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Faithful initiation of ribosomal RNA transcription from cloned DNA by purified RNA polymerase I 总被引:8,自引:0,他引:8
M R Paule C T Iida P J Perna G H Harris S L Brown Shimer P Kownin 《Biochemistry》1984,23(18):4167-4172
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The human GINS complex binds to and specifically stimulates human DNA polymerase alpha-primase 总被引:1,自引:0,他引:1 下载免费PDF全文
The eukaryotic GINS complex has an essential role in the initiation and elongation phases of genome duplication. It is composed of four paralogous subunits--Sld5, Psf1, Psf2 and Psf3--which are ubiquitous and evolutionarily conserved in eukaryotic organisms. Here, we report the biochemical characterization of the human GINS complex (hGINS). The four hGINS subunits were coexpressed in Escherichia coli in a highly soluble form and purified as a complex. hGINS was shown to interact directly with the heterodimeric human DNA primase, by using either surface plasmon resonance measurements or by immunoprecipitation experiments carried out with anti-hGINS antibodies. The DNA polymerase alpha-primase synthetic activity was specifically stimulated by hGINS on various primed DNA templates. The significance of these findings is discussed in view of the molecular dynamics at the human replication fork. 相似文献
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