…At this time, the rod-shaped part forms the axis of the filament, and the head protrudes outward to form a bridge. The bridges protrude along the myosin filament at 143 Å intervals, offset by 120 degrees, and each one faces the actin filament (called the I filament) around the myosin filament. The head of the myosin molecule has ATPase activity, and it is thought that muscle contraction occurs when the cross-links of the myosin filament react with the actin filament while breaking down ATP. … *Some of the terminology that mentions "I filament" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このとき,棒状の部分はフィラメントの軸を形成し,頭部は外に突き出して架橋となる。架橋はミオシンフィラメントにそって143Åおきに120度ずつずれて突出しており,それぞれミオシンフィラメントのまわりのアクチンフィラメント(これをIフィラメントという)と向き合っている。ミオシン分子の頭部はATPアーゼ活性をもち,筋肉の収縮はミオシンフィラメントの架橋がATPを分解しながらアクチンフィラメントと反応することによりおこると考えられる。… ※「I フィラメント」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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