Structural and functional analyses of disease-causing missense mutations in Bloom syndrome protein.

Structural and functional analyses of disease-causing missense mutations in Bloom syndrome protein.
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DOI:
10.1093/nar/gkm536
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发表时间:
2007
影响因子:
14.9
通讯作者:
Xi XG
Xi XG
中科院分区:
生物学2区
文献类型:
--
作者:
Guo RB;Rigolet P;Ren H;Zhang B;Zhang XD;Dou SX;Wang PY;Amor-Gueret M;Xi XG

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Bloom综合征(BS)是一种常染色体隐性遗传病,以基因组不稳定和多种癌症的早期发展为特征。在受影响的个体中已经发现了BLM基因(编码RecQ解旋酶)的错义突变,但这些突变影响的分子机制和结构基础仍有待阐明。我们分析了位于BLM解旋酶核心区的五个致病错义突变:Q672R、I841T、C878R、G891E和C901Y。致病突变株具有较低的ATPase和解旋酶活性,但其ATP结合能力正常,但Q672的ATP结合活性低于完整的BLM解旋酶。位于Motif IV附近的突变体C878R和位于Motif IV附近的G891E和C901Y显示出严重的DNA结合缺陷。我们使用分子模型来分析这些突变。我们的工作提供了对BLM病理学的分子基础的见解,并揭示了DNA结合与ATP水解和DNA解离所涉及的结构元素。我们的发现将有助于解释BLM催化的机制,并解释新的BLM导致未来发现的突变。
Bloom syndrome (BS) is an autosomal recessive disorder characterized by genomic instability and the early development of many types of cancer. Missense mutations have been identified in the BLM gene (encoding a RecQ helicase) in affected individuals, but the molecular mechanism and the structural basis of the effects of these mutations remain to be elucidated. We analysed five disease-causing missense mutations that are localized in the BLM helicase core region: Q672R, I841T, C878R, G891E and C901Y. The disease-causing mutants had low ATPase and helicase activities but their ATP binding abilities were normal, except for Q672, whose ATP binding activity was lower than that of the intact BLM helicase. Mutants C878R, mapping near motif IV, and G891E and C901Y, mapping in motif IV, displayed severe DNA-binding defects. We used molecular modelling to analyse these mutations. Our work provides insights into the molecular basis of BLM pathology, and reveals structural elements implicated in coupling DNA binding to ATP hydrolysis and DNA unwinding. Our findings will help to explain the mechanism underlying BLM catalysis and interpreting new BLM causing mutations identified in the future.
DOI: 10.1093/nar/gkl538
发表时间: 2006
影响因子: 14.9
作者:
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通讯作者: Keck, James L.
DOI: 10.1074/jbc.m311272200
发表时间: 2004-02-20
影响因子: 4.8
作者:
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发表时间: 1960-01-01
期刊: BIOCHIMICA ET BIOPHYSICA ACTA
影响因子: --
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DOI: 10.1093/nar/gkg376
发表时间: 2003-06-01
影响因子: 14.9
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DOI: 10.1016/s0959-440x(05)80116-2
发表时间: 1993-06-01
影响因子: 6.8
作者:
GORBALENYA, AE;KOONIN, EV
通讯作者: KOONIN, EV