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Structure of the Saccharolobus solfataricus GINS tetramer.
Srihari Shankar1, Eric J Enemark1
1Department of Biochemistry and Molecular Biology, University of Arkansas for Medical Sciences, 4301 West Markham Street, Slot 516, Little Rock, AR 72205, USA.
Summary
Researchers determined the crystal structure of the archaeal GINS complex, revealing its similarity to eukaryotic GINS. Molecular modeling suggests subdomain movement is necessary for forming a functional CMG helicase complex, crucial for DNA replication and genomic stability.
Area of Science:
- Molecular Biology
- Structural Biology
- Genomics
Background:
- DNA replication requires precise regulation to maintain genomic stability and prevent diseases like cancer.
- The minichromosome maintenance (MCM) helicase complex controls DNA unwinding during replication in eukaryotes and archaea.
- MCM activation involves the recruitment of Cdc45 and the GINS complex to form the active CMG complex.
Purpose of the Study:
- To determine the crystal structure of the tetrameric GINS complex from Saccharolobus solfataricus (Sso).
- To compare the SsoGINS structure with known eukaryotic and archaeal GINS structures.
- To investigate the potential structural rearrangements required for SsoGINS to form an active CMG complex.
Main Methods:
- X-ray crystallography to determine the SsoGINS complex structure.
- Comparative structural analysis with existing GINS structures.
- Molecular modeling to simulate potential complex formation and subdomain movements.
Main Results:
- The crystal structure of the SsoGINS complex was determined, showing a conserved core structure similar to other GINS complexes.
- Structural comparisons revealed high similarity to eukaryotic and other archaeal GINS complexes.
- Molecular modeling indicated that a subdomain of SsoGINS would need to reposition for functional CMG complex formation.
Conclusions:
- The SsoGINS complex shares a conserved core structure with eukaryotic and archaeal counterparts.
- Structural plasticity in SsoGINS may be essential for its integration into the CMG helicase complex.
- Understanding GINS structure and function provides insights into conserved DNA replication mechanisms across archaea and eukaryotes.
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