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171.
Kesava R. Nagar-Anthal Veronica E. Worrell Ross Teal D. P. Nagle 《Archives of microbiology》1996,166(2):136-140
The pterin compound lumazine [2, 4-(1H, 3H)-pteridinedione] inhibited the growth of several methanogenic archaea completely
at a concentration of ≤ 0.6 mM and was bacteriocidal for Methanobacterium thermoautotrophicum strain Marburg. In contrast, growth of two non-methanogenic archaea, several eubacteria, and one eukaryote was not strongly
affected at much higher concentrations. In washed-cell suspensions, methanogenesis from H2 and CO2 by Mb. thermoautotrophicum or from H2 and methanol by Methanosarcina barkeri was inhibited by addition of lumazine. In cell-free extracts of Mb. thermoautotrophicum, H2-driven methane production from CO2 or CH3-S-CoM was completely inhibited by 0.6 mM lumazine. The results suggest that the compound may be useful in probing the methanogenesis
pathway or in selecting against methanogens.
Received: 30 January 1996 / Accepted 15 May 1996 相似文献
172.
A proteome-wide protein-protein interaction (PPI) network of Methanobrevibacter ruminantium M1 (MRU), a predominant rumen methanogen, was constructed from its metabolic genes using a gene neighborhood algorithm and then compared with closely related rumen methanogens Using proteome-wide PPI approach, we constructed network encompassed 2194 edges and 637 nodes interacting with 634 genes. Network quality and robustness of functional modules were assessed with gene ontology terms. A structure-function-metabolism mapping for each protein has been carried out with efforts to extract experimental PPI concomitant information from the literature. The results of our study revealed that some topological properties of its network were robust for sharing homologous protein interactions across heterotrophic and hydrogenotrophic methanogens. MRU proteome has shown to establish many PPI sub-networks for associated metabolic subsystems required to survive in the rumen environment. MRU genome found to share interacting proteins from its PPI network involved in specific metabolic subsystems distinct to heterotrophic and hydrogenotrophic methanogens. Across these proteomes, the interacting proteins from differential PPI networks were shared in common for the biosynthesis of amino acids, nucleosides, and nucleotides and energy metabolism in which more fractions of protein pairs shared with Methanosarcina acetivorans. Our comparative study expedites our knowledge to understand a complex proteome network associated with typical metabolic subsystems of MRU and to improve its genome-scale reconstruction in the future. 相似文献
173.
Rainer U Meckenstocka 《FEMS microbiology letters》1999,177(1):67-73
A syntrophic coculture of a new sulfate-reducing isolate, strain TRM1, with Wolinella succinogenes degraded toluene with either fumarate or NO3- as the terminal electron acceptor. Neither strain TRM1 nor W. succinogenes could metabolise toluene under these conditions in pure culture. Syntrophic degradation was 2-3 times slower than toluene utilisation by strain TRM1 in pure culture with sulfate as electron acceptor. The culture did not produce benzoate or fatty acids like acetate or propionate in detectable amounts. An increase in biomass of the syntrophic toluene-degrading culture was shown in a growth curve with nitrate as the terminal electron acceptor. Both partner organisms were detected microscopically at the end of the growth experiment. Syntrophic degradation of toluene with W. succinogenes and fumarate as the terminal electron acceptor was also demonstrated with the iron reducer Geobacter metallireducens. The results provide the first example of a fermentative oxidation of an aromatic hydrocarbon in a defined coculture. 相似文献
174.