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Upregulation of Divalent Metal Transporter 1 (DMT1) Is Involved in Amyloid Precursor Protein Processing and Aβ Generation 被引量:8
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作者 Wei Zheng , 1, Na Xin , 1, Zhi-Hong Chi , Jie Zhang , Bo-Lu Zhao , Jia-Yi Li , Zhan-You Wang , 2 Key Laboratory of Cell Biology, Ministry of Public Health of China, Laboratory of Cell Engineering, China Medical University, Shenyang, PR China State Key laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Academia Sinica, Beijing, PR China Department of Experimental Medical Science, Lund University, Sweden 《生物物理学报》 CAS CSCD 北大核心 2009年第S1期110-110,共1页
The amyloid beta precursor protein (APP) and its pathogenic byproduct β-amyloid peptide (Aβ) play central roles in the pathogenesis of Alzheimer’s disease (AD). Reduction in
关键词 DMT1 GENERATION Is Involved in Amyloid Precursor protein processing and A Upregulation of Divalent Metal Transporter 1
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Full-length core sequence dependent complex-type glycosylation of hepatitis C virus E2 glycoprotein 被引量:10
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作者 CarolineStaib GerdSutter 《World Journal of Gastroenterology》 SCIE CAS CSCD 2002年第3期499-504,共6页
AIM: To study HCV polyprotein processing is important for the understanding of the natural history of HCV and the design of vaccines against HCV. The purpose of this study is to investigate the affection of context se... AIM: To study HCV polyprotein processing is important for the understanding of the natural history of HCV and the design of vaccines against HCV. The purpose of this study is to investigate the affection of context sequences on hepatitis C virus (HCV) E2 processing. METHODS: HCV genes of different lengths were expressed and compared in vaccinia virus/T7 system with homologous patient serum S94 and mouse anti-serum M( E2116) raised against E.coli -derived E2 peptide, respectively.Deglycosylation analysis and GNA ( Galanthus nivalus ) lectin binding assay were performed to study the post-translational processing of the expressed products. RESULTS: E2 glycoproteins with different molecular weights (-75 kDa and -60 kDa) were detected using S94 and M( E2116), respectively. Deglycosylation analysis showed that this difference was mainly due to different glycosylation. Endo H resistance and its failure to bind to GNA lectin demonstrated that the higher molecular weight form (75 kDa) of E2 was complex-type glycosylated, which was readily recognized by homologous patient serum S94. Expression of complex-type glycosylated E2 could not be detected in all of the core-truncated constructs tested, but readily detected in constructs encoding full-length core sequences. CONCLUSION: The upstream conserved full-length core coding sequence was required for the production of E2 glycoproteins carrying complex-type N-glycans which reacted strongly with homologous patient serum and therefore possibly represented more mature forms of E2. As complex-type N-glycans indicated modification by Golgi enzymes, the results suggest that the presence of full-length core might be critical for E1/E2 complex to leave ER. Our data may contribute to a better understanding of the processing of HCV structural proteins as well as HCV morphogenesis. 展开更多
关键词 Animals Cell Line GLYCOSYLATION Hela Cells HEPACIVIRUS Hepatitis C Antibodies Humans Molecular Weight protein processing Post-Translational Research Support Non-U.S. Gov't Viral Envelope proteins
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The characterization of transmembrane protein 59-like(TMEM59L)reveals its role in the regulating the level of the GDI protein family
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作者 HAIFENG WANG JUAN GUO TIEQIAO WEN 《BIOCELL》 SCIE 2022年第12期2615-2624,共10页
