First aid kit in some living organisms helps fix DNA after lengthy sun exposure (Vol. 48, No. 5-6)

Important photolyase residues for DNA binding.”

New study unveils the binding mechanisms of enzymes capable of repairing DNA damaged by UV light before any risk of cellular malfunction sets in

Sunburn in living organisms is caused by ultraviolet (UV) light from the sun damaging the DNA in the cells. Many organisms, however, have an in-built mechanism for repairing the sun damage. This is possible thanks to an enzyme called DNA photolyase, which is so specialised that cryptochrome, a structurally similar molecule, is unable to do the same job. By comparing both types of molecule, physicists can understand precisely how the ability of our enzymes to repair DNA boils down to the most minute structural details. In a study published recently, the authors pinpoint the mechanism by which repair enzymes bind to the damaged site.

K. Aalbæk Jepsen and I. A. Solov'yov, On binding specificity of (6-4) photolyase to a T(6-4)T DNA photoproduct, Eur. Phys. J. D 71, 155 (2017)