2 mg/mL.(The concentration of this product may be batch-dependent)
Lot Concentration Lookup
Storage Instructions
Shipped at 4℃. Store at +4℃ short term (1-2 weeks). It is recommended to aliquot into single-use upon delivery. Store at -20℃ long term.
Storage Buffer
1*TBS (pH7.4), 0.2% BSA, 50% Glycerol.
Isotype
IgG1
Purification Method
Protein G affinity purified.
Application Dilution
ELISA
5-20 ng/ml
WB
1,000-1:5,000
Target
Function
One distinctive HIV antigen is a viral protein called p24, a structural protein that makes up most of the HIV viral core, or 'capsid'. There are approximately 2000 molecules per virus particle, or at a molecule weight of 24 kDa, about 104 virus particles per picogram of p24. The onset of symptoms of AIDS correlates with a reduction in the number of CD4+ T-cells and increased levels of virus and p24 in the blood. It is a component of the gag polyprotein. High levels of p24 are present in the blood serum of newly infected individuals during the short period between infection and seroconversion, making p24 antigen assays useful in diagnosing primary HIV infection. Antibodies to p24 are produced during seroconversion, rendering p24 antigen undetectable after seroconversion in most cases. Therefore, p24 antigen assays are not reliable for diagnosing HIV infection after its very earliest stages. Fourth-generation HIV immunoassays detect viral p24 protein in the blood (as well as patient antibodies against the virus). Previous generation tests relied on detecting patient antibodies alone; it takes about 3–4 weeks for the earliest antibodies to be detected. The p24 protein can be detected in patient blood as early as 2 weeks after HIV infection, further reducing the window period necessary to accurately detect the HIV status of the patient.
Background References
1. Chukkapalli V. et al. Evidence in support of RNA-mediated inhibition of phosphatidylserine-dependent HIV-1 Gag membrane binding in cells. J. Virol. 87:7155-7159(2013).
2. Saad J.S. et al. Structural basis for targeting HIV-1 Gag proteins to the plasma membrane for virus assembly. Proc. Natl. Acad. Sci. U.S.A. 103:11364-11369(2006).
Sandwich ELISA analysis of p24 matched piar antibodies Elisa assay was performed by coating wells of a 96-well plate with 50 µl per well of capture antibody HA601104 [12G4-R] diluted in carbonate/bicarbonate buffer, at a concentration of 4 µg/mL overnight at 4℃. Wells of the plate were washed, blocked with 150ul 1% BSA/PBST blocking buffer, and incubated with serial diluted recombinant p24 protein starting from 3,000 pg/mL to 23.44 pg/mL for 1 hours at 37℃. The plate was washed and incubated with 50 µl per well of detect antibody HA601160 [12G2] (HRP, 1 μg/mL) for 1 hour at 37℃. Detection was performed using an Ultra TMB Substrate for 10 minutes at room temperature in the dark. The reaction was stopped with sulfuric acid and absorbances were read on a spectrophotometer at 450 nm.
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