PXD041955

PXD041955 is an original dataset announced via ProteomeXchange.

Title	Extending MS Annika for MS2-MS3-based Cross-linking Workflows
Description	Over the past few decades cross-linking mass spectrometry (XLMS) has become a powerful tool for identification of protein-protein interactions and for gaining insight into the structures of proteins in living cells, tissues, and organelles. The development of new crosslinkers, enrichment strategies and data acquisition methods led to the establishment of numerous new software tools specifically for the analysis and interpretation of cross-linking data. We previously published one of these tools called MS Annika, a cross-linking search engine which can accurately identify cross-linked peptides in MS2 spectra from a variety of different MS-cleavable crosslinkers. In this publication we present an updated MS Annika and a new search algorithm that additionally supports processing of data from MS2-MS3-based approaches and identification of peptides from MS3 spectra. In the new MS2-MS3 search algorithm, MS3 spectra are matched to their corresponding precursor doublet peak in the MS2 scan to identify the crosslink modification and the monoisotopic peptide mass. This information is then used to adjust the MS3 spectra for search with MS Amanda, our in-house developed peptide search engine, to identify the cross-linked peptides. Peptides that are identified in the MS2 scan and one or more of the associated product MS3 scans are re-scored with a novel scoring function to reflect the increased confidence. Finally, the detected cross-links are validated by estimating the false discovery rate (FDR) using a target-decoy approach. We evaluated the MS3-search-capabilities of MS Annika on five different datasets covering a variety of experimental approaches and compared it to XlinkX and MaXLinker, two other cross-linking search engines that support MS3 crosslink identification. Three of the datasets were benchmark datasets of synthetic peptides that allow calculation of an experimentally validated FDR, and we show that MS Annika detects up to 4 times more true unique crosslinks than MaXLinker and up to 35% more than XlinkX while simultaneously yielding less false positive hits and therefore a more accurate FDR than the other two search engines. Additionally, for the other two datasets we could show that MS Annika finds between 74% to 2.5 times more crosslinks at 1% estimated FDR and reveals protein-protein interactions that are not detected by either XlinkX or MaXLinker.
HostingRepository	PRIDE
AnnounceDate	2024-10-22
AnnouncementXML	Submission_2024-10-22_06:00:09.296.xml
DigitalObjectIdentifier	https://dx.doi.org/10.6019/PXD041955
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Supported dataset by repository
PrimarySubmitter	Micha Johannes Birklbauer
SpeciesList	scientific name: Escherichia coli; NCBI TaxID: 562;
ModificationList	monohydroxylated residue; iodoacetamide derivatized residue
Instrument	Orbitrap Eclipse

Revision	Datetime	Status	ChangeLog Entry
0	2023-05-03 11:02:59	ID requested
1	2023-08-13 10:33:16	announced
2	2023-11-14 06:50:28	announced	2023-11-14: Updated project metadata.
⏵ 3	2024-10-22 06:00:09	announced	2024-10-22: Updated project metadata.

10.6019/PXD041955;

10.1021/ACS.JPROTEOME.3C00325;

submitter keyword: search engine, MS3,cross-linking, XLMS, protein-protein-interaction, PPI, crosslinker, XL-MS, bioinformatics, crosslinking

Viktoria Dorfer
contact affiliation	University of Applied Sciences Upper Austria, Bioinformatics Research Group, Softwarepark 11, 4232 Hagenberg, Austria
contact email	viktoria.dorfer@fh-hagenberg.at
lab head
Micha Johannes Birklbauer
contact affiliation	University of Applied Sciences Upper Austria
contact email	micha.birklbauer@fh-hagenberg.at
dataset submitter

Dataset FTP location NOTE: Most web browsers have now discontinued native support for FTP access within the browser window. But you can usually install another FTP app (we recommend FileZilla) and configure your browser to launch the external application when you click on this FTP link. Or otherwise, launch an app that supports FTP (like FileZilla) and use this address: ftp://ftp.pride.ebi.ac.uk/pride/data/archive/2023/08/PXD041955

PRIDE project URI

• PRIDE
  1. PXD041955
     1. Label: PRIDE project
     2. Name: Extending MS Annika for MS2-MS3-based Cross-linking Workflows