Anti-ORAI1 Antibody

Antigen stimulation of immune cells triggers Ca++ entry through Ca++ release-activated Ca++ (CRAC) channels. ORAI1 is a recently identified four-transmembrane spanning protein that is an essential component of CRAC. A missense mutation in this protein in humans is the cause of one form of hereditary severe combined immune deficiency (SCID) which results in ablated T-cell Ca++ entry. It has been suggested that ORAI1 functions as a highly selective Ca++ plasma membrane channel that is gated through interactions with STIM1, the store-activated endoplasmic reticulum Ca++ sensor.

ORAI1 antibody was raised against an 18 amino acid synthetic peptide from near the amino terminus of human ORAI1. The immunogen is located within the first 50 amino acids of ORAI1.

Widely expressed, at a low level. Expression is detected at slightly highest levels in placenta, pancreas and spleen and at barely levels in detectable brain, testis and lung.

Ca (2+) release-activated Ca (2+) (CRAC) channel subunit which mediates Ca (2+) influx following depletion of intracellular Ca (2+) stores and channel activation by the Ca (2+) sensor, STIM1 (PubMed:16582901, PubMed:16645049, PubMed:16733527, PubMed:16766533, PubMed:16807233, PubMed:19249086, PubMed:23307288, PubMed:24351972, PubMed:24591628, PubMed:28219928) . CRAC channels are the main pathway for Ca (2+) influx in T-cells and promote the immune response to pathogens by activating the transcription factor NFAT (PubMed:16582901) .

ORAI1 antibody can be stored at 4°C for three months and -20°C, stable for up to one year. Avoid repeated freeze-thaw cycles. Antibodies should not be exposed to prolonged high temperatures.