Dataset Information

Precision structural interpretation of site-specific N-glycans in seminal plasma

ABSTRACT: This study is aimed to comprehensively and globally characterize seminal plasma glycoproteins in a site-specific manner with information of N-glycosites and corresponding glycan structures, as well as glycan isomers using mass spectrometry. Furthermore, the function of specific glycan structures is introduced during human reproduction. In addition, site-specific glycoproteins are compared precisely to explored the sub-glycan structure regulation of glycoprotein in human seminal plasma and spermatozoa.

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Testis, Sperm

SUBMITTER: Miaomiao Xin

LAB HEAD: Shisheng Sun

PROVIDER: PXD030804 | Pride | 2023-03-04

REPOSITORIES: Pride

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Source:

			Action	DRS
	checksum.txt	Txt
	sp_cotton_fraction10_IGP1_xin_20210101.raw	Raw
	sp_cotton_fraction10_IGP1_xin_20210101_result.xlsx	Xlsx
	sp_cotton_fraction10_IGP2_xin_20210101.raw	Raw
	sp_cotton_fraction10_IGP2_xin_20210101_result.xlsx	Xlsx

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Project description:STT3A and STT3B are the main catalytic subunit of oligosaccharyltransferase (OST-A and OST-B in mammalian cells), which primarily mediate cotranslational and posttranslocational N-linked glycosylation, respectively. To determine the specificity of STT3A and STT3B, we performed proteomics and glycoproteomics analyses to characterize the protein expression and glycosylation in STT3A-knockout (KO), STT3B-KO, and wild-type (WT) HEK293 cells. In total, 3,993 proteins, 4,020 unique N-linked intact glycopeptides (IGPs) and 723 glycosites, representing 401 glycoproteins were identified in KO and WT cells. Deletion of the STT3A gene had a greater impact on the protein expression than deletion of STT3B, especially on glycoproteins. In addition, mannosylated N-glycans from glycoproteins were reduced, while fucosylated N-glycans were increased in STT3A-KO cells. The glycan changes may be caused by the differential expression of glycosyltransferases and the activation of unfolded protein response (UPR) with further analysis of glycan-related enzymes. Interestingly, hyperglycosylated proteins were identified in KO cells. We verified that the hyperglycosylation of ENPL was caused by the ER stress and UPR, which were induced by the deletion of the STT3A. Overall, the specificity of STT3A and STT3B revealed that defects in the OST subunit not only broadly affect N-linked glycosylation of the protein but also affect protein expression.STT3A and STT3B are the main catalytic subunit of oligosaccharyltransferase (OST-A and OST-B in mammalian cells), which primarily mediate cotranslational and posttranslocational N-linked glycosylation, respectively. To determine the specificity of STT3A and STT3B, we performed proteomics and glycoproteomics analyses to characterize the protein expression and glycosylation in STT3A-knockout (KO), STT3B-KO, and wild-type (WT) HEK293 cells. In total, 3,993 proteins, 4,020 unique N-linked intact glycopeptides (IGPs) and 723 glycosites, representing 401 glycoproteins were identified in KO and WT cells. Deletion of the STT3A gene had a greater impact on the protein expression than deletion of STT3B, especially on glycoproteins. In addition, mannosylated N-glycans from glycoproteins were reduced, while fucosylated N-glycans were increased in STT3A-KO cells. The glycan changes may be caused by the differential expression of glycosyltransferases and the activation of unfolded protein response (UPR) with further analysis of glycan-related enzymes. Interestingly, hyperglycosylated proteins were identified in KO cells. We verified that the hyperglycosylation of ENPL was caused by the ER stress and UPR, which were induced by the deletion of the STT3A. Overall, the specificity of STT3A and STT3B revealed that defects in the OST subunit not only broadly affect N-linked glycosylation of the protein but also affect protein expression.

Dataset Information

Precision structural interpretation of site-specific N-glycans in seminal plasma

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