Research output: Contribution to journal › Article › peer-review
The impact of single-nucleotide polymorphisms of human apurinic/apyrimidinic endonuclease 1 on specific DNA binding and catalysis. / Alekseeva, Irina V.; Davletgildeeva, Anastasiia T.; Arkova, Olga V. et al.
In: Biochimie, Vol. 163, 01.08.2019, p. 73-83.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - The impact of single-nucleotide polymorphisms of human apurinic/apyrimidinic endonuclease 1 on specific DNA binding and catalysis
AU - Alekseeva, Irina V.
AU - Davletgildeeva, Anastasiia T.
AU - Arkova, Olga V.
AU - Kuznetsov, Nikita A.
AU - Fedorova, Olga S.
N1 - Copyright © 2019 Elsevier B.V. and Société Française de Biochimie et Biologie Moléculaire (SFBBM). All rights reserved.
PY - 2019/8/1
Y1 - 2019/8/1
N2 - Human apurinic/apyrimidinic (AP) endonuclease APE1 is a crucial enzyme of the base excision repair (BER) pathway, which is in charge of recognition and initiation of removal of AP-sites in DNA. It is known that some single-nucleotide polymorphism (SNP) variants of APE1 have a reduced activity as compared to wild-type APE1. It has been hypothesized that genetic variation in APE1 might be responsible for an increased risk of some types of cancer. In the present work, analysis of SNPs of the APE1 gene was performed to select the set of variants having substitutions of amino acid residues on the surface of the enzyme globule and in the DNA-binding site, thereby affecting protein–protein interactions or the catalytic reaction, respectively. For seven APE1 variants (R221C, N222H, R237A, G241R, M270T, R274Q, and P311S), conformational dynamics and catalytic activities were examined. The conformational changes in the molecules of APE1 variants and in a DNA substrate were recorded as fluorescence changes of Trp and 2-aminopurine residues, respectively, using the stopped-flow technique. The results made it possible to determine the kinetic mechanism underlying the interactions of the APE1 variants with DNA substrates, to calculate the rate constants of the elementary stages, and to identify the stages of the process affected by mutation.
AB - Human apurinic/apyrimidinic (AP) endonuclease APE1 is a crucial enzyme of the base excision repair (BER) pathway, which is in charge of recognition and initiation of removal of AP-sites in DNA. It is known that some single-nucleotide polymorphism (SNP) variants of APE1 have a reduced activity as compared to wild-type APE1. It has been hypothesized that genetic variation in APE1 might be responsible for an increased risk of some types of cancer. In the present work, analysis of SNPs of the APE1 gene was performed to select the set of variants having substitutions of amino acid residues on the surface of the enzyme globule and in the DNA-binding site, thereby affecting protein–protein interactions or the catalytic reaction, respectively. For seven APE1 variants (R221C, N222H, R237A, G241R, M270T, R274Q, and P311S), conformational dynamics and catalytic activities were examined. The conformational changes in the molecules of APE1 variants and in a DNA substrate were recorded as fluorescence changes of Trp and 2-aminopurine residues, respectively, using the stopped-flow technique. The results made it possible to determine the kinetic mechanism underlying the interactions of the APE1 variants with DNA substrates, to calculate the rate constants of the elementary stages, and to identify the stages of the process affected by mutation.
KW - Abasic site
KW - DNA repair
KW - Fluorescence
KW - Human apurinic/apyrimidinic endonuclease
KW - Stopped-flow enzyme kinetics
KW - RECOGNITION
KW - ACTIVE-SITE
KW - BIOLOGICAL CONSEQUENCES
KW - Human apurinic/apyrimidinic endonudease
KW - CONFORMATIONAL DYNAMICS
KW - 2-AMINOPURINE
KW - DAMAGE
KW - BASE EXCISION-REPAIR
KW - FLUORESCENCE
KW - DIVALENT METAL-IONS
KW - HUMAN AP ENDONUCLEASE
KW - DNA/metabolism
KW - Humans
KW - Substrate Specificity
KW - DNA-(Apurinic or Apyrimidinic Site) Lyase/chemistry
KW - Models, Molecular
KW - DNA Repair
KW - Protein Conformation
KW - Polymorphism, Single Nucleotide
KW - DNA Damage
KW - Kinetics
KW - Mutation
UR - http://www.scopus.com/inward/record.url?scp=85066463017&partnerID=8YFLogxK
U2 - 10.1016/j.biochi.2019.05.015
DO - 10.1016/j.biochi.2019.05.015
M3 - Article
C2 - 31150756
AN - SCOPUS:85066463017
VL - 163
SP - 73
EP - 83
JO - Biochimie
JF - Biochimie
SN - 0300-9084
ER -
ID: 20343766