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1l6l

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[[Image:1l6l.gif|left|200px]]
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{{STRUCTURE_1l6l| PDB=1l6l | SCENE= }}
{{STRUCTURE_1l6l| PDB=1l6l | SCENE= }}
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'''Structures of Apolipoprotein A-II and a Lipid Surrogate Complex Provide Insights into Apolipoprotein-Lipid Interactions'''
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===Structures of Apolipoprotein A-II and a Lipid Surrogate Complex Provide Insights into Apolipoprotein-Lipid Interactions===
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==Overview==
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Apolipoproteins A-I and A-II form the major protein constituents of high-density lipid particles (HDL), the concentration of which is inversely correlated with the frequency of heart disease in humans. Although the physiological role of apolipoprotein A-II is unclear, evidence for its involvement in free fatty acid metabolism in mice has recently been obtained. Currently, the best characterized activity of apolipoprotein A-II is its potent antagonism of the anti-atherogenic and anti-inflammatory activities of apolipoprotein A-I, probably due to its competition with the latter for lipid acyl side chains in HDL. Many interactions of apolipoprotein A-I with enzymes and proteins involved in reverse cholesterol transport and HDL maturation are mediated by lipid-bound protein. The structural bases of interaction with lipids are expected to be common to exchangeable apolipoproteins and attributable to amphipathic alpha-helices present in each of them. Thus, characterization of apolipoprotein-lipid interactions in any apolipoprotein is likely to provide information that is applicable to the entire class. We report structures of human apolipoprotein A-II and its complex with beta-octyl glucoside, a widely used lipid surrogate. The former shows that disulfide-linked dimers of apolipoprotein A-II form amphipathic alpha-helices which aggregate into tetramers. Dramatic changes, observed in the presence of beta-octyl glucoside, might provide clues to the structural basis for its antagonism of apolipoprotein A-I. Additionally, excursions of individual molecules of apolipoprotein A-II from a common helical architecture in both structures indicate that lipid-bound apolipoproteins are likely to have an ensemble of related conformations. These structures provide the first experimental paradigm for description of apolipoprotein-lipid interactions at the atomic level.
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(as it appears on PubMed at http://www.pubmed.gov), where 12269810 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12269810}}
==About this Structure==
==About this Structure==
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[[Category: Helix]]
[[Category: Helix]]
[[Category: High density lipid]]
[[Category: High density lipid]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 23:35:46 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 11:48:49 2008''

Revision as of 08:48, 2 July 2008

Image:1l6l.png

Template:STRUCTURE 1l6l

Structures of Apolipoprotein A-II and a Lipid Surrogate Complex Provide Insights into Apolipoprotein-Lipid Interactions

Template:ABSTRACT PUBMED 12269810

About this Structure

1L6L is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structures of apolipoprotein A-II and a lipid-surrogate complex provide insights into apolipoprotein-lipid interactions., Kumar MS, Carson M, Hussain MM, Murthy HM, Biochemistry. 2002 Oct 1;41(39):11681-91. PMID:12269810

Page seeded by OCA on Wed Jul 2 11:48:49 2008

Proteopedia Page Contributors and Editors (what is this?)

OCA, Eric Martz

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