Recombinant Human TMIGD2/CD28H His-tag Protein, CF Summary
B7-H7/HHLA2 Fc Chimera (Catalog # 8084-B7) that produces 50% of the optimal binding response is approximately 0.2-1 μg/mL.
Leu23-Gly150, with a C-terminal 6-His tag
CD28 homolog (CD28H), also called TMIG2 and IGPR-1, is a 55 kDa glycosylated transmembrane protein that shares approximately 10% amino acid (aa) sequence identity with CD28, CTLA-4, ICOS, and PD-1. CD28H is composed of a single extracellular immunoglobulin variable-like domain (IgV) (aa 23-109), a transmembrane domain (aa 151-171), and a long cytoplasmic domain (aa172-282). CD28H is constitutively expressed on naive T and NK cells. Similar to the interaction of B7 with CD28, the interaction of CD28H with B7-H7 activates the Akt-dependent signaling cascade and promotes the proliferation and activation of newly generated peripheral effector and memory T cells (1, 2). CD28H is additionally expressed in the skin and epithelium lining the lung, airway, mammary gland, and gastrointestinal tract (3). It regulates cellular morphology, focal adhesion contact formation, and cell migration (3, 4). CD28H also participates in angiogenesis in vitro (3). CD28H interacts with multiple cytoskeletal proteins including Actin, Paxillin, SPIN90, CACNB2, and BPAG1. Interactions between the cytoplasmic proline-rich domain of CD28H and SPIN90 modulate the activity of CD28H in both angiogenesis and cell adhesion (3, 5).
- Zhu, Y. et al. (2013) Nat. Commun. 4:2043.
- Parry, R.V. et al. (2003) J.Immunol. 171:166.
- Rahimi, N. et al. (2012) Mol. Biol. Cell. 23:1646.
- Huang, C. et al. (2003) Nature 424:219.
- Kaneko, T. et al. (2008) Front. Biosci. 13:4938.
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