A Fluorophore-labeled Peptide of Human Ribosomal Protein S3 for the Detection of the 8-Oxoguanine within the Cells

作者：Han Se Hee; Hahm Soo Hyun; Tran An Hue Vy; Park Jin Woo; Chung Ji Hyung; Park Geon Tae; Han Ye Sun^*

来源：Bulletin of the Korean Chemical Society, 2015, 36(10): 2451-2457.

DOI：10.1002/bkcs.10472

• Human ribosomal protein S3
• 8-Oxoguanine
• Human 8-oxoguanine glycosylase 1
• 8-OxoG-detecting imaging probes

Detection and quantification of 8-oxo-7,8-dihydroguanine (8-oxoG) within cells are important for the study of the molecular mechanisms in cancer. Human ribosomal protein S3 (hRpS3), which involved in DNA repair, has high binding affinity to 8-oxoG. We developed an imaging probe to detect 8-oxoG using a specific peptide of hRpS3. Sequence analysis was conducted to elucidate the 8-oxoG-specific binding region of hRpS3, and three truncated mutants, D1 (amino acids 1-85), D2 (amino acids 86-159), and D3 (amino acids 160-242), were constructed. Both wild-type-hRpS3 and D2 were able to bind 8-oxoG, which is consistent with the results of a previous report on the role of K134 in Drosophila melanogasterRpS3. We synthesized a specific peptide and covalently linked with a fluorophore (FPR-552, similar to Cy3) to generate an 8-oxoG imaging probe. Our 8-oxoG S3-probe successfully detected the presence of 8-oxoG in damaged cells. Furthermore, this probe has threefold higher sensitivity than 8-oxoG DNA lesion antibody.

• 出版日期2015-10