UV radiation absorption

UV radiation absorption describes the process by which various chromophores—including DNA, proteins, melanin, and small molecules—absorb ultraviolet light, leading to biological and chemical effects such as DNA damage, protein modification, and the formation of reactive oxygen species[1][3][5][6]. It is not itself a druggable target, receptor, enzyme, transporter, or biomolecule, but rather a physical phenomenon relevant to photobiology, photoprotection, and photo-induced damage[1][3][4][5]. In biological systems, multiple molecules (chromophores) are responsible for UV absorption, including DNA (maximally in the UV-C/UV-B range), aromatic amino acids in proteins, melanin, and other specialized pigments[1][3][4][5]. UV-absorbing molecules play protective roles (e.g., melanin in skin) or lead to stress and damage (DNA mutations, ROS generation)[1][3][6]. In plants, specialized UV-absorbing photoreceptors, such as UVR8 (UV Resistance Locus 8), mediate physiological responses to UV-B, but "UV radiation absorption" alone does not uniquely identify UVR8 or any specific photoreceptor[2]. Summary: "UV radiation absorption" is not a molecular entity but a process, therefore it does not map to a druggable protein, receptor, enzyme, or similar biological target.