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Mechmeche M, Kachouri F, Ksontini H, Hamdi M. Production of bioactive peptides from tomato seed isolate by Lactobacillus plantarum fermentation and enhancement of antioxidant activity. FOOD BIOTECHNOL 2017. [DOI: 10.1080/08905436.2017.1302888] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Manel Mechmeche
- National Institute of Applied Sciences and Technology (INSAT), Laboratory of Microbial Ecology and Technology (LETMI), Tunis, Tunisia
- Superior School of Food Industry at Tunis (ESIAT), Tunis, Tunisia
| | - Faten Kachouri
- National Institute of Applied Sciences and Technology (INSAT), Laboratory of Microbial Ecology and Technology (LETMI), Tunis, Tunisia
- Superior School of Food Industry at Tunis (ESIAT), Tunis, Tunisia
| | - Hamida Ksontini
- National Institute of Applied Sciences and Technology (INSAT), Laboratory of Microbial Ecology and Technology (LETMI), Tunis, Tunisia
- Superior School of Food Industry at Tunis (ESIAT), Tunis, Tunisia
| | - Moktar Hamdi
- National Institute of Applied Sciences and Technology (INSAT), Laboratory of Microbial Ecology and Technology (LETMI), Tunis, Tunisia
- Superior School of Food Industry at Tunis (ESIAT), Tunis, Tunisia
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Mechmeche M, Kachouri F, Chouabi M, Ksontini H, Setti K, Hamdi M. Optimization of Extraction Parameters of Protein Isolate from Tomato Seed Using Response Surface Methodology. FOOD ANAL METHOD 2016. [DOI: 10.1007/s12161-016-0644-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Welch CJ, Sajonz P, Spencer G, Leonard W, Henderson D, Schafer W, Bernardoni F. Microscale HPLC Predicts Preparative Performance at Millionfold Scale. Org Process Res Dev 2008. [DOI: 10.1021/op800107u] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christopher J. Welch
- Separation Center of Excellence, Process Research, Merck & Co., Inc. Rahway, New Jersey 07065, U.S.A
| | - Peter Sajonz
- Separation Center of Excellence, Process Research, Merck & Co., Inc. Rahway, New Jersey 07065, U.S.A
| | - Glenn Spencer
- Separation Center of Excellence, Process Research, Merck & Co., Inc. Rahway, New Jersey 07065, U.S.A
| | - William Leonard
- Separation Center of Excellence, Process Research, Merck & Co., Inc. Rahway, New Jersey 07065, U.S.A
| | - Derek Henderson
- Separation Center of Excellence, Process Research, Merck & Co., Inc. Rahway, New Jersey 07065, U.S.A
| | - Wes Schafer
- Separation Center of Excellence, Process Research, Merck & Co., Inc. Rahway, New Jersey 07065, U.S.A
| | - Frank Bernardoni
- Separation Center of Excellence, Process Research, Merck & Co., Inc. Rahway, New Jersey 07065, U.S.A
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Nice EC, Rothacker J, Weinstock J, Lim L, Catimel B. Use of multidimensional separation protocols for the purification of trace components in complex biological samples for proteomics analysis. J Chromatogr A 2007; 1168:190-210; discussion 189. [PMID: 17597136 DOI: 10.1016/j.chroma.2007.06.015] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2007] [Revised: 06/06/2007] [Accepted: 06/07/2007] [Indexed: 01/09/2023]
Abstract
The routine detection of low abundance components in complex samples for detailed proteomics analysis continues to be a challenge. Whilst the potential of multidimensional chromatographic fractionation for this purpose has been proposed for some years, and was used effectively for the purification to homogeneity of trace components in bulk biological samples for N-terminal sequence analysis, its practical application in the proteomics arena is still limited. This article reviews some of the recent data using these approaches, including the use of microaffinity purification as part of multidimensional protocols for downstream proteomics analysis.
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Affiliation(s)
- E C Nice
- Protein Biosensing and Epithelial Laboratories, Ludwig Institute for Cancer Research, Melbourne Tumour Biology Branch, P.O. Royal Melbourne Hospital, Parkville, Vic. 3050, Australia.
