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Pot1 is a conserved single-stranded DNA binding protein with crucial functions in the protection of telomeres and maintenance of their length. In this issue of Cell, two papers (Hockemeyer et al., 2006; Wu et al., 2006) examine the roles of murine Pot1 homologs and describe intriguing new insights into how cells protect their chromosome ends from DNA-repair activities.
The human testis Rad51 protein, a structural homolog of E. coli RecA, binds single- and double-stranded DNA and exhibits DNA-dependent ATPase activity. Using circular ssDNA and linear dsDNA (3.0 kb in length), we demonstrate that hRad51 promotes homologous pairing and strand exchange reactions in vitro. Joint molecule formation was dependent upon ATP hydrolysis and DNA homology and was stimulated...
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