... 2035isomerization of aspartate residues [6]. Major targets of these alterations, also called Ôprotein molecular fatiguedamageÕ [7], are cytoskeletal components, such as ankyrin and bands 4.1 and 4.2, as ... fromL-asparaginyl deamidation and/ orL-aspartylisomerization reactions [7]. In addition it has been reportedthat isoaspartate residues, detected by the PCMT in situassay, increase in membrane ... proteins,catalysed by PCMT, is increased as erythrocytes age in thecirculation [6,25,26]. This has been related to an increasednumber of abnormal aspartate residues, spontaneouslyarising fromL-asparaginyl...