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Alewood D, Nielsen K, Alewood PF, Craik DJ, Andrews P, Nerrie M, White S, Domagala T, Walker F, Rothacker J, Burgess AW, Nice EC. The role of disulfide bonds in the structure and function of murine epidermal growth factor (mEGF). Growth Factors 2005; 23:97-110. [PMID: 16019431 DOI: 10.1080/08977190500096061] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A systematic study using solid phase peptide synthesis has been undertaken to examine the role of the disulfide bonds in the structure and function of mEGF. A combination of one, two and three native disulfide pair analogues of an active truncated (4-48) form of mEGF have been synthesised by replacing specific cysteine residues with isosteric a-amino-n-butyric acid (Abu). Oxidation of the peptides was performed using either conventional aerobic oxidation at basic pH, in DMSO under acidic conditions or via selective disulfide formation using orthogonal protection of the cysteine pairs. The contribution of individual, or pairs of, disulfide bonds to EGF structure was evaluated by CD and (1)H-NMR spectroscopy. The mitogenic activity of each analogue was determined using Balb/c 3T3 mouse fibroblastsAs we have reported previously (Barnham et al. 1998), the disulfide bond between residues 6 and 20 can be removed with significant retention of biological activity (EC50 20-50 nM). The overall structure of this analogue was similar to that of native mEGF, indicating that the loss of the 6-20 disulfide bridge did not affect the global fold of the molecule. We now show that removal of any other disulfide bond, either singly or in pairs, results in a major disruption of the tertiary structure, and a large loss of activity (EC50>900 nM). Remarkably, the linear analogue appears to have greater activity (EC50 580 nM) than most one and two disulfide bond analogues although it does not have a definable tertiary structure.
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Affiliation(s)
- Dianne Alewood
- The Institute for Molecular Bioscience, The University of Queensland, Australia
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Kashirin DM, Sibilev AV, Deigin VI, Prokof'eva VI. HPLC in the pharmaceutical analysis of peptide-containing drugs. Pharm Chem J 2000. [DOI: 10.1007/bf02524587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
The use of instrumental biosensors in basic research to measure biomolecular interactions in real time is increasing exponentially. Applications include protein-protein, protein-peptide, DNA-protein, DNA-DNA, and lipid-protein interactions. Such techniques have been applied to, for example, antibody-antigen, receptor-ligand, signal transduction, and nuclear receptor studies. This review outlines the principles of two of the most commonly used instruments and highlights specific operating parameters that will assist in optimising experimental design, data generation, and analysis.
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Affiliation(s)
- E C Nice
- Ludwig Institute for Cancer Research, CRC for Cellular Growth Factors, P.O. Royal Melbourne Hospital, Victoria, Australia.
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Barnham KJ, Torres AM, Alewood D, Alewood PF, Domagala T, Nice EC, Norton RS. Role of the 6-20 disulfide bridge in the structure and activity of epidermal growth factor. Protein Sci 1998; 7:1738-49. [PMID: 10082370 PMCID: PMC2144085 DOI: 10.1002/pro.5560070808] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Two synthetic analogues of murine epidermal growth factor, [Abu6, 20] mEGF4-48 (where Abu denotes amino-butyric acid) and [G1, M3, K21, H40] mEGF1-48, have been investigated by NMR spectroscopy. [Abu6, 20] mEGF4-48 was designed to determine the contribution of the 6-20 disulfide bridge to the structure and function of mEGF. The overall structure of this analogue was similar to that of native mEGF, indicating that the loss of the 6-20 disulfide bridge did not affect the global fold of the molecule. Significant structural differences were observed near the N-terminus, however, with the direction of the polypeptide chain between residues four and nine being altered such that these residues were now located on the opposite face of the main beta-sheet from their position in native mEGF. Thermal denaturation experiments also showed that the structure of [Abu6, 20] mEGF4-48 was less stable than that of mEGF. Removal of this disulfide bridge resulted in a significant loss of both mitogenic activity in Balb/c 3T3 cells and receptor binding on A431 cells compared with native mEGF and mEGF4-48, implying that the structural changes in [Abu6, 20] mEGF4-48, although limited to the N-terminus, were sufficient to interfere with receptor binding. The loss of binding affinity probably arose mainly from steric interactions of the dislocated N-terminal region with part of the receptor binding surface of EGF. [G1, M3, K21, H40] mEGF1-48 was also synthesized in order to compare the synthetic polypeptide with the corresponding product of recombinant expression. Its mitogenic activity in Balb/c 3T3 cells was similar to that of native mEGF and analysis of its 1H chemical shifts suggested that its structure was also very similar to native.
