PXD053367-1

PXD053367 is an original dataset announced via ProteomeXchange.

Title	A pilot study for deciphering post-translational modifications and proteoforms of tau protein by capillary electrophoresis-mass spectrometry
Description	Abnormal accumulation of tau proteins is one pathological hallmark of Alzheimer’s disease (AD). Many tau protein post-translational modifications (PTMs) are associated with the development of AD, such as phosphorylation, acetylation, and methylation. Therefore, a complete picture of PTM landscape of tau is critical for understanding the molecular mechanisms of AD progression. Here, we offered a pilot study of combining two complementary analytical techniques, capillary zone electrophoresis (CZE)-tandem mass spectrometry (MS/MS) and reversed-phase liquid chromatography (RPLC)-MS/MS, for bottom-up proteomics of tau-0N3R. We identified 53 phosphorylation sites of tau-0N3R in total, which is about 30% higher than that from RPLC-MS/MS alone. CZE-MS/MS provided more PTM sites (i.e., phosphorylation) and modified peptides of tau-0N3R than RPLC-MS/MS, and its predicted electrophoretic mobility helped improve the confidence of the identified modified peptides. We developed a highly efficient capillary isoelectric focusing (cIEF)-MS technique to offer a bird’s-eye view of tau-0N3R proteoforms, with 11 putative tau-0N3R proteoforms carrying up to ten phosphorylation sites and lower pI values from more phosphorylated proteoforms detected. Interestingly, under a native-like cIEF-MS condition, we observed three putative tau-0N3R dimers carrying phosphate groups. The findings demonstrate that CE-MS is a valuable analytical technique for the characterization of tau PTMs, proteoforms, and even oligomerization.
HostingRepository	PRIDE
AnnounceDate	2024-10-15
AnnouncementXML	Submission_2024-10-15_05:16:56.134.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Liangliang Sun
SpeciesList	scientific name: Escherichia coli; NCBI TaxID: 562;
ModificationList	phosphorylated residue; acetylated residue
Instrument	Q Exactive HF

Revision	Datetime	Status	ChangeLog Entry
0	2024-06-24 10:52:18	ID requested
⏵ 1	2024-10-15 05:16:57	announced

Fang F, Xu T, Chien Hagar HT, Hovde S, Kuo MH, Sun L, Pilot Study for Deciphering Post-Translational Modifications and Proteoforms of Tau Protein by Capillary Electrophoresis-Mass Spectrometry. J Proteome Res, ():(2024) [pubmed]

10.1021/acs.jproteome.4c00587;

submitter keyword: Alzheimer’s disease, capillary electrophoresis-mass spectrometry, post-translational modification,Tau protein, phosphorylation, proteoform

Liangliang Sun
contact affiliation	Department of Chemistry, Michigan State University, 578 S Shaw Lane, East Lansing, MI 48824, United States.
contact email	lsun@chemistry.msu.edu
lab head
Liangliang Sun
contact affiliation	Michigan State University
contact email	lsun@chemistry.msu.edu
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD053367
     1. Label: PRIDE project
     2. Name: A pilot study for deciphering post-translational modifications and proteoforms of tau protein by capillary electrophoresis-mass spectrometry