Conformational flexibility of the oncogenic protein LMO2 primes the formation of the multi-protein transcription complex.

Conformational flexibility of the oncogenic protein LMO2 primes the formation of the multi-protein transcription complex.
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致癌蛋白LMO2素的构象柔韧性形成了多蛋白转录复合物的形成。

DOI:
10.1038/srep03643
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发表时间:
2014-01-10
期刊:
影响因子:
4.6
通讯作者:
Rabbitts TH
Rabbitts TH
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Sewell H;Tanaka T;El Omari K;Mancini EJ;Cruz A;Fernandez-Fuentes N;Chambers J;Rabbitts TH

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LMO2是通过染色体易位在T细胞白血病中发现的,正常情况下被证明是造血所必需的。LMO2由两个LIM结构域组成(因此它是一个LIM蛋白),并在多蛋白复合体中形成一座桥梁。我们已经研究了这种复合体的形成机制,它使用一个单域抗体片段,通过以非功能形式隔离LMO2来抑制LMO2。对含有该抗体片段的LMO2的晶体结构进行了解析,发现与其正常结合相比,两个LIM结构域之间的位置和角度存在构象差异。这种扭曲是通过在LMO2的中心螺旋区弯曲而发生的。这是一种抑制细胞内蛋白质功能的独特机制,结构挫伤意味着一种模型,在该模型中,新合成的、内在无序的LMO2与伴侣蛋白结合,从而形成进一步的相互作用,并为LMO2的治疗靶向提供了建议。
LMO2 was discovered via chromosomal translocations in T-cell leukaemia and shown normally to be essential for haematopoiesis. LMO2 is made up of two LIM only domains (thus it is a LIM-only protein) and forms a bridge in a multi-protein complex. We have studied the mechanism of formation of this complex using a single domain antibody fragment that inhibits LMO2 by sequestering it in a non-functional form. The crystal structure of LMO2 with this antibody fragment has been solved revealing a conformational difference in the positioning and angle between the two LIM domains compared with its normal binding. This contortion occurs by bending at a central helical region of LMO2. This is a unique mechanism for inhibiting an intracellular protein function and the structural contusion implies a model in which newly synthesized, intrinsically disordered LMO2 binds to a partner protein nucleating further interactions and suggests approaches for therapeutic targeting of LMO2.
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