ClpP1P2 peptidase activity promotes biofilm formation in Pseudomonas aeruginosa.

ClpP1P2 peptidase activity promotes biofilm formation in Pseudomonas aeruginosa.
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ClpP1P2肽酶活性促进铜绿假单胞菌生物膜的形成。

DOI:
10.1111/mmi.14649
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发表时间:
2021-06
影响因子:
3.6
通讯作者:
Baker TA
Baker TA
中科院分区:
生物学2区
文献类型:
--
作者:
Mawla GD;Hall BM;Cárcamo-Oyarce G;Grant RA;Zhang JJ;Kardon JR;Ribbeck K;Sauer RT;Baker TA

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酪蛋白水解酶(CLP)是细菌蛋白分解的中心,控制细胞的生理和应激反应。它们由一个双环分隔的多肽酶(ClpP)和一个AAA+未折叠酶(ClpX或ClpA/ClpC)组成。与许多细菌不同,条件致病菌铜绿假单胞菌含有两个ClpP同源物:ClpP1和ClpP2。然而,这些同源物的具体功能在很大程度上难以捉摸。在这里,我们报告了PaClpP2的活性形式是异构体PaClpP17P27十四聚体的一部分,这是正常生物膜发育所必需的。PaClpP114和PaClpP17P27与铜绿假单胞菌ClpX和ClpA有不同的相互作用,表现出明显的多肽切割特异性。晶体结构表明,PaClpP2在其N-末端和C-末端具有非正则特征,这解释了其与展开酶相互作用较差的原因。然而,体内实验表明,PaClpP2肽酶活性部位对生物膜的发育具有独特的贡献。这些数据强烈地表明,不同类别的ClpP多肽酶亚基的特异性对蛋白质降解的生物学结果有贡献。PaClpP2的这种特殊作用突出了它是开发专门干扰铜绿假单胞菌晚期发育的抗菌剂的一个有吸引力的目标。
Caseinolytic proteases (Clp) are central to bacterial proteolysis and control cellular physiology and stress responses. They are composed of a double-ring compartmentalized peptidase (ClpP) and a AAA+ unfoldase (ClpX or ClpA/ClpC). Unlike many bacteria, the opportunistic pathogen P. aeruginosa contains two ClpP homologs: ClpP1 and ClpP2. The specific functions of these homologs, however, are largely elusive. Here, we report that the active form of PaClpP2 is a part of a heteromeric PaClpP17P27 tetradecamer that is required for proper biofilm development. PaClpP114 and PaClpP17P27 complexes exhibit distinct peptide cleavage specificities and interact differentially with P. aeruginosa ClpX and ClpA. Crystal structures reveal that PaClpP2 has non-canonical features in its N- and C-terminal regions that explain its poor interaction with unfoldases. However, experiments in vivo indicate that the PaClpP2 peptidase active site uniquely contributes to biofilm development. These data strongly suggest that the specificity of different classes of ClpP peptidase subunits contributes to the biological outcome of proteolysis. This specialized role of PaClpP2 highlights it as an attractive target for developing antimicrobial agents that interfere specifically with late-stage P. aeruginosa development.
DOI: 10.1016/j.bbamcr.2011.06.007
发表时间: 2012-01
期刊: Biochimica et biophysica acta
影响因子: --
作者:
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