Hybrid molecular structure of the giant protease tripeptidyl peptidase II.

Hybrid molecular structure of the giant protease tripeptidyl peptidase II.
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DOI:
10.1038/nsmb.1870
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发表时间:
2010-08
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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三肽基肽酶II (Tripeptidyl peptidase II, TPP II)是已知最大的真核蛋白酶(6MDa)。它被认为作用于26S蛋白酶体的下游,从较长肽的N端切割三肽,并与许多细胞过程有关。在这里,我们报告了通过混合方法确定的果蝇TPP II的结构:二聚体的结构通过x射线晶体学解决,并与单粒子冷冻电子显微镜获得的全息复合物的三维图对接。由此产生的结构揭示了腔室系统内活性位点的区隔化,并表明存在决定裂解产物大小的分子标尺。此外,该结构表明TPP II的激活模型涉及柔性环的重新定位和活性位点丝氨酸的重新定位,将其耦合到全复合物组装和活性位点隔离。
Tripeptidyl peptidase II (TPP II) is the largest known eukaryotic protease (6MDa). It is believed to act downstream of the 26S proteasome cleaving tripeptides from the N– termini of longer peptides and it is implicated in numerous cellular processes. Here we report the structure of Drosophila TPP II determined by a hybrid approach: The structure of the dimer was solved by x–ray crystallography and docked into the three– dimensional map of the holocomplex obtained by single-particle cryo-electron microscopy. The resulting structure reveals the compartmentalization of the active sites inside a system of chambers and suggests the existence of a molecular ruler determining the size of the cleavage products. Furthermore, the structure suggests a model for activation of TPP II involving the relocation of a flexible loop and a repositioning of the active–site serine, coupling it to holocomplex assembly and active site sequestration.
DOI: 10.1002/prot.340070405
发表时间: 1990-01-01
影响因子: 2.9
作者:
CARTER, P;WELLS, JA
通讯作者: WELLS, JA
DOI: 10.1038/380403a0
发表时间: 1996-04-04
期刊: NATURE
影响因子: 64.8
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Rose, C;Vargas, F;Schwartz, JC
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发表时间: 2004-04-01
期刊: IMMUNITY
影响因子: 32.4
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发表时间: 1995-04-28
期刊: SCIENCE
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