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Title: Mechanism of Ribonucleotide Incorporation by Human DNA Polymerase η

Journal Article · · Journal of Biological Chemistry
 [1];  [1];  [1]
  1. Vanderbilt Univ., Nashville, TN (United States)

Ribonucleotides and 2'-deoxyribonucleotides are the basic units for RNA and DNA, respectively, and the only difference is the extra 2'-OH group on the ribonucleotide sugar. Cellular rNTP concentrations are much higher than those of dNTP. When copying DNA, DNA polymerases not only select the base of the incoming dNTP to form a Watson-Crick pair with the template base but also distinguish the sugar moiety. Some DNA polymerases use a steric gate residue to prevent rNTP incorporation by creating a clash with the 2'-OH group. Y-family human DNA polymerase η (hpol η) is of interest because of its spacious active site (especially in the major groove) and tolerance of DNA lesions. Here, we show that hpol η maintains base selectivity when incorporating rNTPs opposite undamaged DNA and the DNA lesions 7,8-dihydro-8-oxo-2'-deoxyguanosine and cyclobutane pyrimidine dimer but with rates that are 103-fold lower than for inserting the corresponding dNTPs. X-ray crystal structures show that the hpol η scaffolds the incoming rNTP to pair with the template base (dG) or 7,8-dihydro-8-oxo-2'-deoxyguanosine with a significant propeller twist. As a result, the 2'-OH group avoids a clash with the steric gate, Phe-18, but the distance between primer end and Pα of the incoming rNTP increases by 1 Å, elevating the energy barrier and slowing polymerization compared with dNTP. In addition, Tyr-92 was identified as a second line of defense to maintain the position of Phe-18. Lastly, this is the first crystal structure of a DNA polymerase with an incoming rNTP opposite a DNA lesion.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Inst. of Health
Grant/Contract Number:
AC02-06CH11357; R01 ES010375; R01 ES010546; P01 CA160032
OSTI ID:
1243103
Journal Information:
Journal of Biological Chemistry, Vol. 291, Issue 8; ISSN 0021-9258
Publisher:
American Society for Biochemistry and Molecular BiologyCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (10)

Molecular and structural characterization of oxidized ribonucleotide insertion into DNA by human DNA polymerase β journal December 2019
Ribonucleotide discrimination by translesion synthesis DNA polymerases journal July 2018
Human DNA polymerase η accommodates RNA for strand extension journal September 2017
Mimivirus encodes a multifunctional primase with DNA/RNA polymerase, terminal transferase and translesion synthesis activities journal April 2019
A polar filter in DNA polymerases prevents ribonucleotide incorporation journal September 2019
Multifaceted activities of DNA polymerase η: beyond translesion DNA synthesis journal December 2018
Human DNA polymerase η has reverse transcriptase activity in cellular environments journal March 2019
Translesion synthesis DNA polymerase η exhibits a specific RNA extension activity and a transcription-associated function journal October 2017
Ribonucleotide incorporation by human DNA polymerase η impacts translesion synthesis and RNase H2 activity journal December 2016
Ribonucleotide incorporation by human DNA polymerase eta impacts translesion synthesis and RNase H2 activity text January 2017