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Microbiology - Screening of gut flora of the estuarine water fish ‘Chelon parsia’ for the presence of potential antibiotic producers resulted in finding a new strain Bacillus subtilis... 相似文献
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1,2-Diaryl-1-ethanone and pyrazolo [4,3-c] quinoline-4-one as novel selective cyclooxygenase-2 inhibitors 总被引:1,自引:0,他引:1
Baruah B Dasu K Vaitilingam B Vanguri A Rao Casturi S Rao Yeleswarapu K 《Bioorganic & medicinal chemistry letters》2004,14(2):445-448
Novel 1,2-diaryl-1-ethanone 1 and pyrazolo [4,3-c] quinoline-4-one 2, with pharmacophores different from the known COX inhibitors were identified as selective COX-2 inhibitors. The communication briefly describes SAR of both the series. 相似文献
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Singh SK Saibaba V Ravikumar V Rudrawar SV Daga P Rao CS Akhila V Hegde P Rao YK 《Bioorganic & medicinal chemistry》2004,12(8):1881-1893
Several 2,3-diaryl pyrazines and quinoxalines with 4-sulfamoyl (SO(2)NH(2))/methylsulfonyl (SO(2)Me)-phenyl pharmacophores have been synthesized and evaluated for the cyclooxygenase (COX-1/COX-2) inhibitory activity. Smaller groups such as methoxy, methyl and fluoro when substituted at/around position-4 of the adjacent phenyl ring, have great impact on the selective COX-2 inhibitory activity of the series. Many potential compounds were obtained from a brief structure-activity relationship (SAR) study. Two of these, compounds 11 and 25 exhibited excellent in vivo activity in the established animal model of inflammation. Since compound 25 possessed an amenable sulfonamide group, two of its prodrugs 48 and 49 were also synthesized. Both of them have excellent in vivo potential, and represent a new class of COX-2 inhibitor. 相似文献
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Enzymatic esterification of starch using recovered coconut oil 总被引:3,自引:0,他引:3
Rajan A Prasad VS Abraham TE 《International journal of biological macromolecules》2006,39(4-5):265-272
Modification of maize and cassava starches was done using recovered coconut oil and microbial lipase. Microwave esterification was advantageous as it gave a DS 1.55 and 1.1 for maize starch and cassava starch, respectively. Solution state esterification of cassava starch for 36 h at 60 °C gave a DS of 0.08 and semi-solid state esterification gave a DS of 0.43. TGA and DSC studies showed that the higher DS attributed to the thermostability, since onset of decomposition is at a higher temperature (492 °C) than the unmodified (330 °C) and was stable above 600 °C. -Amylase digestibility and viscosity reduced for modified starch. 相似文献
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Eva Sapi Scott L. Bastian Cedric M. Mpoy Shernea Scott Amy Rattelle Namrata Pabbati Akhila Poruri Divya Burugu Priyanka A. S. Theophilus Truc V. Pham Akshita Datar Navroop K. Dhaliwal Alan MacDonald Michael J. Rossi Saion K. Sinha David F. Luecke 《PloS one》2012,7(10)
Borrelia burgdorferi, the causative agent of Lyme disease, has long been known to be capable of forming aggregates and colonies. It was recently demonstrated that Borrelia burgdorferi aggregate formation dramatically changes the in vitro response to hostile environments by this pathogen. In this study, we investigated the hypothesis that these aggregates are indeed biofilms, structures whose resistance to unfavorable conditions are well documented. We studied Borrelia burgdorferi for several known hallmark features of biofilm, including structural rearrangements in the aggregates, variations in development on various substrate matrices and secretion of a protective extracellular polymeric substance (EPS) matrix using several modes of microscopic, cell and molecular biology techniques. The atomic force microscopic results provided evidence that multilevel rearrangements take place at different stages of aggregate development, producing a complex, continuously rearranging structure. Our results also demonstrated that Borrelia burgdorferi is capable of developing aggregates on different abiotic and biotic substrates, and is also capable of forming floating aggregates. Analyzing the extracellular substance of the aggregates for potential exopolysaccharides revealed the existence of both sulfated and non-sulfated/carboxylated substrates, predominately composed of an alginate with calcium and extracellular DNA present. In summary, we have found substantial evidence that Borrelia burgdorferi is capable of forming biofilm in vitro. Biofilm formation by Borrelia species might play an important role in their survival in diverse environmental conditions by providing refuge to individual cells. 相似文献
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Akhila Bettadapur Samuel S. Hunter Rene L. Suleiman Maura C. Ruyechan Wesley Huang Charles G. Barbieri Hannah W. Miller Tammie S. Y. Tam Matthew L. Settles Katherine S. Ralston 《PLoS pathogens》2021,17(11)
While Entamoeba histolytica remains a globally important pathogen, it is dramatically understudied. The tractability of E. histolytica has historically been limited, which is largely due to challenging features of its genome. To enable forward genetics, we constructed and validated the first genome-wide E. histolytica RNAi knockdown mutant library. This library allows for Illumina deep sequencing analysis for quantitative identification of mutants that are enriched or depleted after selection. We developed a novel analysis pipeline to precisely define and quantify gene fragments. We used the library to perform the first RNAi screen in E. histolytica and identified slow growth (SG) mutants. Among genes targeted in SG mutants, many had annotated functions consistent with roles in cellular growth or metabolic pathways. Some targeted genes were annotated as hypothetical or lacked annotated domains, supporting the power of forward genetics in uncovering functional information that cannot be gleaned from databases. While the localization of neither of the proteins targeted in SG1 nor SG2 mutants could be predicted by sequence analysis, we showed experimentally that SG1 localized to the cytoplasm and cell surface, while SG2 localized to the cytoplasm. Overexpression of SG1 led to increased growth, while expression of a truncation mutant did not lead to increased growth, and thus aided in defining functional domains in this protein. Finally, in addition to establishing forward genetics, we uncovered new details of the unusual E. histolytica RNAi pathway. These studies dramatically improve the tractability of E. histolytica and open up the possibility of applying genetics to improve understanding of this important pathogen. 相似文献
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Arthur F. Kluge Bharat R. Lagu Pranab Maiti Mahaboobi Jaleel Michael Webb Jyoti Malhotra Ashley Mallat P. Akhila Srinivas James E. Thompson 《Bioorganic & medicinal chemistry letters》2018,28(15):2655-2659
Mitophagy is one of the processes that cells use to maintain overall health. An E3 ligase, parkin, ubiquitinates mitochondrial proteins prior to their degradation by autophagasomes. USP30 is an enzyme that de-ubiquitinates mitochondrial proteins; therefore, inhibiting this enzyme could foster mitophagy. Herein, we disclose the structure–activity relationships (SAR) within a novel series of highly selective USP30 inhibitors. Two structurally similar compounds, MF-094 (a potent and selective USP30 inhibitor) and MF-095 (a significantly less potent USP30 inhibitor), serve as useful controls for biological evaluation. We show that MF-094 increases protein ubiquitination and accelerates mitophagy. 相似文献
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Anand Akhila 《Phytochemistry》1985,24(11):2585-2587
Use of [14C,3H]-labelled precursors revealed that leaf blades of Cymbopogon flexuosus converted geraniol (3,7-dimethylocta-trans-2,6-diene-1-ol) into citral-trans with loss of pro-(1S) hydrogen whereas nerol lost the pro-(1R) hydrogen while being converted into citral-cis. Secondly, the citral-trans is converted into citral-cis and vice versa and there is no separate route for the biosynthesis of either of the two aldehyde isomers. 相似文献