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Wang Y, Liu P, Ye Y, Hammock BD, Zhang C. An Integrated Approach to Improve the Assay Performance of Quantum Dot-Based Lateral Flow Immunoassays by Using Silver Deposition. Microchem J 2023; 192:108932. [PMID: 38344211 PMCID: PMC10857874 DOI: 10.1016/j.microc.2023.108932] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
Traditional quantum dot-based lateral flow immunoassay (QD-LFIA) is limited to signal loss in part by the blinking, photobleaching and oxidative quenching of QD probes. Inspired by the good application of silver deposition on QD surfaces in tissue imaging, and in the context of improving the assay performance without compromising the simplicity and practicality, we report that introducing the QD-silver combination to the LFIA system, has the advantages of accuracy improvement, signal enhancement and user friendliness promotion, but maintains the cost-effective property and commercial accessibility of QD-LFIA. The effect was shown by using CdSe/ZnS QD-LFIA coupled with anti-sodium pentachlorophenate antibody, which provided a 4-fold improvement in the signal, a 2.5-fold improvement in the detection limit and a zero false-negative rate for sodium pentachlorophenate analysis in chicken samples. The proposed LFIA integrates the possibilities of colorimetric and fluorometric detection with different detection limits (fluorometric at 10 ng/mL and colorimetric at 4 ng/mL) and with acceptable detection times (fluorometric at 12 min and colorimetric at 27 min). The current results indicate that this QD-silver combined LFIA is complementary to conventional fluorescence LFIA and could be an inexpensive, versatile, and sensitive alternative.
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Affiliation(s)
- Yulong Wang
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, China
- Anhui Science and Technology University, Fengyang 233100, China
| | - Pengyan Liu
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Yuhui Ye
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Bruce D. Hammock
- Department of Entomology and Nematology, UCD Comprehensive Cancer Center, University of California, Davis, CA 95616, USA
| | - Cunzheng Zhang
- Key Lab of Food Quality and Safety of Jiangsu Province-State Key Laboratory Breeding Base, Ministry of Agriculture, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
- Anhui Science and Technology University, Fengyang 233100, China
- School of Biology and food engineering, Jiangsu University, Zhenjiang 212013, China
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Liu H, Cheng H, Xu J, Hu J, Zhao C, Xing L, Wang M, Wu Z, Peng D, Yu N, Liu J. Genetic diversity and population structure of Polygonatum cyrtonema Hua in China using SSR markers. PLoS One 2023; 18:e0290605. [PMID: 37651363 PMCID: PMC10470896 DOI: 10.1371/journal.pone.0290605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 08/11/2023] [Indexed: 09/02/2023] Open
Abstract
Polygonatum cyrtonema Hua is a perennial herbaceous plant of the Polygonatum genus, belonging to the Liliaceae family, with significant medicinal and nutritional value. In China, this species is a traditional medicinal and edible herb with a long history of application and is widely appreciated by the people. However, as the demand for medicinal herbs continues to grow, excessive harvesting has led to the depletion of wild resources and the risk of genetic erosion. In addition, the chaotic cultivation of varieties and the lack of high quality germplasm resources have led to inconsistent quality of medical materials. Therefore, it is urgent to conduct genetic diversity evaluation of this species and establish a sound conservation plan. This study assessed the genetic diversity and population structure of 96 samples collected from seven regions in China using the simple sequence repeat (SSR) molecular marker technology. In this study, a total of 60 alleles (Na) were detected across the 10 polymorphic SSR markers used, with an average of 6.0 alleles generated per locus. The values of polymorphic information content (PIC) values ranged from 0.3396 to 0.8794, with an average value of 0.6430. The average value of the effective number of alleles (Ne) was 2.761, and the average value of the Shannon's information index (I) was 1.196. The population structure analysis indicates that the Polygonatum cyrtonema Hua germplasm can be classified into three subpopulations (JZ, QY, JD) at the molecular level, which corresponds to the previous subgroups identified based on individual plant phenotypic traits. Analysis of Molecular Variance (AMOVA) showed that 74% of the genetic variation was between individuals within populations in different regions. The phylogenetic analysis of the 96 germplasm samples divided them into three main populations. The QY and JD subpopulations are largely clustered together, which could be attributed to their mountainous distribution and the local climate environment. The genetic differentiation coefficient (Fst) value was low at 0.065, indicating relatively low population differentiation. The ratio of the genetic differentiation coefficient (Fst) between the JZ population and the other two populations (QY and JD) is much higher than the ratio between the QY and JD populations. Based on the clustering results and the ratio of the genetic differentiation coefficient (Fst), it can be inferred that the genetic relationship between the QY and JD subpopulations is closer, with a certain degree of genetic differentiation from the JZ subpopulation. This study supports the conservation of germplasm resources of Polygonatum cyrtonema Hua in China and provides new parental material for germplasm genetic improvement and breeding programs.
