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Poly(ADP-ribose) polymerases (PARPs) modify proteins, but their specific targets and functions, especially for PARP7 and PARP10, remain unclear. This review explores PARP specificity and identifies future research directions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Post-translational modifications regulate cellular functions, with ADP-ribosylation by poly(ADP-ribose) polymerases (PARPs) being crucial for cell health.
  • PARPs can transfer single ADP-ribose (MARylation) or poly(ADP-ribose) (PAR) chains to various amino acid residues, expanding beyond traditional targets like arginine and glutamate.
  • While PARP1's function is well-studied, the roles and specific targets of other PARPs, such as PARP7 and PARP10, are less understood.

Purpose of the Study:

  • To review the current understanding of PARP enzyme specificity in vitro and in cellular contexts.
  • To highlight the expanding repertoire of amino acid residues modified by ADP-ribosylation.
  • To identify knowledge gaps and propose future research directions for elucidating PARP functions.

Main Methods:

  • Literature review of existing studies on PARP enzymatic activity and substrate specificity.
  • Analysis of recent findings on novel ADP-ribose acceptor amino acids.
  • Discussion of known and unknown hydrolases involved in reversing ADP-ribosylation.

Main Results:

  • ADP-ribosylation occurs on a wider range of amino acids than previously thought, including serine, tyrosine, and histidine.
  • Specific hydrolases like ARH1, ARH3, MACROD1, MACROD2, and TARG1 reverse ADP-ribosylation on certain residues, but not all.
  • The endogenous targets and precise biological functions of many PARP family members remain to be identified.

Conclusions:

  • Further research is needed to identify the endogenous targets of various PARPs.
  • Understanding the biochemical reactions and specificities of PARPs is essential for deciphering their roles in cellular processes.
  • Elucidating PARP functions will advance our knowledge of cell health maintenance and disease mechanisms.