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Structure of the human GINS complex and its assembly and functional interface in replication initiation
Katsuhiko Kamada1, Yumiko Kubota, Toshiaki Arata
1Cellular Physiology Laboratory, RIKEN Discovery Research Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. kamadak@riken.jp
Nature Structural & Molecular Biology
|April 10, 2007
Summary
The human GINS complex
Area of Science:
- Molecular Biology
- Structural Biology
- Biochemistry
Background:
- The eukaryotic GINS complex is vital for DNA replication fork establishment and replisome progression.
- Understanding the GINS complex structure is key to elucidating DNA replication mechanisms.
Purpose of the Study:
- To determine the crystal structure of the human GINS complex.
- To investigate the roles of specific subunit domains in complex assembly and function.
Main Methods:
- X-ray crystallography was used to determine the high-resolution structure of the human GINS complex.
- Biochemical assays were employed to assess the function of different subunit domains.
Main Results:
- The human GINS complex forms a heterotetrameric, pseudo-symmetrical layered structure.
- The C-terminal domain of Sld5 is crucial for core complex assembly.
- The C-terminal domain of Psf1 is essential for chromatin binding and replication activity, despite not stabilizing the complex.
Conclusions:
- The GINS core complex provides a stable scaffold.
- The Psf1 C-terminal domain acts as a critical interface for protein interactions during replication initiation.
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