Requirements for NPC–tT(AGU)C contact. (A) Localization of tT(AGU)C in mutants. Strains MC78 (wt), MC210 (Δnup2), MC131 (Δnup60), MC105 [Δtt(agu)c], MC83 (smc3-42), MC82 (mcd1-73), and MC180 (lys2∷256lacop) were evaluated after Cdc20 depletion. NPC colocalization was significantly lower in mutants. Pairwise χ2-tests, (***) <5 × 10−4; (**) <5 × 10−3; (*) < 5 × 10−2. (B) Nup60 occupancy at tDNAs. ChIP-qPCR of Nup60-TAP was performed with strains MC177 (wt), MC207 (Δnup2), MC178 (smc3-42), and MC179 (mcd1-73) after arrest in G1 or M phase. (No Ab) No TAP antibody. Nup60 was enriched at tDNAs significantly during M-phase arrest in the wild-type strain but not in mutants (P-values in Supplemental Table S4). (C) Localization of extrachromosomal tT(AGU)C. The half-filled boxes of the diagram represent recombinase target sites that were used to form DNA circles inducibly after arrest in M phase (Dubey and Gartenberg 2007).