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キネシンは8nmのステップごとに1つのATPを水解する

M J Schnitzer1, S M Block

  • 1Department of Physics, Princeton University, New Jersey 08544, USA. schnitzr@princeton.edu

Nature
|July 24, 1997
PubMed
まとめ

キネシンモータータンパク質は,マイクロチューブルに沿った8nmのステップごとに1つのATP分子を消費します. この研究では,キネシンのATP/ステップ比を決定し,運動中のエネルギー消費を明らかにしました.

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Hydrolysis of ATP01:08

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If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
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Hydrolysis of ATP01:08

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The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids.
If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
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ATP Energy Storage and Release01:31

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ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
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