9hik

X-ray structure of Perm3, a circularly permuted mutant of the sweet protein MNEI

spinqualitylabelsall models 9hik, resolution 1.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9hik is a 1 chain structure with sequence from Dioscoreophyllum cumminsii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.15Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MONA_DIOCU Taste-modifying protein; intensely sweet-tasting protein.MONB_DIOCU Taste-modifying protein; intensely sweet-tasting protein. Publication Abstract from PubMed Protein amyloid aggregates, once regarded solely as pathological hallmarks of human neurodegenerative diseases, have recently gained attention for their potential in biotechnological applications. Among others, MNEI and its variants, initially developed as single-chain derivatives of the sweet protein monellin, also serve as valuable models for studying protein fibrillary aggregation. In this work, we have characterized three circular permutated mutants of MNEI obtained joining the N- and C-termini of MNEI with linkers of different length and restoring the splitting of the polypeptide chain of native monellin. All proteins are well folded but have a different propensity to form oligomeric structures in solution and aggregation rates comparable to or faster than MNEI, as indicated by Thioflavin-T binding assays. Transmission Electron Microscopy (TEM) studies indicate that only Perm1, the mutant with the longest linker, forms fibrillar aggregates. X-ray structures of the mutants show that they crystallize as domain-swapped dimers. Molecular dynamics study highlights potential hot spots controlling the ordered aggregation process of Perm1. Our data support the idea that the formation of a domain-swapped dimer does not favour the formation of fibrillar aggregates and highlight circular permutation as a valuable tool to build nanostructured biomaterials. Unravelling the amyloid aggregation mechanism of the sweet protein Monellin: Insights from circular permutated mutants.,Lucignano R, Bologna A, Gramazio S, Wang PH, Taxis C, Essen LO, Picone D, Spadaccini R Int J Biol Macromol. 2025 Mar 19;308(Pt 1):142239. doi: , 10.1016/j.ijbiomac.2025.142239. PMID:40118405 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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