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Retinal-binding proteins mirror prokaryotic dynamics in multipond solar salterns
María Gomariz1, Manuel Martínez-García, Fernando Santos
1Department of Materials, Optics and Electronics, University Miguel Hernández of Elche, Alicante, 03202, Spain; Department of Physiology, Genetics, and Microbiology, University of Alicante, Alicante, 03080, Spain.
Environmental Microbiology
|November 13, 2014
Summary
Microbial opsin diversity in solar salterns was higher than expected. Environmental factors correlate with opsin dynamics, suggesting a
Area of Science:
- Microbiology
- Environmental Science
- Molecular Biology
Background:
- Microbial opsins, such as bacteriorhodopsins, are vital light-driven proton pumps found in various environments.
- Solar salterns present unique hypersaline conditions that drive microbial adaptation and evolution.
- Understanding microbial opsin dynamics is crucial for comprehending microbial community structure and function in extreme environments.
Purpose of the Study:
- To investigate the diversity and dynamics of microbial opsins along a salinity gradient.
- To correlate opsin fluctuations with environmental factors and microbial community structure.
- To explore potential molecular mechanisms for opsin adaptation in hypersaline ecosystems.
Main Methods:
- Culture-independent approaches were employed to analyze microbial opsins.
- Denaturing gradient gel electrophoresis (DGGE) was used to retrieve opsin-like sequences.
- Statistical analyses were performed to correlate opsin dynamics with environmental parameters.
Main Results:
- Forty-three opsin-like sequences were identified, clustering into 18 phylogroups, revealing higher diversity than previously reported.
- Temporal fluctuations of opsin-related sequences closely mirrored those of their putative microbial producers.
- Some pond-specific opsins suggested the presence of previously uncharacterized microbial hosts.
Conclusions:
- Microbial opsin diversity in solar salterns is substantial and influenced by environmental factors.
- Opsin dynamics are tightly linked to the temporal fluctuations of their host microbial communities.
- Subtle modifications in the bacteriorhodopsin proton binding pocket may facilitate photocycle tuning for adaptation to hypersaline conditions and light competition.
