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Induced Chirality in QDs Using Thermoresponsive Elastin-like Polypeptides.
Langmuir
January 2025
Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.
Circular dichroism (CD) spectroscopy has emerged as a potent tool for probing chiral small-molecule ligand exchange on natively achiral quantum dots (QDs). In this study, we report a novel approach to identifying QD-biomolecule interactions by inducing chirality in CdS QDs using thermoresponsive elastin-like polypeptides (ELPs) engineered with C-terminal cysteine residues. Our method is based on a versatile two-step ligand exchange process starting from monodisperse oleate-capped QDs in nonpolar media and proceeding through an easily accessed achiral glycine-capped QD intermediate.
View Article and Find Full Text PDFSmall-angle X-ray scattering of engineered antigen-binding fragments: the case of glycosylated Fab from the Mannitou IgM antibody.
Acta Crystallogr F Struct Biol Commun
January 2025
Unité de Glycobiologie Structurale et Fonctionnelle (UGSF), UMR 8576 CNRS and University of Lille, Villeneuve d'Ascq, France.
Monoclonal antibodies recognizing nonprotein antigens remain largely underrepresented in our understanding of the molecular repertoire of innate and adaptive immunity. One such antibody is Mannitou, a murine IgM that recognizes paucimannosidic glycans. In this work, we report the production and purification of the recombinant antigen-binding fragment (Fab) of Mannitou IgM (Mannitou Fab) and employ a combination of biochemical and biophysical approaches to obtain its initial structural characterization.
View Article and Find Full Text PDFSmall angle X-ray scattering and based structure and function analysis of a novel xylobiohydrolase (GH30A) from .
J Biomol Struct Dyn
November 2024
Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India.
Xylobiohydrolase plays a crucial role in the hydrolysis of xylan, a complex polysaccharide present in the cell walls of plants. This study focuses on the solution structure and substrate binding analysis of a novel xylobiohydrolase, GH30A, from . Secondary structure analysis of GH30A in an aqueous environment using Circular Dichroism and modeling revealed an α/β/α sandwich structure with a central β-barrel comprising eight β-strands.
View Article and Find Full Text PDFCholesterol Conjugated Elastin-like Recombinamers: Molecular Dynamics Simulations, Conformational Changes, and Bioactivity.
ACS Appl Mater Interfaces
December 2024
Colloids and Polymers Physics Group, Department of Applied Physics, Faculty of Physics and Institute of Materials (iMATUS) and Institute of Health Research (IDIS), University of Santiago de Compostela, 15782 Santiago de Compostela, Spain.
Current models for elastin-like recombinamer (ELR) design struggle to predict the effects of nonprotein fused materials on polypeptide conformation and temperature-responsive properties. To address this shortage, we investigated the novel functionalization of ELRs with cholesterol (CTA). We employed GROMACS computational molecular dynamic simulations complemented with experimental evidence to validate the predictions.
View Article and Find Full Text PDFLiquid Crystal Behavior of Uniform Short Rods Made from Computationally Designed Parallel Coiled Coil Building Blocks.
ACS Macro Lett
November 2024
Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United States.
Parallel, homotetrameric coiled coils were computationally designed using 29 amino acid peptides. These parallel coiled coils, called "bundlemers", have symmetry, with all N-termini displayed from one end of the nanoparticle and all C-termini from the opposite end. This anisotropic display of the peptide termini allowed for the functionalization of two sets of nanoparticles with either maleimide or thiol functionality at the N-terminal region of the constituent peptides.
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