Human CIA2A-FAM96A and CIA2B-FAM96B integrate iron homeostasis and maturation of different subsets of cytosolic-nuclear iron-sulfur proteins.

Human CIA2A-FAM96A and CIA2B-FAM96B integrate iron homeostasis and maturation of different subsets of cytosolic-nuclear iron-sulfur proteins.
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DOI:
10.1016/j.cmet.2013.06.015
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发表时间:
2013-08-06
期刊:
影响因子:
29
通讯作者:
Lill R
Lill R
中科院分区:
生物学1区
文献类型:
--
作者:
Stehling O;Mascarenhas J;Vashisht AA;Sheftel AD;Niggemeyer B;Rösser R;Pierik AJ;Wohlschlegel JA;Lill R

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许多参与代谢、DNA维持、蛋白质翻译或铁稳态的细胞质和核蛋白依赖于铁硫(Fe/S)辅助因子,但它们的组装尚不清楚。在这里,我们鉴定并表征了人类CIA2A (FAM96A)、CIA2B (FAM96B)和CIA1 (CIAO1)作为细胞质Fe/S蛋白组装(CIA)机制的组成部分。CIA1与CIA2A或CIA2B和CIA靶向因子MMS19相关。CIA2B-CIA1-MMS19复合物结合并促进大多数细胞质核铁/硫蛋白的组装。相比之下,CIA2A特异性地成熟铁调节蛋白(IRP) 1,这对细胞铁稳态至关重要。令人惊讶的是,第二层铁调控涉及通过CIA2A结合或CIA2B或MMS19耗尽来稳定IRP2,即使IRP2缺乏铁/S簇。综上所述,CIA2B-CIA1-MMS19和CIA2A-CIA1协助铁/S蛋白不同分支的组装,并通过IRP1铁/S簇成熟和IRP2稳定将这一过程与细胞铁调节密切联系起来。
Numerous cytosolic and nuclear proteins involved in metabolism, DNA maintenance, protein translation, or iron homeostasis depend on iron-sulfur (Fe/S) cofactors, yet their assembly is poorly defined. Here, we identify and characterize human CIA2A (FAM96A), CIA2B (FAM96B), and CIA1 (CIAO1) as components of the cytosolic Fe/S protein assembly (CIA) machinery. CIA1 associates with either CIA2A or CIA2B and the CIA targeting factor MMS19. The CIA2B-CIA1-MMS19 complex binds to and facilitates assembly of most cytosolic-nuclear Fe/S proteins. In contrast, CIA2A specifically matures iron regulatory protein (IRP) 1 which is critical for cellular iron homeostasis. Surprisingly, a second layer of iron regulation involves the stabilization of IRP2 by CIA2A binding or upon depletion of CIA2B or MMS19, even though IRP2 lacks a Fe/S cluster. In summary, CIA2B-CIA1-MMS19 and CIA2A-CIA1 assist different branches of Fe/S protein assembly, and intimately link this process to cellular iron regulation via IRP1 Fe/S cluster maturation and IRP2 stabilization.
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