9HIB
K115 acetylated human muscle pyruvate kinase, isoform M2 (PKM2)
Summary for 9HIB
| Entry DOI | 10.2210/pdb9hib/pdb |
| Descriptor | Pyruvate kinase PKM, GLYCEROL, 1,2-ETHANEDIOL, ... (8 entities in total) |
| Functional Keywords | acetylation, post-translational modification, glycolysis, genetic code expansion, acetylated lysine, metabolism, transferase |
| Biological source | Homo sapiens (human) |
| Total number of polymer chains | 4 |
| Total formula weight | 236961.90 |
| Authors | Pavlenko, D.,Nudelman, H.,Shahar, A.,Arbely, E. (deposition date: 2024-11-25, release date: 2025-11-05, Last modification date: 2025-12-10) |
| Primary citation | Pavlenko, D.,Tamargo-Azpilicueta, J.,Nudelman, H.,Ankri, Y.,Shahar, A.,Diaz-Moreno, I.,Arbely, E. Isoform-specific regulation of PKM by acetylation. Proc.Natl.Acad.Sci.USA, 122:e2527086122-e2527086122, 2025 Cited by PubMed Abstract: Pyruvate kinase (PK) is a crucial glycolytic protein involved in vital cellular processes ranging from cell proliferation to immune responses. The activity and functions of PK are tightly regulated by diverse mechanisms, including posttranslational Nϵ-lysine acetylation. Although previous studies have explored the impact of acetylation on selected lysine residues within the M2 isoform of PK (PKM2), a more comprehensive selection of acetylation sites and their respective effects on both PKM2 and the highly homologous PKM1 isoform is lacking. Here, we describe the structural, functional, and regulatory effects of site-specific acetylation on an expanded set of conserved lysines in PKM2 and selected lysines in PKM1. To study homogeneously acetylated proteins, we genetically encoded the incorporation of acetylated lysine into PKM variants expressed in bacteria and cultured mammalian cells. Our integrated biochemical, structural, and computational approach revealed K115 acetylation as an inhibitory modification in both PKM1 and PKM2 that stabilizes a closed active site conformation of the proteins. We also show that, in contrast to K115 acetylation, previously reported acetylation of K305 inhibits PKM2 but has no effect on the activity and oligomerization of PKM1. These findings propose the existence of both uniform and isoform-specific regulatory mechanisms of PKM, mediated by acetylation. PubMed: 41289402DOI: 10.1073/pnas.2527086122 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.17 Å) |
Structure validation
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