1eq1

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[[Image:1eq1.gif|left|200px]]
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{{STRUCTURE_1eq1| PDB=1eq1 | SCENE= }}
{{STRUCTURE_1eq1| PDB=1eq1 | SCENE= }}
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'''NMR STRUCTURE OF AN EXCHANGEABLE APOLIPOPROTEIN-MANDUCA SEXTA APOLIPOPHORIN-III'''
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===NMR STRUCTURE OF AN EXCHANGEABLE APOLIPOPROTEIN-MANDUCA SEXTA APOLIPOPHORIN-III===
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==Overview==
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The high-resolution NMR structure of apolipophorin III from the sphinx moth, Manduca sexta, has been determined in the lipid-free state. We show that lipid-free apolipophorin III adopts a unique helix-bundle topology that has several characteristic structural features. These include a marginally stable, up-and-down helix bundle that allows for concerted opening of the bundle about "hinged" loops upon lipid interaction and buried polar/ionizable residues and buried interhelical H-bonds located in the otherwise hydrophobic interior of the bundle that adjust protein stability and facilitate lipid-induced conformational opening. We suggest that these structural features modulate the conformational adaptability of the lipid-free helix bundle upon lipid binding and control return of the open conformation to the original lipid-free helix-bundle state. Taken together, these data provide a structural rationale for the ability of exchangeable apolipoproteins to reversibly interact with circulating lipoprotein particles.
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{{ABSTRACT_PUBMED_11818551}}
==About this Structure==
==About this Structure==
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1EQ1 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Manduca_sexta Manduca sexta]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQ1 OCA].
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1EQ1 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Manduca_sexta Manduca sexta]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQ1 OCA].
==Reference==
==Reference==
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[[Category: Helix-short helix-helix recognition motif]]
[[Category: Helix-short helix-helix recognition motif]]
[[Category: Five helix-bundle]]
[[Category: Five helix-bundle]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 01:36:48 2008''

Revision as of 22:36, 30 June 2008

Image:1eq1.png

Template:STRUCTURE 1eq1

NMR STRUCTURE OF AN EXCHANGEABLE APOLIPOPROTEIN-MANDUCA SEXTA APOLIPOPHORIN-III

Template:ABSTRACT PUBMED 11818551

About this Structure

1EQ1 is a Single protein structure of sequence from Manduca sexta. Full experimental information is available from OCA.

Reference

Structural basis for the conformational adaptability of apolipophorin III, a helix-bundle exchangeable apolipoprotein., Wang J, Sykes BD, Ryan RO, Proc Natl Acad Sci U S A. 2002 Feb 5;99(3):1188-93. Epub 2002 Jan 29. PMID:11818551

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