8FYU

Crystal structure of the human CHIP-TPR domain in complex with a 10mer acetylated tau peptide

Summary for 8FYU

• Entry DOI: 10.2210/pdb8fyu/pdb
• Descriptor: E3 ubiquitin-protein ligase CHIP, ACE-SER-SER-THR-GLY-SER-ILE-ASP-MET-VAL-ASP (3 entities in total)
• Functional Keywords: e3 ligase, ligand, tpr domain, ligase
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 4
• Total formula weight: 31353.56

Authors

Wucherer, K.,Bohn, M.F.,Basu, K.,Nadel, C.M.,Gestwicki, J.E.,Craik, C.S. (deposition date: 2023-01-26, release date: 2023-08-30, Last modification date: 2024-10-16)

Primary citation

Nadel, C.M.,Pokhrel, S.,Wucherer, K.,Oehler, A.,Thwin, A.C.,Basu, K.,Callahan, M.D.,Southworth, D.R.,Mordes, D.A.,Craik, C.S.,Gestwicki, J.E.
Phosphorylation of tau at a single residue inhibits binding to the E3 ubiquitin ligase, CHIP.
Nat Commun, 15:7972-7972, 2024

PubMed Abstract: Microtubule-associated protein tau (MAPT/tau) accumulates in a family of neurodegenerative diseases, including Alzheimer's disease (AD). In disease, tau is aberrantly modified by post-translational modifications (PTMs), including hyper-phosphorylation. However, it is often unclear which of these PTMs contribute to tau's accumulation or what mechanisms might be involved. To explore these questions, we focus on a cleaved proteoform of tau (tauC3), which selectively accumulates in AD and was recently shown to be degraded by its direct binding to the E3 ubiquitin ligase, CHIP. Here, we find that phosphorylation of tauC3 at a single residue, pS416, is sufficient to weaken its interaction with CHIP. A co-crystal structure of CHIP bound to the C-terminus of tauC3 reveals the mechanism of this clash, allowing design of a mutation (CHIP) that partially restores binding and turnover of pS416 tauC3. We confirm that, in our models, pS416 is produced by the known AD-associated kinase, MARK2/Par-1b, providing a potential link to disease. In further support of this idea, an antibody against pS416 co-localizes with tauC3 in degenerative neurons within the hippocampus of AD patients. Together, these studies suggest a molecular mechanism for how phosphorylation at a discrete site contributes to accumulation of a tau proteoform.

PubMed: 39266525
DOI: 10.1038/s41467-024-52075-1

Experimental method

X-RAY DIFFRACTION (1.84839139202 Å)