Studies on the involvement of chaperone proteins in DNA replication have been limited to a few replication systems, belonging primarily to the prokaryotic world. The insights gained from these studies have substantially contributed to our understanding of the eukaryotic DNA replication process as well. The finding that molecular chaperones can activate some initiation proteins before DNA synthesis has led to the more general suggestion that molecular chaperones can influence the DNA-binding activity of many proteins, including transcriptional factors involved in cell regulatory systems. The DnaK/DnaJ/GrpE molecular chaperone system became a paradigm of our understanding of fundamental processes, such as protein folding, translocation, selective proteolysis and autoregulation of the heat-shock response. Studies on the Clp ATPase family of molecular chaperones will help to define the nature of signals involved in chaperone-dependent proteins' refolding and the degradation of misfolded proteins.
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