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The origin and early evolution of membrane channels
Andrew Pohorille1, Karl Schweighofer, Michael A Wilson
1NASA Ames Research Center, Moffett Field, California 94035, USA. pohorill@raphael.arc.nasa.gov
Astrobiology
|February 16, 2005
Summary
The study suggests simple, early ion channels were protobiologically plausible. Their complex functions evolved through subtle sequence modifications, not major architectural changes, facilitating adaptation across life.
Area of Science:
- Biochemistry
- Molecular Biology
- Evolutionary Biology
Background:
- Membrane proteins, including ion channels, possess structurally simple transmembrane segments.
- Efficient solute transport, particularly for ions, was crucial for early life.
- The emergence of basic ion channel structures is considered protobiologically feasible.
Purpose of the Study:
- To explore the origin and early evolution of ion channels.
- To identify conserved protein domains associated with ion channels across all domains of life.
- To understand how simple channel structures achieve complex functionalities.
Main Methods:
- Analysis of conserved protein domains in ion channel families.
- Comparative genomics across Eukarya, Bacteria, and Archaea.
- Examination of structural simplicity and functional complexity in ion transport.
Main Results:
- Simple transmembrane segments can fold without specific sequences.
- Early ion channels likely possessed complex properties achievable through minor sequence modifications.
- Conserved domains suggest universal architectures adaptable to diverse functions.
Conclusions:
- The evolution of ion channels is rooted in protobiological plausibility and structural simplicity.
- Subtle sequence alterations, rather than global architectural changes, drive functional complexity.
- Universal channel architectures facilitate adaptation and diversification throughout evolutionary history.