Journal of Microbiology

Daehee Jung

4 Articles

Fus3 and Tpk2 protein kinases regulate the phosphorylation-dependent functions of RNA helicase Dhh1 in yeast mating and Ste12 protein expression: Jaehee Hwang , Daehee Jung , Jinmi Kim; J. Microbiol. 2022;60(8):843-848. Published online July 14, 2022; DOI: https://doi.org/10.1007/s12275-022-2213-x

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Abstract PDF: Decapping of mRNA is a key regulatory step for mRNA decay and translation. The RNA helicase, Dhh1, is known as a decapping activator and translation repressor in yeast Saccharomyces cerevisiae. Dhh1 also functions as a gene-specific positive regulator in the expression of Ste12, a mating-specific transcription factor. A previous study showed that the Nerminal phosphorylation of Dhh1 regulates its association with the mRNA-binding protein, Puf6, to affect the protein translation of Ste12. Here, we investigated the roles of the phosphorylated residues of Dhh1 in yeast mating process and Ste12 expression. The phospho-deficient mutation, DHH1- T10A, was associated with decreased diploid formation during mating and decreased level of the Ste12 protein in response to α-mating pheromone. A kinase overexpression analysis revealed that Ste12 protein expression was affected by overexpression of Fus3 MAP kinase or Tpk2 kinase. Tpk2 was shown to be responsible for phosphorylation of Dhh1 at Thr10. Our study shows that overexpression of Fus3 or Tpk2 alters the Dhh1-Puf6 protein interaction and thereby affects Ste12 protein expression.

Roles of Dhh1 RNA helicase in yeast filamentous growth: Analysis of N-terminal phosphorylation residues and ATPase domains: Eunji Lee , Daehee Jung , Jinmi Kim; J. Microbiol. 2020;58(10):853-858. Published online September 29, 2020; DOI: https://doi.org/10.1007/s12275-020-0431-7

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In yeast Saccharomyces cerevisiae, the Dhh1 protein, a member of the DEAD-box RNA helicase, stimulates Dcp2/Dcp1- mediated mRNA decapping and functions as a general translation repressor. Dhh1 also positively regulates translation of a selected set of mRNAs, including Ste12, a transcription factor for yeast mating and pseudohyphal growth. Given the diverse functions of Dhh1, we investigated whether the putative phosphorylation sites or the conserved motifs for the DEADbox RNA helicases were crucial in the regulatory roles of Dhh1 during pseudohyphal growth. Mutations in the ATPase A or B motif (DHH1-K96R or DHH1-D195A) showed significant defects in pseudohyphal colony morphology and agar invasive phenotypes. The N-terminal phospho-mimetic mutation, DHH1-T16E, showed defects in pseudohyphal phenotypes. Decreased levels of Ste12 protein were also observed in these pseudohyphal-defective mutant cells under filamentous- inducing low nitrogen conditions. We suggest that the ATPase motifs and the Thr16 phosphorylation site of Dhh1 are crucial to its regulatory roles in pseudohyphal growth under low nitrogen conditions.

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Roles of P-body factors in Candida albicans filamentation and stress response
Melissa A. Tosiano, Frederick Lanni, Aaron P. Mitchell, C. Joel McManus, Guilhem Janbon
PLOS Genetics.2025; 21(3): e1011632. CrossRef
Biological implications of decapping: beyond bulk mRNA decay
Fivos Borbolis, Popi Syntichaki
The FEBS Journal.2022; 289(6): 1457. CrossRef
The Complex Genetic Basis and Multilayered Regulatory Control of Yeast Pseudohyphal Growth
Anuj Kumar
Annual Review of Genetics.2021; 55(1): 1. CrossRef

Roles of eIF4E-binding protein Caf20 in Ste12 translation and P-body formation in yeast: Kiyoung Park , Yu-Seon Lee , Daehee Jung , Jinmi Kim; J. Microbiol. 2018;56(10):744-747. Published online August 22, 2018; DOI: https://doi.org/10.1007/s12275-018-8230-0

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Abstract PDF

Translation initiation factor eIF4E forms eIF4E-eIF4G complex at the 5’ cap of mRNA. This interaction can be inhibited by the family of 4E-binding proteins (4E-BP). In yeast Saccharomyces cerevisiae, two 4E-BPs, Caf20 and Eap1, compete with eIF4G for binding to eIF4E via the shared conserved interaction motif. In order to investigate the roles of Caf20 in gene-specific translational regulation and the formation of mRNA granules (P-bodies), we introduced substitution mutations, caf20-Y4A or caf20-L9A, in the eIF4E-binding motif for CAF20. Overexpression of the wild-type CAF20 showed an increased protein level of Ste12 transcription factor as well as highly developed P-body formation. However, 4E-binding site mutations of CAF20 led to a reduced number of P-body foci and decreased levels of Ste12 protein. The phenotypes of the caf20 deletion mutation were also analyzed, and we suggest that Caf20 plays a critical role in Ste12 protein expression and in the control of P-body formation.

