Mouse hepatocyte growth factor (HGF) activator inhibitor type 2 lacking the first Kunitz domain potently inhibits the HGF activator

Mouse hepatocyte growth factor (HGF) activator inhibitor type 2 lacking the first Kunitz domain potently inhibits the HGF activator
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DOI:
10.1006/bbrc.2001.6313
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发表时间:
2002-01-25
影响因子:
3.1
通讯作者:
Shimomura, T
Shimomura, T
中科院分区:
生物学4区
文献类型:
--
作者:
Kataoka, H;Itoh, H;Shimomura, T

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肝细胞生长因子激活物抑制剂2型(HAI-2)是一种丝氨酸蛋白酶抑制剂,含有两个Kunitz型抑制剂结构域,最初被鉴定为肝细胞生长因子激活物(HGFA)的有效抑制剂。在先前的研究(Biochem.Biophys.Biochem.Biophys.Biochem.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys.Biophys. Res. Commun. 255,740 - 748,1999),我们报道了小鼠HAI-2的主要转录物是缺乏第一Kunitz结构域(KD-1)的剪接变体。由于据报道KD-1负责抑制人HAI-2中的HGFA,而人HAI-2的第二个Kunitz结构域(KD-2)对HGFA的抑制作用小得多,因此已经表明大多数小鼠HAI-2可能对抑制HGFA无效。在这项研究中,我们已经进行了Kunitz域在小鼠HAI-2的功能特性,通过使用中国仓鼠卵巢细胞合成的重组蛋白质没有或点突变的推定反应位点的每个Kunitz域。结果显示,与人HAI-2不同,小鼠HAI-2的KD-2有效地抑制HGFA。因此,仅由KD-2组成的主要小鼠HAI-2蛋白可以是体内HGF活化的有效抑制剂。(C)2002 Elsevier Science(美国)。
Hepatocyte growth factor activator inhibitor type 2 (HAI-2) is a serine proteinase inhibitor containing two Kunitz-type inhibitor domains, initially identified as a potent inhibitor of hepatocyte growth factor activator (HGFA). In a previous study (Biochem. Biophys. Res. Commun. 255, 740 -748, 1999), we reported that a predominant transcript of mouse HAI-2 is a splicing variant lacking the first Kunitz domain (KD-1). Since KD-1 was reported to be responsible for the inhibition of HGFA in human HAI-2 and the second Kunitz domain (KD-2) of human HAI-2 was much less inhibitory against HGFA, it has been suggested that most of mouse HAI-2 may be ineffective in inhibiting HGFA. In this study, we have performed functional characterization of Kunitz domains in mouse HAI-2 by using recombinant proteins synthesized by Chinese hamster ovary cells without or with point mutation in the putative reactive site of each Kunitz domain. The results revealed that, unlike human HAI-2, KD-2 of mouse HAI-2 efficiently inhibits HGFA. Therefore, the major mouse HAI-2 protein that consists only of KD-2 can be a potent inhibitor of HGF activation in vivo. (C) 2002 Elsevier Science (USA).