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Molecular forms of purified human erythrocyte membrane acetylcholinesterase investigated by crosslinking with diimidates.

Several molecular forms of human erythrocyte membrane acetylcholinesterase have been studied after crosslinking with bifunctional diimidates. The crosslinked products were analysed by centrifugation on linear sucrose density gradients containing Triton X-100. Molecular weights of covalently linked oligomers were estimated by sodium dodecylsulfate gel electrophoresis. It was shown that acetylcholinesterase crosslinked in absence of Triton X-100 consists of molecular forms built up by dimeric protomers. These dimers were identical with the enzymatically active species sedimenting with 6.5S in linear sucrose density gradients.