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Purification and analysis of authentic CLIP-170 and recombinant fragments

Published inThe Journal of biological chemistry, vol. 274, no. 36, p. 25883-25891
Publication date1999-09-03
Abstract

We have purified authentic CLIP-170 (cytoplasmic linker protein of 170 kDa) and fragments comprising functional domains of the proteins to characterize the structural basis of the function of CLIP-170. Analysis of authentic CLIP-170 and the recombinant fragments by electron microscopy after glycerol spraying/low angle rotary metal shadowing reveals CLIP-170 as a thin, 135-nm-long molecule with two kinks in tis central rod domain, which are approximately equally spaced from the two ends of the protein. The central domain consisting of heptad repeats, which is α-helical in nature and forms a 2-stranded coiled-coil, mediates dimerization of CLIP-170. The rod domain harbors two kinks, each spaced ~37 nm from the corresponding end of the molecule, thus providing mechanical flexibility to the highly elongated melocule. The N-terminal domain of CLIP-170 binds to microtubules in vitro with a stoichiometry of one dimeric head domain per four tubulin heterodimers. Authentic CLIP-170 binds to microtubules with lower stoichiometry, indicating that the rod and tail domains affect microtubules binding of CLIP-170. These results document that CLIP-170 is a highly elongated polar molecule with the microtubule-binding domain and the organelle-interacting domains at opposite ends of the homodimer, thus providing a structural basis for the function of CLIP-170 as a microtubule-organelle linker protein.

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Citation (ISO format)
SCHEEL, Jochen Konrad et al. Purification and analysis of authentic CLIP-170 and recombinant fragments. In: The Journal of biological chemistry, 1999, vol. 274, n° 36, p. 25883–25891. doi: 10.1074/jbc.274.36.25883
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ISSN of the journal0021-9258
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