Disruption of Wnt planar cell polarity signaling by aberrant accumulation of the MetAP-2 substrate Rab37.

Disruption of Wnt planar cell polarity signaling by aberrant accumulation of the MetAP-2 substrate Rab37.
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DOI:
10.1016/j.chembiol.2011.07.020
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发表时间:
2011-10-28
影响因子:
--
通讯作者:
Crews CM
Crews CM
中科院分区:
生物1区
文献类型:
--
作者:
Sundberg TB;Darricarrere N;Cirone P;Li X;McDonald L;Mei X;Westlake CJ;Slusarski DC;Beynon RJ;Crews CM

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蛋氨酸氨肽酶-2(MetAP-2)作为抗血管生成化合物TNP-470的分子靶标的鉴定引发了对N-末端Met切除(NME)在内皮细胞生物学中作用的兴趣。在这方面,我们最近证明,MetAP-2抑制抑制Wnt平面细胞极性(PCP)信号传导,内皮细胞依赖于这一途径的正常功能。尽管有这一进展,但其活性在MetAP-2抑制后改变,导致Wnt PCP信号传导丧失的底物尚不清楚。在这里,我们将小G蛋白Rab 37鉴定为在TNP-470存在下积累的新型MetAP-2底物。使用对NME具有抗性的Rab 37点突变体证明了异常Rab 37积累在TNP-470的作用模式中的功能作用,因为该突变体的表达表型模仿了MetAP-2抑制对Wnt PCP信号传导依赖性过程的影响。
Identification of methione aminopeptidase-2 (MetAP-2) as the molecular target of the antiangiogenic compound TNP-470 has sparked interest in N-terminal Met excision’s (NME) role in endothelial cell biology. In this regard, we recently demonstrated that MetAP-2 inhibition suppresses Wnt planar cell polarity (PCP) signaling and that endothelial cells depend on this pathway for normal function. Despite this advance, the substrate(s) whose activity is altered upon MetAP-2 inhibition, resulting in loss of Wnt PCP signaling, is not known. Here, we identify the small G-protein Rab37 as a novel MetAP-2 substrate that accumulates in the presence of TNP-470. A functional role for aberrant Rab37 accumulation in TNP-470’s mode-of-action is demonstrated using a Rab37 point-mutant that is resistant to NME because expression of this mutant phenocopies the effects of MetAP-2 inhibition on Wnt PCP signaling-dependent processes.
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