Physiological characteristics of Magnetospirillum gryphiswaldense MSR-1 that control cell growth under high-iron and low-oxygen conditions
Autor: | You-Liang Peng, Yinjia Wang, Yuan Zhou, Xianyu Li, Wei Jiang, Jiesheng Tian, Lei Wang, Ziding Zhang, Dan Li, Wei-Jia Zhang, Jilun Li, Xu Wang, Ying Li, Qing Wang |
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Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
0301 basic medicine
genetic structures Iron Science 030106 microbiology Magnetosome Sulfur metabolism Biology Article Transcriptome 03 medical and health sciences Ion binding Magnetospirillum Transcription factor Multidisciplinary Gene Expression Profiling Metabolism Gene Expression Regulation Bacterial biology.organism_classification Oxygen Magnetic Fields Biochemistry Multigene Family Medicine Magnetosomes Biological regulation |
Zdroj: | Scientific Reports, Vol 7, Iss 1, Pp 1-11 (2017) Scientific Reports |
ISSN: | 2045-2322 |
Popis: | Magnetosome formation by Magnetospirillum gryphiswaldense MSR-1 is dependent on iron and oxygen levels. We used transcriptome to evaluate transcriptional profiles of magnetic and non-magnetic MSR-1 cells cultured under high-iron and low-iron conditions. A total of 80 differentially expressed genes (DEGs) were identified, including 53 upregulated and 27 downregulated under high-iron condition. These DEGs belonged to the functional categories of biological regulation, oxidation-reduction process, and ion binding and transport, and were involved in sulfur metabolism and cysteine/methionine metabolism. Comparison with our previous results from transcriptome data under oxygen-controlled conditions indicated that transcription of mam or mms was not regulated by oxygen or iron signals. 17 common DEGs in iron- and oxygen-transcriptomes were involved in energy production, iron transport, and iron metabolism. Some unknown-function DEGs participate in iron transport and metabolism, and some are potential biomarkers for identification of Magnetospirillum strains. IrrA and IrrB regulate iron transport in response to low-oxygen and high-iron signals, respectively. Six transcription factors were predicted to regulate DEGs. Fur and Crp particularly co-regulate DEGs in response to changes in iron or oxygen levels, in a proposed joint regulatory network of DEGs. Our findings provide new insights into biomineralization processes under high- vs. low-iron conditions in magnetotactic bacteria. |
Databáze: | OpenAIRE |
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