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Title: Crystal structures of a natural DNA polymerase that functions as an XNA reverse transcriptase

Abstract

Abstract Replicative DNA polymerases are highly efficient enzymes that maintain stringent geometric control over shape and orientation of the template and incoming nucleoside triphosphate. In a surprising twist to this paradigm, a naturally occurring bacterial DNA polymerase I member isolated from Geobacillus stearothermophilus (Bst) exhibits an innate ability to reverse transcribe RNA and other synthetic congeners (XNAs) into DNA. This observation raises the interesting question of how a replicative DNA polymerase is able to recognize templates of diverse chemical composition. Here, we present crystal structures of natural Bst DNA polymerase that capture the post-translocated product of DNA synthesis on templates composed entirely of 2′-deoxy-2′-fluoro-β-d-arabino nucleic acid (FANA) and α-l-threofuranosyl nucleic acid (TNA). Analysis of the enzyme active site reveals the importance of structural plasticity as a possible mechanism for XNA-dependent DNA synthesis and provides insights into the construction of variants with improved activity.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [2]
  1. Departments of Pharmaceutical Sciences, University of California, Irvine, CA 92697-3958, USA
  2. Departments of Pharmaceutical Sciences, University of California, Irvine, CA 92697-3958, USA, Department of Chemistry, University of California, Irvine, CA 92697-3958, USA, Department of Molecular Biology and Biochemistry, University of California, CA 92697-3958, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1525514
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Nucleic Acids Research
Additional Journal Information:
Journal Name: Nucleic Acids Research Journal Volume: 47 Journal Issue: 13; Journal ID: ISSN 0305-1048
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Jackson, Lynnette N., Chim, Nicholas, Shi, Changhua, and Chaput, John C. Crystal structures of a natural DNA polymerase that functions as an XNA reverse transcriptase. United Kingdom: N. p., 2019. Web. doi:10.1093/nar/gkz513.
Jackson, Lynnette N., Chim, Nicholas, Shi, Changhua, & Chaput, John C. Crystal structures of a natural DNA polymerase that functions as an XNA reverse transcriptase. United Kingdom. https://doi.org/10.1093/nar/gkz513
Jackson, Lynnette N., Chim, Nicholas, Shi, Changhua, and Chaput, John C. Thu . "Crystal structures of a natural DNA polymerase that functions as an XNA reverse transcriptase". United Kingdom. https://doi.org/10.1093/nar/gkz513.
@article{osti_1525514,
title = {Crystal structures of a natural DNA polymerase that functions as an XNA reverse transcriptase},
author = {Jackson, Lynnette N. and Chim, Nicholas and Shi, Changhua and Chaput, John C.},
abstractNote = {Abstract Replicative DNA polymerases are highly efficient enzymes that maintain stringent geometric control over shape and orientation of the template and incoming nucleoside triphosphate. In a surprising twist to this paradigm, a naturally occurring bacterial DNA polymerase I member isolated from Geobacillus stearothermophilus (Bst) exhibits an innate ability to reverse transcribe RNA and other synthetic congeners (XNAs) into DNA. This observation raises the interesting question of how a replicative DNA polymerase is able to recognize templates of diverse chemical composition. Here, we present crystal structures of natural Bst DNA polymerase that capture the post-translocated product of DNA synthesis on templates composed entirely of 2′-deoxy-2′-fluoro-β-d-arabino nucleic acid (FANA) and α-l-threofuranosyl nucleic acid (TNA). Analysis of the enzyme active site reveals the importance of structural plasticity as a possible mechanism for XNA-dependent DNA synthesis and provides insights into the construction of variants with improved activity.},
doi = {10.1093/nar/gkz513},
journal = {Nucleic Acids Research},
number = 13,
volume = 47,
place = {United Kingdom},
year = {2019},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1093/nar/gkz513

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Cited by: 4 works
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