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J. Biol. Chem., Vol. 263, Issue 16, 7703-7707, Jun, 1988

Microtubule-binding domain of tau proteins

H Aizawa, H Kawasaki, H Murofushi, S Kotani, K Suzuki and H Sakai
Department of Biophysics and Biochemistry, Faculty of Science, University of Tokyo, Japan.

Limited chymotryptic digestion of whole tau proteins produced a fragment of Mr 14,000 (CT14), which was able to bind to microtubules reconstituted from tubulin alone in the presence of taxol. This fragment was also found to persist in microtubules when microtubules consisting of tau proteins and tubulin were digested by chymotrypsin. Analysis of amino acid composition revealed that CT14 was rich in lysine and proline residues, suggesting unique structure of microtubule- binding domain of tau proteins. Amino-terminal sequence of CT14 was determined to be Ser-Ser-Pro-Gly-Ser-Pro-Gly-Thr-Pro-Gly-Ser-Arg-Ser- Arg-X-Pro-Ser-Leu-Pr o. No heterogeneity was detected in this amino- terminal sequence of 19 residues. Five species of polypeptides consisting of tau proteins were separated from each other by gel electrophoresis and subjected to chymotryptic digestion. CT14 was produced from each of the tau polypeptides by chymotryptic digestion, indicating that all tau polypeptides have a common microtubule-binding domain.
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