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Journal articles
Anomalous electrophoretic migration of short oligodeoxynucleotides labelled with 5′-terminal Cy5 dyes
Abstract : By using a fluorescent exonuclease assay, we reported unusual electrophoretic mobility of 5'-indocarbo-cyanine 5 (5'-Cy5) labelled DNA fragments in denaturing polyacrylamide gels. Incubation time and enzyme concentration were two parameters involved in the formation of 5'-Cy5-labelled degradation products, while the structure of the substrate was slightly interfering. Replacement of positively charged 5'-Cy5-labelled DNA oligonucleotides (DNA oligos) by electrically neutral 5'-carboxyfluorescein (5'-FAM) labelled DNA oligos abolished the anomalous migration pattern of degradation products. MS analysis demonstrated that anomalously migrating products were in fact 5'-labelled DNA fragments ranging from 1 to 8 nucleotides. Longer 5'-Cy5-labelled DNA fragments migrated at the expected position. Altogether, these data highlighted, for the first time, the influence of the mass/charge ratio of 5'-Cy5-labelled DNA oligos on their electrophoretic mobility. Although obtained by performing 3' to 5' exonuclease assays with the family B DNA polymerase from Pyrococcus abyssi, these observations represent a major concern in DNA technology involving most DNA degrading enzymes.
https://hal.univ-brest.fr/hal-01111501
Contributor : Adminhal Univbrestbu <>
Submitted on : Friday, January 30, 2015 - 2:30:52 PM
Last modification on : Tuesday, June 25, 2019 - 2:06:03 PM
Contributor : Adminhal Univbrestbu <>
Submitted on : Friday, January 30, 2015 - 2:30:52 PM
Last modification on : Tuesday, June 25, 2019 - 2:06:03 PM
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