Affinity labeling of flap-endonuclease FEN-1 by photoreactive DNAs
Eukaryotic flap-endonuclease (FEN-1) is 42-kD single-subunit structure-specific nuclease that cleaves 5'-flap strands of the branched DNA structure and possesses 5'-exonuclease activity. FEN-1 participates in DNA replication, repair, and recombination. The interaction of FEN-1 with DNA str...
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Published in | Biochemistry (Moscow) Vol. 66; no. 7; pp. 733 - 739 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Springer Nature B.V
01.07.2001
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Abstract | Eukaryotic flap-endonuclease (FEN-1) is 42-kD single-subunit structure-specific nuclease that cleaves 5'-flap strands of the branched DNA structure and possesses 5'-exonuclease activity. FEN-1 participates in DNA replication, repair, and recombination. The interaction of FEN-1 with DNA structures generated during replication and repair was studied using two types of photoreactive oligonucleotides. Oligonucleotides bearing a photoreactive arylazido group at the 3'-end of the primer were synthesized in situ by the action of DNA polymerase beta using base-substituted photoreactive dUTP analogs as the substrates. The photoreactive group was also bound to the 5'-end phosphate group of the oligonucleotide by chemical synthesis. Interaction of FEN-1 with both 5'- and 3'-ends of the nick or with primer-template systems containing 5'- or 3'-protruding DNA strands was shown. Formation of a structure with the 5'-flap containing the photoreactive group results in decrease of the level of protein labeling caused by cleavage of the photoreactive group due to FEN-1 endonuclease activity. Photoaffinity labeling of proteins of mouse fibroblast cell extract was performed using the radioactively labeled DNA duplex with the photoreactive group at the 3'-end and the apurine/apyrimidine site at the 5'-end of the nick. This structure is a photoreactive analog of an intermediate formed during DNA repair and was generated by the action of cell enzymes from the initial DNA duplex containing the 3-hydroxy-2-hydroxymethyltetrahydrofurane residue. FEN-1 is shown to be one of the photolabeled proteins; this indicates possible participation of this enzyme in base excision repair. |
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AbstractList | Eukaryotic flap-endonuclease (FEN-1) is 42-kD single-subunit structure-specific nuclease that cleaves 5'-flap strands of the branched DNA structure and possesses 5'-exonuclease activity. FEN-1 participates in DNA replication, repair, and recombination. The interaction of FEN-1 with DNA structures generated during replication and repair was studied using two types of photoreactive oligonucleotides. Oligonucleotides bearing a photoreactive arylazido group at the 3'-end of the primer were synthesized in situ by the action of DNA polymerase beta using base-substituted photoreactive dUTP analogs as the substrates. The photoreactive group was also bound to the 5'-end phosphate group of the oligonucleotide by chemical synthesis. Interaction of FEN-1 with both 5'- and 3'-ends of the nick or with primer-template systems containing 5'- or 3'-protruding DNA strands was shown. Formation of a structure with the 5'-flap containing the photoreactive group results in decrease of the level of protein labeling caused by cleavage of the photoreactive group due to FEN-1 endonuclease activity. Photoaffinity labeling of proteins of mouse fibroblast cell extract was performed using the radioactively labeled DNA duplex with the photoreactive group at the 3'-end and the apurine/apyrimidine site at the 5'-end of the nick. This structure is a photoreactive analog of an intermediate formed during DNA repair and was generated by the action of cell enzymes from the initial DNA duplex containing the 3-hydroxy-2-hydroxymethyltetrahydrofurane residue. FEN-1 is shown to be one of the photolabeled proteins; this indicates possible participation of this enzyme in base excision repair. Eukaryotic flap-endonuclease (FEN-1) is 42-kD single-subunit structure-specific nuclease that cleaves 5"-flap strands of the branched DNA structure and possesses 5"-exonuclease activity. FEN-1 participates in DNA replication, repair, and recombination. The interaction of FEN-1 with DNA structures generated during replication and repair was studied