Structural basis for loading of Transcription Repair-Coupling factor Mfd onto stalled elongation complexes

Transcription-coupled repair (TCR) is a nucleotide excision repair sub-pathway that preferentially removes lesions from the DNA template-strand stalling RNA polymerase (RNAP) elongation complexes (ECs). In bacteria, the superfamily 2 Mfd translocase mediates TCR by displacing stalled ECs and recruiting Uvr(A)B. Using cryo-electron microscopy, we previously visualized seven Mfd-EC complexes spanning the ATP-dependent Mfd loading and EC displacement pathway [L1 -> L2(ADP) -> C1(ATP) -> C2(ATP) -> C3(ADP) -> C4(ADP) -> C5(ATP)]. The first intermediate (L1) was poorly resolved (4.1 Å nominal resolution) due to low particle occupancy. The pathway is characterized by very large Mfd structural transitions, notably the L1 -> L2 transition. Here, we pre-loaded Mfd with ATP in the presence of the γ -phosphate mimic, BeF ₃ ⁻ , limiting rounds of ATP hydrolysis. The resulting accumulation of early intermediates allowed us to resolve the L1 intermediate to 3.5 Å nominal resolution, revealing bound ADP-BeF ₃ ⁻ . We also identified a new intermediate between L1 and L2, L1.5, providing further insight into Mfd conformational changes during loading.