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The C-type lectin-like domain superfamily
Alex N Zelensky1, Jill E Gready
1Computational Proteomics and Therapy Design Group, John Curtin School of Medical Research, Australian National University, Canberra, Australia.
The FEBS Journal
|December 13, 2005
Summary
The C-type lectin-like domain (CTLD) protein superfamily has diverse functions beyond carbohydrate binding. This versatile protein scaffold, found across Metazoa, exhibits significant structural flexibility and has evolved numerous specialized ligand interactions.
Area of Science:
- Biochemistry
- Structural Biology
- Evolutionary Biology
Background:
- Proteins with C-type lectin-like domains (CTLDs) form a large, extracellular Metazoan superfamily.
- CTLDs possess a conserved 'loop-in-a-loop' structure stabilized by disulfide bridges and hydrophobic/polar interactions.
- The long loop region is flexible, mediating Ca2+-dependent carbohydrate binding, but is absent in compact CTLDs.
Purpose of the Study:
- To review the structural diversity and functional evolution of the CTLD protein superfamily.
- To update the classification of CTLD-containing proteins (CTLDcps) based on genomic analyses.
- To highlight the expanding repertoire of CTLD functions beyond ancestral carbohydrate binding.
Main Methods:
- Comparative genomic analyses of CTLD superfamily representation across various species.
- Structural analysis of conserved and variable regions within CTLDs.
- Literature review of characterized CTLD functions and evolutionary trends.
Main Results:
- The CTLD superfamily classification requires updates, particularly for invertebrates, as domain architectures differ from vertebrates.
- While Ca2+-dependent carbohydrate binding is common and likely ancestral in vertebrates, many CTLDs recognize diverse non-carbohydrate ligands.
- Compact CTLDs lack the flexible long loop, indicating structural divergence within the superfamily.
Conclusions:
- The CTLD scaffold is highly versatile, supporting diverse functions through structural adaptation and evolution.
- CTLDcps exhibit significant functional and structural diversity across different taxa.
- Further research into the CTLD superfamily promises novel discoveries regarding protein interactions and biological roles.