Publication Date:
2022-05-25
Description:
Author Posting. © American Society for Microbiology, 2001. This article is posted here by permission of American Society for Microbiology for personal use, not for redistribution. The definitive version was published in Applied and Environmental Microbiology 67 (2001): 5444-5452, doi:10.1128/AEM.67.12.5444-5452.2001.
Description:
Cyanobacteria are prominent constituents of the marine biosphere that account for a significant percentage of oceanic primary productivity. In an effort to resolve how open-ocean cyanobacteria persist in regions where the Fe concentration is thought to be limiting their productivity, we performed a number of Fe stress experiments on axenic cultures of marine Synechococcus spp., Crocosphaera sp., and Trichodesmium sp. Through this work, we determined that all of these marine cyanobacteria mount adaptive responses to Fe stress, which resulted in the induction and/or repression of several proteins. We have identified one of the Fe stress-induced proteins as an IdiA homologue. Genomic observations and laboratory data presented herein from open-ocean Synechococcus spp. are consistent with IdiA having a role in cellular Fe scavenging. Our data indicate that IdiA may make an excellent marker for Fe stress in open-ocean cyanobacterial field populations. By determining how these microorganisms respond to Fe stress, we will gain insight into how and when this important trace element can limit their growth in situ. This knowledge will greatly increase our understanding of how marine Fe cycling impacts oceanic processes, such as carbon and nitrogen fixation.
Description:
This work was partially funded by the Woods Hole Oceanographic
Institution postdoctoral scholarship and a subcontract from the Center
for Bioinorganic Chemistry at Princeton University (grant no. CHE-9810248) to E.A.W. Additional funds were supplied by the Seaver
Institute to J.W.M.
Keywords:
Cyanobacteria
;
Synechococcus spp.
;
Crocosphaera sp
;
Trichodesmium sp
;
Iron stress
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
1352032 bytes
Format:
application/pdf
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