The characterization and functions of transmembrane protein 59-like(TMEM59L),a type I transmembrane protein,are not clearly understood until now.Some TMEM59L and fluorescent fusion proteins constructs were transfected... The characterization and functions of transmembrane protein 59-like(TMEM59L),a type I transmembrane protein,are not clearly understood until now.Some TMEM59L and fluorescent fusion proteins constructs were transfected in cell lines and liposomes,and their localization was observed.The effects of protein constructs were studied by fluorescence microscopy and western blotting.This study reports a novel function of human TMEM59L(hTMEM59L)related to the expression and location of some proteins.In addition,we report two novel splice variants of human TMEM59L(hTMEM59L).The localization of mutants of this protein,lacking a middle region,and a Cterminal deletion,markedly differed from that of full-length hTMEM59L.Intracellular movement assessment in living cells showed the localization of TMEM59L to vesicular structures in the Golgi bodies,and the cell membrane was observed in living cells.Overexpression of TMEM59L markedly increased the level of amyloid precursor protein because of TMEM59L-mediated inhibition of cell membrane transport but did not affect the expression of betasecretase 2.TMEM59L overexpression also significantly increased the levels of Rab GDP dissociation inhibitor alpha and Rab GDP dissociation inhibitor beta proteins.These results suggest that TMEM59L is involved in the packaging of acidic vesicles and thereby functions in the trafficking and processing of intracellular proteins. 展开更多
关键词 TMEM59L LOCALIZATION GDI1 GDI2 protein processing
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The Role of Vacuolar Processing Enzyme 被引量:1
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作者 王墨洋 韩宝达 +1 位作者 赵翔 李立新 《Agricultural Science & Technology》 CAS 2012年第5期945-951,共7页
The classification, characters and maturation methods of VPEs were sum- marized, and its regulation function to vacuolar was also analyzed. Furthermore, effects of the enzyme in vacuolar-mediated plant defense mechani... The classification, characters and maturation methods of VPEs were sum- marized, and its regulation function to vacuolar was also analyzed. Furthermore, effects of the enzyme in vacuolar-mediated plant defense mechanism were discussed to point out that VPEs were divided into 3 subfamilies via autocatalytic mature including seed-type VPE, vegetative-type VPE and new-type VPE. Especially, seed- type VPE mediated the process of storage protein, while vegetative-type VPE and new-type VPE regulated and controlled programmed death of plant cells. 展开更多
关键词 VACUOLE VPE Process and maturation of proteins Programmed cell death
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Effect of the desolventizing/toasting process on chemical composition and protein quality of rapeseed meal 被引量:2
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作者 Rainer Mosenthin Ulrike Messerschmidt +3 位作者 Nadja Sauer Patrick Carre Alain Quinsac Friedrich Schone 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2017年第1期205-216,共12页
Background: During processing in a desolventizer/toaster(DT), rapeseed meal(RSM) is heated to evaporate the hexane and to reduce the level of heat-labile anti-nutritional factors such as glucosinolates(GSL). Ho... Background: During processing in a desolventizer/toaster(DT), rapeseed meal(RSM) is heated to evaporate the hexane and to reduce the level of heat-labile anti-nutritional factors such as glucosinolates(GSL). However, excessive heat treatment may reduce amino acid(AA) content in addition to lower AA digestibility and availability in RSM. The objective of the present study was to produce from one batch of a 00-rapeseed variety(17 μmol GSL/g dry matter(DM), seed grade quality) five differently processed RSM under standardized and defined conditions in a pilot plant,and to determine the impact of these different treatments on protein solubility and chemical composition, in particular with regard to contents of AA including reactive Lys(rL ys) and levels of total and individual GSL.Methods: Four RSM were exposed to wet toasting conditions(WetT C) with increasing residence time in the DT of 48,64, 76, and 93 min. A blend of these four RSM was further processed, starting with saturated steam processing(〈 100 °C)and followed by exposure to dry toasting conditions(DryT C) to further reduce the GSL content in this RSM.Results: The contents of neutral detergent fiber and neutral detergent fiber bound crude protein(CP) increased linearly(P 〈 0.05), as residence time of RSM in the DT increased from 48 to 93 min, whereas contents of total and most individual GSL and those of Lys, rL ys, Cys, and the calculated ratio of Lys:CP and r Lys:CP decreased linearly(P ≤ 0.05).The combination of wet heating and DryT C resulted in the lowest GSL content compared to RSM produced under WetT C, but was associated with lowest protein solubility.Conclusions: It can be concluded that by increasing residence time in the DT or using alternative processing conditions such as wet heating combined with DryT C, contents of total and individual GSL in RSM can be substantially reduced.Further in vivo studies are warranted to elucidate if and to which extent the observed differences in protein quality and GSL content between RSM may affect digestibility and bioavailability of AA in monogastric animals. 展开更多