using two types of photoreactive oligonucleotides. Oligonucleotides bearing a photoreactive arylazido group at the 3"-end of the primer were synthesized in situ by the action of DNA polymerase β using base-substituted photoreactive dUTP analogs as the substrates. The photoreactive group was also bound to the 5"-end phosphate group of the oligonucleotide by chemical synthesis. Interaction of FEN-1 with both 5"- and 3"-ends of the nick or with primer-template systems containing 5"- or 3"-protruding DNA strands was shown. Formation of a structure with the 5"-flap containing the photoreactive group results in decrease of the level of protein labeling caused by cleavage of the photoreactive group due to FEN-1 endonuclease activity. Photoaffinity labeling of proteins of mouse fibroblast cell extract was performed using the radioactively labeled DNA duplex with the photoreactive group at the 3"-end and the apurine/apyrimidine site at the 5"-end of the nick. This structure is a photoreactive analog of an intermediate formed during DNA repair and was generated by the action of cell enzymes from the initial DNA duplex containing the 3-hydroxy-2-hydroxymethyltetrahydrofurane residue. FEN-1 is shown to be one of the photolabeled proteins; this indicates possible participation of this enzyme in base excision repair.[PUBLICATION ABSTRACT] Eukaryotic flap-endonuclease (FEN-1) is 42-kD single-subunit structure-specific nuclease that cleaves 5QUOTATION_MARK-flap strands of the branched DNA structure and possesses 5QUOTATION_MARK-exonuclease activity. FEN-1 participates in DNA replication, repair, and recombination. The interaction of FEN-1 with DNA structures generated during replication and repair was studied using two types of photoreactive oligonucleotides. Oligonucleotides bearing a photoreactive arylazido group at the 3QUOTATION_MARK-end of the primer were synthesized in situ by the action of DNA polymerase b using base-substituted photoreactive dUTP analogs as the substrates. The photoreactive group was also bound to the 5QUOTATION_MARK-end phosphate group of the oligonucleotide by chemical synthesis. Interaction of FEN-1 with both 5QUOTATION_MARK- and 3QUOTATION_MARK-ends of the nick or with primer-template systems containing 5QUOTATION_MARK- or 3QUOTATION_MARK-protruding DNA strands was shown. Formation of a structure with the 5QUOTATION_MARK-flap containing the photoreactive group results in decrease of the level of protein labeling caused by cleavage of the photoreactive group due to FEN-1 endonuclease activity. Photoaffinity labeling of proteins of mouse fibroblast cell extract was performed using the radioactively labeled DNA duplex with the photoreactive group at the 3QUOTATION_MARK-end and the apurine/apyrimidine site at the 5QUOTATION_MARK-end of the nick. This structure is a photoreactive analog of an intermediate formed during DNA repair and was generated by the action of cell enzymes from the initial DNA duplex containing the 3-hydroxy-2-hydroxymethyltetrahydrofurane residue. FEN-1 is shown to be one of the photolabeled proteins; this indicates possible participation of this enzyme in base excision repair. |
Author | Khodyreva, S N Lavrik, O I Rechkunova, N I Khlimankov, D Y Kolpashchikov, D M |
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Snippet | Eukaryotic flap-endonuclease (FEN-1) is 42-kD single-subunit structure-specific nuclease that cleaves 5'-flap strands of the branched DNA structure and... Eukaryotic flap-endonuclease (FEN-1) is 42-kD single-subunit structure-specific nuclease that cleaves 5"-flap strands of the branched DNA structure and... Eukaryotic flap-endonuclease (FEN-1) is 42-kD single-subunit structure-specific nuclease that cleaves 5QUOTATION_MARK-flap strands of the branched DNA... |
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SubjectTerms | Animals Deoxyribonucleic acid DNA DNA Polymerase beta - metabolism DNA Primers - genetics DNA Primers - metabolism DNA Repair DNA Replication Endodeoxyribonucleases - chemistry Endodeoxyribonucleases - metabolism Fibroblasts - metabolism Flap Endonucleases Labeling Mice Oligonucleotides - chemistry Oligonucleotides - metabolism Photoaffinity Labels - chemistry Photoaffinity Labels - metabolism Substrate Specificity |
Title | Affinity labeling of flap-endonuclease FEN-1 by photoreactive DNAs |
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