A binary system of photoreagents for high-efficiency labeling of DNA polymerases.
To increase the efficiency of photoaffinity labeling of DNA polymerases, a binary system of photoaffinity reagents was applied. Photoreactive radioactive primers were synthesized by DNA polymerases beta (pol beta) or DNA polymerase from Thermus thermophilus (pol Tte) using a template-primer duplex in the presence of a dTTP analogue containing 4-azidotetrafluorobenzoyl group linked via spacers of varying length to 5-position of uridine ring- 5-[N-(2,3,5,6-tetrafluoro-4-azidobenzoyl)-amino-trans-propenyl-1]-2'-deoxyuridine-5'-triphosphate (FAB-4-dUTP) or 5-[N-[[(2,3,5,6-tetrafluoro-4-azidobenzoyl)-butanoyl]-amino]-trans-3-aminopropenyl-1]-2'-deoxyuridine-5'-triphosphate (FAB-9-dUTP). The reaction mixtures were UV irradiated (lambda = 365-450 nm) in the absence or presence of a dTTP analog, containing a pyrene moiety-5-[N-(4-(1-pyrenyl)-butylcarbonyl)-amino-trans-propenyl-1]-2'-deoxyuridine-5'-triphosphate (Pyr- 8-dUTP) or 5-[N-(4-(1-pyrenyl)-ethylcarbonyl)-amino-trans-propenyl-1]-2'-deoxyuridine-5'-triphosphate (Pyr-6-dUTP). The most efficient crosslinking of both DNA polymerases was observed in the case of photoreactive DNA primer, carrying the FAB-4-dUMP moiety at the 3'-end, and Pyr-6-dUTP as a sensitizer. The binary system of photoaffinity reagents allows increasing photoaffinity labeling of the both DNA polymerases in comparison to the primer crosslinking without photosensitizer.
Lebedeva
N A
NA
Novosibirsk Institute of Bioorganic Chemistry, Siberian Division, Russian Academy of Sciences, Pr. Lavrentiev 8, 630090, Novosibirsk, Russian Federation.
Kolpashchikov
D M
DM
Rechkunova
N I
NI
Khodyreva
S N
SN
Lavrik
O I
OI
D017931:DNA Primers; D004259:DNA-Directed DNA Polymerase / Q000378:metabolism*; D003856:Deoxyuracil Nucleotides / Q000737:chemistry / Q000378:metabolism*; D019920:Photoaffinity Labels / Q000737:chemistry / Q000378:metabolism*; D017319:Photosensitizing Agents / Q000737:chemistry / Q000378:metabolism
C119021:5-(N-(2,3,5,6-tetrafluoro-4-azidobenzoyl)aminopropenyl-1)-2'-deoxyuridine-5'-triphosphate; D017931:DNA Primers; D003856:Deoxyuracil Nucleotides; D019920:Photoaffinity Labels; D017319:Photosensitizing Agents; D004259:DNA-Directed DNA Polymerase