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211.
Involvement of Calcium and Calmodulin in Protein and Amino Acid Metabolism in Rice Roots under Anoxia 总被引:6,自引:0,他引:6
The pretreatment of rice roots for 1 h in aerobic conditionswith the Ca2+-channel blockers ruthenium red (RR) and verapamiland the calmodulin (CaM) antagonists N-(6-aminohexyl)-5-chloro-1-naphtylenesulfonamide(W-7) and trifluoperazine, induced during 3 h of anoxia: (i)inhibition of amino acid and 相似文献
212.
Reggiani Remo; Mattana Monica; Aurisano Nicoletta; Bertani Alcide 《Plant & cell physiology》1993,34(2):379-383
The presence of nitrate in the seed and its utilization duringanaerobic germination of rice (Oryza sativa L.) were studied.The results indicate that nitrate was reduced and assimilatedby the coleoptile for 11 days during anaerobic growth aftergermination. The importance of the anoxic utilization of nitrateis discussed. (Received June 19, 1992; Accepted January 4, 1993) 相似文献
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A disaccharide has been isolated from the mammary gland of rats on the 18th day of lactation and identified as 6-O-β-D-galactopyranosyl myo-inositol (6-β-galactinol). The structure was established using chemical and enzymatic methods, paper and gas chromatography, and combined gas chromatography-mass spectrometry. This is the first report of a myo-inositol galactoside of animal origin. 相似文献
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216.
Sean M. West Remo Rohs Richard S. Mann Barry Honig 《Journal of biomolecular structure & dynamics》2013,31(6):861-866
Abstract Proteins rely on a variety of readout mechanisms to preferentially bind specific DNA sequences. The nucleosome offers a prominent example of a shape readout mechanism where arginines insert into narrow minor groove regions that face the histone core. Here we compare DNA shape and arginine recognition of three nucleosome core particle structures, expanding on our previous study by characterizing two additional structures, one with a different protein sequence and one with a different DNA sequence. The electrostatic potential in the minor groove is shown to be largely independent of the underlying sequence but is, however, dominated by groove geometry. Our results extend and generalize our previous observation that the interaction of arginines with narrow minor grooves plays an important role in stabilizing the deformed DNA in the nucleosome. 相似文献
217.
Olivia Appert Alejandro Ramirez Garcia Remo Frei Caroline Roduit Florentin Constancias Vera Neuzil-Bunesova Ruth Ferstl Jianbo Zhang Cezmi Akdis Roger Lauener Christophe Lacroix Clarissa Schwab 《Environmental microbiology》2020,22(9):3909-3921
The acquisition of the infant gut microbiota is key to establishing a host-microbiota symbiosis. Microbially produced metabolites tightly interact with the immune system, and the fermentation-derived short-chain fatty acid butyrate is considered an important mediator linked to chronic diseases later in life. The intestinal butyrate-forming bacterial population is taxonomically and functionally diverse and includes endospore formers with high transmission potential. Succession, and contribution of butyrate-producing taxa during infant gut microbiota development have been little investigated. We determined the abundance of major butyrate-forming groups and fermentation metabolites in faeces, isolated, cultivated and characterized the heat-resistant cell population, which included endospores, and compared butyrate formation efficiency of representative taxa in batch cultures. The endospore community contributed about 0.001% to total cells, and was mainly composed of the pioneer butyrate-producing Clostridium sensu stricto. We observed an increase in abundance of Faecalibacterium prausnitzii, butyrate-producing Lachnospiraceae and faecal butyrate levels with age that is likely explained by higher butyrate production capacity of contributing taxa compared with Clostridium sensu stricto. Our data suggest that a successional arrangement and an overall increase in abundance of butyrate forming populations occur during the first year of life, which is associated with an increase of intestinal butyrate formation capacity. 相似文献
218.
Leonardo Lauciello Gabriela Lack Leonardo Scapozza Remo Perozzo 《Biochemistry and Biophysics Reports》2016
The natural substrates of the enzymes involved in type-II fatty acid biosynthesis (FAS-II) are acylated acyl carrier proteins (acyl-ACPs). The state of the art method to produce acyl-ACPs involves the transfer of a phosphopantetheine moiety from CoA to apo-ACP by E. coli holo-ACP synthase (EcACPS), yielding holo-ACP which subsequently becomes thioesterified with free fatty acids by the E. coli acyl-ACP synthase (EcAAS). Alternatively, acyl-ACPs can be synthesized by direct transfer of acylated phosphopantetheine moieties from acyl-CoA to apo-ACP by means of EcACPS. The need for native substrates to characterize the FAS-II enzymes of P. falciparum prompted us to investigate the potential and limit of the two methods to efficiently acylate P. falciparum ACP (PfACP) with respect to chain length and β-modification and in preparative amounts. The EcAAS activity is found to be independent from the oxidation state at the β-position and accepts fatty acids as substrates with chain lengths starting from C8 to C20, whereas EcACPS accepts very efficiently acyl-CoAs with chain lengths up to C16, and with decreasing activity also longer chains (C18 to C20). Methods were developed to synthesize and purify preparative amounts of high quality natural substrates that are fully functional for the enzymes of the P. falciparum FAS-II system. 相似文献
219.
Georg Albert Benoit Gauzens Remo Ryser Elisa Thébault Shaopeng Wang Ulrich Brose 《Ecology letters》2023,26(10):1792-1802
Plant community productivity generally increases with biodiversity, but the strength of this relationship exhibits strong empirical variation. In meta-food-web simulations, we addressed if the spatial overlap in plants' resource access and animal space-use can explain such variability. We found that spatial overlap of plant resource access is a prerequisite for positive diversity–productivity relationships, but causes exploitative competition that can lead to competitive exclusion. Space-use of herbivores causes apparent competition among plants, resulting in negative relationships. However, space-use of larger top predators integrates sub-food webs composed of smaller species, offsetting the negative effects of exploitative and apparent competition and leading to strongly positive diversity–productivity relationships. Overall, our results show that spatial overlap of plants' resource access and animal space-use can greatly alter the strength and sign of such relationships. In particular, the scaling of animal space-use effects opens new perspectives for linking landscape processes without effects on biodiversity to productivity patterns. 相似文献
220.