关键词 Anti-nutritional factor Glucosinolate processing protein quality Rapeseed meal
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Label-Free and Real-Time Monitor of Binding and Dissociation Processes between Protein A and Swine IgG by Oblique-Incidence Reflectivity Difference Method
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作者 何立平 刘爽 +6 位作者 戴俊 吴琳 刘国振 韦汉福 吕惠宾 金奎娟 杨国桢 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第2期35-38,共4页
Life science has a need for detection methods that are label-free and real-time. In this paper, we have selected staphylococcal protein A (SPA) and swine immunoglobulin G (IgG), and monitor the bindings between SP... Life science has a need for detection methods that are label-free and real-time. In this paper, we have selected staphylococcal protein A (SPA) and swine immunoglobulin G (IgG), and monitor the bindings between SPA and swine IgG with different concentrations, as well as the dissociations of SPA-swine IgG complex in different pH values of phosphate buffer by oblique-incidence reflectivity difference (OIRD) in a label-free and real-time fashion. We obtain the ON and OFF reaction dynamic curves corresponding to the bindings and dissociations of SPA and swine IgG. Through our analysis of the experimental results, we have been able to obtain the damping coefficients and the dissociation time of SPA and swine IgG for different pH values of the phosphate buffer. The results prove that the OIRD technique is a competing method for monitoring the dynamic processes of biomolecule interaction and achieving the quantitative information of reaction kinetics. 展开更多
关键词 SPA pH Label-Free and Real-Time Monitor of Binding and Dissociation Processes between protein A and Swine IgG by Oblique-Incidence Reflectivity Difference Method IGG
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Analysis of differentially expressed genes in the sea cucumber Apostichopus japonicus under heat stress
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作者 Dongxue Xu Jingjing Zhang +5 位作者 Wenqi Song Lina Sun Ji Liu Yuanxue Gu Yanru Chen Bin Xia 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2023年第11期117-126,共10页
The sea cucumber Apostichopus japonicus plays important roles in marine benthic ecosystem as environmental cleaners,and it is the important aquaculture species in China.High water temperature poses critical threat for... The sea cucumber Apostichopus japonicus plays important roles in marine benthic ecosystem as environmental cleaners,and it is the important aquaculture species in China.High water temperature poses critical threat for the survival of A.japonicus,which has resulted in extensive death in summer.To explore the genes expression profiles under different levels of heat stress,the high-throughput RNA-seq was applied in this study.Our results revealed a total of 1371,1225 and 1408 differentially expressed genes(DEGs)in 26℃for 6 h,26℃for 48 h and 30℃for 6 h respectively in comparison with Control group.The pathway analysis suggested“Protein processing in endoplasmic reticulum(ER)”was significantly enriched in all these heat stress(HS)treatment groups.The expression results of key DEGs in this pathway(Hsp70,Derlin,NEF,PDI,GPR94 and ERP57)by qRT-PCR was in accordance with the RNA-seq data.The subcluster analysis of DEGs revealed that a variety of heat shock proteins(HSPs)and calcium ion binding proteins had an obvious up-regulated expression in 26℃for 6 h,comparatively low expression in 26℃for 48 h,and the highest expression in 30℃for 6 h.The other DEGs subcluster,consisting of critical components of extracellular matrix(ECM)and a subset of peptidases and proteases,showed significantly rising tendency in 30℃for 6 h.Additionally,the expression of matrix metalloproteases(MMP1,MMP16 and MMP19)was prominently affected by HS,and peaked in 30℃for 6 h.This study provides a series of candidate genes for further study about heat shock response in A.japonicus,especially genes associated with protein processing in ER and regulation of ECM,which also offers new insights into cellular homeostasis under stressful conditions in marine invertebrates. 展开更多
关键词 Apostichopus japonicus heat stress RNA-SEQ protein processing extracellular matrix
