8gjc | pdb_00008gjc

X-ray crystallographic structure of a beta-hairpin peptide derived from Abeta 17-35. (ORN)LVFFAED(ORN)GAI(N-Me-Ile)GLM

spinqualitylabelsall models 8gjc, resolution 1.43Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8gjc is a 2 chain structure with sequence from Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.431Å Ligands: IML, MET, ORN, PEG, TFA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Amyloid-beta (Abeta) forms heterogeneous oligomers, which are implicated in the pathogenesis of Alzheimer's disease (AD). Many Abeta oligomers consist of beta-hairpin building blocks horizontal line Abeta peptides in beta-hairpin conformations. beta-Hairpins of Abeta can adopt a variety of alignments, but the role that beta-hairpin alignment plays in the formation and heterogeneity of Abeta oligomers is poorly understood. To explore the effect of beta-hairpin alignment on the oligomerization of Abeta peptides, we designed and studied two model peptides with two different beta-hairpin alignments. Peptides Abetam(17-36) and Abetam(17-35) mimic two different beta-hairpins that Abeta can form, the Abeta(17-36) and Abeta(17-35) beta-hairpins, respectively. These hairpins are similar in composition but differ in hairpin alignment, altering the facial arrangements of the side chains of the residues that they contain. X-ray crystallography and SDS-PAGE demonstrate that the difference in facial arrangement between these peptides leads to distinct oligomer formation. In the crystal state, Abetam(17-36) forms triangular trimers that further assemble to form hexamers, while Abetam(17-35) forms tetrameric beta-barrels. In SDS-PAGE, Abetam(17-36) assembles to form a ladder of oligomers, while Abetam(17-35) either assembles to form a dimer or does not assemble at all. The differences in the behavior of Abetam(17-36) and Abetam(17-35) suggest beta-hairpin alignment as a source of the observed heterogeneity of Abeta oligomers. beta-Hairpin Alignment Alters Oligomer Formation in Abeta-Derived Peptides.,Ruttenberg SM, Kreutzer AG, Truex NL, Nowick JS Biochemistry. 2024 Jan 16;63(2):212-218. doi: 10.1021/acs.biochem.3c00526. Epub , 2024 Jan 1. PMID:38163326 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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