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Computational Prediction of Amino Acid Preferences of Potentially Multispecific Peptide-Binding Domains Involved in Protein-Protein Interactions
Published on: January 26, 2024
Amino acid sequence coevolution in the insect bursicon ligand-receptor system
1Department of Biological Sciences, University of South Carolina, Columbia, SC 29205, USA. austin@biol.sc.edu
Molecular Phylogenetics and Evolution
|March 1, 2012
Summary
Functional constraints drive coordinated amino acid changes in insect bursicon signaling components. This study reveals how specific sites (SPC sites) exhibit parallel replacements, suggesting limited amino acid options due to functional requirements.
Area of Science:
- Evolutionary Biology
- Molecular Evolution
- Insect Physiology
Background:
- The bursicon signaling system, crucial for insect cuticle hardening and wing expansion, comprises the BURSα/BURSβ heterodimer and its receptor BURSrec.
- Understanding the evolutionary dynamics of protein components is key to deciphering functional constraints and adaptation.
Purpose of the Study:
- To investigate patterns of amino acid residue replacement within the bursicon signaling system across insect phylogeny.
- To identify and characterize sites with co-occurring, concordant amino acid changes (SPC sites) and their evolutionary implications.
Main Methods:
- Reconstruction of amino acid residue replacement patterns across a phylogeny of 17 insect species.
- Statistical analysis to detect sets of branches with perfectly concordant changes (SPC sites).
- Comparative analysis of SPC sites versus other multi-change sites regarding the number, type (parallel vs. convergent), and chemical nature of amino acid substitutions.
Main Results:
- Identified a greater-than-expected occurrence of SPC sites within the bursicon signaling system.
- SPC sites exhibited significantly fewer total changes and a higher tendency for parallel amino acid replacements compared to other sites.
- Parallel changes at SPC sites involved amino acids with lower mean chemical distances, indicating selection for similar physicochemical properties.
Conclusions:
- Functional constraints significantly influence amino acid substitutions in the bursicon signaling system.
- These constraints favor parallel, coordinated amino acid changes at specific sites, impacting both individual proteins and interacting components.
- The findings highlight the role of limited amino acid repertoires at constrained sites in driving molecular evolution within signaling pathways.
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