1la0

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[[Image:1la0.gif|left|200px]]
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{{STRUCTURE_1la0| PDB=1la0 | SCENE= }}
{{STRUCTURE_1la0| PDB=1la0 | SCENE= }}
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'''Solution Structure of Calcium Saturated Cardiac Troponin C in the Troponin C-Troponin I Complex'''
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===Solution Structure of Calcium Saturated Cardiac Troponin C in the Troponin C-Troponin I Complex===
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==Overview==
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Cardiac troponin C (TnC) is composed of two globular domains connected by a flexible linker. In solution, linker flexibility results in an ill defined orientation of the two globular domains relative to one another. We have previously shown a decrease in linker flexibility in response to cardiac troponin I (cTnI) binding. To investigate the relative orientation of calcium-saturated TnC domains when bound to cTnI, (1)H-(15)N residual dipolar couplings were measured in two different alignment media. Similarity in alignment tensor orientation for the two TnC domains supports restriction of domain motion in the presence of cTnI. The relative spatial orientation of TnC domains bound to TnI was calculated from measured residual dipolar couplings and long-range distance restraints utilizing a rigid body molecular dynamics protocol. The relative domain orientation is such that hydrophobic pockets face each other, forming a latch to constrain separate helical segments of TnI. We have utilized this structure to successfully explain the observed functional consequences of linker region deletion mutants. Together, these studies suggest that, although linker plasticity is important, the ability of TnC to function in muscle contraction can be correlated with a preferred domain orientation and interdomain distance.
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The line below this paragraph, {{ABSTRACT_PUBMED_12147696}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 12147696 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12147696}}
==About this Structure==
==About this Structure==
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1LA0 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LA0 OCA].
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1LA0 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LA0 OCA].
==Reference==
==Reference==
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[[Category: Ef-hand]]
[[Category: Ef-hand]]
[[Category: Troponin]]
[[Category: Troponin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 23:42:43 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 12:05:02 2008''

Revision as of 09:05, 2 July 2008

Image:1la0.png

Template:STRUCTURE 1la0

Solution Structure of Calcium Saturated Cardiac Troponin C in the Troponin C-Troponin I Complex

Template:ABSTRACT PUBMED 12147696

About this Structure

1LA0 is a Single protein structure of sequence from Gallus gallus. Full experimental information is available from OCA.

Reference

Solution structure of calcium-saturated cardiac troponin C bound to cardiac troponin I., Dvoretsky A, Abusamhadneh EM, Howarth JW, Rosevear PR, J Biol Chem. 2002 Oct 11;277(41):38565-70. Epub 2002 Jul 29. PMID:12147696

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