7RLB

Cryo-EM structure of human p97-A232E mutant bound to ADP

Summary for 7RLB

• Entry DOI: 10.2210/pdb7rlb/pdb
• EMDB information: 24524
• Descriptor: Transitional endoplasmic reticulum ATPase, ADENOSINE-5'-DIPHOSPHATE (2 entities in total)
• Functional Keywords: p97, vcp, tera, inhibitor, cb-5083, hydrolase
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 6
• Total formula weight: 552864.49

Authors

Caffrey, B.,Zhu, X.,Berezuk, A.,Tuttle, K.,Chittori, S.,Subramaniam, S. (deposition date: 2021-07-23, release date: 2021-09-22, Last modification date: 2024-06-05)

Primary citation

Caffrey, B.,Zhu, X.,Berezuk, A.,Tuttle, K.,Chittori, S.,Subramaniam, S.
AAA+ ATPase p97/VCP mutants and inhibitor binding disrupt inter-domain coupling and subsequent allosteric activation.
J.Biol.Chem., 297:101187-101187, 2021

PubMed Abstract: The human AAA+ ATPase p97, also known as valosin-containing protein, a potential target for cancer therapeutics, plays a vital role in the clearing of misfolded proteins. p97 dysfunction is also known to play a crucial role in several neurodegenerative disorders, such as MultiSystem Proteinopathy 1 (MSP-1) and Familial Amyotrophic Lateral Sclerosis (ALS). However, the structural basis of its role in such diseases remains elusive. Here, we present cryo-EM structural analyses of four disease mutants p97, p97, p97, p97, as well as p97, implicated in resistance to the drug CB-5083, a potent p97 inhibitor. Our cryo-EM structures demonstrate that these mutations affect nucleotide-driven allosteric activation across the three principal p97 domains (N, D1, and D2) by predominantly interfering with either (1) the coupling between the D1 and N-terminal domains (p97 and p97), (2) the interprotomer interactions (p97), or (3) the coupling between D1 and D2 nucleotide domains (p97, p97). We also show that binding of the competitive inhibitor, CB-5083, to the D2 domain prevents conformational changes similar to those seen for mutations that affect coupling between the D1 and D2 domains. Our studies enable tracing of the path of allosteric activation across p97 and establish a common mechanistic link between active site inhibition and defects in allosteric activation by disease-causing mutations and have potential implications for the design of novel allosteric compounds that can modulate p97 function.

PubMed: 34520757
DOI: 10.1016/j.jbc.2021.101187

Experimental method

ELECTRON MICROSCOPY (3.3 Å)