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Intermediate complex of ATP hydrolysis and synthesis by muscle proteins

✍ Scribed by Hotta, K.

Publisher
Wiley (John Wiley & Sons)
Year
1975
Tongue
English
Weight
240 KB
Volume
3
Category
Article
ISSN
0091-7419

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✦ Synopsis

Abstract

Myosin catalyzed exchange between ^32^P~i~ and ATP in reaction medium during its enzymatic hydrolysis of ATP only by a very small amount. Addition of actin increased to a great extent the rate of incorporation of ^32^P~i~ in the presence of Mg. Glycerinated smooth muscle fibers also exhibited the ability to exchange ^32^P~i~ and ATP upon the application of external force (repeated stretching and releasing). A schematic mechanism of the action of actin and external force on acceleration of ^32^P~i~ incorporation is proposed and the importance of the M*‐ADP complex for force generation is suggested.

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