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1.
【目的】旨在采用iTRAQ标记结合二维液相色谱串联质谱技术对草菇不同生长发育阶段的差异蛋白质组进行研究。【方法】首先将提取的草菇不同生长阶段蛋白样品进行SDS-PAGE分析,其次将经二维液相色谱串联质谱技术获取的串联质谱数据通过MASCOT软件搜库,之后对鉴定蛋白质数据进行了主成分分析(Principal componentanalysis,PCA)、层次聚类(Hierarchy clustering)分析、K-均值(K-means)聚类和GeneOntology(GO)注释分析。【结果】试验结果显示,共计获得2 335个不同肽段,鉴定到1 039个蛋白质,其中1 030个蛋白质具有定量信息。在子实体阶段中显著上调蛋白质64个,下调蛋白质150个。生物信息学分析表明,iTRAQ标记技术结合二维液相色谱串联质谱可对不同生长发育时期的草菇蛋白样品进行有效地分离和鉴定。【结论】这一研究结果为深入研究草菇乃至其他大型担子菌子实体形成和发育的分子机制提供借鉴。  相似文献   

2.
为鉴定不同抗性苹果(Malusdomestica)品种响应轮纹病菌胁迫的抗性相关蛋白表达差异,以抗病品种华月及易感品种金冠为试材,采用高通量同位素标记定量(IBT)技术结合液相色谱-串联质谱(LC-MS)鉴定技术,对病原菌处理前后抗、感病品种叶片的蛋白质组差异表达进行分析,共鉴定出171个差异表达蛋白(DEPs)。GO富集及KEGG通路分析表明,在细胞组分、分子功能和生物过程3类中共注释到686个GO条目,其中52个DEPs注释于KEGG通路的18个显著差异途径(P0.05)。亚细胞定位预测分析表明, 171个DEPs中有170个分别定位于8类细胞器。蛋白功能注释分析表明, 46个DEPs注释于7类抗性相关蛋白,包括类甜蛋白、过氧化物酶、多酚氧化酶、过敏原蛋白、几丁质酶、内切葡聚糖酶以及主乳胶蛋白。此外,还对抗性相关蛋白的表达特点及基因定量结果进行了分析。该研究结果可为进一步解析抗、感病苹果品种应答轮纹病菌胁迫的抗性机制提供参考。  相似文献   

3.
李伟 《生命的化学》2006,26(5):453-456
研究不同生理和病理条件下细胞内蛋白质的含量和状态变化是比较蛋白质组学的核心内容。要揭示上述动态过程往往需要进行多个样品的同步比较分析。近年来,在体内和体外同位素标记基础上,用多维液相色谱分离多肽,进而用串联质谱进行相对定量的分析方法已成为高通量比较蛋白质组研究的主要手段之一。该文就目前唯一一种可以进行四重蛋白质样品同步比较的iTRAQ标记-串联质谱分析技术进行综述。  相似文献   

4.
本试验利用TMT标记并结合二维高效液相色谱/串联质谱联用的研究策略对水牛卵母细胞成熟前后差异蛋白质组进行分析。试验首先收集水牛成熟前卵母细胞和成熟后卵母细胞,分别提取卵母细胞这两个时期的蛋白质,酶解蛋白后进行TMT标记,其中TMT-126标记成熟后的肽段,TMT-129标记成熟前的肽段,标记后采用强阳离子交换柱对酶解得到的肽段进行分离,接着进行nano LC分离,质谱分析采用在线连接电喷雾串联Orbitrap的方法,最后使用SEQUEST软件进行数据库搜索,采用生物信息学方法对鉴定得到的差异蛋白质进行初步分析。根据定量差异倍数≥2即认为蛋白表达存在差异,鉴定出卵母细胞成熟前高表达的蛋白有18种,成熟后高表达的蛋白有26种。对这些差异蛋白进行生物信息学分析表明,利用TMT标记并结合二维高效液相色谱/串联质谱联用的研究策略可以有效地分离和鉴定水牛卵母细胞成熟前后的蛋白质。本试验发现可能与水牛卵母细胞成熟相关的标志性蛋白:调控细胞凋亡蛋白(BCL2L10)、胎球蛋白(AHSG)、伴侣蛋白(Erp29),这可能为今后研究水牛卵母细胞成熟前后的蛋白质表达变化规律提供了试验依据。  相似文献   

