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Arrhythmogenic calmodulin variants D131E and Q135P disrupt interaction with the L-type voltage-gated Ca channel (Ca1.2) and reduce Ca-dependent inactivation.
Acta Physiol (Oxf)
February 2025
Department of Biochemistry, Cell and Systems Biology, Institute of Systems, Molecular and Integrative Biology, Faculty of Health and Life Sciences, University of Liverpool, Liverpool, UK.
Aim: Long QT syndrome (LQTS) and catecholaminergic polymorphism ventricular tachycardia (CPVT) are inherited cardiac disorders often caused by mutations in ion channels. These arrhythmia syndromes have recently been associated with calmodulin (CaM) variants. Here, we investigate the impact of the arrhythmogenic variants D131E and Q135P on CaM's structure-function relationship.
View Article and Find Full Text PDFCrepidamycins A-E, pyranonaphthoquinones from endophytic Streptomyces sp. MG-F-1 of Dendrobium crepidatum by the co-culture strategy.
Phytochemistry
January 2025
Jiangsu Key Laboratory for Functional Substances of Chinese Medicine, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, China; State Key Laboratory on Technologies for Chinese Medicine Pharmaceutical Process Control and Intelligent Manufacture, Nanjing University of Chinese Medicine, Nanjing 210023, China. Electronic address:
On the basis of the co-culture strategy, five previously undescribed S-bridged pyranonaphthoquinones, crepidamycins A-E (1-5) and five known analogues (6-10) were isolated from a medicinal plant endophytic Streptomyces sp. MG-F-1 in Dendrobium crepidatum with Bacillus cereus MG-1. The structures and absolute configurations of 1-5 were elucidated by the interpretation of data from detailed spectroscopic analysis and electronic circular dichroism spectra, together with consideration of the biogenetic origins.
View Article and Find Full Text PDFInteraction of starch nanoparticles with digestive enzymes and its effect on the release of polyphenols in simulated gastrointestinal fluids.
Food Chem
January 2025
College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province, 266109, China; Qingdao Special Food Research Institute, Qingdao, 266109, China. Electronic address:
This study investigates the interaction of amino-modified starch nanoparticles (NH-SNPs) and unmodified SNPs with pepsin and trypsin and the influence of the formation of protein coronas on the release of polyphenols. We discovered that NH-SNPs bound loosely to pepsin, while they bound tightly to trypsin, by quartz crystal microbalance with dissipation monitoring and zeta potential measurement. SNPs did not easily bind to the two digestive enzymes.
View Article and Find Full Text PDFAutomating the amino acid identification in elliptical dichroism spectrometer with Machine Learning.
PLoS One
January 2025
Electrical and Computer Engineering, University of Denver, Denver, Colorado, United States of America.
Amino acid identification is crucial across various scientific disciplines, including biochemistry, pharmaceutical research, and medical diagnostics. However, traditional methods such as mass spectrometry require extensive sample preparation and are time-consuming, complex and costly. Therefore, this study presents a pioneering Machine Learning (ML) approach for automatic amino acid identification by utilizing the unique absorption profiles from an Elliptical Dichroism (ED) spectrometer.
View Article and Find Full Text PDFChemical Constituents of the Deep-Sea-Derived Penicillium citrinum W22 and Their Ferroptosis Inhibitory Activity.
Chem Biodivers
January 2025
Hainan Pharmaceutical Research and Development Science Park, Hainan Academy of Medical Sciences, Hainan Medical University, Haikou, China.
One new monomeric citrinin analog (1) and 42 known compounds (2-43) were isolated from Penicillium citrinum W22. The structure of 1 was determined by detailed analysis of the 1D and 2D nuclear magnetic resonance (NMR), HRESIMS, and time-dependent density functional theory (TD-DFT)-based electronic circular dichroism (ECD) calculation. Penicitrinol A (2) and methyl 2-(2-acetyl-3,5-dihydroxy-4,6-dimethylphenyl) acetate (11) significantly inhibited renin-angiotensin system-selective lethal 3 (RSL3)-induced ferroptosis with half maximal effective concentration (EC) values of 1.
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