Protein S-nitrosylation and O-GlcNAcylation are important posttranslational modifications. Biological relevance between S-nitrosylation and O-GlcNAcylation remains unclear. Our goal is to identify the crosstalk between S-nitrosylation and O-GlcNAcylation during heat-shock. Ex vivo heat-shock on mouse tissues together with in vitro heat-shock on culture cells was performed and global levels of S-nitrosylation(SNO) and O-GlcNAcylation were analyzed with Biotin-switch assay and RL2 immunoblots. We found that heat-shock induces hypo-SNO in parallel with hyper-O-GlcNAcylation. Inverted induction of hypo-SNO and hyper-O-GlcNAcylation is globally progressed in a time-dependent manner. Furthermore, heat-shock ubiquitously facilitates S-denitrosylation (SdeNO) of endogenous SNO-proteins including SNO-OGT, SNO-Hsp70, SNO-Hsp90, SNO-Akt, and SNO-actin. Particularly, SdeNO of SNO-OGT leads to enhanced OGT activity. These results provide mechanistic evidence that heat shock induces SdeNO in SNO-OGT, leading to upregulation of OGT activity, resulting in hyper-O-GlcNAcylation.
저자
Min-Jae Kim [ Department of Life Science Laboratory of Functional Glycomics, Ajou University ]
In-Hyun Ryu [ Department of Life Science Laboratory of Functional Glycomics, Ajou University ]
Su-Il Do [ Department of Life Science Laboratory of Functional Glycomics, Ajou University ]
Corresponding Author
본 학회는 화학, 생화학, 분자생물학, 미생물학, 식품공학, 의학, 약학, 유전공학 및 생물공학, 환경 및 기타 공업 등 전 분야의 탄수화물관련 이론과 기술을 연구 발전시키고 산학협동을 통해 이를 보급하여 국내 관련 산업의 발전 및 국민생활의 과학화에 기여하고자 하며, 이러한 목표와 비젼의 실현을 위해 회원들이 적극적인 참여와 활동을 전개하고자 한다.