Characterization the response of <i>Chlamydomonas reinhardtii</i> serine/threonine protein kinase mutant to blue light.

Wangning LI; Mengjing Liang; Ze Yang; Yanan LI; Chunhui Zhang; Chunli JI; Runzhi LI; Song Qin; Jinai Xue; Hongli Cui

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Characterization the response of Chlamydomonas reinhardtii serine/threonine protein kinase mutant to blue light.

Author: Wangning LI ¹ ; Mengjing LIANG ¹ ; Ze YANG ¹ ; Yanan LI ¹ ; Chunhui ZHANG ¹ ; Chunli JI ¹ ; Runzhi LI ¹ ; Song QIN ² ; Jinai XUE ¹ ; Hongli CUI ¹
Author Information

1. Institute of Molecular Agriculture and Bioenergy, College of Agriculture, Shanxi Agricultural University, Taigu 030801, Shanxi, China.
2. Key Laboratory of Coastal Biology and Biological Resources Utilization, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, Shandong, China.
Publication Type:Journal Article
Keywords: Chlamydomonas reinhardtii; blue light stress; differential expression gene; serine/threonine protein kinase; transcriptome analysis
MeSH: Chlamydomonas reinhardtii/genetics*; Photosynthesis/genetics*; Plants/metabolism*; Protein Kinases; Threonine/metabolism*; Carbon/metabolism*; Serine/metabolism*
From: Chinese Journal of Biotechnology 2023;39(11):4563-4579
CountryChina
Language:Chinese
Abstract: In order to investigate the molecular mechanism of silk/threonine protein kinase (STK)-mediated blue light response in the algal Chlamydomonas reinhardtii, phenotype identification and transcriptome analysis were conducted for C. reinhardtii STK mutant strain crstk11 (with an AphvIII box reverse insertion in stk11 gene coding region) under blue light stress. Phenotypic examination showed that under normal light (white light), there was a slight difference in growth and pigment contents between the wild-type strain CC5325 and the mutant strain crstk11. Blue light inhibited the growth and chlorophyll synthesis in crstk11 cells, but significantly promoted the accumulation of carotenoids in crstk11. Transcriptome analysis showed that 860 differential expression genes (DEG) (559 up-regulated and 301 down-regulated) were detected in mutant (STK4) vs. wild type (WT4) upon treatment under high intensity blue light for 4 days. After being treated under high intensity blue light for 8 days, a total of 1 088 DEGs (468 upregulated and 620 downregulated) were obtained in STK8 vs. WT8. KEGG enrichment analysis revealed that compared to CC5325, the crstk11 blue light responsive genes were mainly involved in catalytic activity of intracellular photosynthesis, carbon metabolism, and pigment synthesis. Among them, upregulated genes included psaA, psaB, and psaC, psbA, psbB, psbC, psbD, psbH, and L, petA, petB, and petD, as well as genes encoding ATP synthase α, β and c subunits. Downregulated genes included petF and petJ. The present study uncovered that the protein kinase CrSTK11 of C. reinhardtii may participate in the blue light response of algal cells by mediating photosynthesis as well as pigment and carbon metabolism, providing new knowledge for in-depth analysis of the mechanism of light stress resistance in the algae.