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Recent studies of the giant protein titin have shed light on its roles in muscle assembly and elasticity and include the surprising findings described here. We now know that the titin kinase domain, which has long been a puzzle, has a novel regulation mechanism. A substrate, telethonin, has been identified that is located over one micron away from the kinase domain in mature muscle. Single-molecule...
Individual molecules of the giant muscle proteins titin and nebulin span large distances in the sarcomere. Approximately one-third of the titin molecule forms elastic filaments linking the ends of thick filaments to the Z-line. The remainder of the molecule is probably bound to the thick filament where it may regulate assembly of myosin and the other thick filament proteins. This region also contains...
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