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Annual Review of Microbiology

Volume 78, 2024

Molecular Mechanisms for Iron Uptake and Homeostasis in Marine Eukaryotic Phytoplankton

Abstract

The micronutrient iron is essential for phytoplankton growth due to its central role in a wide variety of key metabolic processes including photosynthesis and nitrate assimilation. As a result of scarce bioavailable iron in seawater, marine primary productivity is often iron-limited with future iron supplies remaining uncertain. Although evolutionary constraints resulted in high cellular iron requirements, phytoplankton evolved diverse mechanisms that enable uptake of multiple forms of iron, storage of iron over short and long timescales, and modulation of their iron requirement under stress. Genomics continues to increase our understanding of iron-related proteins that are homologous to those characterized in other model organisms, while recently, molecular and cell biology have been revealing unique genes and processes with connections to iron acquisition or use. Moreover, there are an increasing number of examples showing the interplay between iron uptake and extracellular processes such as boundary layer chemistry and microbial interactions.

Keyword(s): algae, endocytosis, iron limitation, metalloenzymes, phototrophy, siderophores
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2024-11-20
2025-04-24
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Molecular Mechanisms for Iron Uptake and Homeostasis in Marine Eukaryotic Phytoplankton
Annual Review of Microbiology 78, 213 (2024); https://doi.org/10.1146/annurev-micro-041222-023252
/content/journals/10.1146/annurev-micro-041222-023252
/content/journals/10.1146/annurev-micro-041222-023252
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