The molecular basis for selective assembly of the UBAP1-containing endosome-specific ESCRT-I complex.

The molecular basis for selective assembly of the UBAP1-containing endosome-specific ESCRT-I complex.
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DOI:
10.1242/jcs.140673
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发表时间:
2014-02-01
影响因子:
4
通讯作者:
Woodman P
Woodman P
中科院分区:
生物学2区
文献类型:
--
作者:
Wunderley L;Brownhill K;Stefani F;Tabernero L;Woodman P

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ESCRT-I 对于泛素化货物(如表皮生长因子受体)的多囊泡体 (MVB) 分选以及多种细胞功能(如细胞分裂和逆转录病毒出芽)至关重要。 ESCRT-I 有四个亚基; TSG101、VPS28、VPS37 和 MVB12。哺乳动物细胞中有多个 VPS37 和 MVB12 家族成员,它们与 ESCRT-I 的差异整合可以提供该复合物的功能特异性变体。然而,目前尚不清楚这些不同形式的 VPS37 和 MVB12 是否随机组合或在 ESCRT-I 内产生选择性配对,以及这种配对的机制基础是什么。在这里,我们表明,相对于其 VPS37 伙伴,将两个 MVB12 成员 UBAP1 和 MVB12A 纳入 ESCRT-I 具有高度选择性。我们将介导 UBAP1-VPS37A 选择性组装的区域映射到 VPS37A 的核心 ESCRT-I 结合域。相反,UBAP1 的选择性整合需要最小的 ESCRT-I 结合区域和邻近的预测螺旋。 ESCRT-I 组装中的生化特异性与功能专门化相匹配,因为 siRNA 介导的 UBAP1 耗尽(但不是 MVB12A 和 MVB12B)会破坏 MVB 处的泛素依赖性分选。
ESCRT-I is essential for the multivesicular body (MVB) sorting of ubiquitylated cargo such as epidermal growth factor receptor, as well as for several cellular functions, such as cell division and retroviral budding. ESCRT-I has four subunits; TSG101, VPS28, VPS37 and MVB12. There are several members of VPS37 and MVB12 families in mammalian cells, and their differential incorporation into ESCRT-I could provide function-specific variants of the complex. However, it remains unclear whether these different forms of VPS37 and MVB12 combine randomly or generate selective pairings within ESCRT-I, and what the mechanistic basis for such pairing would be. Here, we show that the incorporation of two MVB12 members, UBAP1 and MVB12A, into ESCRT-I is highly selective with respect to their VPS37 partners. We map the region mediating selective assembly of UBAP1–VPS37A to the core ESCRT-I-binding domain of VPS37A. In contrast, selective integration of UBAP1 requires both the minimal ESCRT-I-binding region and a neighbouring predicted helix. The biochemical specificity in ESCRT-I assembly is matched by functional specialisation as siRNA-mediated depletion of UBAP1, but not MVB12A and MVB12B, disrupts ubiquitin-dependent sorting at the MVB.
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