5.
对小鼠睾丸中未分化(Undifferentiated)和分化中(Differentiating)的两类精原细胞进行定量蛋白质组研究,探讨两类精原细胞蛋白质组的表达差异,探索与精原细胞分化相关的蛋白质。利用Thy1和c-Kit两个特异抗体结合的磁珠分选技术,分别将生后7 d雄性小鼠睾丸中的Thy1+细胞和c-Kit+细胞分别作为未分化和分化中的精原细胞分选出来,其中Thy1阳性细胞3组,c-Kit阳性细胞4组,分别代表了未分化精原细胞和分化中的精原细胞。采用高效液相色谱串联质谱方法(LC-MS/MS)分析两类细胞蛋白表达差异。并且对两类细胞的差异蛋白进行基因本体(Gene ontology,GO)功能注释、KEGG代谢通路和聚类分析。质谱分析共鉴定了3228种蛋白,其中有256种蛋白在两类细胞中表达差异。其中,差异蛋白的富集分析发现,在生物过程方面,注释结果显示差异蛋白主要在代谢过程(Primary metabolic process),细胞代谢过程(Cellular metabolic process),分子代谢过程(Macromolecule metabolic process)和氮化合物代谢过程(Nitrogen compound metabolic process)中富集;在细胞组分方面,蛋白主要富集在细胞(Cell part)、细胞内组分(Intracellular part)和细胞器(Intracellular organelle)中;在分子功能方面,鉴定到的蛋白主要参与蛋白结合(Protein binding)、核苷结合(Nucleotide binding)、水解酶活性(Hydrolase activity)和核酸结合过程(Nucleic acid binding)。基因组百科全书(Kyoto encyclopedia of genes and genomes,KEGG)通路注释结果显示:88个蛋白质在KEGG通路分析数据库中有功能注释,共参与了18条代谢通路,其中,最主要的代谢通路是剪接体(Spliceosome)和泛素介导的蛋白水解作用(Ubiquitin mediated proteolysis)。获得小鼠睾丸中未分化和分化中的两类精原细胞蛋白质组表达谱,揭示精原细胞分化的蛋白质组的组成、筛选出差异蛋白。  相似文献   

6.
为鉴定不同抗性苹果(Malus domestica)品种响应轮纹病菌胁迫的抗性相关蛋白表达差异, 以抗病品种华月及易感品种金冠为试材, 采用高通量同位素标记定量(IBT)技术结合液相色谱-串联质谱(LC-MS)鉴定技术, 对病原菌处理前后抗、感病品种叶片的蛋白质组差异表达进行分析, 共鉴定出171个差异表达蛋白(DEPs)。GO富集及KEGG通路分析表明, 在细胞组分、分子功能和生物过程3类中共注释到686个GO条目, 其中52个DEPs注释于KEGG通路的18个显著差异途径(P<0.05)。亚细胞定位预测分析表明, 171个DEPs中有170个分别定位于8类细胞器。蛋白功能注释分析表明, 46个DEPs注释于7类抗性相关蛋白, 包括类甜蛋白、过氧化物酶、多酚氧化酶、过敏原蛋白、几丁质酶、内切葡聚糖酶以及主乳胶蛋白。此外, 还对抗性相关蛋白的表达特点及基因定量结果进行了分析。该研究结果可为进一步解析抗、感病苹果品种应答轮纹病菌胁迫的抗性机制提供参考。  相似文献   

7.
iTRAQ技术是一种新的、功能强大的、可以最多同时比较8种不同样品中蛋白质相对或绝对含量的蛋白质组学方法,结合多维液相色谱和串联质谱分析,iTRAQ技术已成为差异蛋白质组学定量研究的主要工具之一。而真菌的致病作用是多种蛋白质共同参与的真菌?宿主相互作用的复杂过程,因此整体、定量地分析真菌致病过程中的差异表达蛋白质谱,对于研究真菌的致病机制具有重要作用。该文重点就iTRAQ技术在真菌研究中的应用进展进行综述。  相似文献   