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Affiliation(s)
- Heng Liu
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
| | - He Cheng
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
| | - Jun Xu
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
| | - Jiayi Hu
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
| | - Chenchen Zhao
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
| | - Lihua Xing
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
- MOE-Anhui Joint Collaborative Innovation Center for Quality Improvement of Anhui Genuine Chinese Medicinal Materials, Hefei, Anhui Province, China
| | - Mengjin Wang
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
| | - Zhendong Wu
- Anhui Qingyang County Jiuhua traditional Chinese Medicinal Materials Technology Co., Ltd, Chizhou City, Anhui Province, China
| | - Daiyin Peng
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
- MOE-Anhui Joint Collaborative Innovation Center for Quality Improvement of Anhui Genuine Chinese Medicinal Materials, Hefei, Anhui Province, China
| | - Nianjun Yu
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
- MOE-Anhui Joint Collaborative Innovation Center for Quality Improvement of Anhui Genuine Chinese Medicinal Materials, Hefei, Anhui Province, China
| | - Junling Liu
- Department of Biopharmaceuticals, College of Pharmacy, Anhui University of Chinese Medicine, Hefei, Anhui Province, China
- Anhui Provincial Institutes for Food and Drug Control, Hefei, Anhui Province, China
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3
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Koper K, Hwang SK, Wood M, Singh S, Cousins A, Kirchhoff H, Okita TW. The Rice Plastidial Phosphorylase Participates Directly in Both Sink and Source Processes. ACTA ACUST UNITED AC 2020; 62:125-142. [DOI: 10.1093/pcp/pcaa146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Accepted: 11/11/2020] [Indexed: 12/19/2022]
Abstract
Abstract
The plastidial starch phosphorylase (Pho1) functions in starch metabolism. A distinctive structural feature of the higher Pho1 is a 50–82-amino-acid long peptide (L50–L82), which is absent in phosphorylases from non-plant organisms. To study the function of the rice Pho1 L80 peptide, we complemented a pho1− rice mutant (BMF136) with the wild-type Pho1 gene or with a Pho1 gene lacking the L80 region (Pho1ΔL80). While expression of Pho1 in BMF136 restored normal wild-type phenotype, the introduction of Pho1ΔL80 enhanced the growth rate and plant productivity above wild-type levels. Mass spectrometry analysis of proteins captured by anti-Pho1 showed the surprising presence of PsaC, the terminal electron acceptor/donor subunit of photosystem I (PSI). This unexpected interaction was substantiated by reciprocal immobilized protein pull-down assays of seedling extracts and supported by the presence of Pho1 on isolated PSI complexes resolved by blue-native gels. Spectrophotometric studies showed that Pho1ΔL80 plants exhibited modified PSI and enhanced CO2 assimilation properties. Collectively, these findings indicate that the higher plant Pho1 has dual roles as a potential modulator of source and sink processes.
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Affiliation(s)
- Kaan Koper
- Institute of Biological Chemistry, Washington State University, Pullman, WA 99164, USA
| | - Seon-Kap Hwang
- Institute of Biological Chemistry, Washington State University, Pullman, WA 99164, USA
| | - Magnus Wood
- Institute of Biological Chemistry, Washington State University, Pullman, WA 99164, USA
| | - Salvinder Singh
- Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, Assam 785013, India
| | - Asaph Cousins
- School of Biological Sciences, Washington State University, Pullman, WA 99164, USA
| | - Helmut Kirchhoff
- Institute of Biological Chemistry, Washington State University, Pullman, WA 99164, USA
| | - Thomas W Okita
- Institute of Biological Chemistry, Washington State University, Pullman, WA 99164, USA
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Chia (Salvia hispanica) protein fractions: characterization and emulsifying properties. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2019. [DOI: 10.1007/s11694-019-00254-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Fledrich R, Abdelaal T, Rasch L, Bansal V, Schütza V, Brügger B, Lüchtenborg C, Prukop T, Stenzel J, Rahman RU, Hermes D, Ewers D, Möbius W, Ruhwedel T, Katona I, Weis J, Klein D, Martini R, Brück W, Müller WC, Bonn S, Bechmann I, Nave KA, Stassart RM, Sereda MW. Targeting myelin lipid metabolism as a potential therapeutic strategy in a model of CMT1A neuropathy. Nat Commun 2018; 9:3025. [PMID: 30072689 PMCID: PMC6072747 DOI: 10.1038/s41467-018-05420-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 06/28/2018] [Indexed: 01/17/2023] Open
Abstract
In patients with Charcot-Marie-Tooth disease 1A (CMT1A), peripheral nerves display aberrant myelination during postnatal development, followed by slowly progressive demyelination and axonal loss during adult life. Here, we show that myelinating Schwann cells in a rat model of CMT1A exhibit a developmental defect that includes reduced transcription of genes required for myelin lipid biosynthesis. Consequently, lipid incorporation into myelin is reduced, leading to an overall distorted stoichiometry of myelin proteins and lipids with ultrastructural changes of the myelin sheath. Substitution of phosphatidylcholine and phosphatidylethanolamine in the diet is sufficient to overcome the myelination deficit of affected Schwann cells in vivo. This treatment rescues the number of myelinated axons in the peripheral nerves of the CMT rats and leads to a marked amelioration of neuropathic symptoms. We propose that lipid supplementation is an easily translatable potential therapeutic approach in CMT1A and possibly other dysmyelinating neuropathies.
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Affiliation(s)
- R Fledrich
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany.
- Institute of Anatomy, University of Leipzig, Leipzig, 04103, Germany.
- Department of Neuropathology, University Hospital Leipzig, Leipzig, 04103, Germany.
| | - T Abdelaal
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany
- Department of Clinical Neurophysiology, University Medical Center Göttingen, Göttingen, 37075, Germany
- Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Division, National Research Centre, Giza, 12622, Egypt
| | - L Rasch
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany
- Department of Clinical Neurophysiology, University Medical Center Göttingen, Göttingen, 37075, Germany
| | - V Bansal
- Center for Molecular Neurobiology, Institute of Medical Systems Biology, University Medical Center Hamburg-Eppendorf, Hamburg, 20251, Germany
| | - V Schütza
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany
- Department of Neuropathology, University Hospital Leipzig, Leipzig, 04103, Germany
| | - B Brügger
- Heidelberg University Biochemistry Center (BZH), Heidelberg, 69120, Germany
| | - C Lüchtenborg
- Heidelberg University Biochemistry Center (BZH), Heidelberg, 69120, Germany
| | - T Prukop
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany
- Department of Clinical Neurophysiology, University Medical Center Göttingen, Göttingen, 37075, Germany
- Institute of Clinical Pharmacology, University Medical Center Göttingen, Göttingen, 37075, Germany
| | - J Stenzel
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany
- Department of Clinical Neurophysiology, University Medical Center Göttingen, Göttingen, 37075, Germany
| | - R U Rahman
- Center for Molecular Neurobiology, Institute of Medical Systems Biology, University Medical Center Hamburg-Eppendorf, Hamburg, 20251, Germany
| | - D Hermes
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany
- Department of Clinical Neurophysiology, University Medical Center Göttingen, Göttingen, 37075, Germany
| | - D Ewers
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany
- Department of Clinical Neurophysiology, University Medical Center Göttingen, Göttingen, 37075, Germany
| | - W Möbius
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany
- Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, 37075, Germany
| | - T Ruhwedel
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany
| | - I Katona
- Institute of Neuropathology, University Hospital Aachen, Aachen, 52074, Germany
| | - J Weis
- Institute of Neuropathology, University Hospital Aachen, Aachen, 52074, Germany
| | - D Klein
- Department of Neurology, Section of Developmental Neurobiology, University Hospital Wuerzburg, Wuerzburg, 97080, Germany
| | - R Martini
- Department of Neurology, Section of Developmental Neurobiology, University Hospital Wuerzburg, Wuerzburg, 97080, Germany
| | - W Brück
- Institute of Neuropathology, University Medical Center Göttingen, Göttingen, 37075, Germany
| | - W C Müller
- Department of Neuropathology, University Hospital Leipzig, Leipzig, 04103, Germany
| | - S Bonn
- Center for Molecular Neurobiology, Institute of Medical Systems Biology, University Medical Center Hamburg-Eppendorf, Hamburg, 20251, Germany
- German Center for Neurodegenerative Diseases, Tübingen, 72076, Germany
| | - I Bechmann
- Institute of Anatomy, University of Leipzig, Leipzig, 04103, Germany
| | - K A Nave
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany.
