1ic2

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[[Image:1ic2.gif|left|200px]]
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{{STRUCTURE_1ic2| PDB=1ic2 | SCENE= }}
{{STRUCTURE_1ic2| PDB=1ic2 | SCENE= }}
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'''DECIPHERING THE DESIGN OF THE TROPOMYOSIN MOLECULE'''
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===DECIPHERING THE DESIGN OF THE TROPOMYOSIN MOLECULE===
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==Overview==
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The crystal structure at 2.0-A resolution of an 81-residue N-terminal fragment of muscle alpha-tropomyosin reveals a parallel two-stranded alpha-helical coiled-coil structure with a remarkable core. The high alanine content of the molecule is clustered into short regions where the local 2-fold symmetry is broken by a small (approximately 1.2-A) axial staggering of the helices. The joining of these regions with neighboring segments, where the helices are in axial register, gives rise to specific bends in the molecular axis. We observe such bends to be widely distributed in two-stranded alpha-helical coiled-coil proteins. This asymmetric design in a dimer of identical (or highly similar) sequences allows the tropomyosin molecule to adopt multiple bent conformations. The seven alanine clusters in the core of the complete molecule (which spans seven monomers of the actin helix) promote the semiflexible winding of the tropomyosin filament necessary for its regulatory role in muscle contraction.
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The line below this paragraph, {{ABSTRACT_PUBMED_11438684}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 11438684 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11438684}}
==About this Structure==
==About this Structure==
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[[Category: Bend]]
[[Category: Bend]]
[[Category: Symmetry]]
[[Category: Symmetry]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:49:48 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:44:34 2008''

Revision as of 07:44, 1 July 2008

Image:1ic2.png

Template:STRUCTURE 1ic2

DECIPHERING THE DESIGN OF THE TROPOMYOSIN MOLECULE

Template:ABSTRACT PUBMED 11438684

About this Structure

1IC2 is a Single protein structure of sequence from Gallus gallus. Full crystallographic information is available from OCA.

Reference

Deciphering the design of the tropomyosin molecule., Brown JH, Kim KH, Jun G, Greenfield NJ, Dominguez R, Volkmann N, Hitchcock-DeGregori SE, Cohen C, Proc Natl Acad Sci U S A. 2001 Jul 17;98(15):8496-501. Epub 2001 Jul 3. PMID:11438684

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