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Myosin atpase

myosin atpase

(Science: enzyme) An enzyme that catalyses the hydrolysis of myosin aTP in the presence of actin to form myosin aDP and orthophosphate. This reaction is the immediate source of free energy that drives muscle contraction. In the absence of actin, myosin atpase activity is low and requires calcium ions.

Chemical name: Myosin ATP phosphohydrolase (actin-translocating)

Registry number: EC

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Re: Muscle Contractions

... sarcoplasmic reticulum to stimulate contraction (second messenger). The myosin fibers (on actin) are blocked by tropomyosin which is anchored by ... ATP "runs out". The Ca2+ is then pumped back into SR by Ca2+ ATPase (SERCA) and muscle relaxes. Hope it helps

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by Jpoley
Tue Mar 01, 2011 2:42 am
Forum: Human Biology
Topic: Muscle Contractions
Replies: 1
Views: 7826

Activation of myosin?

Could anyone help me to describe the activation of myosin? Is it when ATPase in the myosin head hydrolyzes ATP to ADP and P which provides energy needed to return myosin ...

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by Vangeek
Wed Feb 11, 2009 3:15 am
Forum: Cell Biology
Topic: Activation of myosin?
Replies: 2
Views: 4276

Can organisms feed with vibrations or thermal infrared?

... are reversible - the dominant direction depends of parameters (like ATPase H+). Myosin can change energy stored in ATP into movement. It's functions are too directed, too ...

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by Jarek
Tue Aug 12, 2008 4:29 pm
Forum: General Discussion
Topic: Can organisms feed with vibrations or thermal infrared?
Replies: 1
Views: 3070

The Fiber Disease

... actuator. Muscle cells are long and cylindrical and made of thick myosin filaments surrounded by thin actin filaments. A central myosin filament ... The hydrolysis of 1 mole of ATP releases about 10 kcal of energy. The ATPase was the first rotary motor enzyme to be ever found and the force generated ...

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by Nadas Moksha
Fri Oct 27, 2006 9:34 am
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 6245092

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