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A Model of Zymogen Factor XII: Insights into Protease Activation.
Blood Adv
January 2025
Vanderbilt University Medical Center, Nashville, Tennessee, United States.
In plasma, the zymogens factor XII (FXII) and prekallikrein reciprocally convert each other to the proteases FXIIa and plasma kallikrein (PKa). PKa cleaves high-molecular-weight kininogen (HK) to release bradykinin, which contributes to regulation of blood vessel tone and permeability. Plasma FXII is normally in a "closed" conformation that limits activation by PKa.
View Article and Find Full Text PDFRole of Superlattice Phonons in Charge Localization Across Quantum Dot Arrays.
ACS Nano
January 2025
Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States.
Understanding charge transport in semiconductor quantum dot (QD) assemblies is important for developing the next generation of solar cells and light-harvesting devices based on QD technology. One of the key factors that governs the transport in such systems is related to the hybridization between the QDs. Recent experiments have successfully synthesized QD molecules, arrays, and assemblies by directly fusing the QDs, with enhanced hybridization leading to high carrier mobilities and coherent band-like electronic transport.
View Article and Find Full Text PDFKaryotype Evolution of Suliformes and Description of a ♂Z1Z1Z2Z2/♀Z1Z2W Multiple Sex Chromosome System in boobies (Sula spp.).
Genome
January 2025
Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil;
Our comprehension of avian karyotypes still needs to be improved, especially for Suliform birds. To enhance understanding of chromosomal evolution in this order, we conducted conventional and molecular cytogenetic analysis in five species, named Sula dactylatra, S. leucogaster, S.
View Article and Find Full Text PDFChanges in Adsorption, Aggregation, and Diffusion Nature of Amyloid β on a Lipid Membrane in an Open System.
Langmuir
January 2025
Faculty of Science, Yamagata University, 1-4-12, Kojirakawa, Yamagata 990-8560, Japan.
The aggregation and accumulation of amyloid β 42 (Aβ42) peptides on the surface of brain cells is associated with Alzheimer's disease (AD); however, the underlying molecular mechanisms remain unclear. Herein, we used a unique brain-mimetic open system that continuously flows Aβ42 solution to analyze the initial aggregation and adsorptive nature of Aβ42 at physiological concentrations on the lipid membrane. The open system accelerated the adsorption and dimerization kinetics.
View Article and Find Full Text PDFBiomimetic Silk Nanoparticle Manufacture: Calcium Ion-Mediated Assembly.
ACS Biomater Sci Eng
January 2025
Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral St., Glasgow G4 0RE,Scotland,U.K.
Silk has emerged as an interesting candidate among protein-based nanocarriers due to its favorable properties, including biocompatibility and a broad spectrum of processing options to tune particle critical quality attributes. The silk protein conformation during storage in the middle silk gland of the silkworm is modulated by various factors, including the most abundant metallic ion, calcium ion (Ca). Here, we report spiking of liquid silk with calcium ions to modulate the silk nanoparticle size.
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