PUBLICATION
Methyltransferase SMYD3 impairs hypoxia tolerance by augmenting hypoxia signaling independent of its enzymatic activity
- Authors
- Wang, Z., Chen, X., Fan, S., Zhu, C., Deng, H., Tang, J., Sun, X., Jia, S., Liao, Q., Xiao, W., Liu, X.
- ID
- ZDB-PUB-221025-2
- Date
- 2022
- Source
- The Journal of biological chemistry 298(12): 102633 (Journal)
- Registered Authors
- Xiao, Wuhan
- Keywords
- HIF1α, ROS, SMYD3, hypoxia signaling, hypoxia tolerance, zebrafish
- MeSH Terms
-
- Animals
- Histone-Lysine N-Methyltransferase*/genetics
- Histone-Lysine N-Methyltransferase*/metabolism
- Hypoxia*/metabolism
- Hypoxia-Inducible Factor 1, alpha Subunit/genetics
- Hypoxia-Inducible Factor 1, alpha Subunit/metabolism
- Methyltransferases*/metabolism
- Signal Transduction
- Von Hippel-Lindau Tumor Suppressor Protein/genetics
- Von Hippel-Lindau Tumor Suppressor Protein/metabolism
- Zebrafish/metabolism
- Zebrafish Proteins*/genetics
- Zebrafish Proteins*/metabolism
- PubMed
- 36273580 Full text @ J. Biol. Chem.
Citation
Wang, Z., Chen, X., Fan, S., Zhu, C., Deng, H., Tang, J., Sun, X., Jia, S., Liao, Q., Xiao, W., Liu, X. (2022) Methyltransferase SMYD3 impairs hypoxia tolerance by augmenting hypoxia signaling independent of its enzymatic activity. The Journal of biological chemistry. 298(12):102633.
Abstract
HIF1α, a main transcriptional regulator of the cellular response to hypoxia, also plays important roles in oxygen homeostasis of aerobic organisms, which is regulated by multiple mechanisms. However, the full cellular response to hypoxia has not been elucidated. In this study, we found that expression of SMYD3, a methyltransferase, augments hypoxia signaling independent of its enzymatic activity. We demonstrated SMYD3 binds to and stabilizes HIF1α via co-immunoprecipitation and Western blot assays, leading to the enhancement of HIF1α transcriptional activity under hypoxia conditions. In addition, the stabilization of HIF1α by SMYD3 is independent of HIF1α hydroxylation by prolyl hydroxylases (PHDs) and the intactness of the von Hippel-Lindau (VHL) ubiquitin ligase complex. Furthermore, we showed SMYD3 induces ROS accumulation and promotes hypoxia-induced cell apoptosis. Consistent with these results, we found smyd3-null zebrafish exhibit higher hypoxia tolerance compared to their wildtype siblings. Together, these findings define a novel role of SMYD3 in affecting hypoxia signaling and demonstrate that SMYD3-mediated HIF1α stabilization augments hypoxia signaling, leading to the impairment of hypoxia tolerance.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping