Comparison of a major heat-stable microtubule-associated protein in HeLa cells and 190-kDa microtubule-associated protein in bovine adrenal cortex.
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概要
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A heat-stable microtubule-associated protein (MAP) with a molecular weight of 190, 000, termed 190-kDa MAP, has been purified from bovine adrenal cortex (Murofushi, H. et al. (1986) J. Cell Biol. 103, 1911-1919). Immunoblotting experiments using an antibody against this MAP revealed that several kinds of culture cells derived from human tissues contain proteins with an apparent molecular weight of 180, 000 reacting with the antibody. Indirect immunofluorescence microscopic observation of HeLa cells showed that the immunoreactive protein co-exists with microtubules, indicating that the protein is one of the HeLa MAPs. A heat-stable MAP with a molecular weight of 180, 000, termed here HeLa 180-kDa MAP, was purified by the taxol-dependent procedure (Vallee, R. B. (1982) J. Cell Biol. 92, 435-442) and successive co-polymerization with brain tubulin. This protein was the most abundant MAP in HeLa cells, suggesting that the MAP is identical to the major HeLa MAP previously reported by Bulinski and Borisy (Bulinski, J. C. & Borisy, G. G. (1980) J. Biol. Chem. 255, 11570-11576) and Weatherbee et al. ((1980) Biochemistry 19, 4116-4123). It was shown that, like bovine adrenal 190-kDa MAP, yet distinct from brain MAP2 and tau, purified HeLa 180-kDa MAP does not interact with actin filaments. This common characteristic of the two MAPs along with the same heat-stability strongly suggests that they are members of the same group of MAPs. The fact that HeLa 180-kDa MAP reacts with an antibody against bovine adrenal 190-kDa MAP means that they share common epitopes, in other words, common local amino acid sequences. However, the limited proteolytic patterns of the two MAPs with S. aureus V8 protease and chymotrypsin were distinct from each other, suggesting the presence of large differences in the overall primary structures between bovine adrenal 190-kDa MAP and HeLa 180-kDa MAP.
- 社団法人 日本生化学会の論文
著者
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Maekawa Shohei
Department Of Applied Biology Kyoto Institute Of Technology
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Murofushi Hiromu
Department Of Biochemistry And Biophysics Faculty Of Science
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Kotani Susumu
Department Of Biochemical Engineering And Science Faculty Of Computer Science And Systems Engineerin
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Aizawa Hiroyuki
Department Of Cell Biology The Tokyo Metropolitan Institute Of Medical Science
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Sakai Hikoichi
Department Of Biophysics And Biochemistry Faculty Of Science The University Of Tokyo
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