1ale
From Proteopedia
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==Overview== | ==Overview== | ||
| - | Peptides corresponding to the proposed lipid-binding domains of human | + | Peptides corresponding to the proposed lipid-binding domains of human apolipoprotein C-I, residues 7-24 (ALDKLKEFGNTLEDKARE) and 35-53 (SAKMREWFSETFQKVKEKL), were studied by CD and two-dimensional 1H NMR spectroscopy. Sodium dodecyl sulfate (SDS) was used to model the lipoprotein environment. Analysis of the CD data shows that both peptides lack well-defined structure in aqueous solution but adopt helical, ordered structures upon the addition of SDS. The helical nature of the peptides in the presence of SDS was confirmed by H alpha secondary shifts. A total of 199 (apoC-I(7-24)) and 266 (apoC-I(35-53)) distance restraints were used in distance geometry and simulated annealing calculations to generate average structures for both peptides in aqueous solutions containing SDS. The backbone (N, C alpha, C = O) RMSD from the average structure of an ensemble of 20 structures was 0.73 +/- 0.22 and 0.48 +/- 0.14 A for apoC-I(7-24) and apoC-I(35-53), respectively. In the presence of SDS, the distance geometry and simulated annealing calculations show that both peptides adopt well-defined amphipathic helices with distinct hydrophobic and hydrophilic faces. The calculated structures are discussed relative to predicted structures. Comparing our CD and NMR results for the apoC-I fragments in SDS with CD results of others obtained in the presence of dimyristoylphosphatidylcholine indicates that SDS may be a better model of the lipoprotein environment. |
==About this Structure== | ==About this Structure== | ||
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[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Buchko, G | + | [[Category: Buchko, G W.]] |
| - | [[Category: Cushley, R | + | [[Category: Cushley, R J.]] |
[[Category: Rozek, A.]] | [[Category: Rozek, A.]] | ||
[[Category: apolipoprotein]] | [[Category: apolipoprotein]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 11:45:49 2008'' |
Revision as of 09:45, 21 February 2008
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CONFORMATION OF TWO PEPTIDES CORRESPONDING TO HUMAN APOLIPOPROTEIN C-I RESIDUES 7-24 AND 35-53 IN THE PRESENCE OF SODIUM DODECYLSULFATE BY CD AND NMR SPECTROSCOPY
Overview
Peptides corresponding to the proposed lipid-binding domains of human apolipoprotein C-I, residues 7-24 (ALDKLKEFGNTLEDKARE) and 35-53 (SAKMREWFSETFQKVKEKL), were studied by CD and two-dimensional 1H NMR spectroscopy. Sodium dodecyl sulfate (SDS) was used to model the lipoprotein environment. Analysis of the CD data shows that both peptides lack well-defined structure in aqueous solution but adopt helical, ordered structures upon the addition of SDS. The helical nature of the peptides in the presence of SDS was confirmed by H alpha secondary shifts. A total of 199 (apoC-I(7-24)) and 266 (apoC-I(35-53)) distance restraints were used in distance geometry and simulated annealing calculations to generate average structures for both peptides in aqueous solutions containing SDS. The backbone (N, C alpha, C = O) RMSD from the average structure of an ensemble of 20 structures was 0.73 +/- 0.22 and 0.48 +/- 0.14 A for apoC-I(7-24) and apoC-I(35-53), respectively. In the presence of SDS, the distance geometry and simulated annealing calculations show that both peptides adopt well-defined amphipathic helices with distinct hydrophobic and hydrophilic faces. The calculated structures are discussed relative to predicted structures. Comparing our CD and NMR results for the apoC-I fragments in SDS with CD results of others obtained in the presence of dimyristoylphosphatidylcholine indicates that SDS may be a better model of the lipoprotein environment.
About this Structure
1ALE is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Conformation of two peptides corresponding to human apolipoprotein C-I residues 7-24 and 35-53 in the presence of sodium dodecyl sulfate by CD and NMR spectroscopy., Rozek A, Buchko GW, Cushley RJ, Biochemistry. 1995 Jun 6;34(22):7401-8. PMID:7779782
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