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排序方式: 共有297条查询结果,搜索用时 15 毫秒
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Panagiotis Stathopoulos Serafim Papas Marianna Sakka Andreas G. Tzakos Vassilios Tsikaris 《Amino acids》2014,46(5):1367-1376
Selective removal of protecting groups under different cleavage mechanisms could be an asset in peptide synthesis, since it provides the feasibility to incorporate different functional groups in similar reactive centres. However, selective protection/deprotection of orthogonal protecting groups in peptides is still challenging, especially for Cys-containing peptides, where protection of the cysteine side-chain is mandatory since the nucleophilic thiol can be otherwise alkylated, acylated or oxidized. Herein, we established a protocol for the synthesis of Cys-selective S-Trt or S-Mmt protected Cys-containing peptides, in a rapid way. This was achieved by, simply fine-tuning the carbocation scavenger in the final acidolytic release of the peptide from the solid support in the classic SPPS. 相似文献
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Sandalakis V Psaroulaki A De Bock PJ Christidou A Gevaert K Tsiotis G Tselentis Y 《Journal of proteome research》2012,11(4):2374-2385
Mutations in the rpoB gene have already been shown to contribute to rifampicin resistance in many bacterial strains including Brucella species. Resistance against this antibiotic easily occurs and resistant strains have already been detected in human samples. We here present the first research project that combines proteomic, genomic, and microbiological analysis to investigate rifampicin resistance in an in vitro developed rifampicin resistant strain of Brucella abortus 2308. In silico analysis of the rpoB gene was performed and several antibiotics used in the therapy of Brucellosis were used for cross resistance testing. The proteomic profiles were examined and compared using MS-driven comparative proteomics. The resistant strain contained an already described mutation in the rpoB gene, V154F. A correlation between rifampicin resistance and reduced susceptibility on trimethoprim/sulfamethoxazole was detected by E-test and supported by the proteomics results. Using 12?836 MS/MS spectra we identified 6753 peptides corresponding to 456 proteins. The resistant strain presented 39 differentially regulated proteins most of which are involved in various metabolic pathways. Results from our research suggest that rifampicin resistance in Brucella mostly involves mutations in the rpoB gene, excitation of several metabolic processes, and perhaps the use of the already existing secretion mechanisms at a more efficient level. 相似文献
66.
Angelica Dessì Chiara Pravettoni Flaminia Cesare Marincola Andrea Schirru Vassilios Fanos 《Expert review of proteomics》2015,12(3):309-316
Adipose tissue is no longer considered as inert; the literature describes the role it plays in the production of many substances, such as adiponectin, visfatin, ghrelin, S100B, apelin, TNF, IL-6 and leptin. These molecules have specific roles in humans and their potential as biomarkers useful for identifying alterations related to intrauterine growth retardation and large for gestational age neonates is emerging. Infants born in such conditions have undergone metabolic changes, such as fetal hypo- or hyperinsulinemia, which may lead to development of dysmetabolic syndrome and other chronic diseases in adulthood. In this review, these biomarkers are analyzed specifically and it is discussed how metabolomics may be an advantageous tool for detection, discrimination and prediction of metabolic alterations and diseases. Thus, a holistic approach, such as metabolomics, could help the prevention and early diagnosis of metabolic syndrome. 相似文献
67.
Vassilios Tsikaris Marie-Christine Petit Piotr Orlewski Maria Sakarellos-Daitsiotis Constantinos Sakarellos Athina Tzinia Georgia Konidou Ketty P. Soteriadou Michel Marraud Manh Thong Cung 《Letters in Peptide Science》1997,4(4-6):323-330
The I250ASRYDQL257 synthetic octapeptideof the Leishmania major surface glycoproteingp63, which efficiently inhibits parasite attachmentto the macrophage receptors and mimics antigenicallyand functionally the RGDS sequence of fibronectin, wasstudied by 2D TR-NOESY in the presence of an anti-SRYDmonoclonal antibody (mAbSRYD) that recognizes bothSRYD-containing peptides and the cognate protein onintact parasites. Molecular modeling was performedusing distance constraints obtained from TR-NOEs. Thebound structure was compared with that of the freepeptide in DMSO solution and with the crystalstructure of the RYD fragment of the OPG2 Fab, anantireceptor antibody that mimics an RGD cell adhesion site. 相似文献
68.
