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Abhyankar WR, Wen J, Swarge BN, Tu Z, de Boer R, Smelt JPPM, de Koning LJ, Manders E, de Koster CG, Brul S. Proteomics and microscopy tools for the study of antimicrobial resistance and germination mechanisms of bacterial spores. Food Microbiol 2018; 81:89-96. [PMID: 30910091 DOI: 10.1016/j.fm.2018.03.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 02/21/2018] [Accepted: 03/13/2018] [Indexed: 10/17/2022]
Abstract
Bacterial spores are ubiquitous in nature and can withstand both chemical and physical stresses. Spores can survive food preservation processes and upon outgrowth cause food spoilage as well as safety risks. The heterogeneous germination and outgrowth behavior of isogenic spore populations exacerbates this risk. A major unknown factor of spores is likely to be the inherently heterogeneous spore protein composition. The proteomics methods discussed here help in broadening the knowledge about spore structure and identification of putative target proteins from spores of different spore formers. Approaches to synchronize Bacillus subtilis spore formation, and to analyze spore proteins as well as the physiology of spore germination and outgrowth are also discussed. Live-imaging and fluorescence microscopy techniques discussed here allow analysis, at single cell level, of the 'germinosome', the process of spore germination itself, spore outgrowth and the spore intracellular pH dynamics. For the latter, a recently published improved pHluorin (IpHluorin) under control of the ptsG promoter is applicable. While the data obtained from such tools offers novel insight in the mechanisms of bacterial spore awakening, it may also be used to probe candidate antimicrobial compounds for inhibitory effects on spore germination and strengthen microbial risk assessment.
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Affiliation(s)
- W R Abhyankar
- Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands; Department of Mass Spectrometry of Bio-macromolecules, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - J Wen
- Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands; Van Leeuwenhoek Centre for Advanced Microscopy, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - B N Swarge
- Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands; Department of Mass Spectrometry of Bio-macromolecules, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Z Tu
- Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands; Department of Mass Spectrometry of Bio-macromolecules, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - R de Boer
- Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - J P P M Smelt
- Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - L J de Koning
- Department of Mass Spectrometry of Bio-macromolecules, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - E Manders
- Van Leeuwenhoek Centre for Advanced Microscopy, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - C G de Koster
- Department of Mass Spectrometry of Bio-macromolecules, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - S Brul
- Department of Molecular Biology and Microbial Food Safety, Swammerdam Institute for Life Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
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2
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van Rooij GJ, Duursma MC, de Koster CG, Heeren RM, Boon JJ, Schuyl PJ, van der Hage ER. Determination of Block Length Distributions of Poly(oxypropylene) and Poly(oxyethylene) Block Copolymers by MALDI-FTICR Mass Spectrometry. Anal Chem 2012; 70:843-50. [PMID: 21644616 DOI: 10.1021/ac970609r] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Matrix-assisted laser desorption/ionization (MALDI) was performed on an external ion source Fourier transform ion cyclotron resonance mass spectrometer (FTICR-MS) to analyze the block length distributions of triblock polymers of poly(oxypropylene) and poly(oxyethylene). The first series of results presented demonstrate that the apparent molecular weight distributions are distorted. This distortion is induced by the flight-time-induced mass discrimination inherent in the experimental technique, the variation of isotopic patterns over the measured mass range, and the overlap of peaks in the spectrum. Subsequently, a method for the treatment of molecular weight distributions measured by MALDI on an external ion source FTICR-MS is developed to yield the actual molecular weight distribution and, from that, the individual block length distributions. For the first time, detailed and accurate molecular weight data were obtained on a complex sample using this methodology, which independently validates the data provided by the manufacturer. The experimentally verified random coupling hypothesis proves the validity of the methodology.
