title: Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry for the detection of polymerase chain reaction products containing 7-deazapurine moieties.
abstract: Double-stranded DNA fragments of different length with and without the incorporation of 7-deazapurine deoxynucleotides have been prepared via the polymerase chain reaction (PCR) using exo(-)Pseudococcus furiosus DNA polymerase, unmodified primers, and c7-dATP and c7-dGTP as the only purine triphosphates. In spite of the presence of some unmodified purine moieties due to the primers, matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry revealed remarkable differences between the modified and unmodified DNA fragments. The incorporation of 7-deazapurine nucleotides resulted in a significant reduction of fragmentation and therefore in increased signal intensities and higher mass resolution. The molecular weights could be determined with an accuracy of up to 0.03%. Mass resolution was sufficient to resolve the (M + H)+ signals of the two single strands of a 7-deazapurine-containing 99-base-pair DNA duplex. Thus, MALDI-TOF mass spectrometry offers a very fast and accurate way to detect and analyze short PCR products sufficient in length for many diagnostic applications without gel electrophoresis and labeling.
authors.affiliation: Department of Biochemistry and Molecular Biology, Faculty of Chemistry, University of Hamburg, Germany.
authors.forename: C W
authors.initials: CW
authors.lastname: Siegert
authors.forename: A
authors.initials: A
authors.lastname: Jacob
authors.forename: H
authors.initials: H
authors.lastname: Köster
mesh_terms: D001345:Autoradiography; D001483:Base Sequence; D004591:Electrophoresis, Polyacrylamide Gel; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction / Q000379:methods; D011687:Purines / Q000032:analysis*; D017422:Sequence Analysis, DNA / Q000379:methods*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*
chemical_list: D011687:Purines