Differential Roles for Six P-Type Calcium ATPases in Sustaining Intracellular Ca2+ Homeostasis, Asexual Cycle and Environmental Fitness of Beauveria bassiana.


:A global insight into the roles of multiple P-type calcium ATPase (CA) pumps in sustaining the life of a filamentous fungal pathogen is lacking. Here we elucidated the functions of five CA pumps (Eca1, Spf1 and PmcA/B/C) following previous characterization of Pmr1 in Beauveria bassiana, a fungal insect pathogen. The fungal CA pumps interacted at transcriptional level, at which singular deletions of five CA genes depressed eca1 expression by 76-98% and deletion of spf1 resulted in drastic upregulation of four CA genes by 36-50-fold. Intracellular Ca2+ concentration increased differentially in most deletion mutants exposed to the stresses of Ca2+, EDTA chelator, and/or endoplasmic reticulum and calcineurin inhibitors, accompanied with their changed sensitivities to not only the mentioned agents but also Fe2+, Cu2+ and Zn2+. Liquid culture acidification was delayed in the Δspf1, Δpmr1 and ΔpmcA mutants, coinciding well with altered levels of their extracellular lactic and oxalic acids. Moreover, all deletion mutants showed differential defects in conidial germination, vegetative growth, conidiation capacity, antioxidant activity, cell wall integrity, conidial UV-B resistance and/or virulence. Our results provide the first global insight into differential roles for six CA pumps in sustaining intracellular Ca2+ level, asexual cycle and environmental fitness of B. bassiana.


Sci Rep


Scientific reports


Wang J,Zhu XG,Ying SH,Feng MG




Has Abstract


2017-05-03 00:00:00












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