Abstract

1. 1. Goldfish are able to adapt to different environmental temperatures by altering their contractile proteins. 2. 2. Fish acclimated to a low temperature produce myofibrils with a higher specific ATPase activity and thermostability than those in fish acclimated to a higher temperature. 3. 3. It has previously been demonstrated that the alterations of the specific activity are brought about b by alterations in the regulatory proteins. 4. 4. This work shows that the alterations in thermostability of the ATPase are also brought about by the regulatory proteins. 5. 5. It is proposed that these regulatory proteins play a more involved role in muscle contraction than a simple on/off switch.

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