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The speciation of conger eel galectins by rapid adaptive evolution
Tomohisa Ogawa1, Tsuyoshi Shirai, Clara Shionyu-Mitsuyama
1Department of Biomolecular Science, Graduate School of Life Sciences, Tohoku University, Sendai 981-8555, Japan. ogawa@biochem.tohoku.ac.jp
Glycoconjugate Journal
|February 6, 2004
Summary
Conger eel galectins (congerins I and II) show rapid adaptive evolution, developing new structures and ligand-binding sites. This study explores their molecular evolution and structure-function relationships.
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Biochemistry
Background:
- Accelerated evolution via positive Darwinian selection is common in venomous and reproductive proteins.
- This rapid evolution impacts protein function, potentially driving speciation and novel gene development.
Purpose of the Study:
- To analyze the molecular evolution of two galectins, congerins I and II, from conger eel skin mucus.
- To investigate the structure-function relationships of these rapidly evolving galectins.
Main Methods:
- Complementary DNA (cDNA) cloning was used to isolate and analyze the genes.
- X-ray structural analysis determined the three-dimensional structures of the galectins.
Main Results:
- Congerins I and II have undergone rapid adaptive evolution.
- They exhibit a novel structure featuring strand-swapping.
- A unique ligand-binding site has emerged in these galectins.
Conclusions:
- Conger eel galectins exemplify rapid adaptive evolution in protein families.
- Their unique structural adaptations are linked to their functions and evolutionary trajectory.