PEX19 binds multiple peroxisomal membrane proteins, is predominantly cytoplasmic, and is required for peroxisome membrane synthesis.

PEX19 binds multiple peroxisomal membrane proteins, is predominantly cytoplasmic, and is required for peroxisome membrane synthesis.
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DOI:
10.1083/jcb.148.5.931
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发表时间:
2000-03-06
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Gould SJ
Gould SJ
中科院分区:
其他
文献类型:
--
作者:
Sacksteder KA;Jones JM;South ST;Li X;Liu Y;Gould SJ

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过氧化物酶体是几乎所有真核细胞的组成部分。虽然对过氧化物酶体基质蛋白的输入了解很多,但我们对过氧化物酶体膜蛋白(PMP)如何靶向并插入过氧化物酶体膜的理解非常有限。在这里,我们表明,PEX 19结合广谱的PMP,显示可饱和的PMP结合,并与其靶向过氧化物酶体所需的PMP区域相互作用。此外,PEX 19到细胞核的错误定位导致新合成的PMPs在细胞核中积累。在稳定状态下,PEX 19双峰分布在细胞质和过氧化物酶体之间,大部分蛋白质在细胞质中。我们建议PEX 19可以结合新合成的PMPs,并促进其插入过氧化物酶体膜。这一假设得到以下观察结果的支持:PEX 19的丢失导致PMP降解和/或PMP错误定位于PMPs。
Peroxisomes are components of virtually all eukaryotic cells. While much is known about peroxisomal matrix protein import, our understanding of how peroxisomal membrane proteins (PMPs) are targeted and inserted into the peroxisome membrane is extremely limited. Here, we show that PEX19 binds a broad spectrum of PMPs, displays saturable PMP binding, and interacts with regions of PMPs required for their targeting to peroxisomes. Furthermore, mislocalization of PEX19 to the nucleus leads to nuclear accumulation of newly synthesized PMPs. At steady state, PEX19 is bimodally distributed between the cytoplasm and peroxisome, with most of the protein in the cytoplasm. We propose that PEX19 may bind newly synthesized PMPs and facilitate their insertion into the peroxisome membrane. This hypothesis is supported by the observation that the loss of PEX19 results in degradation of PMPs and/or mislocalization of PMPs to the mitochondrion.
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