Single-molecule measurements of rotation catalyzed by the F(1)-ATPase or the F(o)F(1) ATP synthase have provided new insights into the molecular mechanisms of the F(1) and F(o) molecular motors. We recently developed a method to record ATPase-driven rotation of F(1) or F(o)F(1) in a manner that solves several technical limitations of earlier approaches that were significantly hampered by time and angular resolution, and restricted the duration of data collection. With our approach it is possible to collect data for hours and obtain statistically significant quantities of data on each molecule examined with a time resolution of up to 5 μs at unprecedented signal-to-noise.
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http://dx.doi.org/10.1007/978-1-61779-261-8_18 | DOI Listing |
J Agric Food Chem
January 2025
CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
BcABA3 is an unusual sesquiterpene synthase that lacks the conserved DDxxD and DTE/NSE motifs. Despite this, it can catalyze the conversion of farnesyl diphosphate to 2Z,4E-α-ionylideneethane. We used structure prediction, multiscale simulations, and site-directed mutagenesis experiments to investigate BcABA3 and its catalytic mechanism.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, 999077, Hong Kong SAR, China.
Hydroboration of allenes is powerful and atom-economic approach to the synthesis of organoboranes, such as the highly versatile allylboranes. However, regarding regiocontrol, existing methods uniformly deliver the boron functionality to the less hindered β- or γ-position, but not the α-position. The latter is particularly challenging for allenes with substantial steric difference between the two terminals and lacking electronic bias (e.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Clemens-Schöpf-Institute for Organic Chemistry and Biochemistry, Technical University of Darmstadt, Peter-Grünberg-Str.16, 64287, Darmstadt, Germany.
Modern nuclear magnetic resonance (NMR) methods like carbon relaxation dispersion in the rotating frame (C-R) and proton chemical exchange saturation transfer (H-CEST) are key methods to investigate molecular recognition in biomacromolecules and to detect molecular motions on the μs to s timescale, revealing transient conformational states. Changes in kinetics can be linked to binding, folding, or catalytic events. Here, we investigated whether these methods allow detection of changes in the dynamics of a small, highly selective peptide catalyst during recognition of its enantiomeric substrates.
View Article and Find Full Text PDFNat Commun
November 2024
Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China.
The catalytic asymmetric synthesis of axially chiral alkenes remains a daunting challenge due to the lower rotational barrier, especially for longer stereogenic axis (e.g. C-B axis).
View Article and Find Full Text PDFAngew Chem Int Ed Engl
November 2024
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022, Changchun, Jilin, China.
Ultrasound-mediated reactive oxygen species (ROS) generation is pivotal in specifically inducing pyroptosis of tumor cells. However, the effectiveness of pyroptosis is generally hindered by the constraints of ROS generation efficiency. Herein, a new porphyrin-based metal-organic framework (Fe(TCPP)-MOF) was rationally designed via an innovative dual-solvent strategy to amplify ROS generation for ultrasound-controlled pyroptosis.
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