Dissecting PCNA function with a systematically designed mutant library in yeast

J Genet Genomics. 2019 Jun 20;46(6):301-313. doi: 10.1016/j.jgg.2019.03.014. Epub 2019 Jun 24.

Abstract

Proliferating cell nuclear antigen (PCNA), encoded by POL30 in Saccharomyces cerevisiae, is a key component of DNA metabolism. Here, a library consisting of 304 PCNA mutants was designed and constructed to probe the contribution of each residue to the biological function of PCNA. Five regions with elevated sensitivity to DNA damaging reagents were identified using high-throughput phenotype screening. Using a series of genetic and biochemical analyses, we demonstrated that one particular mutant, K168A, has defects in the DNA damage tolerance (DDT) pathway by disrupting the interaction between PCNA and Rad5. Subsequent domain analysis showed that the PCNA-Rad5 interaction is a prerequisite for the function of Rad5 in DDT. Our study not only provides a resource in the form of a library of versatile mutants to study the functions of PCNA, but also reveals a key residue on PCNA (K168) which highlights the importance of the PCNA-Rad5 interaction in the template switching (TS) pathway.

Keywords: DNA damage tolerance; Genetic interaction; High-throughput; Mutagenesis; Template switching.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • DNA Damage
  • DNA Helicases / metabolism
  • Gene Library*
  • Models, Molecular
  • Mutation*
  • Proliferating Cell Nuclear Antigen / chemistry
  • Proliferating Cell Nuclear Antigen / genetics*
  • Proliferating Cell Nuclear Antigen / metabolism*
  • Protein Conformation
  • Protein Processing, Post-Translational
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae Proteins / chemistry
  • Saccharomyces cerevisiae Proteins / genetics*
  • Saccharomyces cerevisiae Proteins / metabolism*

Substances

  • Proliferating Cell Nuclear Antigen
  • Saccharomyces cerevisiae Proteins
  • RAD5 protein, S cerevisiae
  • DNA Helicases