The baculovirus single-stranded DNA binding protein, LEF-3, forms a homotrimer in solution

The baculovirus single-stranded DNA binding protein, LEF-3, forms a homotrimer in solution
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杆状病毒单链 DNA 结合蛋白 LEF-3 在溶液中形成同源三聚体

DOI:
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发表时间:
1997
影响因子:
5.4
通讯作者:
G. Rohrmann
G. Rohrmann
中科院分区:
医学2区
文献类型:
--
作者:
J. Evans;G. Rohrmann

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LEF-3是苜蓿银纹夜蛾多核衣壳多角体病毒瞬时DNA复制所需的六种蛋白质之一,具有单链DNA结合蛋白的性质。在这份报告中,我们表明,LEF-3相互作用与自身在酵母双杂交试验和谷胱甘肽S-转移酶融合亲和力测定。不能与全长LEF-3相互作用的LEF-3缺失克隆也不能支持瞬时DNA复制,这表明这种相互作用是LEF-3的正常功能所必需的。将LEF-3纯化至均一,并通过分析性超离心和非变性聚丙烯酰胺凝胶电泳进行表征。这些研究表明,LEF-3是作为一个132-kDa的复合物,表明其天然构象是同源三聚体。通过与戊二醛交联,然后通过基质辅助激光解吸/电离质谱法证实了这一结果。
LEF-3 is one of six proteins from Autographa californica multinucleocapsid polyhedrosis virus required for transient DNA replication and has the properties of a single-stranded DNA binding protein. In this report we demonstrate that LEF-3 interacts with itself in both yeast two-hybrid assays and glutathione S-transferase fusion affinity assays. LEF-3 deletion clones which were unable to interact with full-length LEF-3 also failed to support transient DNA replication, suggesting that this interaction is required for the proper function of LEF-3. LEF-3 was purified to homogeneity and characterized by analytical ultracentrifugation and native polyacrylamide gel electrophoresis. These studies revealed that LEF-3 was present as a 132-kDa complex, indicating that its native conformation is that of a homotrimer. This result was confirmed by cross-linking with glutaraldehyde followed by matrix-assisted laser desorption/ionization mass spectrometry.
DOI: 10.1073/pnas.91.23.11212
发表时间: 1994-11-08
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DOI: 10.1021/bi9526037
发表时间: 1996
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通讯作者: Anderson,SR