Mapping of the Discontinuous Kininogen Binding Site of Prekallikrein

Mapping of the Discontinuous Kininogen Binding Site of Prekallikrein
复制标题

前激肽释放酶的不连续激肽原结合位点图谱

DOI:
--
复制
发表时间:
1996
影响因子:
4.8
通讯作者:
W. Müller
W. Müller
中科院分区:
生物学2区
文献类型:
--
作者:
H. Herwald;T. Renné;J. Meijers;D. Chung;J. Page;R. Colman;W. Müller

文献摘要

参考文献

被引文献

相似文献

前激肽释放酶是丝氨酸蛋白酶激肽释放酶的前体,在血浆中与H激肽原形成等摩尔的复合体。与H-激肽原的结合是由激肽释放酶重链介导的,该重链由4个“苹果”结构域A1-A4组成,与H-激肽原结合具有很高的特异性和亲和力(Kd=83 nM)。激肽释放酶重链的至少两个截然不同的部分形成了这个H-激肽原结合位点:位于重链NH2-末端片段的近端片段(A1)和位于COOH-末端片段A2-A4的远端片段(S)。近端结合片段位于A1的56-86位氨基酸。为了准确定位远端结合片段,我们已经鉴定了针对COOH末端片段的单抗,它干扰H-激肽原-前激肽释放酶复合体的形成。单抗13G11与重组苹果区A4结合,但不与前激肽释放酶重链的A3区结合。A4结构域的缺失突变将13G11的目标表位缩小到A4结构域的中心部分,位置284-331。H-激肽原与不同的A4结构域的直接结合研究表明,H-激肽原远端结合部分位于48个残基上,与13G11表位重叠。因此,H-激肽原和前激肽释放酶的紧密相互作用是由至少两个独立的序列片段介导的,它们分别位于前激肽释放酶重链的A1和A4区域。分离的远端结合片段显着延长了重组Williams血浆的部分凝血活酶时间,从而强调了前激肽释放酶-H-激肽原复合体的形成在启动内源性凝血级联反应中的关键作用。
Prekallikrein, the precursor to the serine proteinase kallikrein, circulates in plasma in an equimolar complex with H-kininogen. The binding to H-kininogen is mediated by the kallikrein heavy chain consisting of four “apple” domains, A1-A4, which attaches to H-kininogen with high specificity and affinity (KD = 83 nM). At least two distinct portions of the kallikrein heavy chain form this H-kininogen binding site: a proximal segment located in the NH2-terminal fragment of the heavy chain encompassing A1, and distal segment(s) located in COOH-terminal fragment spanning domains A2-A4. The proximal binding segment has been located to amino acid positions 56-86 of A1. To precisely map the distal binding segment, we have identified monoclonal antibodies directed to the COOH-terminal fragment which interfere with the H-kininogen-prekallikrein complex formation. Monoclonal antibody 13G11 binds to recombinant apple domain A4 but not to domain A3 of the prekallikrein heavy chain. Deletion mutagenesis of domain A4 narrowed down the target epitope of 13G11 to the center portion of domain A4, positions 284-331. Direct binding studies of H-kininogen to various domain A4 constructs revealed that the distal H-kininogen binding portion is located on a segment of 48 residues, which overlaps the 13G11 epitope. Hence the tight interaction of H-kininogen and prekallikrein is mediated by at least two separate sequence segments located in domains A1 and A4, respectively, of the prekallikrein heavy chain. The isolated distal binding segment significantly prolongs the partial thromboplastin time of reconstituted Williams plasma thus stressing the critical role of the prekallikrein-H-kininogen complex formation in the initiation of the endogenous blood coagulation cascade.
DOI: --
发表时间: 1986-03
期刊: The Journal of biological chemistry
影响因子: --
作者:
Akitada Ichinose;Kazuo Fujikawa;Tadakazu SuyamaS
通讯作者: Akitada Ichinose;Kazuo Fujikawa;Tadakazu SuyamaS
人高分子量激肽原与血浆前激肽释放酶和因子 XI 结合的一级结构要求。
DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
作者:
Tait,JF;Fujikawa,K
通讯作者: Fujikawa,K
DOI: 10.1021/bi00357a017
发表时间: 1986-05-06
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
CHUNG, DW;FUJIKAWA, K;DAVIE, EW
通讯作者: DAVIE, EW
通过使用合理设计的合成类似物,精细绘制凝血因子 XI 上的高分子量激肽原结合位点。
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
Baglia,FA;Jameson,BA;Walsh,PN
通讯作者: Walsh,PN
凝血因子 XIa 上因子 IX 的底物结合位点的鉴定和化学合成。
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
Baglia,FA;Jameson,BA;Walsh,PN
通讯作者: Walsh,PN