| | - R M Stassart
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany.
- Department of Neuropathology, University Hospital Leipzig, Leipzig, 04103, Germany.
- Institute of Neuropathology, University Medical Center Göttingen, Göttingen, 37075, Germany.
| | - M W Sereda
- Department of Neurogenetics, Max-Planck-Institute of Experimental Medicine, Göttingen, 37075, Germany.
- Department of Clinical Neurophysiology, University Medical Center Göttingen, Göttingen, 37075, Germany.
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Sharp JA, Brennan AJ, Polekhina G, Ascher DB, Lefevre C, Nicholas KR. Dimeric but not monomeric α-lactalbumin potentiates apoptosis by up regulation of ATF3 and reduction of histone deacetylase activity in primary and immortalised cells. Cell Signal 2017; 33:86-97. [DOI: 10.1016/j.cellsig.2017.02.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 02/02/2017] [Accepted: 02/06/2017] [Indexed: 11/25/2022]
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Hwang SK, Koper K, Satoh H, Okita TW. Rice Endosperm Starch Phosphorylase (Pho1) Assembles with Disproportionating Enzyme (Dpe1) to Form a Protein Complex That Enhances Synthesis of Malto-oligosaccharides. J Biol Chem 2016; 291:19994-20007. [PMID: 27502283 DOI: 10.1074/jbc.m116.735449] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Indexed: 11/06/2022] Open
Abstract
Starch synthesis in cereal grain endosperm is dependent on the concerted actions of many enzymes. The starch plastidial phosphorylase (Pho1) plays an important role in the initiation of starch synthesis and in the maturation of starch granule in developing rice seeds. Prior evidence has suggested that the rice enzyme, OsPho1, may have a physical/functional interaction with other starch biosynthetic enzymes. Pulldown experiments showed that OsPho1 as well as OsPho1 devoid of its L80 region, a peptide unique to higher plant phosphorylases, captures disproportionating enzyme (OsDpe1). Interaction of the latter enzyme form with OsDpe1 indicates that the putative regulatory L80 is not responsible for multienzyme assembly. This heterotypic enzyme complex, determined at a molar ratio of 1:1, was validated by reciprocal co-immunoprecipitation studies of native seed proteins and by co-elution chromatographic and co-migration electrophoretic patterns of these enzymes in rice seed extracts. The OsPho1-OsDpe1 complex utilized a broader range of substrates for enhanced synthesis of larger maltooligosaccharides than each individual enzyme and significantly elevated the substrate affinities of OsPho1 at 30 °C. Moreover, the assembly with OsDpe1 enables OsPho1 to utilize products of transglycosylation reactions involving G1 and G3, sugars that it cannot catalyze directly.
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Affiliation(s)
- Seon-Kap Hwang
- From the Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340 and
| | - Kaan Koper
- From the Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340 and
| | - Hikaru Satoh
- Faculty of Agriculture, Kyushu University, Fukuoka, 812-8581, Japan
| | - Thomas W Okita
- From the Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340 and
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8
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Herrera Chalé F, Ruiz Ruiz JC, Betancur Ancona D, Acevedo Fernández JJ, Segura Campos MR. The hypolipidemic effect and antithrombotic activity of Mucuna pruriens protein hydrolysates. Food Funct 2016; 7:434-44. [DOI: 10.1039/c5fo01012h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrolysates and peptide fractions (PF) obtained fromM. pruriensprotein concentrates with commercial and digestive enzymatic systems were studied for their hypolipidemic and antithrombotic activities.
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Affiliation(s)
- Francisco Herrera Chalé
- Facultad de Ingeniería Química
- Universidad Autónoma de Yucatán. Periférico Norte Km. 33.5
- 97203 Mérida
- México
| | - Jorge Carlos Ruiz Ruiz
- Departamento de Ingeniería Química-Bioquímica
- Instituto Tecnológico de Mérida. Av. Tecnológico Km 4.5 S/N
- C.P. 97118. Mérida
- México
| | - David Betancur Ancona
- Facultad de Ingeniería Química
- Universidad Autónoma de Yucatán. Periférico Norte Km. 33.5
- 97203 Mérida
- México
| | - Juan José Acevedo Fernández
- Facultad de Medicina
- Universidad Autónoma del Estado de Morelos. Calle Iztaccihuátl Esq. Leñeros S/N
- 62350 Cuernavaca
- Morelos
| | - Maira Rubi Segura Campos
- Facultad de Ingeniería Química
- Universidad Autónoma de Yucatán. Periférico Norte Km. 33.5
- 97203 Mérida
- México
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9
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Saxena R, Singh R. MALDI-TOF MS and CD spectral analysis for identification and structure prediction of a purified, novel, organic solvent stable, fibrinolytic metalloprotease from Bacillus cereus B80. BIOMED RESEARCH INTERNATIONAL 2015; 2015:527015. [PMID: 25802851 PMCID: PMC4352737 DOI: 10.1155/2015/527015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 08/25/2014] [Accepted: 09/30/2014] [Indexed: 12/01/2022]
Abstract
The ability to predict protein function from structure is becoming increasingly important; hence, elucidation and determination of protein structure become the major steps in proteomics. The present study was undertaken for identification of metalloprotease produced by Bacillus cereus B80 and recognition of characteristics that can be industrially exploited. The enzyme was purified in three steps combining precipitation and chromatographic methods resulting in 33.5% recovery with 13.1-fold purification of enzyme which was detected as a single band with a molecular mass of 26 kDa approximately in SDS-PAGE and zymogram. The MALDI-TOF MS showed that the enzyme exhibited 70-93% similarity with zinc metalloproteases from various strains Bacillus sp. specifically from Bacillus cereus group. The sequence alignment revealed the presence of zinc-binding region VVVHEMCHMV in the most conserved C terminus region. Secondary structure of the enzyme was obtained by CD spectra and I-TASSER. The enzyme kinetics revealed a Michaelis constant (Km) of 0.140 μmol/ml and Vmax of 2.11 μmol/min. The application studies showed that the enzyme was able to hydrolyze various proteins with highest affinity towards casein followed by BSA and gelatin. The enzyme exhibited strong fibrinolytic, collagenolytic, and gelatinolytic properties and stability in various organic solvents.