8.
应用毛细管液相色谱 电喷雾 四极杆 飞行时间串联质谱和纳升电喷雾 四极杆 飞行时间串联质谱技术 ,对阻断白血病细胞泛素通路诱发的凋亡相关蛋白质进行了鉴定。通过双向电泳发现 ,蛋白质斑点H在阻断Mo7e白血病细胞泛素通路 2h之后 ,表达量明显增加 ,6h达到最高。该斑点经MALDI TOF MS肽质量指纹谱分析未获结果 ,但通过上述 2种串联质谱技术获得其胰蛋白酶水解肽段的串联质谱图和肽段的全长序列 ,经检索均确认为RhoGDIβ蛋白。进一步发现阻断泛素通路还诱发了另 2个斑点出现 ,位于H点附近 ,经鉴定为同一蛋白质 ,可能是不同翻译后修饰所造成  相似文献   

9.
《菌物学报》2015,(6):1153-1164
为探讨双孢蘑菇子实体发育不同阶段的蛋白质表达变化,对双孢蘑菇As2796菌株子实体原基期、幼菇期、采收期、开伞期的蛋白质组进行了二维液相色谱串联质谱(i TRAQ-MS/MS)分析,共获得不同肽段5 869个,鉴定到1 059个蛋白质,其中1 007个具有相对定量信息。与双孢蘑菇原基期相比,幼菇期、采收期和开伞期分别有差异蛋白质242、200、240个,分别占鉴定蛋白质总数的24.0%,19.9%和23.8%。对这些蛋白质及不同阶段之间的差异蛋白质进行了系列生物信息学分析,对8个上、下调表达具有连续性的差异蛋白质相关基因进行了荧光定量PCR验证,其中3个蛋白质(错配碱基识别蛋白、细胞色素C1及某推定的未知蛋白质)基因的转录与蛋白质的表达具有较为一致的趋势。这些结果为后续双孢蘑菇子实体发育相关基因的功能研究奠定了良好的基础。  相似文献   

10.
应用同位素标记相对和绝对定量(iTRAQ)技术筛选多浪羊(Dolang sheep)发情期、发情间期和妊娠期差异表达蛋白质,为发情调控与鉴定、早期妊娠诊断等研究提供基础.通过iTRAQ并结合液相色谱串联质谱(LC-MS/MS)技术,鉴定出4845个蛋白,其中显著差异蛋白470个.与发情间期相比,发情期上调蛋白18个,下调蛋白102个,妊娠期上调蛋白20个,下调蛋白60个;与发情期相比,妊娠期上调蛋白50个,下调蛋白24个;上调蛋白中有 cyclin-Y isoform X1,cleavages timulation factor subunit 1 isoform X1,follistatin-related protein 1 isoform X2,nicotinate phosphoribosyltransferase isoform X1,下调蛋白中 hemopexin isoform X1,apolipoprotein A-Ⅱ,nucleophosmin等蛋白与激素生成、发情调控、合子的产生与凋亡、早期胚胎附植及胚胎发育等功能有关,其中相对于发情期和发情间情期,cyclin-Y isoform X1和nicotinate phosphoribosyltrans-ferase isoform X1在妊娠期显著上调.试验通过iTRAQ蛋白质组学技术鉴定出的多浪羊发情及妊娠相关的差异蛋白质,为进一步探索绵羊发情鉴定和早期妊娠诊断候选生物标志物提供了新的思路和方法.  相似文献   

11.
We have developed a proteomics technology featuring on-line three-dimensional liquid chromatography coupled to tandem mass spectrometry (3D LC-MS/MS). Using 3D LC-MS/MS, the yeast-soluble, urea-solubilized peripheral membrane and SDS-solubilized membrane protein samples collectively yielded 3019 unique yeast protein identifications with an average of 5.5 peptides per protein from the 6300-gene Saccharomyces Genome Database searched with SEQUEST. A single run of the urea-solubilized sample yielded 2255 unique protein identifications, suggesting high peak capacity and resolving power of 3D LC-MS/MS. After precipitation of SDS from the digested membrane protein sample, 3D LC-MS/MS allowed the analysis of membrane proteins. Among 1221 proteins containing two or more predicted transmembrane domains, 495 such proteins were identified. The improved yeast proteome data allowed the mapping of many metabolic pathways and functional categories. The 3D LC-MS/MS technology provides a suitable tool for global proteome discovery.  相似文献   

