Effects of Iron Limitation on the Respiratory Chain and the Membrane Cytochrome Pattern of the Euryarchaeon Halobacterium salinarum
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D. Hubmacher
Abstract
The effects of iron limitation on the electron transport chain of the extremely halophilic Euryarchaeon Halobacterium salinarum were analyzed. When iron was growth-limiting, the respiratory rates as well as the inhibition pattern of the membranes were significantly different from membranes of iron replete cells. Changes in the availability of iron cause the formation of different respiratory pathways including different entry sites for electrons, different terminal oxidases of the respiratory chain, and drastic changes of the cytochrome composition and of the relative amounts of cytochromes. Under iron-limiting conditions, mainly low-potential cytochromes were measured. EPR spectroscopic studies revealed that the amount of proteins containing iron-sulfur clusters is reduced in membranes under iron-limiting growth conditions. Taken together, our results strongly suggest for the first time an important role of iron supply for the bioenergetics of an Archaeon.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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- Acknowledgment
- Content Index
- Author Index
- Subject Index
Artikel in diesem Heft
- Metabolic Stability, Receptor Binding, cAMP Generation, Insulin Secretion and Antihyperglycaemic Activity of Novel N-Terminal Glu9-Substituted Analogues of Glucagon-Like Peptide-1
- Characterisation of Human Dipeptidyl Peptidase IV Expressed in Pichia pastoris. A Structural and Mechanistic Comparison between the Recombinant Human and the Purified Porcine Enzyme
- Effects of Iron Limitation on the Respiratory Chain and the Membrane Cytochrome Pattern of the Euryarchaeon Halobacterium salinarum
- Anti-Mouse GPI-PLD Antisera Highlight Structural Differences between Murine and Bovine GPI-PLDs
- Substrate Specificity of Glutaminyl Cyclases from Plants and Animals
- The Binding of Haptoglobin to Apolipoprotein AI: Influence of Hemoglobin and Concanavalin A
- A Novel Water-Soluble and Cell-Permeable Calpain Inhibitor Protects Myocardial and Mitochondrial Function in Postischemic Reperfusion
- Potent Bivalent Inhibition of Human Tryptase-? by a Synthetic Inhibitor
- Aza-Peptide Epoxides: Potent and Selective Inhibitors of Schistosoma mansoni and Pig Kidney Legumains (Asparaginyl Endopeptidases)
- Semisynthesis and Application of Carboxyfluorescein-Labelled Biologically Active Human Interleukin-8
- Acknowledgment
- Content Index
- Author Index
- Subject Index