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Affiliation(s)
- G J van Rooij
- FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
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3
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Bekker M, Kramer G, Hartog AF, Wagner MJ, de Koster CG, Hellingwerf KJ, Teixeira de Mattos MJ. Changes in the redox state and composition of the quinone pool of Escherichia coli during aerobic batch-culture growth. Microbiology (Reading) 2007; 153:1974-1980. [PMID: 17526854 DOI: 10.1099/mic.0.2007/006098-0] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Ubiquinones (UQs) and menaquinones (MKs) perform distinct functions in Escherichia coli. Whereas, in general, UQs are primarily involved in aerobic respiration, the MKs serve as electron carriers in anaerobic respiration. Both UQs and MKs can accept electrons from various dehydrogenases, and may donate electrons to different oxidases. Hence, they play a role in maintaining metabolic flexibility in E. coli whenever this organism has to adapt to conditions with changing redox characteristics, such as oxygen availability. Here, the authors report on the changes in both the size and the redox state of the quinone pool when the environment changes from being well aerated to one with low oxygen availability. It is shown that such transitions are accompanied by a rapid increase in the demethylmenaquinone pool, and a slow increase in the MK pool. Moreover, in exponentially growing cultures in a well-shaken Erlenmeyer flask, it is observed that the assumption of a pseudo-steady state does not hold with respect to the redox state of the quinone pool.
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Affiliation(s)
- M Bekker
- Molecular Microbial Physiology Group, Swammerdam Institute for Life Sciences, BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - G Kramer
- Biological Mass-Spectrometry Group, Swammerdam Institute for Life Sciences, BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - A F Hartog
- Biomolecular Synthesis Group, Van't Hoff Institute for Molecular Sciences, Nieuwe Achtergracht 129, 1018 WS Amsterdam, The Netherlands
| | - M J Wagner
- Molecular Cell Physiology Group, Institute of Molecular Cell Biology, Vrije Universiteit, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands
| | - C G de Koster
- Biological Mass-Spectrometry Group, Swammerdam Institute for Life Sciences, BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - K J Hellingwerf
- Molecular Microbial Physiology Group, Swammerdam Institute for Life Sciences, BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
| | - M J Teixeira de Mattos
- Molecular Microbial Physiology Group, Swammerdam Institute for Life Sciences, BioCentrum, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
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Peters R, Litvinov VM, Steeman P, Dias AA, Mengerink Y, van Benthem R, de Koster CG, van der Wal S, Schoenmakers P. Characterisation of UV-cured acrylate networks by means of hydrolysis followed by aqueous size-exclusion combined with reversed-phase chromatography. J Chromatogr A 2006; 1156:111-23. [PMID: 17113590 DOI: 10.1016/j.chroma.2006.10.071] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2006] [Revised: 10/23/2006] [Accepted: 10/30/2006] [Indexed: 11/19/2022]
Abstract
UV-cured networks prepared from mixtures of di-functional (polyethylene-glycol di-acrylate) and mono-functional (2-ethylhexyl acrylate) acrylates were analysed after hydrolysis, by aqueous size-exclusion chromatography coupled to on-line reversed-phase liquid-chromatography. The mean network density and the fraction of dangling chain ends of these networks were varied by changing the concentration of mono-functional acrylate. The amount and the molar-mass distribution of the polyethylene-glycol chains between cross-links (M(XL)) and polyacrylic acid (PAA) backbone chains (the so-called kinetic chain length (kcl)) in the different acrylate networks were determined quantitatively. The molar-mass distribution of kcl revealed an almost linear dependence on the concentration of mono-functional acrylate. Analysis of the starting materials showed a significant concentration of mono-functional polyethylene-glycol acrylate. In combination with the analysis of the extractables of the UV-cured networks (polymers not attached to the network, impurities that originate from the photo-initiator and unreacted monomers), more insight in the total network structure was obtained. It was shown that the UV-cured networks contain only small fractions of residual compounds. With these results, the chemical network structure for the different UV-cured acrylate polymers was expressed in network parameters such as the number of PAA units which are cross-linked, the degree of cross-linking, and the network density, which is the molar concentration of effective network chains between cross-links per volume of the polymers. The mean molar mass of chains between chemical network junctions (M(C)) was calculated and compared with results obtained from solid-state NMR and DMA. The mean molar mass of chains between network junctions as determined by these methods was similar.
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Affiliation(s)
- R Peters
- DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands.
