- EMDB-15417: human MutSalpha (MSH2/MSH6) binding to DNA with a GT mismatch -
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Basic information
Entry
Database: EMDB / ID: EMD-15417
Title
human MutSalpha (MSH2/MSH6) binding to DNA with a GT mismatch
Map data
Sample
Complex: MutSalpha on mismatched DNA
Complex: MSH2
Protein or peptide: DNA mismatch repair protein Msh2
Complex: MSH6
Protein or peptide: DNA mismatch repair protein Msh6
Complex: DNA containing a G/T mismatch
DNA: DNA (50-MER)
DNA: DNA (50-MER)
Ligand: MAGNESIUM ION
Ligand: ADENOSINE-5'-DIPHOSPHATE
Keywords
DNA mismatch repair / MMR / MutSa / Lynch Syndrome / DNA BINDING PROTEIN
Function / homology
Function and homology information
somatic recombination of immunoglobulin genes involved in immune response / MutSbeta complex / Defective Mismatch Repair Associated With MSH3 / MutSalpha complex / Defective Mismatch Repair Associated With MSH2 / Defective Mismatch Repair Associated With MSH6 / positive regulation of helicase activity / guanine/thymine mispair binding / somatic recombination of immunoglobulin gene segments / B cell mediated immunity ...somatic recombination of immunoglobulin genes involved in immune response / MutSbeta complex / Defective Mismatch Repair Associated With MSH3 / MutSalpha complex / Defective Mismatch Repair Associated With MSH2 / Defective Mismatch Repair Associated With MSH6 / positive regulation of helicase activity / guanine/thymine mispair binding / somatic recombination of immunoglobulin gene segments / B cell mediated immunity / maintenance of DNA repeat elements / meiotic mismatch repair / positive regulation of isotype switching to IgA isotypes / centromeric DNA binding / positive regulation of isotype switching to IgG isotypes / mitotic recombination / mismatched DNA binding / negative regulation of DNA recombination / isotype switching / Mismatch repair (MMR) directed by MSH2:MSH3 (MutSbeta) / Mismatch repair (MMR) directed by MSH2:MSH6 (MutSalpha) / response to UV-B / postreplication repair / oxidative phosphorylation / mitotic intra-S DNA damage checkpoint signaling / ATP-dependent DNA damage sensor activity / germ cell development / ATP-dependent activity, acting on DNA / response to X-ray / intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator / somatic hypermutation of immunoglobulin genes / mismatch repair / response to UV / protein localization to chromatin / methylated histone binding / B cell differentiation / intrinsic apoptotic signaling pathway / determination of adult lifespan / TP53 Regulates Transcription of DNA Repair Genes / intrinsic apoptotic signaling pathway in response to DNA damage / male gonad development / double-strand break repair / spermatogenesis / in utero embryonic development / negative regulation of neuron apoptotic process / damaged DNA binding / chromosome, telomeric region / intracellular membrane-bounded organelle / DNA repair / chromatin binding / chromatin / enzyme binding / Golgi apparatus / protein homodimerization activity / ATP hydrolysis activity / DNA binding / nucleoplasm / ATP binding / nucleus / membrane / cytosol Similarity search - Function
DNA mismatch repair Msh2-type / DNA mismatch repair protein Msh2 / DNA mismatch repair protein MutS/MSH / DNA mismatch repair protein MutS-like, N-terminal / DNA mismatch repair protein MutS, connector domain / DNA mismatch repair protein MutS, clamp / DNA mismatch repair protein MutS, N-terminal / MutS, connector domain superfamily / MutS domain I / MutS domain II ...DNA mismatch repair Msh2-type / DNA mismatch repair protein Msh2 / DNA mismatch repair protein MutS/MSH / DNA mismatch repair protein MutS-like, N-terminal / DNA mismatch repair protein MutS, connector domain / DNA mismatch repair protein MutS, clamp / DNA mismatch repair protein MutS, N-terminal / MutS, connector domain superfamily / MutS domain I / MutS domain II / MutS family domain IV / MutS domain III / DNA mismatch repair MutS family / DNA mismatch repair protein MutS, C-terminal / DNA mismatch repair protein MutS, core / DNA mismatch repair protein MutS, core domain superfamily / MutS domain V / DNA mismatch repair proteins mutS family signature. / DNA-binding domain of DNA mismatch repair MUTS family / ATPase domain of DNA mismatch repair MUTS family / domain with conserved PWWP motif / PWWP domain / PWWP domain profile. / PWWP domain / P-loop containing nucleoside triphosphate hydrolase Similarity search - Domain/homology
Netherlands Organisation for Scientific Research (NWO)
NOW-TOP 714.016.002
Netherlands
European Commission
H2020-MSCA-ITN-2016 722433 DNAREPAIRMAN
European Union
Citation
Journal: Nucleic Acids Res / Year: 2023 Title: Unexpected moves: a conformational change in MutSα enables high-affinity DNA mismatch binding. Authors: Susanne R Bruekner / Wietske Pieters / Alexander Fish / A Manuel Liaci / Serge Scheffers / Emily Rayner / Daphne Kaldenbach / Lisa Drost / Marleen Dekker / Sandrine van Hees-Stuivenberg / ...Authors: Susanne R Bruekner / Wietske Pieters / Alexander Fish / A Manuel Liaci / Serge Scheffers / Emily Rayner / Daphne Kaldenbach / Lisa Drost / Marleen Dekker / Sandrine van Hees-Stuivenberg / Elly Delzenne-Goette / Charlotte de Konink / Hellen Houlleberghs / Hendrikus Jan Dubbink / Abeer AlSaegh / Niels de Wind / Friedrich Förster / Hein Te Riele / Titia K Sixma / Abstract: The DNA mismatch repair protein MutSα recognizes wrongly incorporated DNA bases and initiates their correction during DNA replication. Dysfunctions in mismatch repair lead to a predisposition to ...The DNA mismatch repair protein MutSα recognizes wrongly incorporated DNA bases and initiates their correction during DNA replication. Dysfunctions in mismatch repair lead to a predisposition to cancer. Here, we study the homozygous mutation V63E in MSH2 that was found in the germline of a patient with suspected constitutional mismatch repair deficiency syndrome who developed colorectal cancer before the age of 30. Characterization of the mutant in mouse models, as well as slippage and repair assays, shows a mildly pathogenic phenotype. Using cryogenic electron microscopy and surface plasmon resonance, we explored the mechanistic effect of this mutation on MutSα function. We discovered that V63E disrupts a previously unappreciated interface between the mismatch binding domains (MBDs) of MSH2 and MSH6 and leads to reduced DNA binding. Our research identifies this interface as a 'safety lock' that ensures high-affinity DNA binding to increase replication fidelity. Our mechanistic model explains the hypomorphic phenotype of the V63E patient mutation and other variants in the MBD interface.
Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 45 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.01 kPa
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV / Details: 3 s blotting with blot force 10.
Details
2 uM MutSa with 2-fold excess DNA oligo
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Electron microscopy
Microscope
FEI TITAN KRIOS
Details
collected on Krios 1 at Netherlands Center for Electron Nanoscopy (NeCEN)
Image recording
Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 4821 / Average exposure time: 1.9 sec. / Average electron dose: 50.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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