The sulfur metabolism regulator MetR is a global regulator controlling phytochrome-dependent light responses in Aspergillus nidulans

• 作者: Zhenzhong Yu Jia Gao Olumuyiwa Igbalajobi Marek Skoneczny Marzena Sienko Agnieszka M.Maciejewska Jerzy Brzywczy Reinhard Fischer
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ARTICLES
• 页码范围: 592-602
• 页数: 11页
• 语种: 英文

摘要

Phytochrome-dependent light signaling has been studied in several fungi.In Aspergillus nidulans light-stimulated phytochrome activates the high-osmolarity glycerol(HOG)signaling pathway and thereby controls the expression of a large number of genes,many of which are related to stress responses.In a genome-wide expression analysis in A.nidulans we found that phytochrome,fphA,is under strict expres-sion control of the central regulator of the sulfur-starvation response,MetR.This transcriptional regulator is required for the expression of genes involved in inorganic sulfur assimilation.In the presence of organic sulfur,MetR is probably ubiquitinated and possibly degraded and the transcription of sulfur-assimilation genes,e.g.,sulfate permease,is turned off.The expression analysis described here revealed,however,that MetR additionally controls the expression of hundreds of genes,many of which are required for sec-ondary metabolite production.We also show that metR mutation phenocopies fphA deletion,and five other histidine-hybrid kinases are down-regulated in the metR1 mutant.Furthermore,we found that light and phytochrome regulate the expression of at least three carbon-sulfur hydrolases.This work is a fur-ther step towards understanding the interplay between light sensing and metabolic pathways.