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Long Noncoding RNAs Responding to Ethanol Stress in Yeast Seem Associated with Protein Synthesis and Membrane Integrity
Amanda Piveta Schnepper, Agatha M. S. Kubo, Camila Moreira Pinto, Ramon Hernany Martins Gomes, Matheus Naia Fioretto, Luís Antonio Justulin, Aline M. M. Braz, Marjorie de Assis Golim, Rejane M. T. Grotto, Guilherme Targino Valente
Genes.2025; 16(2): 170. CrossRef
Proteomic analysis revealed the roles of YRR1 deletion in enhancing the vanillin resistance of Saccharomyces cerevisiae
Wenyan Cao, Weiquan Zhao, Bolun Yang, Xinning Wang, Yu Shen, Tiandi Wei, Wensheng Qin, Zailu Li, Xiaoming Bao
Microbial Cell Factories.2021;[Epub] CrossRef
Functional association of Loc1 and Puf6 with RNA helicase Dhh1 in translational regulation of Saccharomyces cerevisiae Ste12
Daehee Jung, Jong Seok Seo, Jayoung Nam, Jinmi Kim, Enrico Baruffini
PLOS ONE.2019; 14(7): e0220137. CrossRef

Mutational analysis of the RNA helicase Dhh1 in Ste12 expression and yeast mating: Daehee Jung , Jihye Ahn , Boram Rhee , Jinmi Kim; J. Microbiol. 2017;55(5):373-378. Published online April 29, 2017; DOI: https://doi.org/10.1007/s12275-017-7020-4

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Abstract PDF

Dhh1 and Dhh1 homologues (RCK/p54/DDX6) are mem-bers of the DEAD-box protein family of RNA helicases. These proteins display conserved sequence motifs for ATPase and RNA binding activities. Dhh1 is a component of the P-bodies (processing bodies) of mRNA granules and functions as an mRNA decapping activator in Saccharomyces cerevisiae. Dhh1 also contributes to gene-specific regulation during yeast mating. The dhh1 deletion mutation results in a significant decrease in the expression of Ste12, a mating-specific trans-cription factor, showing severe mating defects. Here, we in-troduced amino-acid substitution mutations in the ATPase and RNA binding domains of Dhh1 and also constructed a deletion of 79 amino acids at the Q/P-rich C-terminal region. The mutations in ATPase A and B motif (K96R, D195A) and C-terminus deletion showed reduced levels of mating effi-ciency as well as Ste12 protein expression. The Q/P-rich C- terminal region of Dhh1 was dispensable for growth at non- permissive temperature 37°C but appeared to play an im-portant role in regulating the Ste12 protein expression and mating processes. The P-body accumulation induced by treatment with α-mating factor required ATPase, RNA-bind-ing and the Q/P-rich C-terminal domains of Dhh1.

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Postharvest biocontrol ability and antagonistic mechanism of Streptomyces djakartensis MEPS155 against Ceratocystis fimbriata in sweetpotato
Yongjing Zhang, Xiaoying Cao, Changgen Li, Hao Cong, Yujie Chen, Qiao Liu, Yiming Wang, Hailan Fu, Jiluan Zhang, Jihong Jiang, Ludan Li
Postharvest Biology and Technology.2025; 229: 113709. CrossRef
Fus3 and Tpk2 protein kinases regulate the phosphorylation-dependent functions of RNA helicase Dhh1 in yeast mating and Ste12 protein expression
Jaehee Hwang, Daehee Jung, Jinmi Kim
Journal of Microbiology.2022; 60(8): 843. CrossRef
The Role of DEAD-Box ATPases in Gene Expression and the Regulation of RNA–Protein Condensates
Karsten Weis, Maria Hondele
Annual Review of Biochemistry.2022; 91(1): 197. CrossRef
Roles of Dhh1 RNA helicase in yeast filamentous growth: Analysis of N-terminal phosphorylation residues and ATPase domains
Eunji Lee, Daehee Jung, Jinmi Kim
Journal of Microbiology.2020; 58(10): 853. CrossRef
Functional association of Loc1 and Puf6 with RNA helicase Dhh1 in translational regulation of Saccharomyces cerevisiae Ste12
Daehee Jung, Jong Seok Seo, Jayoung Nam, Jinmi Kim, Enrico Baruffini
PLOS ONE.2019; 14(7): e0220137. CrossRef
Roles of eIF4E-binding protein Caf20 in Ste12 translation and P-body formation in yeast
Kiyoung Park, Yu-Seon Lee, Daehee Jung, Jinmi Kim
Journal of Microbiology.2018; 56(10): 744. CrossRef

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