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701.
702.
Volatile affairs in microbial interactions 总被引:1,自引:0,他引:1
Ruth Schmidt Viviane Cordovez Wietse de Boer Jos Raaijmakers Paolina Garbeva 《The ISME journal》2015,9(11):2329-2335
Microorganisms are important factors in shaping our environment. One key characteristic that has been neglected for a long time is the ability of microorganisms to release chemically diverse volatile compounds. At present, it is clear that the blend of volatiles released by microorganisms can be very complex and often includes many unknown compounds for which the chemical structures remain to be elucidated. The biggest challenge now is to unravel the biological and ecological functions of these microbial volatiles. There is increasing evidence that microbial volatiles can act as infochemicals in interactions among microbes and between microbes and their eukaryotic hosts. Here, we review and discuss recent advances in understanding the natural roles of volatiles in microbe–microbe interactions. Specific emphasis will be given to the antimicrobial activities of microbial volatiles and their effects on bacterial quorum sensing, motility, gene expression and antibiotic resistance. 相似文献
703.
Claude Lamarre Rémi Beau Viviane Balloy Thierry Fontaine Joanne Wong Sak Hoi Stéphanie Guadagnini Nadia Berkova Michel Chignard Anne Beauvais Jean-Paul Latgé 《Cellular microbiology》2009,11(11):1612-1623
Galactofuranose (Gal f ) is a major molecule found in cell wall polysaccharides, secreted glycoproteins, membrane lipophosphoglycans and sphingolipids of Aspergillus fumigatus . The initial step in the Galf synthetic pathway is the re-arrangement of UDP-galactopyranose to UDP-Galf through the action of UDP-galactopyranose mutase. A mutant lacking the Af UGM1 gene encoding the UDP-galactopyranose mutase has been constructed. In the mutant, though there is a moderate reduction in the mycelial growth associated with an increased branching, it remains as pathogenic and as resistant to cell wall inhibitors and phagocytes as the wild-type parental strain. The major phenotype seen is a modification of the cell wall surface that results in an increase in adhesion of the mutants to different inert surfaces (glass and plastic) and epithelial respiratory cells. The adhesive phenotype is due to the unmasking of the mannan consecutive to the removal of galactofuran by the ugm1 mutation. Removal of the mannan layer from the mutant surface by a mannosidase treatment abolishes mycelial adhesion to surfaces. 相似文献
704.
705.
Silva Bagnolia A.; Nouailhetas Viviane L. A.; Aboulafia Jeannine 《American journal of physiology. Cell physiology》1999,277(4):C739
Desensitization of ANG II tonic contractile response of theguinea pig ileum is related to membrane repolarization determined byCa2+-activatedK+(maxi-K+) channelopening. ANG II-stimulated depolarized myocytes presented sustainedactivation of maxi-K+ channels,characterized by reduction from 415 to 12 ms of the closed timeconstant. ANG II desensitization was prevented by 100 nM iberiotoxin,being reversible within 30 min. Depolarization by KCl, higher than 4 mM, impaired desensitization, suggesting that the membrane potentialmust attain a threshold to counteract the repolarization induced bymaxi-K+ channel opening. Once thisvalue is attained, there is no time dependency because thedesensitization process was shut off by addition of KCl along the timecourse of the tonic response. In contrast, the sustained ACh toniccomponent was not altered by these maneuvers. We conclude thatdesensitization of the ANG II tonic component is foremost due to theopening of maxi-K+ channels,leading to membrane repolarization, thus closing the voltage-dependentCa2+ channels responsible for theCa2+ influx that sustains thetonic component in this muscle. 相似文献
706.
João Paulo C de Oliveira Flora Fernandes Angela K Cruz Viviane Trombela Elisângela Monteiro Anamaria A Camargo Aldina Barral Camila I de Oliveira 《Kinetoplastid biology and disease》2007,6(1):5