Related Experiment Video
Updated: May 4, 2026
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Isolation and Characterization of Intact Phycobilisome in Cyanobacteria
Published on: November 10, 2021
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Experimental Evidence for a Metal-Related Function of a Cyanobactin
Philipp Baur1,2,3,4, Timothy A Hill3,4, Kai-Chen Wu3,4
1Universität Heidelberg, Anorganisch-Chemisches Institut, and Interdisciplinary Center for Scientific Computing (IWR), Heidelberg, Germany.
Angewandte Chemie (International Ed. in English)
|May 3, 2026
Summary
Copper binding to patellamides, marine peptides from cyanobacteria, enhances their production and suggests a role in facilitating carbonate transport. This reveals novel metal-related functions for cyclic peptides.
Area of Science:
- Marine Biology
- Biochemistry
- Chemical Biology
Background:
- Prochloron didemni, a cyanobacterium, produces patellamides, which are macrocyclic octapeptides.
- Copper (Cu2+) binding to patellamides is hypothesized to be linked to their biological function.
- Patellamides contain thiazole and oxazoline heterocycles.
Purpose of the Study:
- To investigate the relationship between Cu2+ binding and patellamide production and function.
- To explore the potential role of patellamides in carbonate transport.
- To provide evidence for novel metal-related roles of marine cyclic peptides.
Main Methods:
- Cu2+ injection into Lissoclinum patella to measure patG gene expression and patellamide levels.
- X-ray absorption spectroscopy to determine the structure of Cu2+-patellamide complexes in biological extracts.
- Membrane permeability assay (PAMPA, Caco-2) and intracellular pH measurements.
Main Results:
- Cu2+ injection significantly increased patG gene expression and patellamide levels in ascidians.
- X-ray absorption spectroscopy confirmed the presence of carbonato-bridged dicopper(II)-patellamide complexes in Great Barrier Reef specimens.
- Patellamides demonstrated high membrane permeability, and combined with other data, suggest a role in carbonate transport.
Conclusions:
- Cu2+ binding is linked to patellamide production and function in cyanobacteria.
- Patellamides likely facilitate carbonate transport from ascidians to Prochloron.
- This study suggests novel metal-related functions for marine cyclic peptides, specifically in cyanobactin-metal interactions.
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