Proteins from bioptates and autoptates of human skeletal muscle m. vastus lateralis were separated by O'Farrell two-dimensional gel electrophoresis (2DE). MALDI-TOF MS and MS/MS enabled identification of 89 protein spots as expression products of 55 genes. A modification of the O'Farrell's method including non-equilibrium electrophoresis in a pH gradient allowed detection--among major sarcomeric, mitochondrial, and cytosolic proteins--of several proteins, such as PDZ- and LIM domain-containing ones (pI > 8.70), fragments of known proteins, and a stable complex of heavy and light ferritin chains. The data underlie further studies of human skeletal muscle proteins in terms of molecular mechanisms of some physiological and pathological processes.
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