Posttranslational modifications are of great interest because of their relevance in biological systems as proteins are commonly activated or deactivated by phosphorylation, glycation and acetylation [1, 2]. During eye lens aging the number of the alphaA-crystallin isoproteins increases. This could be observed by the use of 2D-PAGE (two-dimensional gel electrophoresis). The number of alphaA-crystallin spots in the gel increased during eye lens aging. For further analysis the spots of 2D-PAGE were cut out and the identification of the proteins was done using nanoLC-ESI-MS/MS (liquid chromatography electrospray ionization tandem mass spectrometry). The created MS/MS-data were analyzed using the Sequest algorithm. Searches with different parameters were done to preferably get the complete sequence coverage and to identify posttranslational modifications of the alphaA-crystallin. The acetylated N-terminus of this protein could be detected. Furthermore, phosphorylation of serine 122 and 148 was identified in two different spots.
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