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Common therapeutic target for both cancer and obesity
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作者 Yie-Hwa Chang 《World Journal of Biological Chemistry》 CAS 2017年第2期102-107,共6页
Obesity and cancer are two interrelated conditions of high epidemiological need, with studies showing that obesity is responsible for nearly 25% of the relative contribution to cancer incidence. Given the connection b... Obesity and cancer are two interrelated conditions of high epidemiological need, with studies showing that obesity is responsible for nearly 25% of the relative contribution to cancer incidence. Given the connection between these conditions, a drug that can operate on both obesity and cancer is highly desirable. Such a drug is accomplishablethrough the development of potent anti-angiogenesis agents due to the shared underlying role of angiogenesis in the development of both diseases. Prior research has demonstrated a key role of type-2 methionine aminopeptidase(Met AP2) for angiogenesis, which has led to the development of numerous of novel inhibitors. Several irreversible Met AP2 inhibitors have entered clinical trials without great success. Though this lack of success could be attributed to off-target adverse effects, the underlying causes remain unclear. More promising reversible inhibitors have been recently developed with excellent pre-clinical results. However, due to insufficient knowledge of the biological functions of N-terminal protein processing, it is hard to predict whether these novel inhibitors would successfully pass clinical trials and thereby benefit cancer and obesity patients. Significantly more efforts are needed to advance our understanding of the regulation of methionine aminopeptidases and the processes by which they govern the function of proteins. 展开更多
关键词 Methionine aminopeptidase ANGIOGENESIS CANCER OBESITY DIABETES protein processing protein stability protein maturation protein modification
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Sorting and Processing of the Alzheimer's Disease Amyloid Precursor Protein Mediated by the AP-4 Complex
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作者 Patricia V.Burgos Gonzalo A.Mardones +2 位作者 Luis L.P.daSilva Yogikala Prabhu Juan S.Bonifacino 《生物物理学报》 CAS CSCD 北大核心 2009年第S1期1-1,共1页
Proteolytic processing of the transmembrane amyloid precursor protein (APP) to aggregation-prone amyloid-β (Aβ) peptide underlies the development of Alzheimer’s disease.
关键词 AP Sorting and processing of the Alzheimer’s Disease Amyloid Precursor protein Mediated by the AP-4 Complex
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Visualization of amino acid composition differences between processed protein from different animal species by self-organizing feature maps
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作者 Xingfan ZHOU Zengling YANG +1 位作者 Longjian CHEN Lujia HAN 《Frontiers of Agricultural Science and Engineering》 2016年第2期171-180,共10页
Amino acids are the dominant organic components of processed animal proteins,however there has been limited investigation of differences in their composition between various protein sources.Information on these differ... Amino acids are the dominant organic components of processed animal proteins,however there has been limited investigation of differences in their composition between various protein sources.Information on these differences will not only be helpful for their further utilization but also provide fundamental information for developing species-specific identification methods.In this study,self-organizing feature maps(SOFM) were used to visualize amino acid composition of fish meal,and meat and bone meal(MBM) produced from poultry,ruminants and swine.SOFM display the similarities and differences in amino acid composition between protein sources and effectively improve data transparency.Amino acid composition was shown to be useful for distinguishing fish meal from MBM due to their large concentration differences between glycine,lysine and proline.However,the amino acid composition of the three MBMs was quite similar.The SOFM results were consistent with those obtained by analysis of variance and principal component analysis but more straightforward.SOFM was shown to have a robust sample linkage capacity and to be able to act as a powerful means to link different sample for further data mining. 展开更多
关键词 self-organizing feature maps VISUALIZATION processed animal proteins(PAPs) amino acid
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