Synthesis of a Library of Fucosylated Glycoclusters and Determination of their Binding toward Pseudomonas aeruginosa Lectin B (PA-IIL) Using a DNA-Based Carbohydrate Microarray
16 fucosylated glycoclusters with antenna-like, linear, or crown-like spatial arrangements were synthesized using a combination of DNA solid-phase synthesis and alkyne azide 1,3-dipolar cycloaddition (CuAAC). Their binding properties toward PA-IIL were then evaluated based on DNA directed immobilization (DDI) carbohydrate microarray. Our results suggested that the antenna-like scaffold was preferred
Two galactosylated glycoclusters show high affinity for LecA fromPseudomonas aeruginosaand anti-biofilm activity.
两个半乳糖基糖团对来自铜绿假单胞菌的LecA具有很高的亲和力,并具有抗生物膜活性。
Modified Galacto‐ or Fuco‐Clusters Exploiting the Siderophore Pathway to Inhibit the LecA‐ or LecB‐Associated Virulence of<i>Pseudomonas aeruginosa</i>
AbstractGalacto‐ and fuco‐clusters conjugated with one to three catechol or hydroxamate motifs were synthesised to target LecA and LecB lectins of Pseudomonas aeruginosa (PA) localised in the outer membrane and inside the bacterium. The resulting glycocluster–pseudosiderophore conjugates were evaluated as Trojan horses to cross the outer membrane of PA by iron transport. The data suggest that glycoclusters with catechol moieties are able to hijack the iron transport, whereas those with hydroxamates showed strong nonspecific interactions. Mono‐ and tricatechol galactoclusters (G1C and G3C) were evaluated as inhibitors of infection by PA in comparison with the free galactocluster (G0). All of them exhibited an inhibitory effect between 46 to 75 % at 100 μM, with a higher potency than G0. This result shows that LecA localised in the outer membrane of PA is involved in the infection mechanism.
Synthesis of branched-phosphodiester and mannose-centered fucosylated glycoclusters and their binding studies with Burkholderia ambifaria lectin (BambL)
their ability to bind to Burkholderia ambifaria Lectin (BambL). Bindingevaluation was performed through inhibition of hemagglutination (HIA), surface plasmon resonance (SPR) and isothermal titration microcalorimetry (ITC). All fucosylated glycoclusters exhibited a higher affinity to BambL than methyl α-L-fucoside. A dissociation constant of 43 nM was observed for the fucocluster exhibiting four residues
Oxidative DNA Cleavage with Clip‐Phenanthroline Triplex‐Forming Oligonucleotide Hybrids
作者:Alessandro Panattoni、Afaf H. El‐Sagheer、Tom Brown、Andrew Kellett、Michal Hocek
DOI:10.1002/cbic.201900670
日期:2020.4
time, conditions and amounts of ascorbate were studied, and optimum conjugates and a procedure that gave reasonably efficient (up to 34 %) cleavage of the target sequence, while rendering an off-target dsDNA intact, were found. The footprint of cleavage on PAGE was identified only in one case, with low conversion; this means that cleavage does not proceed with single nucleotide precision. On the other