Add time:07/25/2019         Source:sciencedirect.com

The 32P-postlabeling technique was used to investigate the efficiency of phosphorylation reaction by T4 polynucleotide kinase using seven synthetic adducted deoxyguanosine 3′-monophosphates. The adducts included cyclic N1,N2 derivatives and the C8 adduct of 4-aminobiphenyl. The adducted substrates were detected at a subfemtomole sensitivity except for one of the diastereomeric propanoguanine derivatives. In general, the recommended conditions were found to be proper for an efficient phosphorylation of the adducts studied. Sensitivity of the adducts to the 3′-dephosphorylation reaction of nuclease P1 was also tested. All the complex cyclic adducts were resistant towards P1. However, the ethenoguanine and 4-aminobiphenyl adducts were relatively sensitive towards P1. No differences were noted between diastereomers.

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