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Volume 325, Issue 3 p. 167-172
Research letters
Free Access

Glycogen synthase kinase 3β is identical to tau protein kinase I generating several epitopes of paired helical filaments

Koichi Ishiguro

Koichi Ishiguro

Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machidashi, Tokyo 194, Japan

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Akiko Shiratsuchi

Akiko Shiratsuchi

Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machidashi, Tokyo 194, Japan

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Showbu Sato

Showbu Sato

Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machidashi, Tokyo 194, Japan

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Akira Omori

Akira Omori

Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machidashi, Tokyo 194, Japan

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Manabu Arioka

Manabu Arioka

Department of Agricultural Chemistry, University of Tokyo, Bunkyoku, Tokyo 113, Japan

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Shunsuke Kobayashi

Shunsuke Kobayashi

College of Pharmacy, Nihon University, Narashinodai, Funabashishi, Chiba 274, Japan

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Tsuneko Uchida

Tsuneko Uchida

Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machidashi, Tokyo 194, Japan

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Kazutomo Imahori

Kazutomo Imahori

Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machidashi, Tokyo 194, Japan

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First published: July 05, 1993
Citations: 321
Correspondence address: K. Ishiguro, Mitsubishi Kasei Institute of Life Sciences, 11 Minamiooya, Machidashi, Tokyo 194, Japan. Fax: (81) (427) 291 259.

Abstract

We previously reported that tau protein kinase I (TPKI) induced normal tau protein into a state of paired helical filaments (PHF); this is further confirmed here by immunoblot analysis using several antibodies. We also present the amino acid sequence of TPKI, which is identical to glycogen synthase kinase 3β (GSK3β). Moreover, we found that TPKI activity was inseparable from GSK3 activity throughout the purification procedure. These results indicate that TPKI is identical to GSK3β.