Polymerase Synthesis and Restriction Enzyme Cleavage of DNA Containing 7-Substituted 7-Deazaguanine Nucleobases.
Chembiochem
; 16(15): 2225-36, 2015 Oct 12.
Article
em En
| MEDLINE
| ID: mdl-26382079
ABSTRACT
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 (dG(R) TPs), 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 dG(R) TPs 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.
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Base de dados:
MEDLINE
Assunto principal:
DNA
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Desoxirribonucleotídeos
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DNA Polimerase Dirigida por DNA
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Guanina
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article