"The transcriptional landscape of the mammalian genome.";Science 309:1559-1563(2005).
2. The MGC Project Team;"The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).";Genome Res. 14:2121-2127(2004).
Sequence Similarity
Belongs to the ALB/AFP/VDB family.
Tissue Specificity
Plasma.
Post-translational Modification
Kenitra variant is partially O-glycosylated at Thr-620. It has two new disulfide bonds Cys-600 to Cys-602 and Cys-601 to Cys-606.; Glycated in diabetic patients.; Phosphorylated by FAM20C in the extracellular medium.; Acetylated on Lys-223 by acetylsalicylic acid.
Western blot analysis of Albumin on different lysates with Rabbit anti-Albumin antibody (0806-9) at 1/20,000 dilution.
Lane 1: Hep G2 (Human hepatocellular carcinoma cell) cell lysate (15 µg/Lane) Lane 2: Mouse liver tissue lysate (30 µg/Lane) Lane 3: Rat brain liver lysate(30 µg/Lane)
Exposure time: 180 seconds ; ECL: K1802
Blocking: 5% NFDM/TBST, 1 hour at room temperature Primary antibody: 0806-9, 1/20,000 in primary antibody dilution buffer (K1803), overnight at 4 ℃ Secondary antibody: Goat anti-Rabbit IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 67 kDa Observed band size: 67 kDa
ICC staining Albumin in D3 cells (red). Cells were fixed in paraformaldehyde, permeabilised with 0.25% Triton X100/PBS.
Immunohistochemical analysis of paraffin-embedded human liver tissue with Rabbit anti-Albumin antibody (0806-9) at 1/50 dilution.
The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 9.0) for 20 minutes. The tissues were blocked in 1% BSA for 20 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (0806-9) at 1/50 dilution for 1 hour at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
Flow cytometric analysis of HepG2 cells labeling Albumin.
Cells were fixed and permeabilized. Then stained with the primary antibody (0806-9, 1/50) (red) . After incubation of the primary antibody at +4℃ for an hour, the cells were stained with a iFluor™ 488 conjugate-Goat anti-Rabbit IgG Secondary antibody (HA1121) at 1/1,000 dilution for 30 minutes at +4℃. Unlabelled sample was used as a control (cells without incubation with primary antibody; black).
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