Purity > 90% as determined by SDS-PAGE. MW: 73.7kDa. Full Length: 1-472aa. N-terminal 10xHis-SUMO-tagged and C-terminal Myc-tagged. Escherichia coli (strain K12). Involved in repair of UV radiation-induced DNA damage. Catalyzes the light-dependent monomerization (300-600 nm) of cyclobutyl pyrimidine dimers (in cis-syn configuration), which are formed between adjacent bases on the same DNA strand upon exposure to ultraviolet radiation.