12.
To establish a proteomic reference map for soybean leaves, we separated and identified leaf proteins using two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) and mass spectrometry (MS). Tryptic digests of 260 spots were subjected to peptide mass fingerprinting (PMF) by matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) MS. Fifty-three of these protein spots were identified by searching NCBInr and SwissProt databases using the Mascot search engine. Sixty-seven spots that were not identified by MALDI-TOF-MS analysis were analyzed with liquid chromatography tandem mass spectrometry (LC-MS/MS), and 66 of these spots were identified by searching against the NCBInr, SwissProt and expressed sequence tag (EST) databases. We have identified a total of 71 unique proteins. The majority of the identified leaf proteins are involved in energy metabolism. The results indicate that 2D-PAGE, combined with MALDI-TOF-MS and LC-MS/MS, is a sensitive and powerful technique for separation and identification of soybean leaf proteins. A summary of the identified proteins and their putative functions is discussed.  相似文献   

13.
The proper development of the mammalian cerebral cortex requires precise protein synthesis and accurate regulation of protein expression levels. To reveal signatures of protein expression in developing mouse cortices, we here generate proteomic profiles of cortices at embryonic and postnatal stages using tandem mass spectrometry (MS/MS). We found that protein expression profiles are mostly consistent with biological features of the developing cortex. Gene Ontology (GO) and KEGG pathway analyses demonstrate conserved molecules that maintain cortical development such as proteins involved in metabolism. GO and KEGG pathway analyses further identify differentially expressed proteins that function at specific stages, for example proteins regulating the cell cycle in the embryonic cortex, and proteins controlling axon guidance in the postnatal cortex, suggesting that distinct protein expression profiles determine biological events in the developing cortex. Furthermore, the STRING network analysis has revealed that many proteins control a single biological event, such as the cell cycle regulation, through cohesive interactions, indicating a complex network regulation in the cortex. Our study has identified protein networks that control the cortical development and has provided a protein reference for further investigation of protein interactions in the cortex.  相似文献   

14.
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) and multiple reaction monitoring mass spectrometry (MRM-MS) proteomics analyses were performed on eccrine sweat of healthy controls, and the results were compared with those from individuals diagnosed with schizophrenia (SZ). This is the first large scale study of the sweat proteome. First, we performed LC-MS/MS on pooled SZ samples and pooled control samples for global proteomics analysis. Results revealed a high abundance of diverse proteins and peptides in eccrine sweat. Most of the proteins identified from sweat samples were found to be different than the most abundant proteins from serum, which indicates that eccrine sweat is not simply a plasma transudate and may thereby be a source of unique disease-associated biomolecules. A second independent set of patient and control sweat samples were analyzed by LC-MS/MS and spectral counting to determine qualitative protein differential abundances between the control and disease groups. Differential abundances of selected proteins, initially determined by spectral counting, were verified by MRM-MS analyses. Seventeen proteins showed a differential abundance of approximately 2-fold or greater between the SZ pooled sample and the control pooled sample. This study demonstrates the utility of LC-MS/MS and MRM-MS as a viable strategy for the discovery and verification of potential sweat protein disease biomarkers.  相似文献   

15.
Proteome profiling of human epithelial ovarian cancer cell line TOV-112D   总被引:3,自引:0,他引:3  
A proteome profiling of the epithelial ovarian cancer cell line TOV-112D was initiated as a protein expression reference in the study of ovarian cancer. Two complementary proteomic approaches were used in order to maximise protein identification: two-dimensional gel electrophoresis (2DE) protein separation coupled to matrix assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS) and one-dimensional gel electrophoresis (1DE) coupled to liquid-chromatography tandem mass spectrometry (LC MS/MS). One hundred and seventy-two proteins have been identified among 288 spots selected on two-dimensional gels and a total of 579 proteins were identified with the 1DE LC MS/MS approach. This proteome profiling covers a wide range of protein expression and identifies several proteins known for their oncogenic properties. Bioinformatics tools were used to mine databases in order to determine whether the identified proteins have previously been implicated in pathways associated with carcinogenesis or cell proliferation. Indeed, several of the proteins have been reported to be specific ovarian cancer markers while others are common to many tumorigenic tissues or proliferating cells. The diversity of proteins found and their association with known oncogenic pathways validate this proteomic approach. The proteome 2D map of the TOV-112D cell line will provide a valuable resource in studies on differential protein expression of human ovarian carcinomas while the 1DE LC MS/MS approach gives a picture of the actual protein profile of the TOV-112D cell line. This work represents one of the most complete ovarian protein expression analysis reports to date and the first comparative study of gene expression profiling and proteomic patterns in ovarian cancer.  相似文献   

