文献类型：期刊文献

英文题名：Induction of cellulase production by Sr2+ in Trichoderma reesei via calcium signaling transduction

作者：Li, Ni[1];Zeng, Yi[1];Chen, Yumeng[1];Shen, Yaling[1];Wang, Wei[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, New World Inst Biotechnol, Shanghai 200237, Peoples R China

年份：2022

卷号：9

期号：1

外文期刊名：BIORESOURCES AND BIOPROCESSING

收录：;EI(收录号：20224513081499);WOS:【SCI-EXPANDED(收录号:WOS:000850562500001)】；

基金：This research was funded by the Shanghai Agriculture Applied Technology Development Program, China (Grant No. 2021-02-08-00-12-F00758), Natural Science Foundation of Shanghai (22ZR1417600), and National Natural Science Foundation of China (32000050).

语种：英文

外文关键词：Trichoderma reesei; Sr2+; Cellulase; ROS; Calcium signaling; Signal transduction

摘要：Trichoderma reesei RUT-C30 is a well-known high-yielding cellulase-producing fungal strain that converts lignocellulose into cellulosic sugar for resource regeneration. Calcium is a ubiquitous secondary messenger that regulates growth and cellulase production in T. reesei. We serendipitously found that adding Sr2+ to the medium significantly increased cellulase activity in the T reesei RUT-C30 strain and upregulated the expression of cellulase-related genes. Further studies showed that Sr2+ supplementation increased the cytosolic calcium concentration and activated the calcium-responsive signal transduction pathway of Ca2+-calcineurin-responsive zinc finger transcription factor 1 (CRZ1). Using the plasma membrane Ca2+ channel blocker, LaCl3, we demonstrated that Sr2+ induces cellulase production via the calcium signaling pathway. Supplementation with the corresponding concentrations of Sr2+ also inhibited colony growth. Sr2+ supplementation led to an increase in intracellular reactive oxygen species (ROS) and upregulated the transcriptional levels of intracellular superoxide dismutase (sod 1) and catalase (cat1). We further demonstrated that ROS content was detrimental to cellulase production, which was alleviated by the ROS scavenger N-acetyl cysteine (NAC). This study demonstrated for the first time that Sr2+ supplementation stimulates cellulase production and upregulates cellulase genes via the calcium signaling transduction pathway. Sr2+ leads to an increase in intracellular ROS, which is detrimental to cellulase production and can be alleviated by the ROS scavenger NAC. Our results provide insights into the mechanistic study of cellulase synthesis and the discovery of novel inducers of cellulase.