Eukaryotic and Prokaryotic Phytochelatin Synthases Differ Less in Functional Terms Than Previously Thought: A Comparative Analysis of <i>Marchantia polymorpha</i> and <i>Geitlerinema</i> sp. PCC 7407
This paper reports functional studies on the enzyme phytochelatin synthase in the liverwort <i>Marchantia polymorpha</i> and the cyanobacterium <i>Geitlerinema</i> sp. strain PCC 7407. In vitro activity assays in control samples (cadmium-untreated) showed that phytochelatin s...
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doaj-d84724c6435f4b2cb814dfdf1510a1c82020-11-25T03:37:49ZengMDPI AGPlants2223-77472020-07-01991491410.3390/plants9070914Eukaryotic and Prokaryotic Phytochelatin Synthases Differ Less in Functional Terms Than Previously Thought: A Comparative Analysis of <i>Marchantia polymorpha</i> and <i>Geitlerinema</i> sp. PCC 7407Erika Bellini0Claudio Varotto1Marco Borsò2Lorenza Rugnini3Laura Bruno4Luigi Sanità di Toppi5Department of Biology, University of Pisa, 56126 Pisa, ItalyDepartment of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, 38100 San Michele all’Adige (TN), ItalyDepartment of Surgery, Medical, Molecular, and Critical Area Pathology, University of Pisa, 56124 Pisa, ItalyDepartment of Biology, University of Rome “Tor Vergata”, 00133 Roma, ItalyDepartment of Biology, University of Rome “Tor Vergata”, 00133 Roma, ItalyDepartment of Biology, University of Pisa, 56126 Pisa, ItalyThis paper reports functional studies on the enzyme phytochelatin synthase in the liverwort <i>Marchantia polymorpha</i> and the cyanobacterium <i>Geitlerinema</i> sp. strain PCC 7407. In vitro activity assays in control samples (cadmium-untreated) showed that phytochelatin synthase was constitutively expressed in both organisms. In the presence of 100 µM cadmium, in both the liverwort and the cyanobacterium, the enzyme was promptly activated in vitro, and produced phytochelatins up to the oligomer PC<sub>4</sub>. Likewise, <i>in vivo</i> exposure to 10–36 µM cadmium for 6-120 h induced in both organisms phytochelatin synthesis up to PC<sub>4</sub>. Furthermore, the glutathione (GSH) levels in <i>M. polymorpha</i> were constitutively low (compared with the average content in higher plants), but increased considerably under cadmium stress. Conversely, the GSH levels in <i>Geitlerinema</i> sp. PCC 7407 were constitutively high, but were halved under metal treatments. At odds with former papers, our results demonstrate that, as in <i>M. polymorpha</i> and other plants, the cyanobacterial phytochelatin synthase exposed to cadmium possesses manifest transpeptidasic activity, being able to synthesize phytochelatins with a degree of oligomerization higher than PC<sub>2</sub>. Therefore, prokaryotic and eukaryotic phytochelatin synthases differ less in functional terms than previously thought.https://www.mdpi.com/2223-7747/9/7/914bryophytescadmiumcyanobacteriaglutathioneheavy metalsliverworts |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Erika Bellini Claudio Varotto Marco Borsò Lorenza Rugnini Laura Bruno Luigi Sanità di Toppi |
spellingShingle |
Erika Bellini Claudio Varotto Marco Borsò Lorenza Rugnini Laura Bruno Luigi Sanità di Toppi Eukaryotic and Prokaryotic Phytochelatin Synthases Differ Less in Functional Terms Than Previously Thought: A Comparative Analysis of <i>Marchantia polymorpha</i> and <i>Geitlerinema</i> sp. PCC 7407 Plants bryophytes cadmium cyanobacteria glutathione heavy metals liverworts |
author_facet |
Erika Bellini Claudio Varotto Marco Borsò Lorenza Rugnini Laura Bruno Luigi Sanità di Toppi |
author_sort |
Erika Bellini |
title |
Eukaryotic and Prokaryotic Phytochelatin Synthases Differ Less in Functional Terms Than Previously Thought: A Comparative Analysis of <i>Marchantia polymorpha</i> and <i>Geitlerinema</i> sp. PCC 7407 |
title_short |
Eukaryotic and Prokaryotic Phytochelatin Synthases Differ Less in Functional Terms Than Previously Thought: A Comparative Analysis of <i>Marchantia polymorpha</i> and <i>Geitlerinema</i> sp. PCC 7407 |
title_full |
Eukaryotic and Prokaryotic Phytochelatin Synthases Differ Less in Functional Terms Than Previously Thought: A Comparative Analysis of <i>Marchantia polymorpha</i> and <i>Geitlerinema</i> sp. PCC 7407 |
title_fullStr |
Eukaryotic and Prokaryotic Phytochelatin Synthases Differ Less in Functional Terms Than Previously Thought: A Comparative Analysis of <i>Marchantia polymorpha</i> and <i>Geitlerinema</i> sp. PCC 7407 |
title_full_unstemmed |
Eukaryotic and Prokaryotic Phytochelatin Synthases Differ Less in Functional Terms Than Previously Thought: A Comparative Analysis of <i>Marchantia polymorpha</i> and <i>Geitlerinema</i> sp. PCC 7407 |
title_sort |
eukaryotic and prokaryotic phytochelatin synthases differ less in functional terms than previously thought: a comparative analysis of <i>marchantia polymorpha</i> and <i>geitlerinema</i> sp. pcc 7407 |
publisher |
MDPI AG |
series |
Plants |
issn |
2223-7747 |
publishDate |
2020-07-01 |
description |
This paper reports functional studies on the enzyme phytochelatin synthase in the liverwort <i>Marchantia polymorpha</i> and the cyanobacterium <i>Geitlerinema</i> sp. strain PCC 7407. In vitro activity assays in control samples (cadmium-untreated) showed that phytochelatin synthase was constitutively expressed in both organisms. In the presence of 100 µM cadmium, in both the liverwort and the cyanobacterium, the enzyme was promptly activated in vitro, and produced phytochelatins up to the oligomer PC<sub>4</sub>. Likewise, <i>in vivo</i> exposure to 10–36 µM cadmium for 6-120 h induced in both organisms phytochelatin synthesis up to PC<sub>4</sub>. Furthermore, the glutathione (GSH) levels in <i>M. polymorpha</i> were constitutively low (compared with the average content in higher plants), but increased considerably under cadmium stress. Conversely, the GSH levels in <i>Geitlerinema</i> sp. PCC 7407 were constitutively high, but were halved under metal treatments. At odds with former papers, our results demonstrate that, as in <i>M. polymorpha</i> and other plants, the cyanobacterial phytochelatin synthase exposed to cadmium possesses manifest transpeptidasic activity, being able to synthesize phytochelatins with a degree of oligomerization higher than PC<sub>2</sub>. Therefore, prokaryotic and eukaryotic phytochelatin synthases differ less in functional terms than previously thought. |
topic |
bryophytes cadmium cyanobacteria glutathione heavy metals liverworts |
url |
https://www.mdpi.com/2223-7747/9/7/914 |
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