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
中科院分区:
文献类型:
--
作者:
H. Herwald;T. Renné;J. Meijers;D. Chung;J. Page;R. Colman;W. Müller
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.
登录
查看更多内容
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
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
影响因子:
2.9
作者:
CHUNG, DW;FUJIKAWA, K;DAVIE, EW
通讯作者:
DAVIE, EW
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
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