Details

Autor(en) / Beteiligte

• Mačková, Michaela
• Boháčová, Soňa
• Perlíková, Pavla
• Poštová Slavětínská, Lenka
• Hocek, Michal

Titel

Polymerase Synthesis and Restriction Enzyme Cleavage of DNA Containing 7-Substituted 7-Deazaguanine Nucleobases

Ist Teil von

• Chembiochem : a European journal of chemical biology, 2015-10, Vol.16 (15), p.2225-2236

Ort / Verlag

Germany: Blackwell Publishing Ltd

Erscheinungsjahr

2015

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• Previous studies of polymerase synthesis of base‐modified DNAs and their cleavage by restriction enzymes have mostly related only to 5‐substituted pyrimidine and 7‐substituted 7‐deazaadenine nucleotides. Here we report the synthesis of a series of 7‐substituted 7‐deazaguanine 2′‐deoxyribonucleoside 5′‐O‐triphosphates (dGRTPs), their use as substrates for polymerase synthesis of modified DNA and the influence of the modification on their cleavage by type II restriction endonucleases (REs). The dGRTPs were generally good substrates for polymerases but the PCR products could not be visualised on agarose gels by intercalator staining, due to fluorescence quenching. The presence of 7‐substituted 7‐deazaguanine residues in recognition sequences of REs in most cases completely blocked the cleavage. Modified G:C pairs block the cleavage of DNA by restriction endonucleases, whereas small major‐groove modifications at A:T pairs are tolerated. A series of 7‐substituted 7‐deazaguanine 2′‐deoxyribonucleoside 5′‐O‐triphosphates (dGRTPs) have been synthesised, and their use as substrates for polymerase synthesis of modified DNA and their cleavage by REs have been studied.