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Affiliation(s)
- K J Barnham
- Biomolecular Research Institute, Parkville, Victoria, Australia
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Leonard M. New packing materials for protein chromatography. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1997; 699:3-27. [PMID: 9392365 DOI: 10.1016/s0378-4347(97)00160-6] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This review describes new packing materials designed for protein chromatography, covering advances in base supports and stationary phases. Base supports are classified according to their chemical composition. Since most separation media are bead shaped, typical procedures used for their preparation are also presented. In order to provide matrices combining improved chemical stability and chromatographic performances, composite materials continue to be developed, including bonded stationary phases, pore composites and mixed carriers. The different approaches to their preparation are described and characteristics that play a major role in the chromatographic process are discussed. Recently introduced materials and some of their applications under non-denaturing conditions in the different chromatographic modes are also presented.
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Affiliation(s)
- M Leonard
- Laboratoire de Chimie-Physique Macromoléculaire, URA CNRS 494, Ecole Nationale Supérieure des Industries Chimiques, Nancy, France
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Malmqvist M, Karlsson R. Biomolecular interaction analysis: affinity biosensor technologies for functional analysis of proteins. Curr Opin Chem Biol 1997; 1:378-83. [PMID: 9667873 DOI: 10.1016/s1367-5931(97)80077-4] [Citation(s) in RCA: 105] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The introduction of affinity-based biosensors has permitted label-free functional analysis of biomolecular interactions in real time. A variety of methods are now based on BIACORE and IAsys technology and have mainly been used to determine kinetics and affinity constants.
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Affiliation(s)
- M Malmqvist
- Biacore AB Rapsgatan 7, S-754 50, Uppsala, Sweden.
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Catimel B, Nerrie M, Lee FT, Scott AM, Ritter G, Welt S, Old LJ, Burgess AW, Nice EC. Kinetic analysis of the interaction between the monoclonal antibody A33 and its colonic epithelial antigen by the use of an optical biosensor. A comparison of immobilisation strategies. J Chromatogr A 1997; 776:15-30. [PMID: 9286074 DOI: 10.1016/s0021-9673(97)00087-3] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The interaction between the humanised A33 monoclonal antibody and the corresponding F(ab)'2 or Fab' fragments with the colonic epithelial A33 antigen, purified by micropreparative HPLC from membrane extracts of the colonic carcinoma cell line LIM 1215, has been studied with the BIAcore 2000 biosensor using surface plasmon resonance detection. The surface orientation of immobilised antibody and the Fab' fragment onto the biosensor surface was controlled using alternative immobilisation chemistries. This resulted in significantly higher molar binding activities compared with the conventional N-hydroxysuccinimide (NHS)/N-ethyl-N'-dimethylaminopropylcarbodiimide (EDC) chemistry. This increase in signal resulted in a concomitant increase in sensitivity of detection, which facilitates analysis of low levels of A33 antigen. The apparent association rate (ka) and dissociation rate (kd) constants obtained with the different immobilisation chemistries were determined. These analyses showed that the kinetic constants obtained for the IgG were not significantly affected by the method of immobilisation. F(ab)'2 and Fab' fragments immobilised using NHS/EDC chemistry showed significantly lower apparent affinity. By contrast the use of the thiol coupling chemistry with the Fab' fragment gave a five fold increase in observed KA, resulting in a similar affinity to that observed with the intact IgG molecule.
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Affiliation(s)
- B Catimel
- Ludwig Institute for Cancer Research. PO Royal Melbourne Hospital, Parkville, Victoria, Australia
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Nice E, Catimel B, Lackmann M, Stacker S, Runting A, Wilks A, Nicola N, Burgess A. Strategies for the identification and purification of ligands for orphan biomolecules. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/bf02443522] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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