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Troponin c



The polypeptide in the troponin complex that has an affinity for calcium ions, which when bound produces a conformational change in troponin i.


Troponin is a complex made up of three regulatory proteins:

Word origin: from the complex troponin and I for its inhibitory character

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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 troponin. Ca2+ binds to troponin causing a conformational change thus moving tropomyosin allowing the myosin binding site to become open. These binding ...

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by Jpoley
Tue Mar 01, 2011 2:42 am
Forum: Human Biology
Topic: Muscle Contractions
Replies: 1
Views: 7828

Re: Cross Bridge Formation

I'd have to say e) A, B, C Although you might get by saying calcium is the true regulator, its really calcium's presence and its interaction with troponin that allows tropomyosin to moved off the actin binding site.

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by wushufanatic
Fri Oct 23, 2009 10:13 pm
Forum: Human Biology
Topic: Cross Bridge Formation
Replies: 1
Views: 4823

Cross Bridge Formation

... disagree with my professor, so I was hoping to get some other opinions. Regulation of cross-bridge formation is accomplished by a. tropomyosin b. troponin c. calcium ions d. A and B e. A, B, and C

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by ArsenalV17btk
Fri Oct 23, 2009 6:35 pm
Forum: Human Biology
Topic: Cross Bridge Formation
Replies: 1
Views: 4823

Evolution on the molecular level

... of muscle contraction, the action potential causing a release of Calcium from the SR, followed by the "turning off" of tropomyosin by troponin to expose the active sites on the myosin heads so that they can bind to the actin and initiate contraction, then you know what an incredible ...

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by rogcha22
Fri Feb 22, 2008 10:37 pm
Forum: Evolution
Topic: Evolution on the molecular level
Replies: 5
Views: 4476


Troponin is a serum cardiac marker that is released into the blood in large quantities from the necrotic heart muscle after a heart attack. It is a very good indicator because it remains elevated two weeks after the initial ...

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by bionewbie
Thu Apr 12, 2007 1:14 am
Forum: Human Biology
Topic: troponin
Replies: 2
Views: 3560
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