Functional and structural characterization of factor Xa dimer in solution.

Functional and structural characterization of factor Xa dimer in solution.
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溶液中因子 Xa 二聚体的功能和结构表征。

DOI:
10.1016/j.bpj.2008.10.013
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发表时间:
2009
影响因子:
3.4
通讯作者:
Lentz,BarryR
Lentz,BarryR
中科院分区:
生物学3区
文献类型:
--
作者:
Chattopadhyay,Rima;Iacob,Roxana;Sen,Shalmali;Majumder,Rinku;Tomer,KennethB;Lentz,BarryR

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先前的研究表明,水溶性磷脂酰丝氨酸(C6 PS)与牛凝血因子Xa(FXa)的结合导致溶液中钙离子依赖性二聚化。我们报告的Ca 2+,C6 PS,和二聚化对人和牛FXa的活性和结构的影响。人和牛的二聚体对凝血酶原的活性比单体低106- 107倍,这种降低主要归因于inkcat的大幅降低。二聚化似乎不阻断活性位点,因为对合成底物的酰胺分解活性基本上不受影响。圆二色性揭示了二聚化后三级或四级结构的实质性变化,伴随着α-螺旋的减少。质谱鉴定了催化结构域中的赖氨酸(K270),其似乎被埋在二聚体界面处,并且是据报道干扰因子Va(FVa)结合的合成肽序列的一部分。C6 PS结合暴露K351(报道的FVa结合区的一部分)、K242(邻近催化三联体)和K420(底物外位点的一部分)。我们将我们的结果解释为意味着C6 PS诱导的二聚化产生实质性的构象变化或结构域重排,使得需要PS激活的FXa的结构数据来理解FXa二聚体或FXa-FVa复合物的结构。
Previous studies showed that binding of water-soluble phosphatidylserine (C6PS) to bovine factor Xa (FXa) leads to Ca2+-dependent dimerization in solution. We report the effects of Ca2+, C6PS, and dimerization on the activity and structure of human and bovine FXa. Both human and bovine dimers are 106- to 107-fold less active toward prothrombin than the monomer, with the decrease being attributed mainly to a substantial decrease inkcat. Dimerization appears not to block the active site, since amidolytic activity toward a synthetic substrate is largely unaffected. Circular dichroism reveals a substantial change in tertiary or quaternary structure with a concomitant decrease inα-helix upon dimerization. Mass spectrometry identifies a lysine (K270) in the catalytic domain that appears to be buried at the dimer interface and is part of a synthetic peptide sequence reported to interfere with factor Va (FVa) binding. C6PS binding exposes K351(part of a reported FVa binding region), K242(adjacent to the catalytic triad), and K420(part of a substrate exosite). We interpret our results to mean that C6PS-induced dimerization produces substantial conformational changes or domain rearrangements such that structural data on PS-activated FXa is required to understand the structure of the FXa dimer or the FXa-FVa complex.
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