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11.
Monzote Fidalgo L Montalvo Alvarez AM Geigel LF Pérez Pineiro R Suárez Navarro M Rodríguez Cabrera H 《Memórias do Instituto Oswaldo Cruz》2004,99(3):329-330
Current therapy for leishmaniasis is not satisfactory. We describe the in vitro antiproliferative effects of new thiadiazine derivatives against Leishmania amazonensis. The compounds were found to be active against the amastigote form of the parasite, inhibiting parasite growing, from 10 to 89%, at a concentration of 100 ng/ml. This activity suggests that thiadiazine derivatives could be considered as potential antileishmanial compounds. 相似文献
12.
Camilo Ayra-Pardo Maria E. Ochagavia Ben Raymond Asim Gulzar Lianet Rodriguez-Cabrera Claudia Rodriguez de la Noval Ivis Moran Bertot Ryohei Terauchi Kentaro Yoshida Hideo Matsumura Pilar Tellez Rodriguez Daily Hernandez Hemandez Orlando Borras-Hidalgo Denis J. Wright 《Insect Science》2019,26(3):479-498
13.
Irene Jiménez-Guerrero Monica Sonawane Noam Eckshtain-Levi Za Khai Tuang Gustavo Mateus da Silva Francisco Pérez-Montaño Meirav Leibman-Markus Rupali Gupta Lianet Noda-Garcia Maya Bar Saul Burdman 《The Plant journal : for cell and molecular biology》2024,117(2):516-540
Bacterial fruit blotch, caused by Acidovorax citrulli, is a serious disease of melon and watermelon. The strains of the pathogen belong to two major genetic groups: group I strains are strongly associated with melon, while group II strains are more aggressive on watermelon. A. citrulli secretes many protein effectors to the host cell via the type III secretion system. Here we characterized AopW1, an effector that shares similarity to the actin cytoskeleton-disrupting effector HopW1 of Pseudomonas syringae and with effectors from other plant-pathogenic bacterial species. AopW1 has a highly variable region (HVR) within amino acid positions 147 to 192, showing 14 amino acid differences between group I and II variants. We show that group I AopW1 is more toxic to yeast and Nicotiana benthamiana cells than group II AopW1, having stronger actin filament disruption activity, and increased ability to induce cell death and reduce callose deposition. We further demonstrated the importance of some amino acid positions within the HVR for AopW1 cytotoxicity. Cellular analyses revealed that AopW1 also localizes to the endoplasmic reticulum, chloroplasts, and plant endosomes. We also show that overexpression of the endosome-associated protein EHD1 attenuates AopW1-induced cell death and increases defense responses. Finally, we show that sequence variation in AopW1 plays a significant role in the adaptation of group I and II strains to their preferred hosts, melon and watermelon, respectively. This study provides new insights into the HopW1 family of bacterial effectors and provides first evidence on the involvement of EHD1 in response to biotic stress. 相似文献
14.
Inge Schwedt Kerstin Schöne Maike Eckert Manon Pizzinato Laura Winkler Barbora Knotkova Björn Richts Jann-Louis Hau Julia Steuber Raul Mireles Lianet Noda-Garcia Günter Fritz Carolin Mittelstädt Robert Hertel Fabian M. Commichau 《Environmental microbiology》2023,25(12):3604-3622
Glyphosate (GS) inhibits the 5-enolpyruvyl-shikimate-3-phosphate (EPSP) synthase that is required for aromatic amino acid, folate and quinone biosynthesis in Bacillus subtilis and Escherichia coli. The inhibition of the EPSP synthase by GS depletes the cell of these metabolites, resulting in cell death. Here, we show that like the laboratory B. subtilis strains also environmental and undomesticated isolates adapt to GS by reducing herbicide uptake. Although B. subtilis possesses a GS-insensitive EPSP synthase, the enzyme is strongly inhibited by GS in the native environment. Moreover, the B. subtilis EPSP synthase mutant was only viable in rich medium containing menaquinone, indicating that the bacteria require a catalytically efficient EPSP synthase under nutrient-poor conditions. The dependency of B. subtilis on the EPSP synthase probably limits its evolvability. In contrast, E. coli rapidly acquires GS resistance by target modification. However, the evolution of a GS-resistant EPSP synthase under non-selective growth conditions indicates that GS resistance causes fitness costs. Therefore, in both model organisms, the proper function of the EPSP synthase is critical for the cellular viability. This study also revealed that the uptake systems for folate precursors, phenylalanine and tyrosine need to be identified and characterized in B. subtilis. 相似文献