Lipid environments in the yolk lipoprotein system. A spin-labeling study of the lipovitellin/phosvitin complex from Xenopus laevis.
Lipid environments in the yolk lipoprotein system. A spin-labeling study of the lipovitellin/phosvitin complex from Xenopus laevis.
复制标题
卵黄脂蛋白系统中的脂质环境。
DOI:
10.1021/bi00539a025
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发表时间:
1982
期刊:
影响因子:
2.9
通讯作者:
Seelig,J
中科院分区:
文献类型:
--
作者:
Birrell,GB;Anderson,PB;Jost,PC;Griffith,OH;Banaszak,LJ;Seelig,J
G. Bruce Birrell, Philip B. Anderson, Patricia C. Jost,* O. Hayes Griffith, Leonard J. Banaszak, and Joachim Seelig abstract: Lipid/protein and lipid/lipid interactions in the yolk lipoprotein complex from Xenopus laevis were examined by introducing a series of lipid spin-labels into the complex and observing the electron spin resonance spectra as a function of the position of the label along the lipid chains, temperature, pH, and charge on the lipid polar head group. Analyses of the spectra show that, in addition to the expected component arising fromlipid associated with protein, a second component with increased segmental flexibility and the greater temperature dependence characteristic of lipid/lipid interactions is observed. These spin-labeling data and supporting composi-tional data indicate that much of the lipid is organized into a lipid-rich region or pool, consistent with the earlier model derived from electron microscopy and diffraction data and with companion 31P and 2H nuclear magnetic resonance data re-ported in the preceding paper [Banaszak, L. J., & Seelig, J.(1982) Biochemistry (preceding paper in this issue)]. The bilayer-like component exhibits a greater restriction of motion compared to vesicles of the isolated lipids at the same tem-perature, as would be expected for a relatively small lipid pool. Phospholipids exchange between the two motionally distin-guishable environments. The equilibrium binding undergoes a shift between these two environments as a function both of pH and of the charge on the phospholipid polar head group. This shift in average binding affinity is opposite in direction to that reported for membrane proteins and implicates nega-tively charged groups on the protein that repel negatively charged phospholipids. This effect is greatly reduced by alkaline phosphatase treatment, suggesting that some of the lipid binding sites are in close proximity to phosphorylated residues on the protein.
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影响因子:
5.6
作者:
R. Fenna;B. Matthews;J. Olson;E. K. Shaw
通讯作者:
E. K. Shaw
DOI:
--
发表时间:
1978
期刊:
Biochimica et Biophysica Acta
影响因子:
--
作者:
K. Machida;S. Ohnishi
通讯作者:
S. Ohnishi
影响因子:
5.6
作者:
S. Fuller;R. Capaldi;R. Henderson
通讯作者:
R. Henderson
影响因子:
2.9
作者:
P. Jost;K. Nadakavukaren;O. Griffith
通讯作者:
O. Griffith
影响因子:
5.6
作者:
D. Ohlendorf;M. L. Collins;E. Puronen;L. Banaszak
通讯作者:
L. Banaszak