Functional and structural characterization of factor Xa dimer in solution.
Functional and structural characterization of factor Xa dimer in solution.
复制标题
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
中科院分区:
文献类型:
--
作者:
Chattopadhyay,Rima;Iacob,Roxana;Sen,Shalmali;Majumder,Rinku;Tomer,KennethB;Lentz,BarryR
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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影响因子:
2.9
作者:
D. Monnaie;D. Arosio;N. Griffon;T. Rose;A. Rezaie;E. Di Cera
通讯作者:
E. Di Cera
DOI:
--
发表时间:
1974
期刊:
CRC Critical Reviews in Biochemistry
影响因子:
--
作者:
A. T. Phillips
通讯作者:
A. T. Phillips
DOI:
10.1016/s0021-9258(18)45150-2
发表时间:
1987-09
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
E. Husten;C. Esmon;A. Johnson
通讯作者:
E. Husten;C. Esmon;A. Johnson
影响因子:
20.3
作者:
Rinku Majumder;M. Quinn-Allen;W. Kane;B. Lentz
通讯作者:
Rinku Majumder;M. Quinn-Allen;W. Kane;B. Lentz
影响因子:
15.9
作者:
GRZESIAK, JJ;PIERSCHBACHER, MD
通讯作者:
PIERSCHBACHER, MD