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Ehlers AW, de Koster CG, Meier RJ, Lammertsma K. MALDI-TOF-MS of Saturated Polyolefins by Coordination of Metal Cations: A Theoretical Study. J Phys Chem A 2001. [DOI: 10.1021/jp010627j] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. W. Ehlers
- Department of Chemistry, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands and DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands
| | - C. G. de Koster
- Department of Chemistry, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands and DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands
| | - Robert J. Meier
- Department of Chemistry, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands and DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands
| | - K. Lammertsma
- Department of Chemistry, Faculty of Sciences, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands and DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands
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Muscat D, Henderickx H, Kwakkenbos G, van Benthem R, de Koster CG, Fokkens R, Nibbering NM. In-source decay of hyperbranched polyesteramides in matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. J Am Soc Mass Spectrom 2000; 11:218-227. [PMID: 10697817 DOI: 10.1016/s1044-0305(99)00141-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Hyperbranched polyesteramides (DA2), prepared from hexahydrophthalic anhydride (D) and diisopropanolamine (A) have been characterized, by use of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS), field desorption (FD)-MS, and electrospray ionization (ESI)-MS. MALDI of polyesteramides produces protonated molecules. The spectra show a complex chemical composition distribution and end-group distribution which are mainly composed of two series of homologous oligomers DnA(n)+1 - mH2O and DnA(n) - mH2O, where m = 1-2. Signals from protonated molecules DnAn+1 and DnAn are almost absent in the MALDI spectrum, whereas these ions are responsible for the base peak of DnA(n)+1 - mH2O and DnA(n) - mH2O (m = 1-2) clusters in the ESI spectrum. The absence of -OH end-groups signals in the MALDI spectrum is due to a metastable decay of protonated DnA(n)+1 and DnAn ions in the ion source of the MALDI mass spectrometer prior to ion extraction. In-source decay results in the formation of protonated lower DnA(n)+1 - mH2O and DnA(n) - mH2O oligomers and their corresponding neutrals, leading to wrong conclusions concerning the relative end-group distribution as a function of the degree of polymerization and the chemical composition.
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Affiliation(s)
- D Muscat
- DSM Research, Geleen, The Netherlands
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7
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van der Hage ERE, Duursma MC, Heeren RMA, Boon JJ, Nielen MWF, Weber AJM, de Koster CG, de Vries NK. Structural Analysis of Polyoxyalkyleneamines by Matrix-Assisted Laser Desorption/Ionization on an External Ion Source FT-ICR-MS and NMR. Macromolecules 1997. [DOI: 10.1021/ma9618383] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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van Rooij GJ, Duursma MC, Heeren RMA, Boon JJ, de Koster CG. High resolution end group determination of low molecular weight polymers by matrix-assisted laser desorption ionization on an external ion source fourier transform ion cyclotron resonance mass spectrometer. J Am Soc Mass Spectrom 1996; 7:449-57. [PMID: 24203399 DOI: 10.1016/1044-0305(96)00003-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/1995] [Revised: 12/19/1995] [Accepted: 12/19/1995] [Indexed: 05/14/2023]
Affiliation(s)
- G. J. van Rooij
- Unit for Macromolecular Mass Spectrometry, FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands
| | - M. C. Duursma
- Unit for Macromolecular Mass Spectrometry, FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands
| | - R. M. A. Heeren
- Unit for Macromolecular Mass Spectrometry, FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands
| | - J. J. Boon
- Unit for Macromolecular Mass Spectrometry, FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands
| | - C. G. de Koster
- Unit for Macromolecular Mass Spectrometry, FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands
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Abstract
The collision-induced dissociation (CID) spectra of the [M+H]+ ions of a pentapeptide and the corresponding peptoid and retropeptoid have been compared. The spectra of the peptide and peptoid both exhibit B- and Y"-type sequence ions at identical m/z values. In contrast to the peptide, the [M+H]+ ion of the peptoid and all sequence ions containing an N-substituted glycine derivative corresponding to a tyrosine amino acid residue can easily lose a C7H6O molecule in a charge-remote fragmentation process. The presence of N-substituted glycine residues in a peptoid is further apparent from the presence of N-substituted immonium ions, which differ significantly in their fragmentation behaviour from the corresponding immonium ions observed in the spectra of common oligopeptides. Loss of the CH2 = NH imine molecule is the dominant fragmentation reaction in the CID spectra of all peptoid immonium ions investigated in this study. The elimination of the CH = NH2 ylide analogue from common peptide immonium ions is energetically less favourable as shown by ab initio calculations. The relative heat of formation of the CH = NH2 ylide neutral appeared to be 168 kJ mol-1 more than that of the CH2 = NH imine molecule.