16.
The formation and development of maize kernel is a complex dynamic physiological and biochemical process that involves the temporal and spatial expression of many proteins and the regulation of metabolic pathways. In this study, the protein profiles of the endosperm and pericarp at three important developmental stages were analyzed by isobaric tags for relative and absolute quantification (iTRAQ) labeling coupled with LC-MS/MS in popcorn inbred N04. Comparative quantitative proteomic analyses among developmental stages and between tissues were performed, and the protein networks were integrated. A total of 6,876 proteins were identified, of which 1,396 were nonredundant. Specific proteins and different expression patterns were observed across developmental stages and tissues. The functional annotation of the identified proteins revealed the importance of metabolic and cellular processes, and binding and catalytic activities for the development of the tissues. The whole, endosperm-specific and pericarp-specific protein networks integrated 125, 9 and 77 proteins, respectively, which were involved in 54 KEGG pathways and reflected their complex metabolic interactions. Confirmation for the iTRAQ endosperm proteins by two-dimensional gel electrophoresis showed that 44.44% proteins were commonly found. However, the concordance between mRNA level and the protein abundance varied across different proteins, stages, tissues and inbred lines, according to the gene cloning and expression analyses of four relevant proteins with important functions and different expression levels. But the result by western blot showed their same expression tendency for the four proteins as by iTRAQ. These results could provide new insights into the developmental mechanisms of endosperm and pericarp, and grain formation in maize.  相似文献   

17.
靳换  李逸  姜楠  周磊  盖新娜  杨汉春  郭鑫 《微生物学通报》2017,44(12):2856-2870
【目的】研究猪繁殖与呼吸综合征病毒(Porcine reproductive and respiratory syndrome virus,PRRSV)nsp11与宿主细胞蛋白之间的相互作用,对于揭示nsp11在病毒复制过程中发挥的功能至关重要。【方法】在病毒感染细胞的基础上,利用nsp11的单克隆抗体,采用免疫沉淀结合串联质谱的方法,筛选与PRRSV nsp11相互作用的宿主细胞蛋白,并对所筛选出的宿主细胞蛋白进行了GO注释、COG注释和KEGG代谢通路注释;选取筛选出的宿主细胞蛋白IRAK1,利用免疫共沉淀技术和激光共聚焦技术鉴定其与nsp11之间的相互作用。【结果】与空白对照组相比,病毒感染组中出现3条差异带;经质谱分析共筛选得到了201个与nsp11相互作用的宿主细胞蛋白,分别与蛋白质代谢、细胞信号通路转导以及病原致病性等密切相关;在生物信息学分析的基础上,实验验证了nsp11确与宿主细胞蛋白IRAK1进行相互作用。【结论】鉴定出与PRRSV nsp11相互作用的宿主细胞蛋白,生物信息学分析显示它们在病毒的复制和致病过程中发挥重要作用。研究结果为探究nsp11的生物学功能指明了方向,也为研究宿主细胞蛋白与病毒蛋白间的相互作用及其调控病毒复制和致病性的分子机制奠定了基础。  相似文献   

18.
The possibility of the brine shrimp Artemia to produce dormant embryo (cysts) in diapause is a key feature in its life history. In the present study, we obtained a proteomic reference map for the diapause embryo of Artemia sinica using two-dimensional gel electrophoresis with a pH range of 4-7 and a molecular weight range of 10-100 kDa. Approximately 233 proteins were detected, and 60 of them were analyzed by capillary liquid chromatography tandem mass spectrometry (LC-MS/MS). Of these, 39 spots representing 33 unique proteins were identified, which are categorized into functional groups, including cell defense, cell structure, metabolism, protein synthesis, proteolysis, and other processes. This reference map will contribute toward understanding the state of the diapause embryo and lay the basis and serve as a useful tool for further profound studies in the proteomics of Artemia at different developmental stages and physiological conditions.  相似文献   

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