ArticleBMC biochemistry2002
A approximately 35 kDa polypeptide from insect cells binds to yeast ACS like elements in the presence of ATP.
Article in BMC biochemistry, 2002. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors at 2 institutions in 2 countries.
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Abstract
backgroundThe S. cerevisiae origin recognition complex binds to the ARS consensus sequence in an ATP dependent fashion. Recently, the yeast Cdc6 has been reported to have DNA binding activity. Conservation of replication proteins among different species strongly supports their functional similarity. Here we report the results of an investigation into the DNA binding activity of human Cdc6 protein. Cdc6 was expressed and purified from baculovirus infected Sf9 (Spodoptera frugiperda) insect cells as GST fusion protein (GST-Cdc6) and its DNA binding activity was tested.
resultsPartially purified fractions containing GSTCdc6 or GST showed an ACS binding activity in an ATP dependent manner. However, further purification revealed the presence of a putative 35 kDa insect cell protein (p35) which was found responsible for the DNA binding activity. A close match to the 9/11 bases of the ARS consensus sequence was sufficient for p35 binding activity. A DNA fragment from the human c-myc origin region containing yeast ACS like elements also showed p35 binding activity.
conclusionsWe have identified a Spodoptera frugiperda protein with ATP dependent DNA binding activity to ACS like elements. ACS like elements have been reported to be essential for ORC binding and replication initiation in yeast but their role in higher eukaryotes still remains elusive. Like the ARS consensus sequence elements of yeast, ACS like elements found in c-myc and lamin beta 2 origin regions may play similar roles in replication and indicate a conserved role for this DNA motif among eukaryotes.
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