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Affiliation(s)
- W Heerma
- University of Utrecht, Bijvoet Center for Biomolecular Research, Netherlands
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de Koster CG, Heerma W, Pepermans HA, Groenewegen A, Peters H, Haverkamp J. Tandem mass spectrometry and nuclear magnetic resonance spectroscopy studies of Candida bombicola sophorolipids and product formed on hydrolysis by cutinase. Anal Biochem 1995; 230:135-48. [PMID: 8585609 DOI: 10.1006/abio.1995.1448] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Natural mixtures of sophorolipids produced by the yeast Candida bombicola have been analyzed by fast atom bombardment (FAB)-MS and collision-induced dissociation (CID)-MS. Some pure components have been analysed by two-dimensional NMR spectroscopy. The presence of acidic, lactonic, and O-acetylated forms and the position of double bonds in the fatty acid part of these glycolipids can be easily inferred from positive and negative ion FAB-mass spectra. Details about position of O-acetylation can be obtained from CID mass spectra of [M+H]+ and [M-H]- ions and from the NMR spectra. Differences in CID fragmentation between protonated and sodiated molecular ions are discussed in detail. Enzymatic hydrolysis of 6',6"-di-O-acetyl sophorolipid lactone by cutinase from Fusarium solani results specifically in the removal of the 6'-O-acetyl group, whereas the 6"-O-acetyl and lactone group are resistant. This specificity is explained from a three-dimensional model of the sophorolipid generated on the basis of the short 1H,1H distances as inferred from the NMR (ROESY) spectra.
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Affiliation(s)
- C G de Koster
- Bijvoet Center for Biomolecular Research, Mass Spectrometry Group, University of Utrecht, The Netherlands
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de Koster CG, Duursma MC, van Rooij GJ, Heeren RM, Boon JJ. Endgroup analysis of polyethylene glycol polymers by matrix-assisted laser desorption/ionization Fourier-transform ion cyclotron resonance mass spectrometry. Rapid Commun Mass Spectrom 1995; 9:957-62. [PMID: 7670157 DOI: 10.1002/rcm.1290091018] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Fourier-transform ion cyclotron resonance mass spectrometry (FTICR-MS) by external injection of matrix-assisted laser desorbed and ionized (MALDI) polymers offers good possibilities for characterization of low molecular weight homopolymers (MW range up to 10 kDa). The molecular masses of the molecular weight distribution (MWD) components of underivatized and derivatized (dimethyl, dipropyl, dibutyl and diacetyl) polyethylene glycol (PEG) 1000 and 4000 were measured by MALDI-FTICR-MS. These measurements have been performed using a commercial FTICR spectrometer with a home-built external ion source. MALDI of the samples with a 2,5-dihydroxybenzoic acid matrix in a 1000:1 matrix-to-analyte molar ratio produces sodiated molecules in a sufficient yield to trap the ions in the ICR cell. The masses of the molecular weight distribution of PEG components were measured in broad-band mode with a mass accuracy of < 5 ppm in the mass range around 1000 u and within 40 ppm accuracy around 4000 u. From these measurements, the endgroup mass of the polymer was determined by correlation of the measured component mass with the degree of polymerization. The masses of the PEG endgroups have been determined within a deviation of 3-10 millimass units for the PEG1000 derivatives and 10-100 millimass units for the PEG4000 derivatives, thus confirming the identity of the distal parts of the model compounds.
