Simultaneous sequence analysis of amino- and carboxy- termini

G - Physics – 01 – N

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G01N 33/68 (2006.01)

Patent

CA 2582578

The present invention relates to a new method for identifying polypeptides by deducing the amino acid sequence of the carboxy and amino termini by a mass spectrometer analysis. The method comprises the steps of dissociating highly charged peptide precursor ions (e.g., z > 4) using electron transfer dissociation inducing anions followed by removal of those reagents and introduction of a second, proton transfer inducing anion type. The second PTR reaction duration is adjusted to convert the ETD products to primarily the + 1 charge-state to reduce the highly charged c and z-type fragments, producing an m/z spectrum containing a series of c and z-type fragment ions that are easily interpreted to reveal the sequence of the amino and carboxy terminus, respectively.

La présente invention concerne une nouvelle méthode permettant d'identifier des polypeptides par déduction de la séquence d'acides aminés des terminaisons carboxy et amino par une analyse par spectrométrie de masse. Cette méthode consiste à dissocier des ions précurseurs peptidiques fortement chargés (z>4, par exemple) à l'aide d'anions induisant une dissociation par transfert d'électrons, puis à retirer ces réactifs et à introduire un second type d'anion induisant un transfert de protons. La durée de la seconde réaction de transfert de protons est ajustée de façon à convertir les produits de la dissociation par transfert d'électrons principalement à l'état de charge +1 et ainsi réduire les fragments de type z et c fortement chargés. Ces opérations permettent d'obtenir un spectre m/z contenant une série d'ions fragments de type z et c que l'on peut facilement interpréter pour identifier la séquence des terminaisons amino et carboxy, respectivement.

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