Sensor histidine kinases (HKs) are important factors that control cellular growth in response to environmental conditions. The expression of 15 HKs from Aspergillus nidulans was analyzed by quantitative real-time PCR under vegetative, asexual, and sexual growth conditions. Most HKs were highly expressed during asexual growth. All HK gene-disrupted strains produced reactive oxygen species (ROS). Three HKs are involved in the control of ROS: HysA was the most abundant under the restricted oxygen condition, NikA is involved in fungicide sensing, and FphA inhibits sexual development in response to red light. Phosphotransfer signal transduction via HysA is essential for ROS production control.
Reactive oxygen species (ROS) are high reactive compounds, which are produced on the process of oxygen consumption in aerobic organisms. ROS can be vanished by several enzymes, but excess of ROS cause damage on the organisms by the oxidation of DNA, proteins and lipids and so on. In this short review, you will see the general information about ROS (how and where ROS are produced and vanished), and then our resent reports, which show the involvement of His-Asp phosphorelay signal transductions into the control of ROS production in Aspergillus nidulans.
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