CD127/IL-7RA Protein, Human (I66T, V138I, HEK293, Fc)

IL-7RA (also known as CD127) is a type 1 membrane glycoprotein folded to bind and mediate the action of IL7 and other alpha helical cytokines. IL-7RA is mainly expressed by cells of the lymphoid lineage. IL-7RA also acts as a receptor for thymic stromal lymphopoietin (TSLP). CD127/IL-7RA Protein, Human (I66T, V138I, HEK293, Fc) is produced in HEK293 cells with a C-Terminal Fc-tag.^[1][2].

IL-7R α-chain (IL-7RA; also known as CD127) is a type 1 membrane glycoprotein folded to bind and mediate the action of IL-7 and other alpha helical cytokines. IL-7RA is almost exclusively expressed by cells of the lymphoid lineage that plays an important role in lymphocyte differentiation, proliferation, and survival.  IL-7RA gene is localised on chromosome 5p13.3^[1][2].
The amino acid sequence of human IL-7RA protein has low homology between mouse and rat IL-7RA protein. While, human IL-7RA shares 97% aa sequence identity with monkey IL-7RA protein.
IL-7 is classified as a type 1 short-chain cytokine of the hematopoietin family. Physiologic roles of IL-7 involve modulation of T- and B-cell development and T-cell homeostasis. To perform all pleiotropic functions of IL-7 in immune system, IL-7 binds through a transmembrane receptor, which is formed by heterodimerizing of the common cytokine gamma chain (γc; also known as CD132) and IL-7RA. IL-7RA consists of an extracellular domain, transmembrane region and cytoplasmic tail, that recruits kinases for signal transduction. IL-7RA is organized in eight exons, spanning 18 kb of genomic DNA. The protein has a folding typical for the insertion of a helical cytokine, and it is composed of an intracellular domain (195 aa), a transmembrane domain (25 aa), and an extracellular region (220 aa). The latter shares homology with other members of the type I family of cytokine receptors. Close to the transmembrane domain, the extracellular region of IL-7Ra contains a Trp-Ser-X-Trp-Ser (WSXWS) motif involved in proper folding of the protein. Finally, the extracellular region also contains two fibronectin type III-like domains. Soluble or membrane-bound isoforms of IL-7RA are produced according to the alternative splicing of exon 6 in IL7RA gene. IL-7RA also acts as a receptor for thymic stromal lymphopoietin (TSLP)^[1][2][3].
IL-7RA associates with γc to form the functional high affinity IL-7 receptor complex. The natural killer T cells require signals from IL-7RA for their development. The common characteristic of all types of severe combined immunodeficiency (SCID) is absence of T-cell-mediated cellular immunity due to a defect in T-cell development. Defects in IL-7RA may be associated with SCID. Meanwhile, single nucleotide polymorphisms in IL7RA gene are involved in the dysregulation of immune homeostasis and susceptibility to multiple sclerosis (MS). IL-7RA is a receptor for TSLP. TSLP indirectly regulates T cell development by modulating dendritic cell activation^[1][3].

Soluble human IL-7RA (.1 μg/mL, 1 μg/mL, and 1 μg/mL; 3 days) reduces IL-7-mediated proliferation and production of IFN-γ of peripheral blood mononuclear cells (PBMCs)^[4].

Human

HEK293

C-hFc

P16871-1 (E21-G236, I66T, V138I)

3575  [NCBI]

Approximately 51.6 kDa.

Greater than 95% as determined by reducing SDS-PAGE.

<1 EU/μg, determined by LAL method.

• [1]. Daniel Čierny, et al. Genetic variants in interleukin 7 receptor α chain (IL-7Ra) are associated with multiple sclerosis risk and disability progression in Central European Slovak population. J Neuroimmunol. 2015 May 15;282:80-4.  [Content Brief]

  [2]. Renata Mazzucchelli, et al. Interleukin-7 receptor expression: intelligent design. Nat Rev Immunol. 2007 Feb;7(2):144-54.  [Content Brief]

  [3]. Silvia Giliani, et al. Interleukin-7 receptor alpha (IL-7Ralpha) deficiency: cellular and molecular bases. Analysis of clinical, immunological, and molecular features in 16 novel patients. Immunol Rev. 2005 Feb;203:110-26.  [Content Brief]

  [4]. Sarita A Y Hartgring, et al. Elevated expression of interleukin-7 receptor in inflamed joints mediates interleukin-7-induced immune activation in rheumatoid arthritis. Arthritis Rheum. 2009 Sep;60(9):2595-605.  [Content Brief]