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3ctn
From Proteopedia
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'''STRUCTURE OF CALCIUM-SATURATED CARDIAC TROPONIN C, NMR, 30 STRUCTURES''' | '''STRUCTURE OF CALCIUM-SATURATED CARDIAC TROPONIN C, NMR, 30 STRUCTURES''' | ||
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[[Category: Spyracopoulos, L.]] | [[Category: Spyracopoulos, L.]] | ||
[[Category: Sykes, B D.]] | [[Category: Sykes, B D.]] | ||
| - | [[Category: | + | [[Category: Calcium-binding protein]] |
| - | [[Category: | + | [[Category: Cardiac]] |
| - | [[Category: | + | [[Category: Muscle]] |
| - | [[Category: | + | [[Category: Regulatory]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 21:59:14 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 18:59, 4 May 2008
STRUCTURE OF CALCIUM-SATURATED CARDIAC TROPONIN C, NMR, 30 STRUCTURES
Overview
The regulation of cardiac muscle contraction must differ from that of skeletal muscles to effect different physiological and contractile properties. Cardiac troponin C (TnC), the key regulator of cardiac muscle contraction, possesses different functional and Ca2+-binding properties compared with skeletal TnC and features a Ca2+-binding site I, which is naturally inactive. The structure of cardiac TnC in the Ca2+-saturated state has been determined by nuclear magnetic resonance spectroscopy. The regulatory domain exists in a "closed" conformation even in the Ca2+-bound (the "on") state, in contrast to all predicted models and differing significantly from the calcium-induced structure observed in skeletal TnC. This structure in the Ca2+-bound state, and its subsequent interaction with troponin I (TnI), are crucial in determining the specific regulatory mechanism for cardiac muscle contraction. Further, it will allow for an understanding of the action of calcium-sensitizing drugs, which bind to cardiac TnC and are known to enhance the ability of cardiac TnC to activate cardiac muscle contraction.
About this Structure
3CTN is a Single protein structure of sequence from Gallus gallus. Full crystallographic information is available from OCA.
Reference
Structure of cardiac muscle troponin C unexpectedly reveals a closed regulatory domain., Sia SK, Li MX, Spyracopoulos L, Gagne SM, Liu W, Putkey JA, Sykes BD, J Biol Chem. 1997 Jul 18;272(29):18216-21. PMID:9218458 Page seeded by OCA on Sun May 4 21:59:14 2008
