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DNA and RNA ligases: structural variations and shared mechanisms.
1Department of Biochemistry & Molecular Biology, Kimmel Cancer Center, Thomas Jefferson University, 233 South 10th Street, Philadelphia, PA 19107, USA. John.Pascal@mail.jci.tju.edu
Current Opinion in Structural Biology
|February 12, 2008
Summary
DNA and RNA ligases facilitate polynucleotide joining through a three-step mechanism involving AMP modification. Recent crystal structures reveal how these enzymes use AMP and multi-domain architecture to catalyze the crucial end-joining reaction.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- DNA and RNA ligases are essential enzymes that catalyze the formation of phosphodiester bonds between nucleic acid fragments.
- These enzymes employ a conserved three-step reaction mechanism involving adenylation (covalent modification with AMP) of both the enzyme and the substrate.
- Understanding the structural basis of ligase function is critical for various applications, including molecular biology research and biotechnology.
Purpose of the Study:
- To elucidate the structural mechanisms by which DNA and RNA ligases catalyze polynucleotide end-joining.
- To provide insights into the role of the AMP cofactor and enzyme architecture in substrate manipulation and catalysis.
- To integrate structural data with mechanistic understanding for a dynamic view of the ligation process.
Main Methods:
- X-ray crystallography was used to determine the structures of several polynucleotide ligases.
- Structures were obtained for ligases in complex with nucleic acid substrates and in unliganded states.
- Analysis of crystal structures focused on enzyme-nucleic acid interactions, AMP binding, and domain organization.
Main Results:
- Crystal structures of ATP-dependent DNA ligases, an NAD+-dependent DNA ligase, and an ATP-dependent RNA ligase in complex with nucleic acid were determined.
- These structures reveal how the AMP group and multi-domain architecture are utilized to manipulate nucleic acid structure.
- Unliganded structures provided complementary information, contributing to a dynamic understanding of the ligation mechanism.
Conclusions:
- Recent crystallographic studies have provided unprecedented structural insights into the function of DNA and RNA ligases.
- The AMP group and the multi-domain architecture of ligases are key elements in orchestrating the end-joining reaction.
- A comprehensive and dynamic model of the multi-step ligation mechanism has emerged from integrating structural and biochemical data.
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