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对组织血型基因型和表型各异的人肠道类器官进行的N-糖蛋白质组分析揭示了大量岩藻糖基化糖蛋白。

N-glycoproteomic analyses of human intestinal enteroids, varying in histo-blood group geno- and phenotypes, reveal a wide repertoire of fucosylated glycoproteins.

作者信息

Nilsson Jonas, Rimkute Inga, Sihlbom Carina, Tenge Victoria R, Lin Shih-Ching, Atmar Robert L, Estes Mary K, Larson Göran

机构信息

Department of Laboratory Medicine, Institute of Biomedicine, University of Gothenburg, Sahlgrenska University Hospital, Bruna Stråket 16, SE 413 45, Gothenburg, Sweden.

Department of Clinical Chemistry, Region Västra Götaland, Sahlgrenska University Hospital, Bruna Stråket 16, SE 413 45, Gothenburg, Sweden.

出版信息

Glycobiology. 2024 Apr 24;34(6). doi: 10.1093/glycob/cwae029.

Abstract

Human noroviruses, globally the main cause of viral gastroenteritis, show strain specific affinity for histo-blood group antigens (HBGA) and can successfully be propagated ex vivo in human intestinal enteroids (HIEs). HIEs established from jejunal stem cells of individuals with different ABO, Lewis and secretor geno- and phenotypes, show varying susceptibility to such infections. Using bottom-up glycoproteomic approaches we have defined and compared the N-linked glycans of glycoproteins of seven jejunal HIEs. Membrane proteins were extracted, trypsin digested, and glycopeptides enriched by hydrophilic interaction liquid chromatography and analyzed by nanoLC-MS/MS. The Byonic software was used for glycopeptide identification followed by hands-on verifications and interpretations. Glycan structures and attachment sites were identified from MS2 spectra obtained by higher-energy collision dissociation through analysis of diagnostic saccharide oxonium ions (B-ions), stepwise glycosidic fragmentation of the glycans (Y-ions), and peptide sequence ions (b- and y-ions). Altogether 694 unique glycopeptides from 93 glycoproteins were identified. The N-glycans encompassed pauci- and oligomannose, hybrid- and complex-type structures. Notably, polyfucosylated HBGA-containing glycopeptides of the four glycoproteins tetraspanin-8, carcinoembryonic antigen-related cell adhesion molecule 5, sucrose-isomaltase and aminopeptidase N were especially prominent and were characterized in detail and related to donor ABO, Lewis and secretor types of each HIE. Virtually no sialylated N-glycans were identified for these glycoproteins suggesting that terminal sialylation was infrequent compared to fucosylation and HBGA biosynthesis. This approach gives unique site-specific information on the structural complexity of N-linked glycans of glycoproteins of human HIEs and provides a platform for future studies on the role of host glycoproteins in gastrointestinal infectious diseases.

摘要

人诺如病毒是全球病毒性肠胃炎的主要病因,对组织血型抗原(HBGA)表现出菌株特异性亲和力,并且能够在人肠道类器官(HIE)中成功地进行体外培养。从具有不同ABO、Lewis和分泌型基因及表型个体的空肠干细胞建立的HIE,对这类感染表现出不同的易感性。我们使用自下而上的糖蛋白质组学方法,定义并比较了7种空肠HIE糖蛋白的N-连接聚糖。提取膜蛋白,用胰蛋白酶消化,通过亲水相互作用液相色谱法富集糖肽,并通过纳升液相色谱-串联质谱进行分析。使用Byonic软件进行糖肽鉴定,随后进行人工验证和解释。通过分析诊断性糖鎓离子(B离子)、聚糖的逐步糖苷键断裂(Y离子)和肽序列离子(b和y离子),从通过高能碰撞解离获得的MS2光谱中鉴定聚糖结构和连接位点。总共鉴定出93种糖蛋白中的694种独特糖肽。N-聚糖包括低聚甘露糖和寡聚甘露糖、杂合型和复合型结构。值得注意的是,四种糖蛋白(四跨膜蛋白-8、癌胚抗原相关细胞粘附分子5蔗糖异麦芽糖酶和氨肽酶N)中含多岩藻糖基化HBGA的糖肽尤为突出,并对其进行了详细表征,并与每个HIE的供体ABO、Lewis和分泌型类型相关。实际上,这些糖蛋白几乎没有鉴定出唾液酸化的N-聚糖,这表明与岩藻糖基化和HBGA生物合成相比,末端唾液酸化很少见。这种方法提供了关于人HIE糖蛋白N-连接聚糖结构复杂性的独特位点特异性信息,并为未来研究宿主糖蛋白在胃肠道传染病中的作用提供了一个平台。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1306/11041853/02b20c79af50/cwae029f1.jpg

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