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PXD062828

PXD062828 is an original dataset announced via ProteomeXchange.

Dataset Summary
TitleNeutralization mechanism of a HipA-like toxin targeting isoleucyl-tRNA synthetase
DescriptionHipAB is a type II toxin-antitoxin (TA) system that targets and inactivates specific aminoacyl-tRNA synthetases in response to various stresses. While the molecular targets and neutralization mechanisms of several HipAB-like TA systems have been well characterized, their structural and functional diversity remains less understood. In this study, we investigated a HipAB-like module (HipABpf) from Pseudomonas fluorescens, where the HipBpf antitoxin features a long, disordered C-terminal region in the absence of HipApf. Using a combination of X-ray crystallography, AlphaFold modeling and mutagenesis assays, we show that upon binding to HipApf, part of this C-terminal region forms two α-helices that are essential for both the interaction with and neutralization of the HipApf toxin. Importantly, HipBpf binding blocks the ATP binding sites of HipApf, potentially by inducing a conformational change in the HipApf N1 subdomain via its C-terminal α6 helix. We also discovered that HipApf phosphorylates the isoleucyl-tRNA synthetase at Ser604, strongly inhibiting its aminoacylation activity. Finally, we demonstrated that the HipABpf system plays a role in coping with oxidative stress and carbon starvation. Taken together, our findings reveal the critical role of the HipBpf C-terminal region in toxin binding and neutralization, while also highlighting the evolutionarily divergent substrate preferences of HipA-like toxins.
HostingRepositoryiProX
AnnounceDate2025-04-11
AnnouncementXMLSubmission_2025-04-10_20:41:04.076.xml
DigitalObjectIdentifier
ReviewLevelPeer-reviewed dataset
DatasetOriginOriginal dataset
RepositorySupportUnsupported dataset by repository
PrimarySubmitterSiping Zhang
SpeciesList scientific name: Escherichia coli K-12; NCBI TaxID: 83333;
ModificationListphosphorylated residue
InstrumentOrbitrap Fusion Lumos
Dataset History
RevisionDatetimeStatusChangeLog Entry
02025-04-10 20:40:52ID requested
12025-04-10 20:41:04announced
Publication List
Dataset with its publication pending
Keyword List
submitter keyword: HipAB system,Pseudomonas fluorescens,Phosphorylation,Neutralization mechanism
Contact List
Yongxing He
contact affiliationLanzhou University
contact emailheyx@lzu.edu.cn
lab head
Siping Zhang
contact affiliationLanzhou University
contact emailzhangsp2015@lzu.edu.cn
dataset submitter
Full Dataset Link List
iProX dataset URI