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植物蛋白质组学研究进展 总被引:3,自引:0,他引:3
植物结构蛋白质组学研究目的在不断变化。早期旨在比较不同基因型和株系,估测系统发育距离。随后是用蛋白N端Edman测序法或氨基酸分析法鉴定蛋白。如今,应用双向凝胶电泳和质谱法,已能联手成功地解决蛋白分离和鉴定问题。这将有助于对不同突变系与野生型作比较和对不同的表达基因鉴定,应用数据库和作图软件有可能获得功能蛋白构象。 相似文献
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当前,基于生物质谱进行蛋白质鉴定的技术已经成为蛋白质组学研究的支撑技术之一.产生的数据主要使用数据库搜索的方法进行处理,这种方法的一大缺陷是不能鉴定数据库中未包含的蛋白质,因此如何充分利用质谱数据对蛋白质组研究的意义很大,而新蛋白质鉴定更是其中一个重要的内容.新蛋白质鉴定是蛋白质鉴定的一个方面,新蛋白质的定义按照序列和功能的已知程度分为3个层次;以蛋白质鉴定的方法为基础,目前新蛋白质鉴定的方法可分为denovo测序和相似序列搜索结合的方法以及搜索EST、基因组等核酸数据库的方法2大类;两者各有利弊.存在各自的问题和相应处理的策略.不同的研究者可以根据具体目的应用和发展不同的鉴定方法,同时新蛋白质的鉴定也将随着蛋白质组学研究的发展而更加完善. 相似文献
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为评价蛋白质负染方法在蛋白质组学分析中的应用,采用负染和考马斯亮蓝染色两种方法对同一样品的双向电泳胶进行染色,取相对应的8对蛋白点,并进行胶内酶解及MALDI-TOF/TOF分析,比较两种方法与质谱的兼容性。图像分析显示,负染方法展示出的蛋白点更多,但三维峰图不如考染明晰;质谱结果显示,8个负染蛋白点中有7个鉴定结果有效,8个考染蛋白点鉴定结果均有效。因此可以得出以下结论:负染的灵敏度高于考染,与质谱的兼容性良好,适用于建立双向电泳参考图谱的研究;但负染后的胶图不适于进行蛋白点丰度对比分析。 相似文献
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蛋白质糖基化修饰的鉴定是蛋白质翻译后修饰分析中最具挑战性的任务之一,近几年尤其受到关注.快速发展的质谱技术为规模化的蛋白质糖基化修饰研究提供了有效的手段.与其他基于质谱技术的翻译后修饰鉴定相比,糖基化鉴定的难点在于糖链是大分子而且存在微观不均一性,另外糖链本身可以在串联质谱中碎裂且与肽段的碎裂规律不同,导致蛋白质组学的质谱解析方法和软件难以完整地鉴定肽段序列和糖链结构.完整N-糖肽的鉴定是糖基化分析的热点内容之一,针对N-糖肽的鉴定,近年来,人们开发了多种多样的质谱解析方法,其中包括用N-糖酰胺酶切除糖链后鉴定N-糖基化位点的方法、基于电子转运裂解的糖肽肽段鉴定、基于高能碰撞裂解与电子转运裂解联用或碰撞诱导裂解与三级谱联用的完整N-糖肽鉴定等等.本文对这些质谱解析方法进行了整理和综述,简要指出了目前完整糖肽鉴定软件存在的一些不足,展望了未来的发展方向. 相似文献
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蛋白质糖基化作为最普遍、最重要的蛋白质修饰,一直是组学研究的焦点之一.近十几年来,N-连接糖蛋白质组学研究普遍采用的方法是将糖链与所修饰的多肽分开进行分析.该策略虽降低了分析难度,却也丢失了糖链与蛋白质糖基化位点间重要的对应关系信息.近年来,完整糖肽的质谱分析策略和方法逐步建立起来.总体而言,要实现对完整糖肽的直接质谱分析,首先需要从复杂样品中富集完整糖肽以消除非糖基化多肽对完整糖肽分析的影响,然后在质谱分析中还需要根据糖肽特性调整相应质谱分析参数,最后在后续数据分析中还需要开发相应的分析软件以完成完整糖肽中多肽序列和糖链组成或结构的鉴定.本文即从以上三个主要方面系统阐述目前N-完整糖肽分析中常用的质谱和数据分析策略和方法,并进一步在糖肽谱图识别、母离子单同位素分子质量校正、数据库选择以及假阳性率评估和控制等方面都进行了逐一探讨.完整糖肽的直接质谱分析有助于获取糖链和糖基化位点间的对应关系信息,可为生物标志物发现和疾病致病机理等研究提供更有力的糖蛋白质组学研究工具. 相似文献
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Beer and wine are fermented beverages that contain abundant proteins released from barley or grapes, and secreted from yeast. These proteins are associated with many quality attributes including turbidity, foamability, effervescence, flavour and colour. Many grape proteins and secreted yeast proteins are glycosylated, and barley proteins can be glycated under the high temperatures in the beer making process. The emergence of high-resolution mass spectrometry has allowed proteomic and glycoproteomic analyses of these complex mixtures of proteins towards understanding their role in determining beer and wine attributes. In this review, we summarise recent studies of proteomic and glycoproteomic analyses of beer and wine including their strategies for mass spectrometry (MS)-based identification, quantification and characterisation of the glyco/proteomes of fermented beverages to control product quality. 相似文献
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Identification of N-glycosylated proteins from the central nervous system of Drosophila melanogaster 总被引:1,自引:0,他引:1
