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Structural basis of 5′ flap recognition and protein–protein interactions of human flap endonuclease 1

Human flap endonuclease 1 (hFEN1) is a structure-specific nuclease essential for DNA replication and repair processes. hFEN1 has 5′ flap removal activity, as well as gap endonuclease activity that is critical for restarting stalled replication forks. Here, we report the crystal structures of wild-ty...

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Autores principales: Xu, Hong, Shi, Rongyi, Han, Wanchun, Cheng, Jiahui, Xu, Xiaoli, Cheng, Kaiying, Wang, Liangyan, Tian, Bing, Zheng, Li, Shen, Binghui, Hua, Yuejin, Zhao, Ye
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265464/
https://www.ncbi.nlm.nih.gov/pubmed/30295841
http://dx.doi.org/10.1093/nar/gky911
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author Xu, Hong
Shi, Rongyi
Han, Wanchun
Cheng, Jiahui
Xu, Xiaoli
Cheng, Kaiying
Wang, Liangyan
Tian, Bing
Zheng, Li
Shen, Binghui
Hua, Yuejin
Zhao, Ye
author_facet Xu, Hong
Shi, Rongyi
Han, Wanchun
Cheng, Jiahui
Xu, Xiaoli
Cheng, Kaiying
Wang, Liangyan
Tian, Bing
Zheng, Li
Shen, Binghui
Hua, Yuejin
Zhao, Ye
author_sort Xu, Hong
collection PubMed
description Human flap endonuclease 1 (hFEN1) is a structure-specific nuclease essential for DNA replication and repair processes. hFEN1 has 5′ flap removal activity, as well as gap endonuclease activity that is critical for restarting stalled replication forks. Here, we report the crystal structures of wild-type and mutant hFEN1 proteins in complex with DNA substrates, followed by mutagenesis studies that provide mechanistic insight into the protein–protein interactions of hFEN1. We found that in an α-helix forming the helical gateway of hFEN1 recognizes the 5′ flap prior to its threading into the active site for cleavage. We also found that the β-pin region is rigidified into a short helix in R192F hFEN1–DNA structures, suppressing its gap endonuclease activity and cycle-dependent kinase interactions. Our findings suggest that a single mutation at the primary methylation site can alter the function of hFEN1 and provide insight into the role of the β-pin region in hFEN1 protein interactions that are essential for DNA replication and repair.
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spelling pubmed-62654642018-12-04 Structural basis of 5′ flap recognition and protein–protein interactions of human flap endonuclease 1 Xu, Hong Shi, Rongyi Han, Wanchun Cheng, Jiahui Xu, Xiaoli Cheng, Kaiying Wang, Liangyan Tian, Bing Zheng, Li Shen, Binghui Hua, Yuejin Zhao, Ye Nucleic Acids Res Genome Integrity, Repair and Replication Human flap endonuclease 1 (hFEN1) is a structure-specific nuclease essential for DNA replication and repair processes. hFEN1 has 5′ flap removal activity, as well as gap endonuclease activity that is critical for restarting stalled replication forks. Here, we report the crystal structures of wild-type and mutant hFEN1 proteins in complex with DNA substrates, followed by mutagenesis studies that provide mechanistic insight into the protein–protein interactions of hFEN1. We found that in an α-helix forming the helical gateway of hFEN1 recognizes the 5′ flap prior to its threading into the active site for cleavage. We also found that the β-pin region is rigidified into a short helix in R192F hFEN1–DNA structures, suppressing its gap endonuclease activity and cycle-dependent kinase interactions. Our findings suggest that a single mutation at the primary methylation site can alter the function of hFEN1 and provide insight into the role of the β-pin region in hFEN1 protein interactions that are essential for DNA replication and repair. Oxford University Press 2018-11-30 2018-10-08 /pmc/articles/PMC6265464/ /pubmed/30295841 http://dx.doi.org/10.1093/nar/gky911 Text en © The Author(s) 2018. Published by Oxford University Press on behalf of Nucleic Acids Research. http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
spellingShingle Genome Integrity, Repair and Replication
Xu, Hong
Shi, Rongyi
Han, Wanchun
Cheng, Jiahui
Xu, Xiaoli
Cheng, Kaiying
Wang, Liangyan
Tian, Bing
Zheng, Li
Shen, Binghui
Hua, Yuejin
Zhao, Ye
Structural basis of 5′ flap recognition and protein–protein interactions of human flap endonuclease 1
title Structural basis of 5′ flap recognition and protein–protein interactions of human flap endonuclease 1
title_full Structural basis of 5′ flap recognition and protein–protein interactions of human flap endonuclease 1
title_fullStr Structural basis of 5′ flap recognition and protein–protein interactions of human flap endonuclease 1
title_full_unstemmed Structural basis of 5′ flap recognition and protein–protein interactions of human flap endonuclease 1
title_short Structural basis of 5′ flap recognition and protein–protein interactions of human flap endonuclease 1
title_sort structural basis of 5′ flap recognition and protein–protein interactions of human flap endonuclease 1
topic Genome Integrity, Repair and Replication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265464/
https://www.ncbi.nlm.nih.gov/pubmed/30295841
http://dx.doi.org/10.1093/nar/gky911
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