Takashi Kajitani

Macroscopically anisotropic supramolecular materials prepared from an undercooled liquid-crystalline phase of a cholesterol-based low-molecular-weight compound

Chia-Hsin Cheng, Yuichiro Watanabe, Takashi Kajitani, Sadaki Samitsu et autres

Supramolecular bulk materials composed of low-molecular-weight compounds offer a promising pathway toward sustainable materials. However, achieving a macroscopic structural order and tuneable mechanical properties without relying on covalently bonded macromolecular components remains a significant challenge. We develop a supramolecular material derived from …

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Precise Synthesis and Liquid Crystallinity of Poly(alkylene 4,4'-bibenzoate)-Based Oligomers and Alternating Copolyesters

下村 祥通, Yoshimichi Shimomura, Atsuya Kawamura, Takashi Kajitani et autres

Precise Synthesis and Liquid Crystallinity of Poly(Alkylene 4,4'‐bibenzoate)‐Based Oligomers and Alternating Copolyesters

Yoshimichi Shimomura, Atsuya Kawamura, Yuki Sawatari, Takashi Kajitani et autres

ABSTRACT Poly(alkylene 4,4'‐bibenzoate)s ( BB‐ n ), a class of semi‐flexible main‐chain thermotropic liquid‐crystalline polyesters (TLCPs), exhibit well‐defined and thermally stable smectic A or C A phases and have therefore been widely investigated. BB‐ n are typically synthesized via polycondensation of 4,4'‐bibenzoate …

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YhbO is a DJ-1 family glyoxalase and α-oxoaldehyde hydratase that confers resistance to reactive carbonyl stress

Aiko Watanabe, Kai Kanematsu, Yohei Hizukuri, Tatsuki Hori et autres

Reactive α-oxoaldehydes, such as glyoxal (GO) and methylglyoxal (MGO), are cytotoxic glycolysis byproducts that induce cellular dysfunction by nonenzymatically modifying diverse macromolecules. Although DJ-1 (PARK7), a protein linked to Parkinson's disease, acts as a type-III glyoxalase/methylglyoxalase, the physiological function(s) of its prokaryotic …

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Metastable azobenzene nanotoroids as kinetic reservoirs for seeded and photoinduced gelation

Natsuki Suda, Sougata Datta, Hiroki Hanayama, Takashi Kajitani et autres

Abstract Cyclic molecules and supramolecular assemblies play important roles in both covalent and supramolecular polymerization because their distinctive topology eliminates chain ends and thereby suppresses one-dimensional elongation pathways. Here we show that larger, mesoscopic cyclic supramolecular assemblies function as off-pathway kinetic traps …

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Fibers and Double‐Layered Tubes Formed From a Single Self‐Complementary DNA Oligonucleotide

So Shirai, Tetsunao Makino, Takashi Kajitani, Makiko Tanaka

ABSTRACT This study reports the first observation that a short self‐complementary DNA oligonucleotide can self‐assemble into two distinct liquid‐crystalline architectures—long fibers and double‐layered molecular tubes—upon thermal annealing. These two morphologies are determined by depletion forces tuned by the concentration of poly(ethylene glycol) …

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Fibers and Double‐Layered Tubes Formed From a Single Self‐Complementary DNA Oligonucleotide

So Shirai, Tetsunao Makino, Takashi Kajitani, Makiko Tanaka

ABSTRACT This study reports the first observation that a short self‐complementary DNA oligonucleotide can self‐assemble into two distinct liquid‐crystalline architectures—long fibers and double‐layered molecular tubes—upon thermal annealing. These two morphologies are determined by depletion forces tuned by the concentration of poly(ethylene glycol) …

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Engineering Robust Supramolecular Nanoassemblies from Amino‐Acid Functionalized Stiff‐Stilbene Amphiphiles

Khloe Shuk‐Ying Kwan, Ming‐Hin Chau, Wai‐Ki Wong, Takashi Kajitani et autres

The unique functional properties and remarkable structural stability of proteins under extreme environments and conditions are largely predetermined by their constituent amino acid groups. However, the specific influence of molecular interactions arising from individual amino acids on overall structural stability of the …

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Folding-Mediated Self-Assembly of Sterically Demanding π-Luminophore Dyads into Nanotubes Exhibiting Multidirectional Exciton Transport

Takumi Aizawa, Hironari Arima, Sota Mihara, Takahiro Ueno et autres

The hierarchical self-assembly of folded proteins into functional nanostructures has long served as a conceptual foundation for designing synthetic polymer systems. However, the efficacy of folding-based strategies in small-molecule assemblies remains largely unproven. Here we show that sterically demanding, highly emissive diphenylanthracene …

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Emergence of Anisotropic Subcompartments via Coassembly of Hierarchically Ordered G-Quadruplexes and Fluid Polylysine in Droplet-Based Compartments

Hiroka Sugai, Shunsuke Tomita, Mariko Toyoda, Kota Watanuki et autres

High Resolution Image Download MS PowerPoint Slide Liquid–liquid phase separation (LLPS) plays a key role in cellular organization, enabling the formation of dynamic compartments that provide spatial and temporal control over biochemical processes. Although LLPS systems are typically fluidic, recent studies have …

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Cholesterol-Based Molecular Glasses: Attempts to Control Their Thermal Stability and Mechanical Properties

Kazuki Muro, Yuichiro Watanabe, Chia-Hsin Cheng, Takashi Kajitani et autres

Driven by environmental concerns regarding conventional polymer-based materials, biomolecule-derived bulk solids, such as glasses and plastics, are attracting increasing attention. Here, we report molecular glasses consisting of a hydrophobic cholesterol scaffold. By designing intermolecular hydrogen bonding, crystallization was suppressed; however, the glassy …

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Author response for "Linear and branched supramolecular polymers formed from isomeric monomers as revealed by solution viscoelasticity"

Yufuka Furukawa, Ren Sato, Natsumi Fukaya, Takashi Kajitani et autres