Abstract

S100β is a neurite extension factor and has been implicated in Alzheimer's disease and Down's syndrome. It belongs to a group of low molecular weight calcium-binding proteins containing the helix-loop-helix calcium binding motif. The structure of only one S100 protein, calbindin D 9k, which has the lowest sequence similarity to the other members of the S100 group has been determined. We report the NMR assignments and secondary structure of calcium-free S100β. The secondary structure is similar to that of calbindin D 9k, determined using NMR, except that there is clear evidence for an additional well ordered 5-residue α-helix in S100β.

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