Recombinant Mouse Neurturin Protein

Neurturin is a member of the GDNF family of ligands, which include glial cell-derived neurotrophic factor (GDNF), Neurturin, Persephin, and Artemin. GDNF family proteins are distant members of the Transforming Growth Factor beta (TGF-beta ) superfamily (1-4). Similar to other TGF-beta family proteins, Neurturin is synthesized as a precursor protein that is cleaved at the dibasic cleavage site (RXXR) to release the carboxy-terminal domain. The carboxy-terminal domain of Neurturin contains the characteristic seven conserved cysteine residues necessary for the formation of the cysteine knot and the single interchain disulfide bond. Biologically active Neurturin is a disulfide-linked homodimer of the carboxy-terminal 100 amino acid residues. Mature mouse Neurturin shares 91% amino acid sequence similarity with human Neurturin. Mature Neurturin also shares about 40% similarities with the other three members of the GDNF family ligands (2, 5). Unlike other members of TGF-beta family, bioactivities of all GDNF family ligands are mediated through a unique multicomponent receptor complex composed of high affinity ligand binding component (GFR alpha -1-GFR alpha -4) and a common signaling component (cRET receptor tyrosine kinase). Each member of the GDNF family ligands has its preferred binding protein. Neurturin preferentially binds to GFR alpha -2 but can also bind GFR alpha -1 at higher concentration (5-8). Neurturin has been shown to promote the survival of a variety of neurons including sympathetic, sensory, and central nervous system neurons. Neurturin is expressed in both neuronal and non-neuronal tissues. It may play a role in regulating the development and maintenance of the central and peripheral nervous systems as well as non-neuronal systems (9).