beta(2)-glycoprotein I-dependent alterations in membrane properties.

beta(2)-glycoprotein I-dependent alterations in membrane properties.
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β(2)-糖蛋白 I 依赖性膜特性改变。

DOI:
10.1016/s0005-2736(00)00329-1
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发表时间:
2000
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Schroit,AJ
Schroit,AJ
中科院分区:
--
文献类型:
--
作者:
Lee,AT;Balasubramanian,K;Schroit,AJ

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β2-糖蛋白I(β 2-Glycoprotein I,β 2GP 1)是一种50 kDa的血清糖蛋白,与阴离子磷脂结合,在磷脂酰丝氨酸(phosphatidylserine,PS)依赖的凝血和凋亡过程中发挥作用。为了表征β 2GP 1结合后靶膜发生的分子后果,通过荧光光谱研究了β 2GP 1与含PS囊泡之间的相互作用。含有芘标记的脂质的膜显示,β 2GP 1的结合引起靶膜的激基缔合物/单体比率(E/M)降低。虽然这些膜改变发生在等渗缓冲液中,但在低离子强度缓冲液中的影响更大,并且与膜沉淀一致。相反,膜极化的增加仅见于低离子强度缓冲液中。通过荧光素标记的β 2GP 1和含有罗丹明的PS囊泡之间的共振能量转移对β 2GP 1结合动力学进行分析,揭示了一个双组分过程:(1)通过C末端的初级快速结合,在等渗和低离子强度缓冲液中均发生<2 s,和(2)N末端的顺序结合,在低离子强度溶液中慢了0.100倍。综上所述,这些数据表明β 2GP 1改变了其靶膜的流动性和膜极化,在低离子强度缓冲液中,这足以诱导沉淀。
β2-Glycoprotein I (β2GP1), a 50 kDa serum glycoprotein, binds anionic phospholipids and plays a role in phosphatidylserine (PS)-dependent coagulation and apoptotic processes. To characterize the molecular consequences that occur to target membranes upon binding of β2GP1, the interaction between β2GP1 and PS-containing vesicles was investigated by fluorescent spectroscopy. Membranes containing pyrene-labeled lipid showed that binding of β2GP1 induced a decrease in excimer/monomor ratios (E/M) of the target membrane. Although these membrane alterations occurred in isotonic buffer, the effects were greater in low ionic strength buffer and were coincident to membrane precipitation. In contrast, increases in membrane polarization were only seen in low ionic strength buffer. Analysis of β2GP1 binding kinetics by resonance energy transfer between fluorescein-labeled β2GP1 and rhodamine-containing PS vesicles revealed a two-component process: (1) a primary and rapid binding via the C-terminus that occurred <2 s in both isotonic and low ionic strength buffers, and (2) a sequential binding of the N-terminus that was ∼100-fold slower in low ionic strength solution. Taken together, these data suggest that β2GP1 alters the fluidity and membrane polarization of its target membrane, which in low ionic strength buffer is of sufficient magnitude to induce precipitation.
人 β2-糖蛋白 I 重组第五结构域的结构和功能:Lys77 和 Thr78 之间特异性切割的影响。
DOI: --
发表时间: 1997
期刊: Journal of Biochemistry (Tokyo)
影响因子: --
作者:
Y. Hagihara;K. Enjyoji;T. Omasa;Y. Katakura;K. Suga;M. Igarashi;E. Matsuura;H. Kato;T. Yoshimura;Y. Goto
通讯作者: Y. Goto
DOI: --
发表时间: 1997
影响因子: 5.2
作者:
Y. Sheng;S. Krilis;A. Sali
通讯作者: A. Sali
辅因子依赖性和辅因子非依赖性抗心磷脂抗体。
DOI: --
发表时间: 1991
影响因子: 7.5
作者:
LW Chamley;E. McKay;NS Pattison
通讯作者: NS Pattison
感染性和自身免疫性抗磷脂抗体与心磷脂脂质体结合所需的相反 β2-糖蛋白 I 要求与抗体亲和力相关。
DOI: --
发表时间: 1999
期刊: Biochimica et Biophysica Acta
影响因子: --
作者:
C. M. Celli;A. Gharavi;H. Chaimovich
通讯作者: H. Chaimovich
DOI: 10.1016/0003-2697(88)90159-5
发表时间: 1988-08-15
影响因子: 2.9
作者:
DERBALIAN, GP;KAMEDA, N;ROWLEY, GL
通讯作者: ROWLEY, GL