Insights into the Hierarchical Assembly of a Chemically Diverse Peptide Hydrogel Derived from Human Semenogelin I
(2024) In ACS Nano 18(45). p.31109-31122- Abstract
A peptide corresponding to a 13-residue segment of the human protein semenogelin I has been shown to generate a hydrogel consisting of amyloid-like fibrils. The relative chemical diversity (compared to synthetic de novo sequences) with 11 distinct amino acids makes this peptide (P0) an ideal candidate for investigating the role of individual residues in gelation. Herein, the N-terminal residues have been sequentially removed to furnish a series of truncated peptides, P1-P10, ranging from 12 to 3 residues in length. FTIR spectroscopy investigations reveal that P0-P6 forms a β-sheet secondary structure while shorter sequences do not self-assemble. Site-specific isotope labeling of the amide backbone of P0-P2 with the IR-sensitive... (More)
A peptide corresponding to a 13-residue segment of the human protein semenogelin I has been shown to generate a hydrogel consisting of amyloid-like fibrils. The relative chemical diversity (compared to synthetic de novo sequences) with 11 distinct amino acids makes this peptide (P0) an ideal candidate for investigating the role of individual residues in gelation. Herein, the N-terminal residues have been sequentially removed to furnish a series of truncated peptides, P1-P10, ranging from 12 to 3 residues in length. FTIR spectroscopy investigations reveal that P0-P6 forms a β-sheet secondary structure while shorter sequences do not self-assemble. Site-specific isotope labeling of the amide backbone of P0-P2 with the IR-sensitive vibrational probe 13C═O yields FTIR spectra indicative of the initial formation of a kinetic product that slowly transforms into a structurally different thermodynamic product. The effects of the isotopic labels on the IR spectra facilitate the assignment of parallel and antiparallel structures, which are sometimes coexistent. Additional IR studies of three PheCN-labeled P0 sequences are consistent with an H-bonded β-sheet amide core, spanning the 7 central residues. The macromolecular assembly of peptides that form β-sheets was assessed by cryo-TEM, SAXS/WAXS, and rheology. Cryo-TEM images of peptides P1-P6 display μm-long nanofibrils. Peptides P0-P3 generate homogeneous hydrogels composed of colloidally stable nanofibrils, and P4-P6 undergo phase separation due to the accumulation of attractive interfibrillar interactions. Three amino acid residues, Ser39, Phe40, and Gln43, were identified to be of particular interest in the truncated peptide series as the removal of any one of them, as the sequence shortens, leads to a major change in material properties.
(Less)
- author
- organization
-
- Physical Chemistry
- NanoLund: Centre for Nanoscience
- LTH Profile Area: Nanoscience and Semiconductor Technology
- LU Profile Area: Light and Materials
- Biochemistry and Structural Biology
- MultiPark: Multidisciplinary research focused on Parkinson's disease
- LU Profile Area: Proactive Ageing
- Department of Chemistry
- publishing date
- 2024-11-12
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- amyloid, isotope effects, peptide aggregation, protein fragment, self-assembly, supramolecular assembly, X-ray scattering
- in
- ACS Nano
- volume
- 18
- issue
- 45
- pages
- 14 pages
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85208392779
- pmid:39487039
- ISSN
- 1936-0851
- DOI
- 10.1021/acsnano.4c08672
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2024 The Authors. Published by American Chemical Society.
- id
- c1d4e043-d0cb-4078-9063-596f41f2d442
- date added to LUP
- 2025-01-09 11:36:20
- date last changed
- 2025-07-11 16:19:26
@article{c1d4e043-d0cb-4078-9063-596f41f2d442,
abstract = {{<p>A peptide corresponding to a 13-residue segment of the human protein semenogelin I has been shown to generate a hydrogel consisting of amyloid-like fibrils. The relative chemical diversity (compared to synthetic de novo sequences) with 11 distinct amino acids makes this peptide (P0) an ideal candidate for investigating the role of individual residues in gelation. Herein, the N-terminal residues have been sequentially removed to furnish a series of truncated peptides, P1-P10, ranging from 12 to 3 residues in length. FTIR spectroscopy investigations reveal that P0-P6 forms a β-sheet secondary structure while shorter sequences do not self-assemble. Site-specific isotope labeling of the amide backbone of P0-P2 with the IR-sensitive vibrational probe <sup>13</sup>C═O yields FTIR spectra indicative of the initial formation of a kinetic product that slowly transforms into a structurally different thermodynamic product. The effects of the isotopic labels on the IR spectra facilitate the assignment of parallel and antiparallel structures, which are sometimes coexistent. Additional IR studies of three Phe<sup>CN</sup>-labeled P0 sequences are consistent with an H-bonded β-sheet amide core, spanning the 7 central residues. The macromolecular assembly of peptides that form β-sheets was assessed by cryo-TEM, SAXS/WAXS, and rheology. Cryo-TEM images of peptides P1-P6 display μm-long nanofibrils. Peptides P0-P3 generate homogeneous hydrogels composed of colloidally stable nanofibrils, and P4-P6 undergo phase separation due to the accumulation of attractive interfibrillar interactions. Three amino acid residues, Ser39, Phe40, and Gln43, were identified to be of particular interest in the truncated peptide series as the removal of any one of them, as the sequence shortens, leads to a major change in material properties.</p>}},
author = {{Pogostin, Brett H. and Godbe, Kerilyn and Dubackic, Marija and Angstman, Isabelle and Fox, William and Giovino, Natalie and Lagator, Matija and Payson, Abigail and LaBarca, Marisa and Frohm, Birgitta and Bernfur, Katja and Linse, Sara and Londergan, Casey H. and Olsson, Ulf and Gentile, Luigi and Åkerfeldt, Karin S.}},
issn = {{1936-0851}},
keywords = {{amyloid; isotope effects; peptide aggregation; protein fragment; self-assembly; supramolecular assembly; X-ray scattering}},
language = {{eng}},
month = {{11}},
number = {{45}},
pages = {{31109--31122}},
publisher = {{The American Chemical Society (ACS)}},
series = {{ACS Nano}},
title = {{Insights into the Hierarchical Assembly of a Chemically Diverse Peptide Hydrogel Derived from Human Semenogelin I}},
url = {{http://dx.doi.org/10.1021/acsnano.4c08672}},
doi = {{10.1021/acsnano.4c08672}},
volume = {{18}},
year = {{2024}},
}