The pro-neurotrophin (pro-NGF: 27 kDa) spontaneously forms stable, non-covalent dimers directly in the ER. The homodimer is associated by noncovalent forces, with an equilibrium dissociation constant of 10 pM. The neurotrophin pro- domain is important for proper folding and intracellular sorting. Heterodimers of different neurotrophin monomers can also be generated at the ER.
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