norvegicum and S. halorespirans; and some that might remove toxic material Trametinib chemical structure from the water, such as bacteria in genera Beggiatoa, Desulfobacterium and Sulfurospirillum. In addition, a few of the genera detected might have the ability to utilize organic phosphorus, such as those in genus Enterobacter. In short, most of the endophytic bacteria in reed roots might have a strong potential to enhance phytoremediation, especially with regard to the nitrogen and sulfur cycles and removal
of some organic matter during water purification by the reed-constructed wetland. However, no ammonia-oxidizing bacteria (AOB), such as Nitrosomonas and Nitrosospira, and no anammox bacteria, such as Candidatus‘Brocadia’, ‘Kuenenia’, ‘Scalindua’, and ‘Jettenia,’ which are often detected in certain soil types and at particular depths (Humbert et al., 2010), were detected in our clone library. This suggests that the endophytic buy Avasimibe bacteria in reed roots are probably not involved in the first step of nitrification during which ammonia is converted to nitrite, and anaerobic oxidation of ammonium, but could carry out the other steps of nitrification as well as denitrification and nitrogen fixation. However, some AOB and Bacillus bacteria have been found in the rhizosphere of P. australis (Xing et al., 2008; Xie et al., 2009), indicating that bacteria in the rhizosphere and endophytic
bacteria may play different roles in nutrient metabolism in wetland ecosystems. However, because the cloning sequences cannot provide direct information on the function of the individual community members, further work is necessary to improve our understanding of the mechanisms through which endophytic bacteria of reed roots mediate water purification. We would like to thank
Daniel Keck at UC Santa Cruz for his assistance with English language and grammatical editing of the manuscript. This work was funded by the Scientific Research Program of Beijing Municipal Commission of Education. Y.H.L. and J.N.Z. contributed equally to this work. Nucleotide Dipeptidyl peptidase sequence data reported are available in the GenBank databases under the accession numbers from GU178822 to GU178836, from GU178838 to GU178862 and from GU178864 to GU178880. “
“Subtilisin-like proteases are widely distributed and reported to be required for virulence in pathogenic fungi. In chestnut blight fungus Cryphonectria parasitica, prb1, encoding a putative subtilisin-like protease, was expressed and recombinant Prb1 protein was shown to have a protease activity in vitro. prb1-deleted mutants exhibited reduced total protease activity by 60%. The Δprb1 mutants showed a phenotype of reduced aerial hyphae, lower level of sporulation, and a significant reduction in virulence. Additionally, site-directed mutagenesis of Prb1 protein revealed that D195, H227, and S393 are critical for C. parasitica Prb1 function in vivo.
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