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Structure and function of Pif1 helicase.

Alicia K Byrd1, Kevin D Raney1

  • 1Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, Little Rock, AR 72205, U.S.A. akbyrd@uams.edu raneykevind@uams.edu.

Biochemical Society Transactions
|September 14, 2017
PubMed
Summary
This summary is machine-generated.

Pif1 helicases maintain DNA integrity by resolving replication roadblocks like G-quadruplexes. Recent structural and biochemical studies illuminate their diverse roles in DNA replication and repair.

Keywords:
DNAG-quadruplexenzyme kineticsenzyme–substrate interactionshelicasemtDNA

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Pif1 helicases are crucial for maintaining genome stability in eukaryotes.
  • In Saccharomyces cerevisiae, Pif1 and Rrm3 resolve replication barriers, including G-quadruplexes and protein blocks.
  • ScPif1 also impacts telomerase regulation, Okazaki fragment processing, and DNA repair.

Purpose of the Study:

  • To review recent structural and biochemical studies on Pif1 helicases.
  • To elucidate the proposed mechanisms underlying Pif1's diverse DNA-related activities.

Main Methods:

  • Analysis of recent crystal structures of bacterial and human Pif1 helicases.
  • Integration of biochemical and biological data on Pif1 helicase functions.

Main Results:

  • Structural insights into bacterial Pif1 and the human PIF1 helicase domain have been obtained.
  • Biochemical and biological studies reveal Pif1's roles in resolving replication obstacles and maintaining DNA integrity.

Conclusions:

  • Pif1 family helicases play multifaceted roles in DNA maintenance.
  • Understanding Pif1 structures and activities is key to comprehending DNA replication and repair mechanisms.