Cdc13 both positively and negatively regulates telomere replication

Article Abstract:

Research shows that the single-strand telomeric DNA-binding protein Cdc13 exhibits two regulatory roles, positively influencing telomere replication by binding of telomerase and negatively by binding of Cdc13-interacting protein Stn1 to Cdc13 sites.

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A model for the abrogation of the SOS response by an SOS protein: a negatively charged helix in DinI mimics DNA in its interaction with RecA

Article Abstract:

Research indicates that the C-terminal alpha-helix is the active site of the SOS negative regulator protein DinI in Escherichia coli. Data further reveal that the alpha-helix is negatively charged and interferes in the RecA activation by interacting with the homologous pairing region of RecA.

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Ku interacts with telomerase RNA to promote telomere addition at native and broken chromosome ends

Article Abstract:

Results demonstrate that the DNA end-binding protein Ku binds the RNA component of telomerase, TLC1, and disruption of the binding leads to 10- to 100-fold reduction in the telomere-mediated DNA repair. Data suggest that the interaction between Ku and TLC1 RNA aids telomerase activity at both broken and normal chromosome ends.

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