Zhou X, Shen Z, Li D, He X, Lin B. Study of interactions between actinomycin D and oligonucleotides by microchip electrophoresis and ESI-MS.
Talanta 2007;
72:561-7. [PMID:
19071655 PMCID:
PMC7111764 DOI:
10.1016/j.talanta.2006.11.019]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2006] [Revised: 08/13/2006] [Accepted: 11/14/2006] [Indexed: 12/02/2022]
Abstract
In the present study, the interactions between actinomycin D (ActD) and single stranded DNA (ssDNA) 5'-CGTAACCAACTGCAACGT-3' and a duplex stranded DNA (dsDNA) with this sequence were investigated by microchip-based non-gel sieving electrophoresis and electrospray ionization mass spectrometry (ESI-MS). The ssDNA was designed according to the conserved regions of open reading frame 1b (replicase 1B) following the Tor 2 SARS genome sequence of 15611-15593. The binding constants of the interactions between ActD and ssDNA/dsDNA were (8.3+/-0.32)x10(6)M(-1) (ssDNA) and (2.8+/-0.02)x10(5)M(-1) (dsDNA), respectively, calculated from microchip electrophoresis via Scatchard plot. The binding stoichiometries were 1:1 (single/1ActD molecule) and 1:2 (duplex/2ActD molecules) calculated from microchip electrophoresis, and the results were further verified by ESI-MS. The results obtained by these two methods indicated that ActD bound much more tightly to ssDNA used in this work than dsDNA. Furthermore, this is shown that the microchip-based non-gel sieving electrophoresis method is a rapid, highly sensitive and convenient method for the studies of interactions between DNA and small molecule drugs.
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