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iron

  • Open Access
    Critical Role for Molecular Iron in <span class="named-content genus-species" id="named-content-1">Coxiella burnetii</span> Replication and Viability
    Research Article | Molecular Biology and Physiology
    Critical Role for Molecular Iron in Coxiella burnetii Replication and Viability

    Host organisms restrict the availability of iron to invading pathogens in order to reduce pathogen replication. To counteract the host’s response to infection, bacteria can rely on redundant mechanisms to obtain biologically diverse forms of iron during infection. C. burnetii appears specifically dependent on molecular iron for replication and viability and exhibits a...

    Savannah E. Sanchez, Anders Omsland
  • Open Access
    Quantifying Oxygen Management and Temperature and Light Dependencies of Nitrogen Fixation by <span class="named-content genus-species" id="named-content-1">Crocosphaera watsonii</span>
    Research Article | Molecular Biology and Physiology
    Quantifying Oxygen Management and Temperature and Light Dependencies of Nitrogen Fixation by Crocosphaera watsonii

    Crocosphaera is one of the major N2-fixing microorganisms in the open ocean. On a global scale, the process of N2 fixation is important in balancing the N budget, but the factors governing the rate of N2 fixation remain poorly resolved. Here, we combine a mechanistic model and both previous and present laboratory studies of Crocosphaera to quantify how chemical factors such as C, N, Fe...

    Keisuke Inomura, Curtis Deutsch, Samuel T. Wilson, Takako Masuda, Evelyn Lawrenz, Lenka Bučinská, Roman Sobotka, Julia M. Gauglitz, Mak A. Saito, Ondřej Prášil, Michael J. Follows
  • Open Access
    Extracellular Electron Transfer May Be an Overlooked Contribution to Pelagic Respiration in Humic-Rich Freshwater Lakes
    Opinion/Hypothesis | Applied and Environmental Science
    Extracellular Electron Transfer May Be an Overlooked Contribution to Pelagic Respiration in Humic-Rich Freshwater Lakes

    Humic lakes and ponds receive large amounts of terrestrial carbon and are important components of the global carbon cycle, yet how their redox cycling influences the carbon budget is not fully understood. Here we compared metagenomes obtained from a humic bog and a clear-water eutrophic lake and found a much larger number of genes that might be involved in extracellular electron transfer (EET) for iron redox reactions and humic...

    Shaomei He, Maximilian P. Lau, Alexandra M. Linz, Eric E. Roden, Katherine D. McMahon
  • Open Access
    
<span class="named-content genus-species" id="named-content-1">Chlamydomonas reinhardtii</span> LFO1 Is an IsdG Family Heme Oxygenase
    Research Article | Ecological and Evolutionary Science
    Chlamydomonas reinhardtii LFO1 Is an IsdG Family Heme Oxygenase

    This work establishes a protein in the freshwater alga Chlamydomonas reinhardtii as an IsdG family heme oxygenase. This protein, LFO1, exhibits predicted secondary structure and catalytic residues conserved in IsdG family members, in addition to a chloroplast localization sequence. Additionally, the catabolite that results from the degradation of heme by LFO1 is...

    Lisa J. Lojek, Allison J. Farrand, Jennifer H. Wisecaver, Crysten E. Blaby-Haas, Brian W. Michel, Sabeeha S. Merchant, Antonis Rokas, Eric P. Skaar
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