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3c3f

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[[Image:3c3f.jpg|left|200px]]
 
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==alpha/beta-Peptide helix bundles: The GCN4-pLI side chain sequence on an (alpha-alpha-alpha-beta) backbone==
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The line below this paragraph, containing "STRUCTURE_3c3f", creates the "Structure Box" on the page.
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<StructureSection load='3c3f' size='340' side='right'caption='[[3c3f]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[3c3f]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3C3F OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3C3F FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=B3D:3-AMINOPENTANEDIOIC+ACID'>B3D</scene>, <scene name='pdbligand=B3E:(3S)-3-AMINOHEXANEDIOIC+ACID'>B3E</scene>, <scene name='pdbligand=B3K:(3S)-3,7-DIAMINOHEPTANOIC+ACID'>B3K</scene>, <scene name='pdbligand=B3L:(3S)-3-AMINO-5-METHYLHEXANOIC+ACID'>B3L</scene>, <scene name='pdbligand=BAL:BETA-ALANINE'>BAL</scene>, <scene name='pdbligand=BIL:(3R,4S)-3-AMINO-4-METHYLHEXANOIC+ACID'>BIL</scene></td></tr>
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{{STRUCTURE_3c3f| PDB=3c3f | SCENE= }}
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3c3f FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3c3f OCA], [https://pdbe.org/3c3f PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3c3f RCSB], [https://www.ebi.ac.uk/pdbsum/3c3f PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3c3f ProSAT]</span></td></tr>
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</table>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The extent to which polypeptide conformation depends on side-chain composition and sequence has been widely studied, but less is known about the importance of maintaining an alpha-amino acid backbone. Here, we examine a series of peptides with backbones that feature different repeating patterns of alpha- and beta-amino acid residues but an invariant side-chain sequence. In the pure alpha-backbone, this sequence corresponds to the previously studied peptide GCN4-pLI, which forms a very stable four-helix bundle quaternary structure. Physical characterization in solution and crystallographic structure determination show that a variety of alpha/beta-peptide backbones can adopt sequence-encoded quaternary structures similar to that of the alpha prototype. There is a loss in helix bundle stability upon beta-residue incorporation; however, stability of the quaternary structure is not a simple function of beta-residue content. We find that cyclically constrained beta-amino acid residues can stabilize the folds of alpha/beta-peptide GCN4-pLI analogues and restore quaternary structure formation to backbones that are predominantly unfolded in the absence of cyclic residues. Our results show a surprising degree of plasticity in terms of the backbone compositions that can manifest the structural information encoded in a sequence of amino acid side chains. These findings offer a framework for the design of nonnatural oligomers that mimic the structural and functional properties of proteins.
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'''alpha/beta-Peptide helix bundles: The GCN4-pLI side chain sequence on an (alpha-alpha-alpha-beta) backbone'''
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Interplay among side chain sequence, backbone composition, and residue rigidification in polypeptide folding and assembly.,Horne WS, Price JL, Gellman SH Proc Natl Acad Sci U S A. 2008 Jul 8;105(27):9151-6. Epub 2008 Jun 27. PMID:18587049<ref>PMID:18587049</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==About this Structure==
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</div>
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3C3F is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3C3F OCA].
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<div class="pdbe-citations 3c3f" style="background-color:#fffaf0;"></div>
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[[Category: Single protein]]
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== References ==
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[[Category: Gellman, S H.]]
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<references/>
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[[Category: Horne, W S.]]
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__TOC__
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[[Category: Price, J L.]]
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</StructureSection>
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[[Category: Coiled coil]]
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[[Category: Large Structures]]
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[[Category: De novo protein]]
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[[Category: Synthetic construct]]
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[[Category: Foldamer]]
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[[Category: Gellman SH]]
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[[Category: Helix bundle]]
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[[Category: Horne WS]]
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[[Category: Unknown function]]
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[[Category: Price JL]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jun 18 12:09:09 2008''
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Current revision

alpha/beta-Peptide helix bundles: The GCN4-pLI side chain sequence on an (alpha-alpha-alpha-beta) backbone

PDB ID 3c3f

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