The interleukin 2 (IL2) receptor alpha (IL2RA) and beta (IL2RB) chains , together with the common gamma chain (IL2RG) , constitute the high-affinity IL2 receptor. Homodimeric alpha chains (IL2RA) result in low-affinity receptor , while homodimeric beta (IL2RB) chains produce a medium-affinity receptor. Normally an integral-membrane protein , soluble IL2RA has been isolated and determined to result from extracellular proteolyisis. Alternately-spliced IL2RA mRNAs have been isolated , but the significance of each is presently unknown. Mutations in this gene are associated with interleukin 2 receptor alpha deficiency.[provided by RefSeq , Nov 2009] ,
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