Constantinos Sakarellos Vassilios Tsikaris Eugenia Panou-Pomonis Charalampos Alexopoulos Maria Sakarellos-Daitsiotis Constantinos Petrovas Panayiotis G. Vlachoyiannopoulos Haralampos M. Moutsopoulos 《Letters in Peptide Science》1997,4(4-6):447-454
The PPGMRPP sequence, found in several copies in the Sm and U1RNPautoantigens, is the main target of anti-Sm and anti-U1RNP antibodies insystemic lupus erythematosus (SLE) and mixed connective tissue disease(MCTD) patient's sera. It is also recognized, to a lower extent, byanti-Ro/SSA and anti-La/SSB specificities. The PPGMRPP-NH2peptide amide and the PPGMRPP peptide, which is bound to a pentamericsequential oligopeptide carrier (SOC5), were examined by1H-NMR spectroscopy and ELISA assays, using sera from patientswith autoimmune rheumatic diseases. Among the three main conformers foundfor the free PPGMRPP, the extended one was also identified for PPGMRPP-NH2 and (PPGMRPP)5-SOC5.This can be attributed to the absence of ionic interactions between theArg-guanidinium and the carboxylate group in the amide andSOC5-bound forms of the peptide. Immunoassays using sera fromvarious specificities showed an enhanced anti-Sm and anti-U1RNP recognitionof PPGMRPP-NH2 and(PPGMRPP)5-SOC5, and lowering of the anti-Ro/SSAand anti-La/SSB reactivity. The presence of multiple conformers of freePPGMRPP may explain the unexpected cross-reactivity to the anti-Ro/Lapositive sera, while the prevalence of the extended conformation inPPGMRPP-NH2 and (PPGMRPP)5-SOC5is mainly responsible for the enhanced recognition from the anti-Sm andanti-U1RNP autoantibodies. It is concluded that the antigenic specificity ofPPGMRPP-NH2 and (PPGMRPP)5-SOC5 ismainly induced by conformational changes resulting from the conversion ofthe C-terminal carboxylate group to the amide form. 相似文献
69.
Leeyah Issop Mariano A. Ostuni Sunghoon Lee Mireille Laforge Gabriel Péranzi Pierre Rustin Jean-Fran?ois Benoist Jérome Estaquier Vassilios Papadopoulos Jean-Jacques Lacapère 《PloS one》2016,11(4)
Chronic inflammation of the gastrointestinal tract increasing the risk of cancer has been described to be linked to the high expression of the mitochondrial translocator protein (18 kDa; TSPO). Accordingly, TSPO drug ligands have been shown to regulate cytokine production and to improve tissue reconstruction. We used HT-29 human colon carcinoma cells to evaluate the role of TSPO and its drug ligands in tumor necrosis factor (TNF)-induced inflammation. TNF-induced interleukin (IL)-8 expression, coupled to reactive oxygen species (ROS) production, was followed by TSPO overexpression. TNF also destabilized mitochondrial ultrastructure, inducing cell death by apoptosis. Treatment with the TSPO drug ligand PK 11195 maintained the mitochondrial ultrastructure, reducing IL-8 and ROS production and cell death. TSPO silencing and overexpression studies demonstrated that the presence of TSPO is essential to control IL-8 and ROS production, so as to maintain mitochondrial ultrastructure and to prevent cell death. Taken together, our data indicate that inflammation results in the disruption of mitochondrial complexes containing TSPO, leading to cell death and epithelia disruption. Significance: This work implicates TSPO in the maintenance of mitochondrial membrane integrity and in the control of mitochondrial ROS production, ultimately favoring tissue regeneration. 相似文献
70.
The demands of stair descent relative to maximum capacities in elderly and young adults. 总被引:3,自引:0,他引:3
N D Reeves M Spanjaard A A Mohagheghi V Baltzopoulos C N Maganaris 《Journal of electromyography and kinesiology》2008,18(2):218-227
In this study, we aimed to establish the joint moment and joint range of motion requirements of stair descent and the demands relative to maximal capacities in elderly and young adults. Participants descended a custom-built standard dimension four-step staircase, at their self-selected speed in a step-over manner. Kinetic data were acquired from force platforms embedded into each of the steps and into the floor at the base of the stairs. A motion analysis system was used to acquire kinematic data and joint moments were calculated using the kinematic and kinetic data. Maximum capacities (joint moment and joint range of motion) were assessed using a dynamometer. During stair descent the elderly generated lower absolute ankle joint moments than the young, which enabled them to operate at a similar relative proportion of their maximal capacity compared to young adults (75%). The knee joint moments during stair descent were similar between groups, but the elderly operated at a higher proportion of their maximal capacity (elderly: 42%; young: 30%). Ankle plantarflexion-dorsiflexion angle changes were similar between groups, which meant that the elderly operated at a higher proportion of their maximal assisted dorsiflexion angle. These results indicate that the elderly redistribute the joint moments in order to maintain the task demands within 'safe' limits. 相似文献