Recombination / DNA repair / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex
Function / homology
Function and homology information
DNA polymerase V complex / homologous recombination / recombinational repair / ATP-dependent DNA damage sensor activity / response to ionizing radiation / SOS response / ATP-dependent activity, acting on DNA / translesion synthesis / cell motility / single-stranded DNA binding ...DNA polymerase V complex / homologous recombination / recombinational repair / ATP-dependent DNA damage sensor activity / response to ionizing radiation / SOS response / ATP-dependent activity, acting on DNA / translesion synthesis / cell motility / single-stranded DNA binding / DNA-binding transcription factor binding / DNA recombination / damaged DNA binding / DNA repair / DNA damage response / ATP hydrolysis activity / ATP binding / cytosol / cytoplasm Similarity search - Function
: / : / RecA C-terminal domain / DNA recombination/repair protein RecA, conserved site / DNA recombination and repair protein RecA, C-terminal / recA signature. / DNA recombination and repair protein RecA / recA bacterial DNA recombination protein / DNA recombination and repair protein RecA, monomer-monomer interface / RecA family profile 2. ...: / : / RecA C-terminal domain / DNA recombination/repair protein RecA, conserved site / DNA recombination and repair protein RecA, C-terminal / recA signature. / DNA recombination and repair protein RecA / recA bacterial DNA recombination protein / DNA recombination and repair protein RecA, monomer-monomer interface / RecA family profile 2. / DNA recombination and repair protein RecA-like, ATP-binding domain / RecA family profile 1. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase Similarity search - Domain/homology
Journal: Nature / Year: 2020 Title: Mechanism of strand exchange from RecA-DNA synaptic and D-loop structures. Authors: Haijuan Yang / Chun Zhou / Ankita Dhar / Nikola P Pavletich / Abstract: The strand-exchange reaction is central to homologous recombination. It is catalysed by the RecA family of ATPases, which form a helical filament with single-stranded DNA (ssDNA) and ATP. This ...The strand-exchange reaction is central to homologous recombination. It is catalysed by the RecA family of ATPases, which form a helical filament with single-stranded DNA (ssDNA) and ATP. This filament binds to a donor double-stranded DNA (dsDNA) to form synaptic filaments, which search for homology and then catalyse the exchange of the complementary strand, forming either a new heteroduplex or-if homology is limited-a D-loop. How synaptic filaments form, search for homology and catalyse strand exchange is poorly understood. Here we report the cryo-electron microscopy analysis of synaptic mini-filaments with both non-complementary and partially complementary dsDNA, and structures of RecA-D-loop complexes containing a 10- or a 12-base-pair heteroduplex. The C-terminal domain of RecA binds to dsDNA and directs it to the RecA L2 loop, which inserts into and opens up the duplex. The opening propagates through RecA sequestering the homologous strand at a secondary DNA-binding site, which frees the complementary strand to sample pairing with the ssDNA. At each RecA step, there is a roughly 20% probability that duplex opening will terminate and the as-yet-unopened dsDNA portion will bind to another C-terminal domain. Homology suppresses this process, through the cooperation of heteroduplex pairing with the binding of ssDNA to the secondary site, to extend dsDNA opening. This mechanism locally limits the length of ssDNA sampled for pairing if homology is not encountered, and could allow for the formation of multiple, widely separated synapses on the donor dsDNA, which would increase the likelihood of encountering homology. These findings provide key mechanistic insights into homologous recombination.
History
Deposition
Aug 29, 2020
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Header (metadata) release
Nov 4, 2020
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Map release
Nov 4, 2020
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Update
Mar 6, 2024
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Current status
Mar 6, 2024
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Supramolecule #1: Ensemble of products of a strand exchange reaction with partially...
Supramolecule
Name: Ensemble of products of a strand exchange reaction with partially-homologous 67 bp dsDNA and ATPgammaS type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)
Organism: Escherichia coli (E. coli)
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Macromolecule #1: Protein RecA
Macromolecule
Name: Protein RecA / type: protein_or_peptide / ID: 1 / Number of copies: 9 / Enantiomer: LEVO
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