...In organisms that are fixed to the flagellar chamber, such as the choanocytes of marine sponges, flagellar movement creates water currents that are useful for feeding and respiration. The basic mechanism of flagellar movement was initially thought to be the successive contraction of microtubules, but the sliding hypothesis has now been established, which states that the arms of dynein (a protein with ATPase activity) attached to a doublet microtubule made of tubulin periodically attach to adjacent doublet microtubules, causing a positional shift using ATP energy. The mechanism by which local sliding is converted into bending is not yet fully understood. ... *Some of the terminology that mentions "dynein" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…海綿動物の襟細胞のように鞭毛室に固定しているものでは,鞭毛運動によって水流がおこり摂食や呼吸に役だっている。鞭毛運動の基本的しくみについては,最初微小管が次々に収縮することによると考えられたが,現在ではチューブリンよりなるダブレット微小管に並んでついているダイニンdynein(ATPアーゼ活性をもつタンパク質)の腕が,隣のダブレット微小管に周期的に付着し,ATPのエネルギーを使って位置的なずれを起こすとする滑り説が定着している。局所的滑りが屈曲に変わるしくみはまだよくわかっていない。… ※「dynein」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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