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The origin recognition complex: a biochemical and structural view.
1Department of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY, 11794, USA, hli@bnl.gov.
Sub-Cellular Biochemistry
|August 25, 2012
Summary
The origin recognition complex (ORC) is an ATP-dependent machine crucial for eukaryotic DNA replication. Recent structural studies reveal its role in forming pre-replicative complexes at DNA origins to initiate DNA duplication.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- The origin recognition complex (ORC) was discovered in yeast in 1992.
- ORC's identification enabled investigations into eukaryotic genome duplication control.
- Recent advances in electron microscopy are providing structural insights into ORC.
Purpose of the Study:
- To outline current biochemical knowledge of ORC across eukaryotic systems.
- To emphasize recent structural and biochemical studies on ORC.
- To highlight ORC's conserved function in initiating DNA replication.
Main Methods:
- Review of existing biochemical data on ORC.
- Analysis of recent electron microscopy and image reconstruction studies.
- Comparative analysis across different eukaryotic systems.
Main Results:
- ORC is an ATP-dependent machine.
- ORC recruits proteins to form pre-replicative complexes (pre-RCs).
- Pre-RC formation occurs at origins of DNA replication.
Conclusions:
- ORC plays a conserved role in initiating DNA replication in eukaryotic cells.
- Despite species-specific variations, ORC functions as a core component of the DNA replication machinery.
- Structural and biochemical data are converging to define ORC's mechanism of action.
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