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Structural and mechanistic insights into the MCM8/9 helicase complex. 2023

Zhuangfeng Weng, and Jiefu Zheng, and Yiyi Zhou, and Zuer Lu, and Yixi Wu, and Dongyi Xu, and Huanhuan Li, and Huanhuan Liang, and Yingfang Liu
Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China.

MCM8 and MCM9 form a functional helicase complex (MCM8/9) that plays an essential role in DNA homologous recombination repair for DNA double-strand break. However, the structural characterization of MCM8/9 for DNA binding/unwinding remains unclear. Here, we report structures of the MCM8/9 complex using cryo-electron microscopy single particle analysis. The structures reveal that MCM8/9 is arranged into a heterohexamer through a threefold symmetry axis, creating a central channel that accommodates DNA. Multiple characteristic hairpins from the N-terminal oligosaccharide/oligonucleotide (OB) domains of MCM8/9 protrude into the central channel and serve to unwind the duplex DNA. When activated by HROB, the structure of MCM8/9's N-tier ring converts its symmetry from C3 to C1 with a conformational change that expands the MCM8/9's trimer interface. Moreover, our structural dynamic analyses revealed that the flexible C-tier ring exhibited rotary motions relative to the N-tier ring, which is required for the unwinding ability of MCM8/9. In summary, our structural and biochemistry study provides a basis for understanding the DNA unwinding mechanism of MCM8/9 helicase in homologous recombination.

UI MeSH Term Description Entries
D004247 DNA A deoxyribonucleotide polymer that is the primary genetic material of all cells. Eukaryotic and prokaryotic organisms normally contain DNA in a double-stranded state, yet several important biological processes transiently involve single-stranded regions. DNA, which consists of a polysugar-phosphate backbone possessing projections of purines (adenine and guanine) and pyrimidines (thymine and cytosine), forms a double helix that is held together by hydrogen bonds between these purines and pyrimidines (adenine to thymine and guanine to cytosine). DNA, Double-Stranded,Deoxyribonucleic Acid,ds-DNA,DNA, Double Stranded,Double-Stranded DNA,ds DNA
D004268 DNA-Binding Proteins Proteins which bind to DNA. The family includes proteins which bind to both double- and single-stranded DNA and also includes specific DNA binding proteins in serum which can be used as markers for malignant diseases. DNA Helix Destabilizing Proteins,DNA-Binding Protein,Single-Stranded DNA Binding Proteins,DNA Binding Protein,DNA Single-Stranded Binding Protein,SS DNA BP,Single-Stranded DNA-Binding Protein,Binding Protein, DNA,DNA Binding Proteins,DNA Single Stranded Binding Protein,DNA-Binding Protein, Single-Stranded,Protein, DNA-Binding,Single Stranded DNA Binding Protein,Single Stranded DNA Binding Proteins
D059767 Recombinational DNA Repair Repair of DNA DAMAGE by exchange of DNA between matching sequences, usually between the allelic DNA (ALLELES) of sister chromatids. Homologous Recombination DNA Repair,Homologous Recombination Repair of DNA,Homology-Directed dsDNA Break Repair,Homologous Recombination Double-Stranded Break DNA Repair,Homologous Recombination Repair,Homologous Recombinational Repair,Recombination Repair,Recombinational Repair of DNA,DNA Recombinational Repair,DNA Repair, Recombinational,Homologous Recombination Double Stranded Break DNA Repair,Homologous Recombinational Repairs,Homology Directed dsDNA Break Repair,Recombination Repair, Homologous,Recombinational Repair, Homologous,Repair, Homologous Recombinational,Repair, Recombination,Repair, Recombinational DNA
D020285 Cryoelectron Microscopy Electron microscopy involving rapid freezing of the samples. The imaging of frozen-hydrated molecules and organelles permits the best possible resolution closest to the living state, free of chemical fixatives or stains. Electron Cryomicroscopy,Cryo-electron Microscopy,Cryo electron Microscopy,Cryo-electron Microscopies,Cryoelectron Microscopies,Cryomicroscopies, Electron,Cryomicroscopy, Electron,Electron Cryomicroscopies,Microscopies, Cryo-electron,Microscopies, Cryoelectron,Microscopy, Cryo-electron,Microscopy, Cryoelectron
D064110 Minichromosome Maintenance Proteins A family of proteins that were originally identified in SACCHAROMYCES CEREVISIAE as being essential for maintaining the structure of minichromosomes00. They form into a protein complex that has helicase activity and is involved in a variety of DNA-related functions including replication elongation, RNA transcription, chromatin remodeling, and genome stability. MCM Protein Complex,MCM2-7 Complex,MCM2-7 Helicase,Helicase, MCM2-7,MCM2 7 Complex,MCM2 7 Helicase,Maintenance Proteins, Minichromosome

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