The recognition of helix-distorting deoxyribonucleic acid (DNA) lesions by the global genome nucleotide excision repair subpathway is performed by the XPC-RAD23-CEN2 complex. Although it has been established that Rad23 homologs are essential to protect XPC from proteasomal degradation, it is unclear whether RAD23 proteins have a direct role in the recognition of DNA damage. In this paper, we show that the association of XPC with ultraviolet-induced lesions was impaired in the absence of RAD23 proteins. Furthermore, we show that RAD23 proteins rapidly dissociated from XPC upon binding to damaged DNA. Our data suggest that RAD23 proteins facilitate lesion recognition by XPC but do not participate in the downstream DNA repair process.
机构:
Univ Calif San Francisco, Auerback Melanoma Lab, UCSF Canc Ctr, San Francisco, CA 94143 USAUniv Calif San Francisco, Auerback Melanoma Lab, UCSF Canc Ctr, San Francisco, CA 94143 USA
机构:
Univ Calif San Francisco, Auerback Melanoma Lab, UCSF Canc Ctr, San Francisco, CA 94143 USAUniv Calif San Francisco, Auerback Melanoma Lab, UCSF Canc Ctr, San Francisco, CA 94143 USA