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Affiliation(s)
- C G de Koster
- Unit for Macromolecular Mass Spectrometry, FOM Institute for Atomic and Molecular Physics, Amsterdam, The Netherlands
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Kováčik V, Hirsch J, Heerma W, de Koster CG, Haverkamp J. Fast atom bombardment mass and tandem mass spectra of protonated and alkali cationized aldobiouronic and pseudoaldobiouronic acid per-O-methyl derivatives. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/oms.1210291203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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de Koster CG, Vos B, Versluis C, Heerma W, Haverkamp J. High-performance thin-layer chromatography/fast atom bombardment (tandem) mass spectrometry of Pseudomonas rhamnolipids. Biol Mass Spectrom 1994; 23:179-85. [PMID: 8172926 DOI: 10.1002/bms.1200230402] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Several rhamnolipid preparations from Pseudomonas strains were studied by thin-layer chromatography/fast atom bombardment (TLC/FAB) mass spectrometry and TLC/FAB tandem mass spectrometry (MS/MS). The preparations were separated with normal-phase (Silica 60) and reversed-phase (RP-8) chromatography. Silica 60 plates appeared to be very useful in the separation of rhamnolipids according to the number of monosaccharide residues present. Spectra which show characteristic fragment ions could be obtained from components of mixtures with a total sample size of less than 200 ng. Chromatography on RP-8 plates gave a good separation of the rhamnolipids based on the length of the fatty acid alkyl chain. MS/MS of the sodium cationized molecules gave information about the sequence of the building blocks. Particularly, heterogeneity in beta-hydroxy fatty acid composition was determined for the principal as well as minor components present in natural rhamnolipid mixtures.
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Affiliation(s)
- C G de Koster
- Bijvoet Center for Biomolecular Research, Mass Spectrometry, Utrecht University, The Netherlands
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van Dongen WD, Versluis C, van Wassenaar PD, de Koster CG, Heerma W, Haverkamp J. Rapid analysis of enzymatic digests of a bacterial protease of the subtilisin type and a "bio-engineered" variant by high-performance liquid chromatography-frit fast atom bombardment mass spectrometry. J Chromatogr A 1993; 647:301-9. [PMID: 8227269 DOI: 10.1016/0021-9673(93)83410-t] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Amino acid sequencing of a subtilisin-type bacterial protease and a bio-engineered variant was carried out by investigating various enzymatic digests using HPLC-frit fast atom bombardment MS methods. The fast atom bombardment mass spectral data allowed rapid identification of the enzymatically generated peptides and differentiation between both proteins. The feasibility of determining the positions and nature of mutations in the amino acid sequence depends mainly on the size of the peptides containing the modifications.
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Affiliation(s)
- W D van Dongen
- Bijvoet Centre for Biomolecular Research, Department of Mass Spectrometry, Utrecht University, Netherlands
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de Koster CG, Pajarron AM, Heerma W, Haverkamp J. Fast atom bombardment mass spectrometry of sucrose monocaprate and sucrose monolaurate. Biol Mass Spectrom 1993; 22:277-84. [PMID: 8507673 DOI: 10.1002/bms.1200220503] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Fast Atom Bombardment (FAB) ionization of sucrose monocaprate and sucrose monolaurate in the presence of Na+ ions shows the formation of both [M+Na]+ and [M - H]- ions. The [M+Na]+ ions undergo charge-remote fragmentations when collisionally activated at high translational energy. These charge-remote fragmentations are useful for the structural determination of the acyclic part of the glycolipid. In the negative ion mode both sucrose esters yield anions which can be attributed to the saccharide and lipid components of these glycolipids. Structural characterization of the fatty acid can be achieved as the released carboxylate anions undergo charge-remote fragmentations that are consistent with the ion chemistry of [M - H]- anions from FAB-ionized free fatty acids.
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Affiliation(s)
- C G de Koster
- Bijvoet Center for Biomolecular Research, Department of Mass Spectrometry, University of Utrecht, The Netherlands
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17
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Abstract
The mechanism for the formation of C"-type ions from protonated peptides, produced under conditions of fast-atom bombardment and collisional activation was investigated. Comparison of the tandem mass spectra of the [M + H]+ ions of a model peptide and the corresponding [Md + D]+ ions, in which all exchangeable hydrogens are replaced with deuterium, revealed that neither the carboxylic hydrogen nor a hydrogen from a nitrogen atom is involved in the process of migration of a hydrogen which leads to the formation of C"n-type ions. The most feasible position from which the transferred hydrogen originates is that at the first C-atom in the side-chain of the adjacent amino acid.
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Affiliation(s)
- W D van Dongen
- University of Utrecht, Faculty of Chemistry, Bijvoet Center for Biomolecular Research, The Netherlands
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18
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