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Affiliation(s)
- Rajshree Saxena
- Amity Institute of Microbial Biotechnology, Amity University, Sector 125, Noida, Uttar Pradesh 201303, India
| | - Rajni Singh
- Amity Institute of Microbial Biotechnology, Amity University, Sector 125, Noida, Uttar Pradesh 201303, India
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10
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Månsson C, Arosio P, Hussein R, Kampinga HH, Hashem RM, Boelens WC, Dobson CM, Knowles TPJ, Linse S, Emanuelsson C. Interaction of the molecular chaperone DNAJB6 with growing amyloid-beta 42 (Aβ42) aggregates leads to sub-stoichiometric inhibition of amyloid formation. J Biol Chem 2014; 289:31066-76. [PMID: 25217638 PMCID: PMC4223311 DOI: 10.1074/jbc.m114.595124] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The human molecular chaperone protein DNAJB6 was recently found to inhibit the formation of amyloid fibrils from polyglutamine peptides associated with neurodegenerative disorders such as Huntington disease. We show in the present study that DNAJB6 also inhibits amyloid formation by an even more aggregation-prone peptide (the amyloid-beta peptide, Aβ42, implicated in Alzheimer disease) in a highly efficient manner. By monitoring fibril formation using Thioflavin T fluorescence and far-UV CD spectroscopy, we have found that the aggregation of Aβ42 is retarded by DNAJB6 in a concentration-dependent manner, extending to very low sub-stoichiometric molar ratios of chaperone to peptide. Quantitative kinetic analysis and immunochemistry studies suggest that the high inhibitory efficiency is due to the interactions of the chaperone with aggregated forms of Aβ42 rather than the monomeric form of the peptide. This interaction prevents the growth of such species to longer fibrils and inhibits the formation of new amyloid fibrils through both primary and secondary nucleation. A low dissociation rate of DNAJB6 from Aβ42 aggregates leads to its incorporation into growing fibrils and hence to its gradual depletion from solution with time. When DNAJB6 is eventually depleted, fibril proliferation takes place, but the inhibitory activity can be prolonged by introducing DNAJB6 at regular intervals during the aggregation reaction. These results reveal the highly efficacious mode of action of this molecular chaperone against protein aggregation, and demonstrate that the role of molecular chaperones can involve interactions with multiple aggregated species leading to the inhibition of both principal nucleation pathways through which aggregates are able to form.
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Affiliation(s)
- Cecilia Månsson
- From the Department of Biochemistry & Structural Biology, Center for Molecular Protein Science, Lund University, PO box 124, 221 00 Lund, Sweden
| | - Paolo Arosio
- Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
| | - Rasha Hussein
- Department of Cell Biology, UMCG and RuG, Groningen, The Netherlands, Department of Biochemistry, Faculty of Pharmacy, Beni-Suef University, Salah Salem Street, 62511 Beni-Suef, Egypt, and
| | - Harm H Kampinga
- Department of Cell Biology, UMCG and RuG, Groningen, The Netherlands
| | - Reem M Hashem
- Department of Biochemistry, Faculty of Pharmacy, Beni-Suef University, Salah Salem Street, 62511 Beni-Suef, Egypt, and
| | - Wilbert C Boelens
- Department of Biomolecular Chemistry, Radboud University Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Christopher M Dobson
- Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
| | - Tuomas P J Knowles
- Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
| | - Sara Linse
- From the Department of Biochemistry & Structural Biology, Center for Molecular Protein Science, Lund University, PO box 124, 221 00 Lund, Sweden
| | - Cecilia Emanuelsson
- From the Department of Biochemistry & Structural Biology, Center for Molecular Protein Science, Lund University, PO box 124, 221 00 Lund, Sweden,
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11
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Khiari Z, Rico D, Martin-Diana AB, Barry-Ryan C. Structure elucidation of ACE-inhibitory and antithrombotic peptides isolated from mackerel skin gelatine hydrolysates. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2014; 94:1663-1671. [PMID: 24214841 DOI: 10.1002/jsfa.6476] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Revised: 09/06/2013] [Accepted: 11/09/2013] [Indexed: 06/02/2023]
Abstract
BACKGROUND The fish-processing industry generates significant amounts of waste and by-products that are usually discarded. This study investigated the preparation of bioactive gelatine peptides from fish skin. Gelatine was extracted from mackerel (Scomber scombrus) skin and hydrolysed by pepsin for 1, 2, 6 and 24 h. All hydrolysates were screened for antioxidant, ACE-inhibitory and antithrombotic activities. RESULTS Gelatine peptides obtained after 24 h of hydrolysis exhibited the highest antioxidant activity (DPPH reduction ∼80%, FRAP ∼130 µmol Trolox equivalent L(-1) ). These hydrolysates had high ACE-inhibitory activity (>70%) and were able to significantly (P < 0.05) inhibit platelet aggregation by about 30%, corresponding to moderate antithrombotic activity. CONCLUSION The bioactive properties were mainly due to the presence of low-molecular-weight peptides of 337 and 423 Da.
