J‐Aggregation‐Driven Supramolecular Assembly of Dye‐Conjugated Block Polymers: From Morphological Tailoring to Anticancer Applications

2021 ◽  
pp. 2105189
Author(s):  
Shuoxin Li ◽  
Xiaosa Yan ◽  
Junqing Zhang ◽  
Xia Guo ◽  
Yongkang Zhang ◽  
...  
2010 ◽  
Vol 6 (9) ◽  
pp. 1662 ◽  
Author(s):  
Jennifer S. Haghpanah ◽  
Carlo Yuvienco ◽  
Eric W. Roth ◽  
Alice Liang ◽  
Raymond S. Tu ◽  
...  

2011 ◽  
Vol 1301 ◽  
Author(s):  
Min Dai ◽  
Jennifer S. Haghpanah ◽  
Carlo Yuvienco ◽  
Jin Kim Montclare

ABSTRACTWe describe the biosynthesis and characterization of protein materials comprised of two distinct self-assembling domains (SADs): elastin (E) found in tissue for its elastic properties and cartilage oligomeric matrix protein coiled-coil (COMPcc, C) predominantly locatedin joint and in bones. Based on earlier studies on protein block polymers comprised these two SADs, orientation and number of blocks play a crucial role in the overall stimuli-responsive supramolecular assembly behavior. Here we fabricate a range of EnC and CEn block polymers in which the E domain is systematically truncated to explore the effects of the E domain on the overall physicochemical behavior.


Author(s):  
U. Aebi ◽  
R. Millonig ◽  
H. Salvo

To date, most 3-D reconstructions of undecorated actin filaments have been obtained from actin filament paracrystal data (for refs, see 1,2). However, due to the fact that (a) the paracrystals may be several filament layers thick, and (b) adjacent filaments may sustantially interdigitate, these reconstructions may be subject to significant artifacts. None of these reconstructions has permitted unambiguous tracing or orientation of the actin subunits within the filament. Furthermore, measured values for the maximal filament diameter both determined by EM and by X-ray diffraction analysis, vary between 6 and 10 nm. Obviously, the apparent diameter of the actin filament revealed in the EM will critically depend on specimen preparation, since it is a rather flexible supramolecular assembly which can easily be bent or distorted. To resolve some of these ambiguities, we have explored specimen preparation conditions which may preserve single filaments sufficiently straight and helically ordered to be suitable for single filament 3-D reconstructions, possibly revealing molecular detail.


2020 ◽  
Author(s):  
Ian Colliard ◽  
Gregory Morrosin ◽  
Hans-Conrad zur Loye ◽  
May Nyman

Superatoms are nanometer-sized molecules or particles that can form ordered lattices, mimicking their atomic counterparts. Hierarchical assembly of superatoms gives rise to emergent properties in superlattices of quantum-dots, p-block clusters, and fullerenes. Here, we introduce a family of uranium-oxysulfate cluster anions whose hierarchical assembly in water is controlled by two parameters; acidity and the countercation. In acid, larger Ln<sup>III</sup> (Ln=La-Ho) link hexamer (U<sub>6</sub>) oxoclusters into body-centered cubic frameworks, while smaller Ln<sup>III</sup> (Ln=Er-Lu &Y) promote linking of fourteen U<sub>6</sub>-clusters into hollow superclusters (U<sub>84</sub> superatoms). U<sub>84</sub> assembles into superlattices including cubic-closest packed, body-centered cubic, and interpenetrating networks, bridged by interstitial countercations, and U<sub>6</sub>-clusters. Divalent transition metals (TM=Mn<sup>II </sup>and Zn<sup>II</sup>), with no added acid, charge-balance and promote the fusion of 10 U<sub>6</sub> and 10 U-monomers into a wheel–shaped cluster (U<sub>70</sub>). Dissolution of U<sub>70</sub> in organic media reveals (by small-angle Xray scattering) that differing supramolecular assemblies are accessed, controlled by TM-linking of U<sub>70</sub>-clusters. <br>


Biology ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 294
Author(s):  
Thunyarat Surasiang ◽  
Chalongrat Noree

Asparagine synthetase deficiency (ASD) has been found to be caused by certain mutations in the gene encoding human asparagine synthetase (ASNS). Among reported mutations, A6E mutation showed the greatest reduction in ASNS abundance. However, the effect of A6E mutation has not yet been tested with yeast asparagine synthetase (Asn1/2p). Here, we constructed a yeast strain by deleting ASN2 from its genome, introducing the A6E mutation codon to ASN1, along with GFP downstream of ASN1. Our mutant yeast construct showed a noticeable decrease of Asn1p(A6E)-GFP levels as compared to the control yeast expressing Asn1p(WT)-GFP. At the stationary phase, the A6E mutation also markedly lowered the assembly frequency of the enzyme. In contrast to Asn1p(WT)-GFP, Asn1p(A6E)-GFP was insensitive to changes in the intracellular energy levels upon treatment with sodium azide during the log phase or fresh glucose at the stationary phase. Our study has confirmed that the effect of A6E mutation on protein expression levels of asparagine synthetase is common in both unicellular and multicellular eukaryotes, suggesting that yeast could be a model of ASD. Furthermore, A6E mutation could be introduced to the ASNS gene of acute lymphoblastic leukemia patients to inhibit the upregulation of ASNS by cancer cells, reducing the risk of developing resistance to the asparaginase treatment.


2021 ◽  
Author(s):  
Eric R. Williams ◽  
Paige L. McMahon ◽  
Joseph Reynolds III ◽  
Jonathan L Snider ◽  
Vitalie Stavila ◽  
...  

Porous nanoscale carbonaceous materials are widely employed for catalysis, separations, and electrochemical devices where device performance often relies upon specific and well-defined regular feature sizes. The use of block polymers...


2021 ◽  
Author(s):  
Anurag Mukherjee ◽  
Suhrit Ghosh

Naphthalene-diimide (NDI) derived building blocks have been explored extensively for supramolecular assembly as they exhibit attractive photophysical properties, suitable for applications in organic optoelectronics. Core-substituted derivatives of the NDI chromophore (cNDI) differ significantly from the parent NDI dye in terms of optical and redox properties. Adequate molecular engineering opportunities and substitution-dependent tunable optoelectronic properties make cNDI derivatives highly promising candidates for supramolecular assembly and functional material. This short review discusses recent development in the area of functional supramolecular assemblies based on cNDIs and related molecules.


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