Medical Recapitulate

摘要

泛素蛋白酶体途径是真核生物体内最重要的蛋白质降解途径之一，其中，目标蛋白的泛素化过程涉及泛素激活酶、泛素结合酶和泛素蛋白连接酶（E 3）。目标蛋白识别中起关键作用的是E 3， Kip1泛素－促进复合体（ KPC）是一种E3复合体，由KPC1和 KPC2组成，KPC1在 C端含有一个环指结构域作为催化亚基，是E3不可缺少的组成部分，KPC2含有一个类泛素结构域和两个泛素相关结构域。 KPC广泛存在于真核生物中，在神经系统疾病、血液系统疾病、肿瘤疾病等方面起着重要的调控作用。%Ubiquitin-proteasome pathway is one of the most important protein degradation pathways in eukaryotes,among which ubiquitination of target proteins involves in the ubiquitin-activating enzyme, the ubiquitin-conjugating enzyme and the ubiquitin ligase ( E3 ) .The ubiquitin ligase plays a key role in the identification of target proteins,Kip1 ubiquitination-promoting complex( KPC) being a ubiquitin ligase com-plex that consists of KPC1 and KPC2.KPC1 contains a RING finger domain at the C-terminus as the catalytic subunit that is the integral part of the ubiquitin ligase E3,and KPC2 contains a ubiquitin-like domain and two ubiquitin-associated domains.KPC is widespread in the eukaryotes,playing an important role of regula-tion in nervous system diseases,blood diseases and neoplastic diseases.