A Sequential Assembly Mechanism for Stable Cdc13 Dimerization on Telomeric DNA

A kinetically favored sequential pathway loads Cdc13 onto a 12-nucleotide telomeric DNA segment, with an initial binding event followed by recruitment of a second molecule.

• Why it matters: The mechanism governing how Cdc13 dynamically assembles on telomeres is unclear, despite known high-specificity binding and dimer/oligomer formation in solution.
• What they did: Using smFRET and CoSMoS together, the authors tracked single-molecule binding steps on a defined 12-nucleotide telomeric DNA segment to resolve monomer-to-dimer assembly kinetics.
• The result: The observed monomer-to-dimer transition supports a mechanistic basis for how Cdc13 coordinates telomere synthesis and protection, aligning with genetic evidence that monomeric binding alone is insufficient for length maintenance.

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