Localization of a novel 252-kDa plasma membrane protein that binds Cry1A toxins in the midgut epithelia of Bombyx mori
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概要
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We previously demonstrated that a novel 252-kDa protein (P252) isolated from brush border membranes (BBM) of Bombyx mori, hybrid Shurei×Shogetsu, specifically bound Cry1Aa, Cry1Ab and Cry1Ac toxins with a K_d of 29, 179 and 20 nM, respectively. P252 was found in a Triton X-100-soluble fraction of BBM from first, third and fifth instar larvae, suggesting that it may be an important element of midgut epithelial cell membranes. P252 was not partitioned into a Triton X-100-insoluble BBM fraction and nearly identical partitioning of P252 was observed using detergents CHAPS and Igepal. These results suggested that P252 localized in non-raft regions of BBM. Immunofluorescence analysis using anti-P252 antiserum demonstrated the existence of P252 in BBMV. Cy3-labeled Cry1Aa, Cry1Ab and Cry1Ac were shown to bind to BBMV, and the addition of anti-P252 antiserum reduced the number of BBMV showing Cy3 fluorescence by 30%. This clearly suggested an important role for P252 in Cry1A binding to BBMV. CD spectra of a mixture of purified P252 with either Cry1Aa, Cry1Ab or Cry1Ac were compared with those of respective free Cry1A toxins and only one of the mixtures (Cry1Aa/P252) was shown to be significantly changed compared to that of native Cry1Aa.
- 2005-02-25
著者
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HOSSAIN Delwer
Applied Bioscience Laboratories, Graduate School of Science and Technology, Niigata University
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SHITOMI Yasuyuki
Applied Bioscience Laboratories, Graduate School of Science and Technology, Niigata University
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NANJO Yohei
Applied Bioscience Laboratories, Graduate School of Science and Technology, Niigata University
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TAKANO Daisuke
Applied Bioscience Laboratories, Graduate School of Science and Technology, Niigata University
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NISHIUMI Tadayuki
Applied Bioscience Laboratories, Graduate School of Science and Technology, Niigata University
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HAYAKAWA Tohru
Applied Bioscience Laboratories, Graduate School of Science and Technology, Niigata University
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MITSUI Toshiaki
Applied Bioscience Laboratories, Graduate School of Science and Technology, Niigata University
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SATO Ryoichi
Graduate School of Bio-Application and Systems Engineering, Tokyo University of Agriculture and Tech
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HORI Hidetaka
Applied Bioscience Laboratories, Graduate School of Science and Technology, Niigata University
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Hori Hidetaka
Graduate School of Science and Technology, Niigata University
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Mitsui Toshiaki
Graduate School of Science and Technology, Niigata University
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Hori H
Graduate School Of Sci. And Technol. Niigata Univ.
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Hori Hidetaka
Laboratories Of Molecular Life Sciences Graduate School Of Natural Science And Technology Niigata Un
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Hori Hidetaka
Graduate School Of Natural Science And Technology Niigata University
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Hossain Delwer
Laboratory Of Applied Biotechnology Graduate School Of Science And Technology Niigata University
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Takano Daisuke
School Of Pharmaceutical Sciences Kitasato University
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Takano Daisuke
Applied Bioscience Laboratories Graduate School Of Science And Technology Niigata University
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Nanjo Yohei
Graduate School Of Sci. And Technol. Niigata Univ.
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Hayakawa Tohru
Nihon Univ. School Of Dentistry At Matsudo Chiba Jpn
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Hayakawa Tohru
Nihon Univ. Graduate School Of Dentistry At Matsudo Chiba Jpn
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Hayakawa Tohru
Department Of Appilied Biology Faculty Of Textile Science Kyoto Institute Of Technology
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Hayakawa Tohru
Laboratory Of Applied Biotechnology Graduate School Of Science And Technology Niigata University
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SHITOMI Yasuyuki
Laboratory of Applied Biotechnology, Graduate School of Science and Technology, Niigata University
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Mitsui T
Graduate School Of Science And Technology Niigata University
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Mitsui Toshiaki
Laboratories Of Molecular Life Science Graduate School Of Science And Technology Niigata University
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Mitsui Toshiaki
Graduate School Of Natural Science And Technology Niigata University
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Shitomi Yasuyuki
Laboratory Of Applied Biotechnology Graduate School Of Science And Technology Niigata University
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Nishiumi Tadayuki
Applied Bioscience Laboratories Graduate School Of Science And Technology Niigata University
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Hayakawa T
Department Of Dental Materials Research Institute Of Oral Science Nihon University School Of Dentist
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Sato Ryoichi
Laboratory Of Molecular Mechanism Of Bio-interaction Graduate School Of Bio-application And Systems
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Mitsui Toshiaki
Laboratories Of Plant And Mircobial Genome Control Graduate School Of Science And Technology Niigata
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Hori Hidetaka
Laboratories Of Plant And Mircobial Genome Control Graduate School Of Science And Technology Niigata
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