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PARP1 Val762Ala polymorphism reduces enzymatic activity.

Xiao-Gan Wang1, Zhao-Qi Wang, Wei-Min Tong

  • 1National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences (CAMS) and Peking Union Medical College (PUMC), 5 Dong Dan San Tiao, 100005 Beijing, PR China.

Biochemical and Biophysical Research Communications
|January 12, 2007
PubMed
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The common Val762Ala polymorphism in Poly(ADP-ribose) polymerase 1 (PARP1) reduces its enzymatic activity. This diminished activity of PARP1 may influence cancer susceptibility in carriers.

Area of Science:

  • Molecular Biology
  • Enzymology
  • Genetics

Background:

  • Poly(ADP-ribose) polymerase 1 (PARP1) is crucial for DNA repair and cellular processes.
  • A frequent single nucleotide polymorphism (SNP) in PARP1 (Val762Ala) is linked to cancer susceptibility.

Purpose of the Study:

  • To investigate the functional impact of the PARP1 Val762Ala polymorphism on enzyme activity.
  • To elucidate the biochemical mechanism by which this polymorphism affects PARP1 function.

Main Methods:

  • In vitro enzymatic assays were conducted using both wild-type (PARP1-Val762) and polymorphic (PARP1-Ala762) forms of the enzyme.
  • Kinetic analysis, including determination of K(m) values, was performed for auto- and trans-poly(ADP-ribosyl)ation reactions.

Main Results:

Related Experiment Videos

  • PARP1-Ala762 exhibited significantly reduced enzymatic activity compared to PARP1-Val762.
  • Specifically, PARP1-Ala762 showed 57.2% auto-poly(ADP-ribosyl)ation and 61.9% trans-poly(ADP-ribosyl)ation activity.
  • Kinetic analysis revealed a 1.2-fold increase in K(m) for PARP1-Ala762, indicating reduced substrate binding affinity.

Conclusions:

  • The PARP1 Val762Ala polymorphism impairs PARP1 enzymatic function by decreasing its catalytic efficiency.
  • Altered poly(ADP-ribosyl)ation levels due to this polymorphism may contribute to variations in cancer risk among individuals.