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Affiliation(s)
- Zied Khiari
- School of Food Science and Environmental Health, Dublin Institute of Technology (DIT), Cathal Brugha Street, Dublin 1, Ireland
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Thornton CR, Ryder LS, Le Cocq K, Soanes DM. Identifying the emerging human pathogen Scedosporium prolificans by using a species-specific monoclonal antibody that binds to the melanin biosynthetic enzyme tetrahydroxynaphthalene reductase. Environ Microbiol 2014; 17:1023-38. [PMID: 24684242 DOI: 10.1111/1462-2920.12470] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2013] [Revised: 02/11/2014] [Accepted: 02/18/2014] [Indexed: 12/13/2022]
Abstract
The dematiaceous (melanized) fungus Scedosporium prolificans is an emerging and frequently fatal pathogen of immunocompromised humans and which, along with the closely related fungi Pseudallescheria boydii, Scedosporium apiospermum and S. aurantiacum in the Pseudallescheria-Scedosporium complex, is a contributing aetiology to tsunami lung and central nervous system infections in near-drowning victims who have aspirated water laden with spores. At present, the natural habitat of the fungus is largely unknown, and accurate detection methods are needed to identify environmental reservoirs of infectious propagules. In this study, we report the development of a monoclonal antibody (mAb) (CA4) specific to S. prolificans, which does not cross-react with closely related fungi in the Pseudallescheria-Scedosporium complex or with a wide range of mould and yeast species pathogenic to humans. Using genome sequencing of a soil isolate and targeted gene disruption of the CA4 antigen-encoding gene, we show that mAb CA4 binds to the melanin-biosynthetic enzyme tetrahydroxynaphthalene reductase. Enzyme-deficient mutants produce orange-brown or green-brown spore suspensions compared with the black spore suspension of the wild-type strain. Using mAb CA4 and a mAb (HG12) specific to the related fungi P. boydii, P. apiosperma, S. apiospermum and S. aurantiacum, we demonstrate how the mAbs can be used in combination with a semiselective isolation procedure to track these opportunistic pathogens in environmental samples containing mixed populations of human pathogenic fungi. Specificity of mAb CA4 was confirmed by sequencing of the internally transcribed spacer 1 (ITS1)-5.8S-ITS2 rRNA-encoding regions of fungi isolated from estuarine muds.
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Affiliation(s)
- Christopher R Thornton
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4QD, UK
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13
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Montowska M, Pospiech E. Species-specific expression of various proteins in meat tissue: Proteomic analysis of raw and cooked meat and meat products made from beef, pork and selected poultry species. Food Chem 2013. [DOI: 10.1016/j.foodchem.2012.09.072] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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14
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Myosin light chain isoforms retain their species-specific electrophoretic mobility after processing, which enables differentiation between six species: 2DE analysis of minced meat and meat products made from beef, pork and poultry. Proteomics 2012; 12:2879-89. [DOI: 10.1002/pmic.201200043] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Belyakov AY, Burygin GL, Arbatsky NP, Shashkov AS, Selivanov NY, Matora LY, Knirel YA, Shchyogolev SY. Identification of an O-linked repetitive glycan chain of the polar flagellum flagellin of Azospirillum brasilense Sp7. Carbohydr Res 2012; 361:127-32. [PMID: 23017779 DOI: 10.1016/j.carres.2012.08.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2012] [Revised: 08/25/2012] [Accepted: 08/27/2012] [Indexed: 10/27/2022]
Abstract
This is the first report to have identified an O-linked repetitive glycan in bacterial flagellin, a structural protein of the flagellum. Studies by sugar analysis, Smith degradation, (1)H and (13)C NMR spectroscopy, and mass spectrometry showed that the glycan chains of the polar flagellum flagellin of the plant-growth-promoting rhizobacterium Azospirillum brasilense Sp7 are represented by a polysaccharide with a molecular mass of 7.7 kDa, which has a branched tetrasaccharide repeating unit of the following structure:
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Affiliation(s)
- Alexei Ye Belyakov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russia
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Redwan EM. SIMPLE, SENSITIVE, AND QUICK PROTOCOL TO DETECT LESS THAN 1 NG OF BACTERIAL LIPOPOLYSACCHARIDE. Prep Biochem Biotechnol 2012; 42:171-82. [DOI: 10.1080/10826068.2011.586081] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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17
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Wang Y, Zhang J, Huang L, He D, Ma L, Ouyang J, Jiang F. Novel Application of Ag Nanoclusters in Fluorescent Imaging of Human Serum Proteins after Native Polyacrylamide Gel Electrophoresis (PAGE). Chemistry 2012; 18:1432-7. [DOI: 10.1002/chem.201101310] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Revised: 10/21/2011] [Indexed: 11/07/2022]
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18
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Gómez-Pastor R, Pérez-Torrado R, Cabiscol E, Ros J, Matallana E. Engineered Trx2p industrial yeast strain protects glycolysis and fermentation proteins from oxidative carbonylation during biomass propagation. Microb Cell Fact 2012; 11:4. [PMID: 22230188 PMCID: PMC3280929 DOI: 10.1186/1475-2859-11-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 01/09/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In the yeast biomass production process, protein carbonylation has severe adverse effects since it diminishes biomass yield and profitability of industrial production plants. However, this significant detriment of yeast performance can be alleviated by increasing thioredoxins levels. Thioredoxins are important antioxidant defenses implicated in many functions in cells, and their primordial functions include scavenging of reactive oxygen species that produce dramatic and irreversible alterations such as protein carbonylation. RESULTS In this work we have found several proteins specifically protected by yeast Thioredoxin 2 (Trx2p). Bidimensional electrophoresis and carbonylated protein identification from TRX-deficient and TRX-overexpressing cells revealed that glycolysis and fermentation-related proteins are specific targets of Trx2p protection. Indeed, the TRX2 overexpressing strain presented increased activity of the central carbon metabolism enzymes. Interestingly, Trx2p specifically preserved alcohol dehydrogenase I (Adh1p) from carbonylation, decreased oligomer aggregates and increased its enzymatic activity. CONCLUSIONS The identified proteins suggest that the fermentative capacity detriment observed under industrial conditions in T73 wine commercial strain results from the oxidative carbonylation of specific glycolytic and fermentation enzymes. Indeed, increased thioredoxin levels enhance the performance of key fermentation enzymes such as Adh1p, which consequently increases fermentative capacity.
