UVR8B

UVR8B is a gene found in the plant *Arabidopsis thaliana*. It is part of the UV RESISTANCE LOCUS 8 (UVR8) family of genes. The UVR8 protein is a photoreceptor that plays a crucial role in sensing and responding to damaging ultraviolet-B (UVB) radiation. UVB radiation, a component of sunlight, can cause DNA damage and negatively impact plant growth and development.

The UVR8B protein, like other UVR8 family members, contains a unique beta-propeller domain that binds to UV light. Upon exposure to UVB, the UVR8B protein undergoes a conformational change, leading to its dimerization and subsequent activation. This activation triggers a signaling cascade within the plant cell. This signaling pathway ultimately leads to the activation of downstream genes that help the plant cope with UVB stress. These responses can include the production of protective compounds, such as flavonoids, and adjustments in growth patterns. While the primary function of the UVR8 family is UVB sensing, the specific roles and nuances of individual members like UVR8B are still areas of active research. Understanding the function of UVR8B contributes to our broader knowledge of plant photobiology and their adaptation to environmental challenges.