NGF is purified in three forms: the 7S, 2.5S and β. The 7S, 130 kDa, form occurs naturally in mouse submaxillary glands, and is a multimeric protein composed of two α, one β and two γ subunits. The name is derived from its sedimentation co-efficient, 7S. The biologically active subunit is the β, which is a 26 kDa dimer composed of two identical 120 amino acid chains held together by hydrophobic interactions. The a chain stabilizes the 7S complex and binds two zinc ions per 7S complex as cofactor at the β-γ interface. The γ chain is an arginine specific protease, it may also have plasminongen activator activity as well as mitogenic activity for chick embryo fibroblasts. The 2.5S form is 9 amino acids shorter than the β form, because of proteolysis that occurs during the purification process.
产品描述
Native Mouse Nerve Growth Factor 7S
产品形式
The neurotrophins ("neuro" means nerve and "trophe" means nutrient) are a family of soluble, basic growth factors which regulate neuronal development, maintenance, survival and death in the CNS and the PNS. NGF, the first member of the family to be discovered, was originally purified as a factor able to support survival of sympathetic and sensory spinal neurons in culture. It is synthesized and secreted by sympathetic and sensory target organs and provides trophic support to neurons as they reach their final target. Neurotrophin secretion increases in the nervous system following injury. Schwann cells, fibroblasts, and activated mast cells normally synthesize NGF constitutively, however direct trauma and induction of cytokines combine to increase neurotrophin production in these cells after injury.