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Affiliation(s)
- Rocío Gómez-Pastor
- Departamento de Biotecnología, Instituto de Agroquímica y Tecnología de Alimentos, CSIC, Apartado de Correos, 73. Burjassot (Valencia). E-46100, Spain
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Montowska M, Pospiech E. Differences in two-dimensional gel electrophoresis patterns of skeletal muscle myosin light chain isoforms between Bos taurus, Sus scrofa and selected poultry species. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2011; 91:2449-2456. [PMID: 21656778 DOI: 10.1002/jsfa.4486] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Revised: 03/17/2011] [Accepted: 04/19/2011] [Indexed: 05/30/2023]
Abstract
BACKGROUND In this study the interspecies differences in two-dimensional electrophoresis patterns of skeletal muscle myosin light chain (MLC) isoforms between Bos taurus (cattle), Sus scrofa (pig), Gallus gallus (chicken), Meleagris gallopavo (turkey), Anas platyrhynchos (duck) and Anser anser (goose) were characterised on the basis of specific properties of MLCs associated with their structure and mobility in gel. RESULTS Two-dimensional electrophoresis separations revealed species-specific differences in the molecular weight and pI of individual MLC isoforms (MLC1f, MLC2f and MLC3f). In the case of closely related animal species such as goose and duck or turkey and chicken, significant differences occurred in MLC1f. For MLC2f, differences between cattle and turkey and between pig and chicken were around 1 and 0.3 kDa respectively. It appeared from the comparison of amino acid sequences that even MLCs with only 2% difference in sequences have different electrophoretic mobilities. CONCLUSION Interspecies differences in skeletal MLC isoforms appeared between cattle, pig, chicken, turkey, duck and goose. The slight changes observed in the course of the aging process confirmed that these proteins are relatively little susceptible to proteolytic enzymes during meat aging.
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Affiliation(s)
- Magdalena Montowska
- Institute of Meat Technology, Poznań University of Life Sciences, Poznań, Poland.
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Luo LZ, Jin HW, Huang HQ. Application of capillary isoelectric focusing and peptide mass fingerprinting in carbohydrate-deficient transferrin detection. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2011; 25:1391-1398. [PMID: 21504004 DOI: 10.1002/rcm.4993] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Carbohydrate-deficient transferrin (CDT) is a specific biomarker of alcohol abuse and is widely used in clinical diagnosis to detect and follow up excessive alcohol consumption. However, false %CDT results still exist in CDT detection, because of interference from genetic variants and the lack of standardization in CDT analysis. Therefore, it is still very important to find a method with high sensitivity and high accuracy for CDT detection. Here, we compared the detection sensitivity and accuracy of pI values based methods [isoelectric focusing on polyacrylamide gel electrophoresis (IEF-PAGE) and capillary isoelectric focusing (CIEF)] with hydrophobic characteristic based methods [reversed-phase high-performance liquid chromatography (RP-HPLC)] on CDT detection. Moreover, we investigated the potential of peptide mass fingerprinting (PMF), a method based on the mass spectrometry to identify human transferrin (HTf) variants including CDT isoforms and genetic variants, based on their specific peptide masses. Results indicated that PMF can identify HTf variants including CDT isoforms and genetic variants based on their specific peptides, and CIEF showed higher sensitivity detection of HTf variants than RP-HPLC and IEF-PAGE did. Accordingly, we suggest that PMF is suitable for identifying CDT with high accuracy, and CIEF has potential for detection of CDT and genetic variants with high sensitivity; moreover, they are both worth further investigation in clinical diagnosis.
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Affiliation(s)
- Lian-Zhong Luo
- Key Laboratory of MOE for Cell Biology and Tumor Cell Engineering, School of Life Sciences, Xiamen University, Xiamen 361005, China
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21
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22
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Beyer NH, Milthers J, Bonde Lauridsen AM, Houen G, Lautrup Frederiksen J. Autoantibodies to the proteasome in monosymptomatic optic neuritis may predict progression to multiple sclerosis. Scandinavian Journal of Clinical and Laboratory Investigation 2009; 67:696-706. [PMID: 17852796 DOI: 10.1080/00365510701342062] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
OBJECTIVE Proteasome autoantibodies (PAB) have been found in multiple sclerosis (MS) patient sera and cerebrospinal fluid (CSF). Presence of PAB could thus be a possible diagnostic marker for MS. We investigated whether PAB serum status in acute monosymptomatic optic neuritis (ON) and MS differed significantly from that of healthy controls, and whether or not PAB status is predictive of later MS development in patients with ON. MATERIAL AND METHODS Sera from ON patients, MS patients and healthy donors were analysed retrospectively using ELISA. Subsequently, a small group of PAB-positive samples were subjected to SDS-PAGE, immunoblotting and 2-D PAGE. RESULTS We found that 20 % (6/30) ON patients, 47 % (22/47) MS patients and 9 % (7/81) controls tested PAB positive using ELISA analysis. High PAB levels were found in 2 (4 %) MS patients, 1 (3 %) ON patient and 2 (3 %) controls. PAB positivity in ELISA was confirmed by immunoblotting. Separation of proteasome subunits by 2D PAGE followed by immunoblotting revealed no particular PAB subunit preference. CONCLUSIONS A retrospective search in available patient files revealed that 6 of 6 (100.0 %) PAB-positive ON patients developed MS over time. Eight of 24 (33 %) PAB-negative ON patients developed MS over time and 47 % (14/30) of all ON patients developed MS. A series of patient CSF was analysed by ELISA to assess the possible correlation between PAB status of concurrent serum and CSF samples, but no correlation was found. However, the results from the six PAB-positive ON patients could potentially be of prognostic value.
