Removal of psoralen monoadducts and crosslinks by human cell free extracts.

AUTOR(ES)

Reardon, J T

RESUMO

Human cell free extracts are capable of carrying out damage-induced DNA synthesis in response to DNA damage by UV, psoralen, and cisplatin. We show that this damage-induced DNA synthesis is associated with removal of psoralen adducts and therefore is 'repair synthesis' and not an aberrant DNA synthesis reaction potentiated by DNA deformed by adducts. By comparing the denaturable fraction of psoralen adducted DNA which becomes labeled in the repair reaction to that of terminally labeled DNA (without repair) we have found that all DNA synthesis induced by psoralen monoadducts is the consequence of removal of these adducts. By the same approach we have obtained preliminary evidence that this in vitro system is capable of removing psoralen crosslinks as well.

Documentos Relacionados

• Properties of damage-dependent DNA incision by nucleotide excision repair in human cell-free extracts.
• Homologous recombination catalyzed by human cell extracts.
• Accurate and efficient pre-mRNA splicing in Drosophila cell-free extracts.
• Strand specificity of mutagenic bypass replication of DNA containing psoralen monoadducts in a human cell extract.
• The rejoining of double-strand breaks in DNA by human cell extracts.