title: A two-segment model for thin filament architecture in skeletal muscle.
abstract: Correct specification of myofilament length is essential for efficient skeletal muscle contraction. The length of thin actin filaments can be explained by a novel 'two-segment' model, wherein the thin filaments consist of two concatenated segments, which are of either constant or variable length. This is in contrast to the classic 'nebulin ruler' model, which postulates that thin filaments are uniform structures, the lengths of which are dictated by nebulin. The two-segment model implicates position-specific microregulation of actin dynamics as a general principle underlying actin filament length and stability.
authors.affiliation: Department of Cell Biology, The Scripps Research Institute, La Jolla, California 92037, USA.
authors.forename: David S
authors.initials: DS
authors.lastname: Gokhin
authors.forename: Velia M
authors.initials: VM
authors.lastname: Fowler
mesh_terms: D008841:Actin Cytoskeleton / Q000737:chemistry* / Q000502:physiology*; D000818:Animals; D051347:CapZ Actin Capping Protein / Q000378:metabolism / Q000502:physiology; D006801:Humans; D008954:Models, Biological; D009119:Muscle Contraction / Q000502:physiology; D009124:Muscle Proteins / Q000378:metabolism / Q000502:physiology; D018482:Muscle, Skeletal / Q000378:metabolism / Q000502:physiology / Q000648:ultrastructure*; D009210:Myofibrils / Q000737:chemistry / Q000378:metabolism / Q000502:physiology / Q000648:ultrastructure; D017696:Myopathies, Nemaline / Q000235:genetics / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D012518:Sarcomeres / Q000378:metabolism / Q000502:physiology; D014335:Tropomyosin / Q000378:metabolism / Q000502:physiology
chemical_list: D051347:CapZ Actin Capping Protein; D009124:Muscle Proteins; D014335:Tropomyosin; C035620:nebulin