Structure of divalent cation-phosphatidic acid complexes as determined by 31P-NMR.

Structure of divalent cation-phosphatidic acid complexes as determined by 31P-NMR.
复制标题

通过 31 P-NMR 测定的二价阳离子-磷脂酸复合物的结构。

DOI:
10.1016/0005-2736(84)90296-7
复制
发表时间:
1984
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Prestegard,JH
Prestegard,JH
中科院分区:
--
文献类型:
--
作者:
Miner,VW;Prestegard,JH

文献摘要

参考文献

被引文献

相似文献

用~(31)P固体核磁共振方法对磷脂酸-二价阳离子复合物的结构进行了比较研究。这些复合物被认为是磷脂囊泡融合过程中的重要中间体,有证据表明,各种离子活性的差异可能源于复合物之间的结构差异。固体核磁共振研究使用自旋二分之一核通过化学位移张量的部分平均来反映分子的结构性质。我们已经发现显着差异的化学位移张量观察镁,钙和镉络合物。低角度X射线散射数据用于确保相似相的比较。在低温下,钙和镉配合物表现出独特的阶段,禁止比较与镁配合物。在较高的温度下,所有的复合物表现出六方相,和31 P张量的复合物在六方相可以解释使用头基的几何形状类似于那些发现在磷脂的晶体结构,并假设运动平均由简单的轴向运动。钙和镉络合物的张量是非常相似的,但显着更广泛的比观察到的镁络合物表明更直立的头基结构。的差异平行的钙和镉的离子的融合活动是相似的,并显着增强了镁,支持融合活动的结构链接。
A comparative study of the structure of various phosphatidic acid-divalent cation complexes has been completed using31P solids NMR methods. These complexes had been implicated as important intermediates in the fusion of phospholipid vesicles and several pieces of evidence had suggested that differences in activity of various ions may stem from structural differences among the complexes. Solids NMR studies using spin one-half nuclei reflect structural properties of molecules through partial averaging of chemical shift tensors. We have found significant differences in the chemical shift tensors observed for Mg, Ca and Cd complexes. Low angle X-ray scattering data were used to assure comparison of similar phases. At low temperatures Ca and Cd complexes exhibit unique phases prohibiting comparison with Mg complexes. At higher temperatures, all complexes exhibit a hexagonal phase, and31P tensors of the complexes in the hexagonal phase can be interpreted using headgroup geometries similar to those found in crystal structures of phospholipids and assuming motional averaging by simple axial motions. Tensors of Ca and Cd complexes are very similar to one another but are significantly broader than those observed for Mg complexes suggesting a more erect headgroup structure. The differences parallel the fusion activities of the ions for which Ca and Cd are similar and significantly enhanced over that of Mg, supporting a structural link to fusion activity.
DOI: --
发表时间: 1981
期刊: Biochimica et Biophysica Acta
影响因子: --
作者:
R. Van Venetie;A. Verkleij
通讯作者: A. Verkleij
DOI: 10.1021/bi00257a036
发表时间: 1982
期刊: Biochemistry
影响因子: 2.9
作者:
Wittebort,RJ;Blume,A;Huang,TH;DasGupta,SK;Griffin,RG
通讯作者: Griffin,RG
DOI: 10.1021/bi00514a022
发表时间: 1981-05
期刊: Biochemistry
影响因子: 2.9
作者:
J. Wilschut;N. Düzgüneş;D. Papahadjopoulos
通讯作者: J. Wilschut;N. Düzgüneş;D. Papahadjopoulos
DOI: 10.1016/0005-2736(77)90275-9
发表时间: 1977-01-01
期刊: BIOCHIMICA ET BIOPHYSICA ACTA
影响因子: --
作者:
PAPAHADJOPOULOS, D;VAIL, WJ;LAZO, R
通讯作者: LAZO, R
磷脂酸-磷脂酰胆碱混合脂质囊泡融合中的离子特异性。
DOI: 10.1016/0005-2736(80)90549-0
发表时间: 1980
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Liao,MJ;Prestegard,JH
通讯作者: Prestegard,JH