Dataset Information

Identification of direct cleavages on FVII and FXII by MPro

ABSTRACT: Identification of direct cleavages on FVII and FXII by MPro

INSTRUMENT(S):

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Federico Uliana

LAB HEAD: Federico Uliana

PROVIDER: PXD046242 | Pride | 2025-07-02

REPOSITORIES: Pride

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Dataset's files

Source:

			Action	DRS
	20230926_130439_20230926_apagotto_AP14bis_FVII_1ul_all_PeptideprecursorReport.csv	Csv
	20230926_130439_20230926_apagotto_AP14bis_FVII_1ul_all_PeptideprecursorReport.params	Other
	20230926_133117_20230926_apagotto_AP14bis_FVII_1ul_all.psar	Other
	20230928_apagotto_AP14bis_FXII_1ul_all_F12fastasearchpluscontaminants.psar	Other
	20230929_072741_20230928_apagotto_AP14bis_FXII_all1ul_inj_F12fastasearchpluscontaminants_PeptideprecursorReport.csv	Csv

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Project description:There is an urgent need for robust and high-throughput methods for SARS-CoV-2 detection in suspected pa-tient samples to facilitate disease management, surveillance, and control. Although nucleic acid detection methods such as RT-PCR are the gold standard, during the current pandemic the deployment of RT-PCR tests has been extremely slow, and key reagents such as PCR primers, and RNA extraction kits are at critical shortages. Rapid point-of-care viral antigen detec-tion methods have been previously employed for the diagnosis of respiratory viruses such as influenza and respiratory syn-cytial viruses. Therefore, the direct detection of SARS-CoV-2 viral antigens in patient samples could also be used for diagno-sis of active infection and alternative methodologies for specific and sensitive viral protein detection should be explored. Targeted mass spectrometry techniques have enabled the identification and quantitation of a defined subset of pro-teins/peptides at single amino acid resolution with attomole level sensitivity and high reproducibility. Herein we report a tar-geted mass spectrometry assay for the detection of SARS- CoV-2 spike protein and nucleoprotein in a relevant biologi-cal matrix. Recombinant full-length spike protein and nucleoprotein were digested and prototypic peptides were selected for parallel reaction monitoring (PRM) quantitation using a high resolution Orbitrap instrument. A spectral library, which con-tained 7 proteotypic peptides (4 from spike protein and 3 from nucleoprotein) and the top 3 to 4 transitionsMS2 spectra, was generated and evaluated. From the original spectral library, we selected 2 best performing peptides for the final PRM assay. The assay was evaluated using mock test samples containing inactivated SARS-CoV-2 virions, added to in-vitro de-rived mucus. The PRM assay provided a limit of detection (LOD) of ~200 attomoles and a limit of quantitation (LOQ) of ~ 390 attomoles. Extrapolating from the test samples, the projected titer of virus particles necessary for detection of SARS-CoV-2 spike and nucleoprotein detection was approximately 2E5 viral particles/mL, making it an attractive alternative to RT-PCR assays. Potentially mass spectrometry-based methods for viral antigen detection may deliver higher throughput and could serve as a complementary diagnostic tool to RT-PCR. Furthermore, this assay could be used to evaluate the pres-ence of SARS-CoV-2 in archived or recently collected biological fluids, in-vitro derived research materials, and wastewater samples

Dataset Information

Identification of direct cleavages on FVII and FXII by MPro

Dataset's files

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