Although the function of many glycoproteins in the nervous system of fruit flies is well understood, information about the glycosylation profile and glycan attachment sites for such proteins is scarce. In order to fill this gap and to facilitate the analysis of N-linked glycosylation in the nervous system, we have performed an extensive survey of membrane-associated glycoproteins and their N-glycosylation sites isolated from the adult Drosophila brain. Following subcellular fractionation and trypsin digestion, we used different lectin affinity chromatography steps to isolate N-glycosylated glycopeptides. We identified a total of 205 glycoproteins carrying N-linked glycans and revealed their 307 N-glycan attachment sites. The size of the resulting dataset furthermore allowed the statistical characterization of amino acid distribution around the N-linked glycosylation sites. Glycan profiles were analyzed separately for glycopeptides that were strongly and weakly bound to Concanavalin A (Con A), or that failed to bind Concanavalin A, but did bind to wheat germ agglutinin (WGA). High- or paucimannosidic glycans dominated each of the profiles, although the wheat germ agglutinin-bound glycan population was enriched in more extensively processed structures. A sialylated glycan structure was unambiguously detected in the wheat germ agglutinin-bound fraction. Despite the large amount of starting material, insufficient amount of glycopeptides was retained by the Wisteria floribunda (WFA) and Sambucus nigra columns to allow glycan or glycoprotein identification, providing further evidence that the vast majority of glycoproteins in the adult Drosophila brain carry primarily high-mannose, paucimannose, and hybrid glycans. The obtained results should facilitate future genetic and molecular approaches addressing the role of N-glycosylation in the central nervous system (CNS) of Drosophila. 相似文献
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Miaomiao Xin Shanshan You Yintai Xu Wenhao Shi Bojing Zhu Jiechen Shen Jingyu Wu Cheng Li Zexuan Chen Yuanjie Su Juanzi Shi Shisheng Sun 《Molecular & cellular proteomics : MCP》2022,21(4)
Spermatozoon represents a very special cell type in human body, and glycosylation plays essential roles in its whole life including spermatogenesis, maturation, capacitation, sperm–egg recognition, and fertilization. In this study, by mapping the most comprehensive N-glycoproteome of human spermatozoa using our recently developed site-specific glycoproteomic approaches, we show that spermatozoa contain a number of distinctive glycoproteins, which are mainly involved in spermatogenesis, acrosome reaction and sperm:oocyte membrane binding, and fertilization. Heavy fucosylation is observed on 14 glycoproteins mostly located at extracellular and cell surface regions in spermatozoa but not in other tissues. Sialylation and Lewis epitopes are enriched in the biological process of immune response in spermatozoa, while bisected core structures and LacdiNAc structures are highly expressed in acrosome. These data deepen our knowledge about glycosylation in spermatozoa and lay the foundation for functional study of glycosylation and glycan structures in male infertility. 相似文献
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Takeshi Ara Nozomu Sakurai Hideyuki Suzuki Koh Aoki Kazuki Saito Daisuke Shibata 《Plant Biotechnology》2021,38(1):167
Depository of low-molecular-weight compounds or metabolites detected in various organisms in a non-targeted manner is indispensable for metabolomics research. Due to the diverse chemical compounds, various mass spectrometry (MS) setups with state-of-the-art technologies have been used. Over the past two decades, we have analyzed various biological samples by using gas chromatography-mass spectrometry, liquid chromatography-mass spectrometry, or capillary electrophoresis-mass spectrometry, and archived the datasets in the depository MassBase (http://webs2.kazusa.or.jp/massbase/). As the format of MS datasets depends on the MS setup used, we converted each raw binary dataset of the mass chromatogram to text file format, and thereafter, information of the chromatograph peak was extracted in the text file from the converted file. In total, the depository comprises 46,493 datasets, of which 38,750 belong to the plant species and 7,743 are authentic or mixed chemicals as well as other sources (microorganisms, animals, and foods), as on August 1, 2020. All files in the depository can be downloaded in bulk from the website. Mass chromatograms of 90 plant species obtained by LC-Fourier transform ion cyclotron resonance MS or Orbitrap MS, which detect the ionized molecules with high accuracy allowing speculation of chemical compositions, were converted to text files by the software PowerGet, and the chemical annotation of each peak was added. The processed datasets were deposited in the annotation database KomicMarket2 (http://webs2.kazusa.or.jp/km2/). The archives provide fundamental resources for comparative metabolomics and functional genomics, which may result in deeper understanding of living organisms. 相似文献
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Yuefan Wang Tung-Shing Mamie Lih Naseruddin Höti Lori J. Sokoll Gregory Chesnut Gyorgy Petrovics Indu Kohaar Hui Zhang 《Proteomics》2023,23(7-8):2200023
Urinary glycoproteins associated with aggressive prostate cancer (AG-PCa) were previously reported using post-digital rectal examination (DRE) urine specimens. To explore the potential of using pre-DRE urine specimens for detecting AG-PCa, we compared glycoproteins between pre- and post-DRE urine specimens, verified the previously identified post-DRE AG-PCa-associated urinary glycoproteins in pre-DRE urine specimens, and explored potential new glycoproteins for AG-PCa detection in pre-DRE urine specimens. Quantitative glycoproteomic data were acquired for 154 pre-DRE urine specimens from 41 patients with no cancer at biopsy, 48 patients with non-AG-PCa (Gleason score = 6), and 65 patients with AG-PCa (Gleason score 7 or above). Compared to glycopeptides from the post-DRE urine data, humoral immunity-related proteins were enriched in pre-DRE urine samples, whereas cell mediated immune response proteins were enriched in post-DRE urine samples. Analyses of AG-PCa-associated glycoproteins from pre-DRE urine revealed that the three urinary glycoproteins, prostate-specific antigen (PSA), prostatic acid phosphatase (ACPP), and CD97 antigen (CD97) that were previously identified in post-DRE urine samples, were also observed as AG-PCa associated glycoproteins in pre-DRE urine. In addition, we identified three new glycoproteins, fibrillin 1 (FBN1), vitronectin (VTN), and hemicentin 2 (HMCN2), to be potentially associated with AG-PCa in pre-DRE urine specimens. In summary, glycoprotein profiles differ between pre- and post-DRE urine specimens. The identified AG-PCa-associated glycoproteins may be further evaluated in large cohort of pre-DRE urine specimens for detecting clinically significant PCa. 相似文献
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《Molecular & cellular proteomics : MCP》2020,19(3):529-539
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- •N-glycosylation site analysis of the hemipteran pest insect Nilaparvata lugens.
- •Differential N-glycosylation of proteins is observed between male and female adults.
- •Sex-specific glycoproteins are involved in insect reproduction.