Download MendeleyStructural Basis for Transcription-coupled Repair: the N Terminus of Mfd Resembles UvrB with Degenerate ATPase Motifs
Assenmacher, N., Wenig, K., Lammens, A., Hopfner, K.-P.(2006) J Mol Biol 355: 675-683
- PubMed: 16309703
- DOI: https://doi.org/10.1016/j.jmb.2005.10.033
- Primary Citation of Related Structures:
2B2N - PubMed Abstract:
The transcription repair coupling factor Mfd removes stalled RNA polymerase from DNA lesions and links transcription to UvrABC-dependent nucleotide excision repair in prokaryotes. We report the 2.1A crystal structure of the UvrA-binding N terminus (residues 1-333) of Escherichia coli Mfd (Mfd-N). Remarkably, Mfd-N reveals a fold that resembles the three N-terminal domains of the repair enzyme UvrB. Domain 1A of Mfd adopts a typical RecA fold, domain 1B matches the damage-binding domain of the UvrB, and domain 2 highly resembles the implicated UvrA-binding domain of UvrB. However, Mfd apparently lacks a functional ATP-binding site and does not contain the DNA damage-binding motifs of UvrB. Thus, our results suggest that Mfd might form a UvrA recruitment factor at stalled transcription complexes that architecturally but not catalytically resembles UvrB.
Organizational Affiliation:
Gene Center and Department of Chemistry and Biochemistry, University of Munich (LMU), Feodor-Lynen-Str. 25, D-81377 Munich, Germany.
