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Hyunah Kim 2 Articles
Functional analysis of Mpk1-mediated cell wall integrity signaling pathway in the thermotolerant methylotrophic yeast Hansenula polymorpha
Hyunah Kim , Eun Jung Thak , Ji Yoon Yeon , Min Jeong Sohn , Jin Ho Choo , Jeong-Yoon Kim , Hyun Ah Kang
J. Microbiol. 2018;56(1):72-82.   Published online January 4, 2018
DOI: https://doi.org/10.1007/s12275-018-7508-6
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AbstractAbstract PDF
Understanding the characteristics and regulation mechanisms of cell wall integrity (CWI) in yeast is important not only for basic research but also in biotechnological applications. We found significantly different CWIs in two representative strains of the thermotolerant methylotrophic yeast Hansenula polymorpha. Compared to the A16 strain (classified as Ogataea polymorpha), the DL1-L strain (classified as Ogataea parapolymorpha) has a thinner cell wall that was found to be more fragile following long-term cultivation and more sensitive to zymolyase. To gain a deeper insight into this difference, we compared the characteristics of the Mpk1pmediated CWI signaling pathway in the two strains. While a DL1-L mutant deficient in Mpk1p (mpk1Δ) showed severe growth retardation at both normal and high growth temperatures and in the presence of cell-wall disrupting agents, the A16 mpk1Δ mutant displayed only a mild defect in cell growth. Sorbitol effect on rescuing growth retardation was different in the two mpk1Δ strains, which could partly be ascribed to subtle differences in the activation of HOG pathway. Among the cell wall disruptors evaluated, only caffeine clearly increased phosphorylation of Mpk1p in DL1-L, but not in A16. A transcriptome analysis of the DL1-L strain revealed that caffeine significantly increased the expression of a subset of cell-wall related genes in an Mpk1p-dependent manner, but not the expected Rlm1-target genes. Taken together, our data support an essential role for Mpk1p in maintaining CWI in H. polymorpha, although the requirement for Mpk1p and its regulation under diverse stress conditions varies depending on the strain background.

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    Shaokai Li, Lixia Pan, Bin Zhang, Jie Bao
    Biochemical Engineering Journal.2026; 234: 110293.     CrossRef
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    Roghayeh Shirvani, Maryam Babaei, Motahare Baladi, Matthias G Steiger, Mohammad Barshan-tashnizi
    FEMS Yeast Research.2025;[Epub]     CrossRef
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  • Characterization, expression patterns and functional analysis of PcMPK12 gene in Phytophthora capsici
    Tong-tong Zhu, Sheng-han Xiang, Lei Yang, Fang Tang, Wei Li, Ying-bao Liu, Wen-xiu Sun
    European Journal of Plant Pathology.2022; 164(4): 525.     CrossRef
  • The cell wall and the response and tolerance to stresses of biotechnological relevance in yeasts
    Ricardo A. Ribeiro, Nuno Bourbon-Melo, Isabel Sá-Correia
    Frontiers in Microbiology.2022;[Epub]     CrossRef
  • The damage and tolerance mechanisms of Phaffia rhodozyma mutant strain MK19 grown at 28 °C
    Li-Li Miao, Shuang Chi, Ting-Ting Hou, Zhi-Pei Liu, Ying Li
    Microbial Cell Factories.2021;[Epub]     CrossRef
  • Molecular characterization of Hsf1 as a master regulator of heat shock response in the thermotolerant methylotrophic yeast Ogataea parapolymorpha
    Jin Ho Choo, Su-Bin Lee, Hye Yun Moon, Kun Hwa Lee, Su Jin Yoo, Keun Pil Kim, Hyun Ah Kang
    Journal of Microbiology.2021; 59(2): 151.     CrossRef
  • Pleiotropic Effects of Caffeine Leading to Chromosome Instability and Cytotoxicity in Eukaryotic Microorganisms
    Woo-Hyun Chung
    Journal of Microbiology and Biotechnology.2021; 31(2): 171.     CrossRef
  • Short bZIP homologue of sulfur regulator Met4 from Ogataea parapolymorpha does not depend on DNA‐binding cofactors for activating genes in sulfur starvation
    Su Jin Yoo, Min Jeong Sohn, Da Min Jeong, Hyun Ah Kang
    Environmental Microbiology.2020; 22(1): 310.     CrossRef
  • PlMAPK10, a Mitogen-Activated Protein Kinase (MAPK) in Peronophythora litchii, Is Required for Mycelial Growth, Sporulation, Laccase Activity, and Plant Infection
    Liqun Jiang, Junjian Situ, Yi Zhen Deng, Lang Wan, Dandan Xu, Yubin Chen, Pinggen Xi, Zide Jiang
    Frontiers in Microbiology.2018;[Epub]     CrossRef
Remodeling of the Glycosylation Pathway in the Methylotrophic Yeast Hansenula polymorpha to Produce Human Hybrid-Type N-Glycans
Seon Ah Cheon , Hyunah Kim , Doo-Byoung Oh , Ohsuk Kwon , Hyun Ah Kang
J. Microbiol. 2012;50(2):341-348.   Published online April 27, 2012
DOI: https://doi.org/10.1007/s12275-012-2097-2
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AbstractAbstract PDF
As a step forward to achieve the generation of human complex- type N-glycans in the methylotrophic yeast Hansenula polymorpha, we here report the modification of the yeast glycosylation pathway by heterologous expression of the human gene encoding β-1,2-N-acetylglucosaminyltransferase I (GnTI). For the optimal expression of human GnTI in the yeast Golgi compartment, the catalytic domain of the GnTI was fused to various N-terminal leader sequences derived from the yeast type II membrane proteins. The vectors containing GnTI fusion constructs were introduced into the H. polymorpha och1Δ single and och1Δalg3Δ double mutant strains expressing the ER-targeted Aspergillus saitoi α-1,2 mannosidase, respectively. Both of the glycoengineered Hpoch1Δ and Hpoch1ΔHpalg3Δ strains were shown to produce successfully the hybrid-type glycans with a monoantennary N-acetylglucosamine (GlcNAc1Man5GlcNAc2 and GlcNAc1Man3GlcNAc2, respectively) by N-glycan profile analysis of cell wall proteins. Furthermore, by comparative analysis of byproduct formation and the glycosylation site occupancy, we propose that the Hpoch1Δ strain would be more suitable than the Hpoch1ΔHpalg3Δ strain as a host for the production of recombinant proteins with humanized glycans.

Citations

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    Chemical Engineering Journal.2025; 526: 171510.     CrossRef
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    World Journal of Microbiology and Biotechnology.2024;[Epub]     CrossRef
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    Mari A Piirainen, Alexander D Frey
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  • Advances in Using Hansenula polymorpha as Chassis for Recombinant Protein Production
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