1ic2
From Proteopedia
(New page: 200px<br /><applet load="1ic2" size="450" color="white" frame="true" align="right" spinBox="true" caption="1ic2, resolution 2.0Å" /> '''DECIPHERING THE DESIG...) |
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| - | [[Image:1ic2.gif|left|200px]]<br /><applet load="1ic2" size=" | + | [[Image:1ic2.gif|left|200px]]<br /><applet load="1ic2" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1ic2, resolution 2.0Å" /> | caption="1ic2, resolution 2.0Å" /> | ||
'''DECIPHERING THE DESIGN OF THE TROPOMYOSIN MOLECULE'''<br /> | '''DECIPHERING THE DESIGN OF THE TROPOMYOSIN MOLECULE'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The crystal structure at 2.0-A resolution of an 81-residue N-terminal | + | 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. |
==About this Structure== | ==About this Structure== | ||
| - | 1IC2 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full crystallographic information is available from [http:// | + | 1IC2 is a [http://en.wikipedia.org/wiki/Single_protein 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=1IC2 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Gallus gallus]] | [[Category: Gallus gallus]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Brown, J | + | [[Category: Brown, J H.]] |
[[Category: Cohen, C.]] | [[Category: Cohen, C.]] | ||
[[Category: Dominguez, R.]] | [[Category: Dominguez, R.]] | ||
| - | [[Category: Greenfield, N | + | [[Category: Greenfield, N J.]] |
| - | [[Category: Hitchcock-DeGregori, S | + | [[Category: Hitchcock-DeGregori, S E.]] |
[[Category: Jun, G.]] | [[Category: Jun, G.]] | ||
| - | [[Category: Kim, K | + | [[Category: Kim, K H.]] |
[[Category: Volkmann, N.]] | [[Category: Volkmann, N.]] | ||
[[Category: alanine]] | [[Category: alanine]] | ||
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[[Category: symmetry]] | [[Category: symmetry]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:10:14 2008'' |
Revision as of 11:10, 21 February 2008
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DECIPHERING THE DESIGN OF THE TROPOMYOSIN MOLECULE
Overview
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.
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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