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Updated: Jun 6, 2026

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
Published on: May 24, 2017
Purification, crystallization and preliminary X-ray diffraction analysis of DNA damage response A protein from
Mitsugu Yamada1, Katsuya Satoh, Issay Narumi
1Gene Resource Research Group, Life Science and Biotechnology Division, Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan.
Abstract:
DNA damage response A protein (DdrA) from Deinococcus radiodurans has been suggested to be involved in DNA-repair processes through binding to 3'-ends of single-stranded DNA, thereby protecting the ends from nuclease digestion. In this study, a recombinant C-terminally truncated form of D. radiodurans DdrA (DdrA157) comprising the first 157 residues of DdrA was expressed in Escherichia coli, purified and crystallized. Single crystals of DdrA157 were obtained by the hanging-drop method at 293 K. The crystal belonged to the monoclinic space group P2(1), with unit-cell parameters a=46.31, b=180.26, c=114.17 Å, β=90.02°. The crystal was expected to contain 14 molecules in the asymmetric unit. Diffraction data were collected to 2.35 Å resolution on beamline BL-5 at Photon Factory and initial phase determinations were attempted by the molecular-replacement method using the human Rad52 structure.
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