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Folding Kinetics and Volume Variation of the β-Hairpin Peptide Chignolin upon Ultrafast pH-Jumps.
J Phys Chem B
May 2024
CQC-IMS, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
In-depth characterization of fundamental folding steps of small model peptides is crucial for a better understanding of the folding mechanisms of more complex biomacromolecules. We have previously reported on the folding/unfolding kinetics of a model α-helix. Here, we study folding transitions in chignolin (GYDPETGTWG), a short β-hairpin peptide previously used as a model to study conformational changes in β-sheet proteins.
View Article and Find Full Text PDFPhotoacoustic Calorimetry Studies of O-Sensing FixL and (R200, I209) Variants from Reveal Conformational Changes Coupled to Ligand Photodissociation from the Heme-PAS Domain.
Biochemistry
January 2024
Department of Chemistry and Biochemistry, Saint Joseph's University, 5600 City Avenue, Philadelphia, Pennsylvania 19131, United States.
FixL is an oxygen-sensing heme-PAS protein that regulates nitrogen fixation in the root nodules of plants. In this paper, we present the first photothermal studies of the full-length wild-type FixL protein from and the first thermodynamic profile of a full-length heme-PAS protein. Photoacoustic calorimetry studies reveal a quadriphasic relaxation for FixL*WT and the five variant proteins (FixL*R200H, FixL*R200Q, FixL*R200E, FixL*R200A, and FixL*I209M) with four intermediates from <20 ns to ∼1.
View Article and Find Full Text PDFThermal transport properties of porous silicon filled by ionic liquid nanocomposite system.
Sci Rep
April 2023
Université de Lorraine, CNRS, LEMTA, 54000, Nancy, France.
This paper investigates thermal transport in a nanocomposite system consisting of a porous silicon matrix filled with ionic liquid. Firstly, the thermal conductivity and heat capacity of two imidazolium and one ammonium ionic liquids were evaluated using the photoacoustic approach in piezoelectric configuration and differential scanning calorimetry, respectively. Then, the thermal transport properties of the composite system "ionic liquid confined inside porous silicon matrix" were investigated with the photoacoustic approach in gas-microphone configuration.
View Article and Find Full Text PDFSinglet Exciton Fission and Associated Enthalpy Changes with a Covalently Linked Bichromophore Comprising TIPS-Pentacenes Held in an Open Conformation.
J Phys Chem A
February 2021
CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
A covalently linked bichromophore, embracing 6,13-bis(triisopropylsilylethinyl)pentacene (TIPS-pentacene) terminals bridged by a rigid fluorene spacer, generates a relatively high yield (i.e., 65 ± 6%) of the spin-correlated, triplet biexciton upon illumination in toluene.
View Article and Find Full Text PDFA novel method of acoustic resonance laser calorimetry (ARLC) for the determination of low optical absorption coefficients of crystals and glasses is introduced. It is based on measurements of the kinetics of the equivalent temperature of the sample irradiated by the pulse laser radiation. The equivalent temperature of the sample is directly obtained by measuring the frequency changes of its temperature-calibrated acoustic resonances excited by the laser radiation with a corresponding pulse repetition rate.
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