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Affiliation(s)
- N H Beyer
- Department of Autoimmunology, Statens Serum Institut, Copenhagen, Denmark
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23
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24
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Liu J, Liu X, Baeyens WRG, Delanghe JR, Ouyang J. A Novel Probe Au(III) for Chemiluminescent Image Detection of Protein Blots on Nitrocellulose Membranes. J Proteome Res 2008; 7:1884-90. [DOI: 10.1021/pr700616u] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jia Liu
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China, Department of Pharmaceutical Analysis, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium, and Department of Clinical Chemistry, Microbiology and Immunology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium
| | - Xia Liu
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China, Department of Pharmaceutical Analysis, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium, and Department of Clinical Chemistry, Microbiology and Immunology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium
| | - Willy R. G. Baeyens
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China, Department of Pharmaceutical Analysis, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium, and Department of Clinical Chemistry, Microbiology and Immunology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium
| | - Joris R. Delanghe
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China, Department of Pharmaceutical Analysis, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium, and Department of Clinical Chemistry, Microbiology and Immunology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium
| | - Jin Ouyang
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China, Department of Pharmaceutical Analysis, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, B-9000 Ghent, Belgium, and Department of Clinical Chemistry, Microbiology and Immunology, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium
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Liu J, Ouyang J, Baeyens WRG, Delanghe JR, Wang Z, Liu J, Zhang H. A novel probe for chemiluminescent image detection of proteins in two-dimensional gel electrophoresis. Electrophoresis 2008; 29:716-25. [DOI: 10.1002/elps.200700424] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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26
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Pagh R, Duus K, Laursen I, Hansen PR, Mangor J, Thielens N, Arlaud GJ, Kongerslev L, Højrup P, Houen G. The chaperone and potential mannan-binding lectin (MBL) co-receptor calreticulin interacts with MBL through the binding site for MBL-associated serine proteases. FEBS J 2008; 275:515-26. [DOI: 10.1111/j.1742-4658.2007.06218.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ahrman E, Lambert W, Aquilina JA, Robinson CV, Emanuelsson CS. Chemical cross-linking of the chloroplast localized small heat-shock protein, Hsp21, and the model substrate citrate synthase. Protein Sci 2007; 16:1464-78. [PMID: 17567739 PMCID: PMC2206695 DOI: 10.1110/ps.072831607] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The molecular mechanism whereby the small heat-shock protein (sHsp) chaperones interact with and prevent aggregation of other proteins is not fully understood. We have characterized the sHsp-substrate protein interaction at normal and increased temperatures utilizing a model substrate protein, citrate synthase (CS), widely used in chaperone assays, and a dodecameric plant sHsp, Hsp21, by chemical cross-linking with 3,3'-Dithiobis[sulfosuccinimidylpropionate] (DTSSP) and mass spectrometric peptide mapping. In the absence of CS, the cross-linker captured Hsp21 in dodecameric form, even at increased temperature (47 degrees C). In the presence of equimolar amounts of CS, no Hsp21 dodecamer was captured, indicating a substrate-induced Hsp21 dodecamer dissociation by equimolar amounts of CS. Cross-linked Hsp21-Hsp21 dipeptides indicated an exposure of the Hsp21 C-terminal tails and substrate-binding sites normally covered by the C terminus. Cross-linked Hsp21-CS dipeptides mapped to several sites on the surface of the CS dimer, indicating that there are numerous weak and short-lived interactions between Hsp21 and CS, even at normal temperatures. The N-terminal arms especially interacted with a motif in the CS dimer, which is absent in thermostable forms of CS. The cross-linking data suggest that the presence of substrate rather than temperature influences the conformation of Hsp21.
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Affiliation(s)
- Emma Ahrman
- Department of Biochemistry, Lund University, Sweden.
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Zhang M, Wittstock G, Shao Y, Girault HH. Scanning Electrochemical Microscopy as a Readout Tool for Protein Electrophoresis. Anal Chem 2007; 79:4833-9. [PMID: 17539601 DOI: 10.1021/ac062356k] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Scanning electrochemical microscopy (SECM) was used to image silver-stained proteins on a poly(vinylidene difluoride) membrane. The method is based on measuring the current at a scanning microelectrode in the feedback mode. The electrochemical feedback is caused by the redox-mediated etching of the isolated 5 - 10-nm-diameter silver nanoparticles formed during the staining process. Several parameters, such as the redox mediator and the staining protocol, were optimized to ensure a high resolution and a low detection limit, i.e., 0.5 ng of bovine serum albumin (4 x 10(-14) mol) distributed on an area of 1 mm(2) (4 x 10(-16) mol x cm(-2)). Images of beta-lactoglobulin A and myoglobin bands after gel electrophoretic separation and electroblotting were obtained in order to demonstrate that SECM can be employed as a sensitive and quantitative readout method for detection of proteins after gel electrophoresis. An additional advantage is that the silver staining can be removed, allowing further downstream mass spectrometry analysis.
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Affiliation(s)
- Meiqin Zhang
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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Jin LT, Hwang SY, Yoo GS, Choi JK. A mass spectrometry compatible silver staining method for protein incorporating a new silver sensitizer in sodium dodecyl sulfate-polyacrylamide electrophoresis gels. Proteomics 2006; 6:2334-7. [PMID: 16493709 DOI: 10.1002/pmic.200500596] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A quick, sensitive, and MALDI-TOF MS compatible silver staining method, namely Eriochrome black T (EBT)-silver method, is described. The method can detect 0.05-0.2 ng protein within 60 min in SDS-PAGE gels. EBT dye was used as a silver ion sensitizer having reducing power for silver ions.
