Recombinant Mouse TNFSF9/4-1BB

Tumor necrosis factor ligand superfamily member 9, also known as 4-1BBL, is a member of the the tumornecrosis factor family. Mouse 4-1BBL cDNA encodes a 309 amino acid residues (aa) protein with an 82 aa N-terminal cytoplasmic domain, a 21 aa transmembrane domain and a 206 aa C-terminal extracellular domain.The extracellular domain of 4-1BBL has a tertiary structure similar to that of other TNFSF members, but sharesonly low aa sequence homology (14-16%). 4-1BBL is predominantly expressed on activated antigen presentingcells (APCs) such as B cells, macrophages and dendritic cells (DCs). It is also expressed on most T and Blymphoma cell lines. TNFSF9 has been shown to reactivate anergic T lymphocytes in addition to promoting Tlymphocyte proliferation. This cytokine has also been shown to be required for the optimal CD8 responses inCD8 T cells, and is thought to be involved in T cell-tumor cell interaction.