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    Identification of MHC class I associated peptides. Development of sensitive mass spectrometric sequence analysis techniques

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    Authors
    de Jong APJM
    van der Heeft E
    ten Hove GJ
    van Gaans-van den Brink JAM
    van Els CACM
    Type
    Report
    Language
    en
    
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    Title
    Identification of MHC class I associated peptides. Development of sensitive mass spectrometric sequence analysis techniques
    Translated Title
    Identificatie van MHC klasse I geassocieerde antigeenpeptiden. Ontwikkeling van gevoelige massaspectrometrische sequentie analysetechnieken
    Publiekssamenvatting
    Betreft de ontwikkeling van gevoelige microkolom HPLC-ESI/MS methoden en technieken voor de analyse van MHC klasse I geassocieerde antigeenpeptiden. De analyse bestaat uit de identificatie van T-cel stimulerende peptiden in MHC elutiemengsels van geinfecteerde celkweekculturen gevolgd door de bepaling van de aminozuurvolgorde (sequentie) van deze peptiden. Elutiemengsels van MHC moleculen kunnen zeer grote aantallen (tot 2000) verschillende peptiden bevatten met sterk wisselende samenstelling afhankelijk van te onderzoeken cellijnen of weefselmateriaal. Beschikbare hoeveelheden van individuele peptiden in dergelijke mengsels voor onderzoek liggen in de femtomol (10 exp. -10) tot picomol (10 exp. -12) range per miljard cellen. HPLC-ESI/MS wordt als de meest geschikte techniek beschouwd voor deze toepassing. In dit onderzoek is microkolom HPLC schakeltechniek ontwikkeld ; de condities zijn aangepast voor een optimale gevoeligheid in ESI-MS. De hiermee behaalde gevoeligheden liggen tussen 10 en 50 fmol voor identificatiedoeleinden (molecuulgewichtbepaling), afhankelijk van aard en soort peptide. Sequentie-analyses vergen circa tien keer grotere hoeveelheden (100-500 fmol/peptide). Dit komt overeen met de hoeveelheden antigeenpeptiden in middelgrote celkweken (10 exp. 10 cellen).<br>
    The development of methods and techniques for the sensitive analysis of MHC class I associated peptides has been described. Analysis concerns the identification and sequence determination of specific T-cel stimulating antigenic peptides in complex mixtures derived from cell cultures. Such mixtures comprise a few hundreds to thousand different class I peptides present at femtomol (10 exp. -15) to picomol (10 exp. -12) level per billion cells. Liquid chromatography-electrospray ionisation mass spectrometry has emerged as the most appropriate technique for such analysis. For this purpose, a micro-column switching technique has been developed; conditions were optimised directed to large volume sample introduction, concentration and separation for their sensitive analysis at suitable ESI conditions. The sensitivity of the method for molecular weight determination (identification) range between 10 and 50 fmol for individual peptides. Sequence analysis required a ten-fold higher amount of peptide, but is sufficiently low for application to amounts that can be made available from medium size cell cultures of typically 10 exp. 10 cells.<br>
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    Rijksinstituut voor Volksgezondheid en Milieu RIVM
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