From Proteopedia
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| - | [[Image:2r2v.jpg|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_2r2v| PDB=2r2v | SCENE= }} | | {{STRUCTURE_2r2v| PDB=2r2v | SCENE= }} |
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| - | '''Sequence Determinants of the Topology of the Lac Repressor Tetrameric Coiled Coil'''
| + | ===Sequence Determinants of the Topology of the Lac Repressor Tetrameric Coiled Coil=== |
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| - | ==Overview==
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| - | Predictive understanding of how the folded, functional shape of a native protein is encoded in the linear sequence of its amino acid residues remains an unsolved challenge in modern structural biology. Antiparallel four-stranded coiled coils are relatively simple protein structures that embody a heptad sequence repeat and rich diversity for tertiary packing of alpha-helices. To explore specific sequence determinants of the lac repressor coiled-coil tetramerization domain, we have engineered a set of buried nonpolar side chains at the a-, d-, and e-positions into the hydrophobic interior of the dimeric GCN4 leucine zipper. Circular dichroism and equilibrium ultracentrifugation studies show that this core variant (GCN4-pAeLV) forms a stable tetrameric structure with a reversible and highly cooperative thermal unfolding transition. The X-ray crystal structure at 1.9 A reveals that GCN4-pAeLV is an antiparallel four-stranded coiled coil of the lac repressor type in which the a, d, and e side chains associate by means of combined knobs-against-knobs and knobs-into-holes packing with a characteristic interhelical offset of 0.25 heptad. Comparison of the side chain shape and packing in the antiparallel tetramers shows that the burial of alanine residues at the e positions between the neighboring helices of GCN4-pAeLV dictates both the antiparallel orientation and helix offset. This study fills in a gap in our knowledge of the determinants of structural specificity in antiparallel coiled coils and improves our understanding of how specific side chain packing forms the teritiary structure of a functional protein.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_18052214}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 18052214 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_18052214}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: De novo protein]] | | [[Category: De novo protein]] |
| | [[Category: Protein design]] | | [[Category: Protein design]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jun 18 12:04:08 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 02:48:40 2008'' |
Revision as of 23:48, 28 July 2008
Template:STRUCTURE 2r2v
Sequence Determinants of the Topology of the Lac Repressor Tetrameric Coiled Coil
Template:ABSTRACT PUBMED 18052214
About this Structure
2R2V is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.
Reference
Conformational specificity of the lac repressor coiled-coil tetramerization domain., Liu J, Zheng Q, Deng Y, Li Q, Kallenbach NR, Lu M, Biochemistry. 2007 Dec 25;46(51):14951-9. Epub 2007 Dec 4. PMID:18052214
Page seeded by OCA on Tue Jul 29 02:48:40 2008
