Cited by 105Marine and coastal ecosystemsPlant Micronutrient Interactions and EffectsEnvironmental Toxicology and Ecotoxicology

Weak organic ligands enhance zinc uptake in marine phytoplankton

Aristilde, Ludmilla, Xu, Yan, Morel, François M. M.·2012·Environmental Science & Technology

Abstract

A recent study of the effect of pH on Zn and Cd bioavailability shows that binding to weak organic ligands can increase the pool of metals available to phytoplankton in the presence of strong chelating agents. We explore the underlying mechanism in laboratory experiments with the model species Emiliania huxleyi and Thalassiosira weissflogii. Additions of L- and D- isomers of cysteine (Cys) result in similar increases in Zn uptake rates in the presence of the strong chelator ethylenediaminetetraacetic acid (EDTA) but decrease it in the absence of EDTA, ruling out uptake by a specific Zn-Cys transporter. The effect of Cys does not result from alleviating diffusion limitation of inorganic Zn. The enhancement of Zn uptake kinetics by weak ligands is consistent with a mechanism involving formation of a transient ternary complex with uptake molecules: (1) the enhancement is most dramatic in Zn limited cells whose high affinity transporters should be most effective at extracting Zn from weak ligands; (2) the enhancement occurs with a variety of weak ligands, demonstrating that the underlying mechanism has little chemical specificity; and (3) no enhancement of uptake is seen when Zn is bound in complexes that would make formation of multiligand complexes with uptake molecules difficult. Weak complexing agents which have received heretofore little attention may play a key role in the bioavailability of metals in natural waters.

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Crossref · 10.1021/es300335u

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  • Recent culture work demonstrated that weakly binding organic ligands can increase Zn uptake rates in phytoplankton.

    “Consistent with this idea is recent culture work after Xu et al. (2012) and Aristilde et al. (2012), where it was demonstrated that weakly binding organic ligands can in fact increase Zn uptake rates in phytoplankton.”

    From Trace elements at the intersection of marine biological and geochemical evolution (2016) · cites this paper as Aristilde et al., 2012

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Authors
Aristilde, L., Xu, Y., & Morel, F. M. M.
Affiliations
Princeton University (US)
Corresponding author
Xu, Yan
Venue
Environmental Science & Technology
Published
2012-04-26
Volume
46
Issue
10
Pages
5438-5445
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2328200982
Cited by
105
References
43
Citations by year
2026: 1 · 2025: 7 · 2024: 10 · 2023: 5 · 2022: 8 · 2021: 7 · 2020: 8 · 2019: 10 · 2018: 8 · 2017: 5 · 2016: 11 · 2015: 8 · 2014: 10 · 2013: 7
FWCI
5.92
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Science & Technology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Micronutrient Interactions and Effects
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Environmental Toxicology and Ecotoxicology
Keywords
zinc uptake, metal bioavailability, marine phytoplankton, Emiliania huxleyi, Thalassiosira weissflogii, cysteine, EDTA chelation, metal transporters, zinc limitation, diffusion limitation, metal speciation
MeSH terms
Biodegradation, Environmental, Cell Membrane, Cysteine, Diffusion, Edetic Acid, Ligands, Organic Chemicals, Phytoplankton, Time Factors, Zinc, Haptophyta, Aquatic Organisms

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