E2-RING expansion of the NEDD8 cascade confers specificity to cullin modification.

E2-RING expansion of the NEDD8 cascade confers specificity to cullin modification.
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DOI:
10.1016/j.molcel.2009.01.011
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发表时间:
2009-02-27
期刊:
影响因子:
16
通讯作者:
Schulman, Brenda A.
Schulman, Brenda A.
中科院分区:
生物学1区
文献类型:
--
作者:
Huang, Danny T.;Ayrault, Olivier;Hunt, Harold W.;Taherbhoy, Asad M.;Duda, David M.;Scott, Daniel C.;Borg, Laura A.;Neale, Geoffrey;Murray, Peter J.;Roussel, Martine F.;Schulman, Brenda A.

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泛素和泛素样蛋白(UBLs)通过E1、E2和E3酶的级联作用定向于靶标。最大的泛素E3亚类由cullin-RING连接酶(CRL)组成,其含有几种cullin(CUL 1、2、3、4或5)和RING蛋白(RBX 1或2)中的每一种。通过将UBL NEDD 8连接至保守的cullin Lys来激活CRL。如何确定cullin NEDD 8化特异性?在这里,我们报告说,像UBE 2 M(又名UBC 12),以前未表征的E2 UBE 2F是一个NEDD 8共轭酶在体外和体内。生物化学和结构分析表明,如何疏水E1-E2相互作用和E1构象的灵活性的可塑性允许一个E1充电多个E2。E2具有不同的功能,UBE 2 M/RBX 1和UBE 2F/RBX 2显示出不同的靶向cullin特异性。总之,这些研究揭示了NEDD 8缀合系统在建立选择性CRL活化中的分级扩展的分子基础和功能重要性。
Ubiquitin and ubiquitin-like proteins (UBLs) are directed to targets by cascades of E1, E2, and E3 enzymes. The largest ubiquitin E3 subclass consists of cullin-RING ligases (CRLs), which contain one each of several cullins (CUL1, 2, 3, 4, or 5) and RING proteins (RBX1 or 2). CRLs are activated by ligation of the UBL NEDD8 to a conserved cullin Lys. How is cullin NEDD8ylation specificity established? Here we report that like UBE2M (aka UBC12), the previously uncharacterized E2 UBE2F is a NEDD8 conjugating enzyme in vitro and in vivo. Biochemical and structural analyses indicate how plasticity of hydrophobic E1–E2 interactions and E1 conformational flexibility allow one E1 to charge multiple E2s. The E2s have distinct functions, with UBE2M/RBX1 and UBE2F/RBX2 displaying different target cullin specificities. Together, these studies reveal the molecular basis for and functional importance of hierarchical expansion of the NEDD8 conjugation system in establishing selective CRL activation.
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