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Affiliation(s)
- Li-Tai Jin
- College of Pharmacy, Chonnam National University, Kwangju, South Korea
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Pamplona R, Dalfó E, Ayala V, Bellmunt MJ, Prat J, Ferrer I, Portero-Otín M. Proteins in human brain cortex are modified by oxidation, glycoxidation, and lipoxidation. Effects of Alzheimer disease and identification of lipoxidation targets. J Biol Chem 2005; 280:21522-30. [PMID: 15799962 DOI: 10.1074/jbc.m502255200] [Citation(s) in RCA: 398] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Diverse oxidative pathways, such as direct oxidation of amino acids, glycoxidation, and lipoxidation could contribute to Alzheimer disease pathogenesis. A global survey for the amount of structurally characterized probes for these reactions is lacking and could overcome the lack of specificity derived from measurement of 2,4-dinitrophenylhydrazine reactive carbonyls. Consequently we analyzed (i) the presence and concentrations of glutamic and aminoadipic semialdehydes, N(epsilon)-(carboxymethyl)-lysine, N(epsilon)-(carboxyethyl)-lysine, and N(epsilon)-(malondialdehyde)-lysine by means of gas chromatography/mass spectrometry, (ii) the biological response through expression of the receptor for advanced glycation end products, (iii) the fatty acid composition in brain samples from Alzheimer disease patients and age-matched controls, and (iv) the targets of N(epsilon)-(malondialdehyde)-lysine formation in brain cortex by proteomic techniques. Alzheimer disease was associated with significant, although heterogeneous, increases in the concentrations of all evaluated markers. Alzheimer disease samples presented increases in expression of the receptor for advanced glycation end products with high molecular heterogeneity. Samples from Alzheimer disease patients also showed content of docosahexaenoic acid, which increased lipid peroxidizability. In accordance, N(epsilon)-(malondialdehyde)-lysine formation targeted important proteins for both glial and neuronal homeostasis such as neurofilament L, alpha-tubulin, glial fibrillary acidic protein, ubiquinol-cytochrome c reductase complex protein I, and the beta chain of ATP synthase. These data support an important role for lipid peroxidation-derived protein modifications in Alzheimer disease pathogenesis.
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Affiliation(s)
- Reinald Pamplona
- Metabolic Pathophysiology Research Group, Departament de Ciències Mèdiques Bàsiques, Facultat de Medicina i Ciències de la Salut, Universitat de Lleida, c/Montserrat Roig,2. E-25008 Lleida, Spain
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Jørgensen CS, Jagd M, Sørensen BK, McGuire J, Barkholt V, Højrup P, Houen G. Efficacy and compatibility with mass spectrometry of methods for elution of proteins from sodium dodecyl sulfate–polyacrylamide gels and polyvinyldifluoride membranes. Anal Biochem 2004; 330:87-97. [PMID: 15183766 DOI: 10.1016/j.ab.2004.03.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2003] [Indexed: 11/16/2022]
Abstract
The resolving power of sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) combined with isoelectric focusing in two-dimensional gel electrophoresis has made it one of the most important techniques for resolving complex mixtures, and it is of great importance for proteome mapping projects. As a result of this, methods for postelectrophoretic protein characterization are of great interest as exemplified by in situ protease digestion combined with mass spectrometry (MS), which is the method of choice for identification of proteins. In this study we have developed and compared methods for recovering intact proteins from polyacrylamide gels and electroblotting membranes to define efficient methods compatible with MS. These methods complement in situ digestion protocols and allow determination of the molecular mass of whole proteins separated by SDS-PAGE. Passive elution of proteins from SDS-PAGE gels was efficient only in the presence of SDS, whereas electroelution was achieved using buffers without SDS. Surface-enhanced laser desorption/ionization MS (SELDI-MS) analysis of proteins eluted in the presence of SDS was possible using ion exchange ProteinChip arrays for concentration of sample and removal of SDS. Comparison of different electroblotting methods verified that the different membranes and buffers were equally efficient for transfer of proteins in the range 20-100 kDa. Elution from polyvinyldifluoride membranes was most efficient using either concentrated solutions of trifluoroacetic acid (TFA) or combinations of 8M urea and 1% Triton X-100, 1% Tween 20, or 40% isopropanol. The same result was obtained using nitrocellulose membranes, except that these were incompatible with organic solvent and TFA. Elution by TFA was compatible with matrix-assisted laser desorption/ionization MS (MALDI-MS) but was complicated by a high degree of trifluoroacetylation of the proteins. Alternatively, elution by 8M urea+1% Triton X-100, 1% Tween 20, or 40% isopropanol was compatible with both SELDI-MS and MALDI-MS. Eluted proteins were identified in MS experiments by intact mass determination, by peptide mapping, and by MS/MS analysis.
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Steinø A, Jørgensen CS, Laursen I, Houen G. Interaction of C1q with the receptor calreticulin requires a conformational change in C1q. Scand J Immunol 2004; 59:485-95. [PMID: 15140059 DOI: 10.1111/j.0300-9475.2004.01425.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The interaction between C1q and the chaperone calreticulin was studied under various conditions. When both proteins were present in equal amounts in solution, no interaction could be demonstrated. However, C1q immobilized on a hydrophobic surface, exposed to heat-treatment or bound to immunoglobulins (Igs) showed a strong, rapid and specific binding of calreticulin. The interaction appeared to be a two-step process, and the initial phase of interaction was sensitive to high concentrations of salt but not to a physiological salt concentration. The following strong binding was insensitive to salt and extremes of pH but sensitive to strongly denaturing agents (urea and guanidine). The sensitivity to salt during the initial phase of interaction was practically identical to that observed when calreticulin was bound to type V collagen. Binding between C1q and calreticulin could be inhibited by serum amyloid P component and by proteinase K-digested ovalbumin, and the binding of calreticulin to proteinase K-digested ovalbumin was shown to be inhibited by C1q. The data indicate that C1q binds stably to the peptide-binding site of calreticulin and that the initial binding of calreticulin to C1q involves the collagen-like domain of the C1q molecule. In conclusion, our results suggest calreticulin as a potential receptor for an altered conformation of C1q as occurs during binding to Igs. Thus, the chaperone and protein-scavenging function of calreticulin may extend from the endoplasmic reticulum to the topologically equivalent cell surface, where it may contribute to the elimination of immune complexes and apoptotic cells.
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Affiliation(s)
- A Steinø
- Department of Research and Development, Statens Serum Institut, Copenhagen, Denmark
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Gotoh Y, Kanno T, Fujimori Y, Ohkoshi Y, Nagura M, Akamatsu K, Deki S. Introduction of Ag and Ag2S Nanoparticles into Nylon 6 Film and Fiber. Polym J 2003. [DOI: 10.1295/polymj.35.960] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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