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Conserved DNA structures in origins of replication.
1Department of Biological Sciences, Purdue University, West Lafayette, IN 47907.
Nucleic Acids Research
|March 25, 1990
Summary
DNA replication initiation involves specific DNA structures. Computer analysis reveals initiator protein binding sites in DNA bending domains and direct repeats in anti-bent domains, suggesting conserved structural roles in replication across organisms.
Area of Science:
- Molecular Biology
- Genetics
- Biophysics
Background:
- Prokaryotic DNA replication initiation requires initiator protein binding to origin DNA.
- This process involves duplex opening of adjacent direct repeat sequences.
Purpose of the Study:
- To investigate the higher-order DNA structure at replication origins.
- To determine if replication sequences are localized in altered structural domains.
Main Methods:
- Computer analysis of DNA replication origins from various sources (plasmids, phages, bacteria).
- Examination of higher-order DNA structure and sequence periodicity.
Main Results:
- Initiator protein binding sites are located in discrete DNA bending domains.
- Direct repeats are found within anti-bent domains characterized by A3/T3 tract periodicity.
- This periodicity avoids the typical DNA bending periodicity.
Conclusions:
- Conserved DNA structures, including bending and anti-bent domains, play a universal role in DNA replication initiation.
- Findings provide new insights into the structural requirements for DNA replication across different organisms.