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  1. 010 学術雑誌論文
  2. 桑島, 邦博 / KUWAJIMA, Kunihiro

Innocuous character of [ethylenebis(oxyethylenenitrilo)]tetraacetic acid and EDTA as metal-ion buffers in studying Ca2+ binding by alpha-lactalbumin

https://ir.soken.ac.jp/records/4131
https://ir.soken.ac.jp/records/4131
62f8ba90-2a9a-44d8-8c62-7d05d4ad9aa8
Item type 学術雑誌論文 / Journal Article(1)
公開日 2014-01-08
タイトル
タイトル Innocuous character of [ethylenebis(oxyethylenenitrilo)]tetraacetic acid and EDTA as metal-ion buffers in studying Ca2+ binding by alpha-lactalbumin
タイトル
タイトル Innocuous character of [ethylenebis(oxyethylenenitrilo)]tetraacetic acid and EDTA as metal-ion buffers in studying Ca2+ binding by alpha-lactalbumin
言語 en
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
資源タイプ journal article
アクセス権
アクセス権 metadata only access
アクセス権URI http://purl.org/coar/access_right/c_14cb
著者 MITANI, Masahiro

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MITANI, Masahiro

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HARUSHIMA, Yoshiaki

× HARUSHIMA, Yoshiaki

HARUSHIMA, Yoshiaki

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KUWAJIMA, Kunihiro

× KUWAJIMA, Kunihiro

KUWAJIMA, Kunihiro

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IKEGUCHI, Masamichi

× IKEGUCHI, Masamichi

IKEGUCHI, Masamichi

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SUGAI, Shintaro

× SUGAI, Shintaro

SUGAI, Shintaro

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著者別名 桑島, 邦博

× 桑島, 邦博

桑島, 邦博

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抄録
内容記述タイプ Abstract
内容記述 The binding of EGTA and EDTA to alpha-lactalbumin, first demonstrated by Kronman and Bratcher (Kronman, M. J., and Bratcher, S. C. (1983) J. Biol. Chem. 258, 5707-5709) and afterwards regarded as a significant source of error in estimating the binding constant of Ca2+ to the protein, has been investigated by comparison of the thermal unfolding curves of the protein in the absence and presence of the chelators and also by measuring the NMR spectra of the protein, the chelators, and the protein-chelator mixtures. The unfolding curve in the presence of a large excess of each chelator has been found to be identical to that in the absence of chelator, indicating that there is essentially no interaction between the chelators and alpha-lactalbumin. The NMR results have also supported this conclusion, and the innocuous character of these chelators as metal-ion buffers in studying the Ca2+-binding properties of alpha-lactalbumin is demonstrated. In order to re-examine the binding constant for Ca2+ of alpha-lactalbumin without the aid of chelating metal-ion buffers, the thermal unfolding curve of the protein in the presence of 0.1 mM excess Ca2+ but without chelators has been compared with the unfolding curve in the absence of Ca2+ at a constant concentration of Na+ (0.010 or 0.10 M) at pH 7.0. The binding constant of alpha-lactalbumin can be calculated from the increment of melting temperature caused by the presence of Ca2+ and from the enthalpy and heat capacity changes in the unfolding. Because Ca2+ binding to the unfolded protein can be neglected under the conditions employed, the binding constant evaluated corresponds to the binding constant to protein that has native structure. The constant obtained is 3-5 X 10(9) M-1 after corrections for binding of Na+ to the protein and for ionic strength, and this shows excellent agreement with the corresponding value previously estimated (2.9 +/- 1.0 X 10(9) M-1), although the latter value was obtained in the presence of EDTA. The apparent Ca2+-binding constant that has been discussed in most previous studies, without taking account of the folding-unfolding equilibrium associated with the binding process, also depends on the concentration of monovalent cations such as Na+, and the present results lead to values of 1.5 X 10(8) and 8.7 X 10(6) M-1 at 0.01 and 0.1 M Na+, respectively.
書誌情報 Journal of Biological Chemistry
en : Journal of Biological Chemistry

巻 261, 号 19, p. 8824-8829, 発行日 1986-07-05
出版者
出版者 American Society for Biochemistry and Molecular Biology
ISSN
収録物識別子タイプ ISSN
収録物識別子 0021-9258
PubMed番号
識別子タイプ PMID
関連識別子 3087980
権利
権利情報 © 2014 by American Society for Biochemistry and Molecular Biology
関連サイト
識別子タイプ URI
関連識別子 http://www.jbc.org/content/261/19/8824.short
関連名称 American Society for Biochemistry and Molecular Biology
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