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Assembles with ORAI1 and ORAI3 to form hexameric CRAC channels that mediate Ca(2+) influx upon depletion of endoplasmic reticulum Ca(2+) store and channel activation by Ca(2+) sensor STIM1, a process known as store-operated Ca(2+) entry (SOCE). Various pore subunit combinations may account for distinct CRAC channel spatiotemporal and cell-type specific dynamics. ORAI1 mainly contributes to the generation of Ca(2+) plateaus involved in sustained Ca(2+) entry and is dispensable for cytosolic Ca(2+) oscillations, whereas ORAI2 and ORAI3 generate oscillatory patterns. CRAC channels assemble in Ca(2+) signaling microdomains where Ca(2+) influx is coupled to calmodulin and calcineurin signaling and activation of NFAT transcription factors recruited to ORAI1 via AKAP5. 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ORAI2 channels display prominent FCDI (PubMed:19706554). Inhibited by lanthanides such as Gd(3+) ions (PubMed:16807233)"}],"commentType":"ACTIVITY REGULATION"},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"17442569"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"19706554"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"20418871"},{"evidenceCode":"ECO:0000269","source":"PubMed","id":"32415068"}],"value":"Oligomerizes in homomeric and heteromeric ORAI complexes. Native CRAC channels most likely consist of hexameric ORAI heteromers, implying that diverse ORAI1, ORAI2 and ORAI3 subunit combinations with distinct biophysical properties can operate in a cell-type specific way (PubMed:17442569, PubMed:32415068). Interacts with STIM1; this regulates channel activity (PubMed:19706554, PubMed:32415068). Interacts with CRACR2A/EFCAB4B"}],"commentType":"SUBUNIT"},{"commentType":"SUBCELLULAR LOCATION","note":{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"19706554"}],"value":"Colocalizes with STIM1 upon store depletion"}]},"subcellularLocations":[{"location":{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"17452328"}],"value":"Cell membrane","id":"SL-0039"},"topology":{"evidences":[{"evidenceCode":"ECO:0000255"}],"value":"Multi-pass membrane protein","id":"SL-9909"}}]},{"texts":[{"evidences":[{"evidenceCode":"ECO:0000305"}],"value":"Belongs to the Orai family"}],"commentType":"SIMILARITY"},{"commentType":"SEQUENCE CAUTION","sequenceCautionType":"Erroneous translation","sequence":"AAG23755.1","note":"Wrong choice of CDS.","evidences":[{"evidenceCode":"ECO:0000305"}]},{"commentType":"SEQUENCE CAUTION","sequenceCautionType":"Erroneous gene model prediction","sequence":"AAP22352.1","evidences":[{"evidenceCode":"ECO:0000305"}]},{"commentType":"SEQUENCE CAUTION","sequenceCautionType":"Erroneous translation","sequence":"CAG33568.1","note":"Wrong choice of CDS.","evidences":[{"evidenceCode":"ECO:0000305"}]}],"features":[{"type":"Chain","location":{"start":{"value":1,"modifier":"EXACT"},"end":{"value":254,"modifier":"EXACT"}},"description":"Protein orai-2","featureId":"PRO_0000234391"},{"type":"Transmembrane","location":{"start":{"value":66,"modifier":"EXACT"},"end":{"value":83,"modifier":"EXACT"}},"description":"Helical","evidences":[{"evidenceCode":"ECO:0000255"}]},{"type":"Transmembrane","location":{"start":{"value":94,"modifier":"EXACT"},"end":{"value":114,"modifier":"EXACT"}},"description":"Helical","evidences":[{"evidenceCode":"ECO:0000255"}]},{"type":"Transmembrane","location":{"start":{"value":148,"modifier":"EXACT"},"end":{"value":168,"modifier":"EXACT"}},"description":"Helical","evidences":[{"evidenceCode":"ECO:0000255"}]},{"type":"Transmembrane","location":{"start":{"value":196,"modifier":"EXACT"},"end":{"value":216,"modifier":"EXACT"}},"description":"Helical","evidences":[{"evidenceCode":"ECO:0000255"}]},{"type":"Site","location":{"start":{"value":80,"modifier":"EXACT"},"end":{"value":80,"modifier":"EXACT"}},"description":"Confers selective permeability to Ca(2+) ions","evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"32415068"}]},{"type":"Natural variant","location":{"start":{"value":15,"modifier":"EXACT"},"end":{"value":15,"modifier":"EXACT"}},"description":"in dbSNP:rs34947403","featureCrossReferences":[{"database":"dbSNP","id":"rs34947403"}],"featureId":"VAR_053543","alternativeSequence":{"originalSequence":"A","alternativeSequences":["P"]}},{"type":"Mutagenesis","location":{"start":{"value":80,"modifier":"EXACT"},"end":{"value":80,"modifier":"EXACT"}},"description":"Has dominant negative effect. 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