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The ability of this strain to use reduced phosphorus substrates in its energy metabolism was the first evidence of dissimilatory anaerobic phosphite oxidation Schink, and Friedrich, ; Schink et al. Four of the genes ptxD-ptdFCG were cloned and heterologously expressed. Our further studies on Desulfotignum phosphitoxidans will contribute to reveal a new type of bacterial energy metabolism. Biodegradability is a feature of interest especially for packaging material which enters the waste treatment process after a comparably short turnaround time. The development of biodegradable plastics and other synthetic polymers has to combine the knowledge on microbial biodegradation strategies with the skills of specific polymer synthesis and the desired properties of the polymeric product rigidity, water resistance etc.
Since waste material in dump sites, compost heaps etc. Anaerobic phosphite oxidation Project leader: Dr.
Isolation and Characterization of a Novel Electrogenic Bacterium, Dietzia sp. RNV-4
Diliana D. Simeonova The main objective of this project is to analyze the biochemistry of phosphite oxidation in the energy metabolism of anaerobic bacteria. This project is carried out in cooperation with a partner in chemical industry. Menaquinone is found in the inner membrane IM of the bacterium, where it serves as a lipid-soluble electron carrier in the electron transport chain blue structure in right inset.
Mevers et al. Analysis of mutants defective in menaquinone synthesis suggested it is created from a molecule called DHNA, by a reaction that should be catalyzed via a transaminase. However, genetic analysis of S.
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And indeed, Mevers et al. These data support the hypothesis that ACNQ can work as an electron shuttle at micromolar concentrations in S. However, this activity may involve redox reactions that occur inside the cell Yamazaki et al. The biological relevance of ACNQ remains an open question.
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In certain organisms, it can act as an electron sink and accept electrons, shifting the redox balance of the cell and directing the metabolism towards fermentation end products which are more energetically favorable Freguia et al. A variety of organisms that do not transfer their electrons outside still produce low levels of ACNQ, which may suggest other roles for the compound. For instance, it may be involved in cell-to-cell communication as well as in unconventional cellular warfare where redox balance is disrupted, or act as a nutrient for surrounding organisms.
Biochemistry and Physiology of Anaerobic Bacteria / Edition 1
This article is distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use and redistribution provided that the original author and source are credited. Article citation count generated by polling the highest count across the following sources: Crossref , PubMed Central , Scopus.
Some anaerobic bacteria use insoluble minerals as terminal electron acceptors and discovering the ways in which electrons move through the membrane barrier to the exterior acceptor forms an active field of research with implications for both bacterial physiology and bioenergy. A previous study suggested that Shewanella oneidensis MR-1 utilizes a small, polar, redox active molecule that serves as an electron shuttle between the bacteria and insoluble acceptors, but the shuttle itself has never been identified.
Through isolation and synthesis, we identify it as ACNQ 2-aminocarboxy-1,4-naphthoquinone , a soluble analog of menaquinone. ACNQ is derived from DHNA 1,4-dihydroxynaphthoic acid in a non-enzymatic process that frustrated genetic approaches to identify the shuttle.
Cited 0 Views Annotations Open annotations. The current annotation count on this page is being calculated. Cite this article as: eLife ;8:e doi: Figure 1. Download asset Open asset. Lactococcus lactis catalyses electricity generation at microbial fuel cell anodes via excretion of a soluble quinone S Freguia M Masuda S Tsujimura K Kano Bioelectrochemistry 76 — Cryptic biogeochemical cycles: unravelling hidden redox reactions A Kappler C Bryce Environmental Microbiology 19 —