In addition to protection against the active oxygen species, some efflux pumps may export host-derived antimicrobial agents in addition to antibiotics, bile and other substances, hence protecting from such naturally produced molecules of the host.
In particular, ABC and MFS transporters are the major families involved [ 54- 56] as they are required to export host-specific toxins (HSTs) and mycotoxins [ 57- 59], remove inhibitory defense compounds such as phytoalexins produced by the host plant [ 60], and confer resistance to fungicides [ 61].
Recently, it has been reported that MDR permeases also export host-derived antimicrobial agents, and it has been suggested that the physiological role of these systems is to evade naturally produced antimicrobial molecules, thereby allowing the bacterium to survive in a special ecological niche or host [ 63].
In 2015, China accounted for 59% of world production and for 74% of world exports, hosting the largest producers (Table 4).
In plant pathogens, cellular transporters are responsible not only for export of compounds involved in pathogenesis and virulence, but they also may play an essential role in protection against plant defense compounds (e.g., secondary metabolites) during pathogenesis, possibly by exporting host-derived antimicrobial compounds out of the cell [ 57– 57].
Alternatively, Crm1 dimerization may modulate levels of nuclear export for host mRNAs.
Our study emphasizes the importance of an AcrAB-TolC type system for improved tolerance and export in host engineering, and shows that directed evolution remains a powerful tool to obtain improved variants of such systems.
Productive infection by bacterial pathogens relies on the expression of virulence factors that have wide ranging functions like competence, adherence, capsule synthesis and export, evading host immune responses etc. Transcription profiling of the response of a bovine P. multocida isolate (L386) to MIC of eight different antibiotics identified mostly reduced virulence gene expression [ 12].
We can't restore growth and rebalance the economy without a healthy higher education sector (in its own right a major export earner) hosting a strong science base, in turn strongly connected to a revitalised downstream R&D effort.
This AP is responsible for processing Plasmodium effector proteins in a step that is crucial for their export into the host red blood cell, thereby reprogramming the host cell to meet the demands of the parasite.
Because B. aphidicola is an obligately vertically transmitted microbe with a small effective population size, any short-term growth advantage of reduced EAA export to the host would rapidly translate into depressed fitness of both the host and its bacterial complement.
