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Title: Single-molecule FRET unveils induced-fit mechanism for substrate selectivity in flap endonuclease 1

Journal Article · · eLife
DOI:https://doi.org/10.7554/eLife.21884· OSTI ID:1347470
 [1];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [1];  [3];  [2];  [4];  [1]; ORCiD logo [1]
  1. Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
  2. Department of Chemistry, Georgia State University, Atlanta, United States, Center for Diagnostics and Therapeutics, Georgia State University, Atlanta, United States
  3. Lawrence Berkeley National Laboratory, Berkeley, United States
  4. Lawrence Berkeley National Laboratory, Berkeley, United States, Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, United States

Human flap endonuclease 1 (FEN1) and related structure-specific 5’nucleases precisely identify and incise aberrant DNA structures during replication, repair and recombination to avoid genomic instability. Yet, it is unclear how the 5’nuclease mechanisms of DNA distortion and protein ordering robustly mediate efficient and accurate substrate recognition and catalytic selectivity. Here, single-molecule sub-millisecond and millisecond analyses of FEN1 reveal a protein-DNA induced-fit mechanism that efficiently verifies substrate and suppresses off-target cleavage. FEN1 sculpts DNA with diffusion-limited kinetics to test DNA substrate. This DNA distortion mutually ‘locks’ protein and DNA conformation and enables substrate verification with extreme precision. Strikingly, FEN1 never misses cleavage of its cognate substrate while blocking probable formation of catalytically competent interactions with noncognate substrates and fostering their pre-incision dissociation. These findings establish FEN1 has practically perfect precision and that separate control of induced-fit substrate recognition sets up the catalytic selectivity of the nuclease active site for genome stability.

Research Organization:
Lawrence Berkeley National Lab (LBNL) Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); King Abdullah University of Science and Technology; National Science Foundation (NSF); National Institutes of Health (NIH) Clinical Center
Grant/Contract Number:
AC02-05CH11231; 2201 CRG3; MCB-1149521; R01GM110387
OSTI ID:
1347470
Alternate ID(s):
OSTI ID: 1347471; OSTI ID: 1628865
Journal Information:
eLife, Journal Name: eLife Vol. 6; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (10)

Computational study on the selective inhibition mechanism of MS402 to the first and second bromodomains of BRD4 journal November 2018
Phosphate steering by Flap Endonuclease 1 promotes 5′-flap specificity and incision to prevent genome instability journal June 2017
Initial state of DNA-Dye complex sets the stage for protein induced fluorescence modulation journal May 2019
Structure of the processive human Pol δ holoenzyme journal February 2020
A bio-hybrid DNA rotor–stator nanoengine that moves along predefined tracks journal April 2018
Positioning the 5′-flap junction in the active site controls the rate of flap endonuclease-1–catalyzed DNA cleavage journal February 2018
Missed cleavage opportunities by FEN1 lead to Okazaki fragment maturation via the long-flap pathway journal February 2018
ERASE: a novel surface reconditioning strategy for single-molecule experiments journal November 2018
Resolution of the Holliday junction recombination intermediate by human GEN1 at the single-molecule level journal December 2018
A conserved loop–wedge motif moderates reaction site search and recognition by FEN1 journal June 2018