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ATP driven structural changes of the bacterial Mre11:Rad50 catalytic head complex
DNA double-strand breaks (DSBs) threaten genome stability in all kingdoms of life and are linked to cancerogenic chromosome aberrations in humans. The Mre11:Rad50 (MR) complex is an evolutionarily conserved complex of two Rad50 ATPases and a dimer of the Mre11 nuclease that senses and processes DSBs...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3258140/ https://www.ncbi.nlm.nih.gov/pubmed/21937514 http://dx.doi.org/10.1093/nar/gkr749 |
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author | Möckel, Carolin Lammens, Katja Schele, Alexandra Hopfner, Karl-Peter |
author_facet | Möckel, Carolin Lammens, Katja Schele, Alexandra Hopfner, Karl-Peter |
author_sort | Möckel, Carolin |
collection | PubMed |
description | DNA double-strand breaks (DSBs) threaten genome stability in all kingdoms of life and are linked to cancerogenic chromosome aberrations in humans. The Mre11:Rad50 (MR) complex is an evolutionarily conserved complex of two Rad50 ATPases and a dimer of the Mre11 nuclease that senses and processes DSBs and tethers DNA for repair. ATP binding and hydrolysis by Rad50 is functionally coupled to DNA-binding and tethering, but also regulates Mre11's nuclease in processing DNA ends. To understand how ATP controls the interaction between Mre11 and Rad50, we determined the crystal structure of Thermotoga maritima (Tm) MR trapped in an ATP/ADP state. ATP binding to Rad50 induces a large structural change from an open form with accessible Mre11 nuclease sites into a closed form. Remarkably, the NBD dimer binds in the Mre11 DNA-binding cleft blocking Mre11's dsDNA-binding sites. An accompanying large swivel of the Rad50 coiled coil domains appears to prepare the coiled coils for DNA tethering. DNA-binding studies show that within the complex, Rad50 likely forms a dsDNA-binding site in response to ATP, while the Mre11 nuclease module retains a ssDNA-binding site. Our results suggest a possible mechanism for ATP-dependent DNA tethering and DSB processing by MR. |
format | Online Article Text |
id | pubmed-3258140 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-32581402012-01-17 ATP driven structural changes of the bacterial Mre11:Rad50 catalytic head complex Möckel, Carolin Lammens, Katja Schele, Alexandra Hopfner, Karl-Peter Nucleic Acids Res Structural Biology DNA double-strand breaks (DSBs) threaten genome stability in all kingdoms of life and are linked to cancerogenic chromosome aberrations in humans. The Mre11:Rad50 (MR) complex is an evolutionarily conserved complex of two Rad50 ATPases and a dimer of the Mre11 nuclease that senses and processes DSBs and tethers DNA for repair. ATP binding and hydrolysis by Rad50 is functionally coupled to DNA-binding and tethering, but also regulates Mre11's nuclease in processing DNA ends. To understand how ATP controls the interaction between Mre11 and Rad50, we determined the crystal structure of Thermotoga maritima (Tm) MR trapped in an ATP/ADP state. ATP binding to Rad50 induces a large structural change from an open form with accessible Mre11 nuclease sites into a closed form. Remarkably, the NBD dimer binds in the Mre11 DNA-binding cleft blocking Mre11's dsDNA-binding sites. An accompanying large swivel of the Rad50 coiled coil domains appears to prepare the coiled coils for DNA tethering. DNA-binding studies show that within the complex, Rad50 likely forms a dsDNA-binding site in response to ATP, while the Mre11 nuclease module retains a ssDNA-binding site. Our results suggest a possible mechanism for ATP-dependent DNA tethering and DSB processing by MR. Oxford University Press 2012-01 2011-09-21 /pmc/articles/PMC3258140/ /pubmed/21937514 http://dx.doi.org/10.1093/nar/gkr749 Text en © The Author(s) 2011. Published by Oxford University Press. http://creativecommons.org/licenses/by-nc/3.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Structural Biology Möckel, Carolin Lammens, Katja Schele, Alexandra Hopfner, Karl-Peter ATP driven structural changes of the bacterial Mre11:Rad50 catalytic head complex |
title | ATP driven structural changes of the bacterial Mre11:Rad50 catalytic head complex |
title_full | ATP driven structural changes of the bacterial Mre11:Rad50 catalytic head complex |
title_fullStr | ATP driven structural changes of the bacterial Mre11:Rad50 catalytic head complex |
title_full_unstemmed | ATP driven structural changes of the bacterial Mre11:Rad50 catalytic head complex |
title_short | ATP driven structural changes of the bacterial Mre11:Rad50 catalytic head complex |
title_sort | atp driven structural changes of the bacterial mre11:rad50 catalytic head complex |
topic | Structural Biology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3258140/ https://www.ncbi.nlm.nih.gov/pubmed/21937514 http://dx.doi.org/10.1093/nar/gkr749 |
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