Rad33 is involved in nucleotide excision repair (NER). NER is the main pathway for repairing DNA lesions induced by UV. Cells deleted for RAD33 display intermediate UV sensitivity that is epistatic with NER [1].

1: Rad33, a new factor involved in nucleotide excision repair in Saccharomyces cerevisae. Dulk BD, Sun SM, de Ruijter M, Brandsma JA, Brouwer J; DNA Repair (Amst). 2006; [Epub ahead of print] PMID:16595192