Download MendeleyThe NAMPT enzyme employs a switch that directly senses AMP/ATP and regulates cellular responses to energy stress.
Zu, Y., Wu, C., Li, F., Yao, H., Xia, Y., Zhang, R., Li, L., Chen, S., Shi, Q., Xi, S., Pang, H., Liu, M., Wang, L., Terpack, S., Wang, W., Chen, S., Zhang, H., Wang, Y., Yang, M., Huang, S., Zhou, F., Tang, Y., Hu, Z., Fan, S., Tang, Y., Lee, Y.S., Wang, G.(2025) Mol Cell 85: 2271-2286.e6
- PubMed: 40505662 Search on PubMed
- DOI: https://doi.org/10.1016/j.molcel.2025.05.022
- Primary Citation Related Structures:
9IWT - PubMed Abstract:
Nicotinamide adenine dinucleotide (NAD + ) is a crucial compound in energy metabolism and cell signaling. Nicotinamide phosphoribosyltransferase (NAMPT) is the rate-limiting enzyme responsible for NAD + biosynthesis from nicotinamide (NAM). Here, we report that NAMPT activity is inhibited by adenosine monophosphate (AMP) in response to energy stress. Our global metabolite-protein interaction mapping reveals that NAMPT differentially interacts with AMP from fasted mouse livers. Crystal structures of NAMPT-AMP show that AMP binds similarly to the NAMPT reaction product, nicotinamide mononucleotide (NMN). The inhibition of NAMPT by AMP can be relieved by NAMPT activators or adenosine triphosphate (ATP), likely in a competitive manner. Based on these findings, we further investigated upstream factors contributing to AMP accumulation and found that activation of purine synthesis unexpectedly promotes the rise of AMP during fasting. Notably, an increased AMP/ATP ratio correlates with NAD + decline in ischemic stroke models, in which NAMPT activators can otherwise confer protection.
- Institute for Translational Medicine on Cell Fate and Disease, Shanghai Ninth People's Hospital, Key Laboratory of Cell Differentiation and Apoptosis of National Ministry of Education, Department of Pathophysiology, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China; School of Pharmaceutical Sciences, Beijing Frontier Research Center for Biological Structure, Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing 100084, China.
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