4 research outputs found
Role of Group 12 Metals in the Reduction of H<sub>2</sub>O<sub>2</sub> by Santi’s Reagent: A Computational Mechanistic Investigation
PhSeZnCl, which is also known as Santi’s reagent,
can catalyze
the reduction of hydrogen peroxide by thiols with a GPx-like mechanism.
In this work, the first step of this catalytic cycle, i.e., the reduction
of H2O2 by PhSeZnCl, is investigated in silico using state-of-the-art density functional theory
calculations. Then, the role of the metal is evaluated by replacing
Zn with its group 12 siblings (Cd and Hg). The thermodynamic and kinetic
factors favoring Zn are elucidated. Furthermore, the role of the halogen
is considered by replacing Cl with Br in all three metal compounds,
and this turns out to be negligible. Finally, the overall GPx-like
mechanism of PhSeZnCl and PhSeZnBr is discussed by evaluating the
energetics of the mechanistic path leading to the disulfide product
Synthesis of a Structural Analogue of the Repeating Unit from <i>Streptococcus pneumoniae</i> 19F Capsular Polysaccharide Based on the Cross-Metathesis–Selenocyclization Reaction Sequence
Pseudo-oligosaccharides
have attracted much interest as scaffolds
for the synthesis of sugar mimics endowed with very similar biological
properties but structurally and synthetically simpler than their natural
counterparts. Herein, the synthesis of pseudo-oligosaccharides using
the cross-metathesis reaction between distinct sugar-olefins followed
by intramolecular selenocyclization of the obtained heterodimer as
key steps is first investigated. This methodology has been then applied
to the preparation of structural analogues of the trisaccharide repeating
unit from <i>Streptococcus pneumoniae</i> 19F. The inhibition
abilities of the synthetic molecules were evaluated by a competitive
ELISA assay using a rabbit polyclonal anti-19F serum
Synthesis of a Structural Analogue of the Repeating Unit from <i>Streptococcus pneumoniae</i> 19F Capsular Polysaccharide Based on the Cross-Metathesis–Selenocyclization Reaction Sequence
Pseudo-oligosaccharides
have attracted much interest as scaffolds
for the synthesis of sugar mimics endowed with very similar biological
properties but structurally and synthetically simpler than their natural
counterparts. Herein, the synthesis of pseudo-oligosaccharides using
the cross-metathesis reaction between distinct sugar-olefins followed
by intramolecular selenocyclization of the obtained heterodimer as
key steps is first investigated. This methodology has been then applied
to the preparation of structural analogues of the trisaccharide repeating
unit from <i>Streptococcus pneumoniae</i> 19F. The inhibition
abilities of the synthetic molecules were evaluated by a competitive
ELISA assay using a rabbit polyclonal anti-19F serum
Design and Synthesis of DiselenoBisBenzamides (DISeBAs) as Nucleocapsid Protein 7 (NCp7) Inhibitors with anti-HIV Activity
The
interest in the synthesis of Se-containing compounds is growing with
the discovery of derivatives exhibiting various biological activities.
In this manuscript, we have identified a series of 2,2′-diselenobisbenzamides
(DISeBAs) as novel HIV retroviral nucleocapsid protein 7 (NCp7) inhibitors.
Because of its pleiotropic functions in the whole viral life cycle
and its mutation intolerant nature, NCp7 represents a target of great
interest which is not reached by any anti-HIV agent in clinical use.
Using the diselenobisbenzoic scaffold, amino acid, and benzenesulfonamide
derivatives were prepared and biologically profiled against different
models of HIV infection. The incorporation of amino acids such as
glycine and glutamate into DISeBAs <b>7</b> and <b>8</b> resulted in selective anti-HIV activity against both acutely and
chronically infected cells as well as an interesting virucidal effect.
DISeBAs demonstrated broad antiretroviral activity, encompassing HIV-1
drug-resistant strains including clinical isolates, as well as simian
immunodeficiency virus (SIV). Time of addition experiments, along
with the observed dose dependent inhibition of the Gag precursor proper
processing, confirmed that their mechanism of action is based on NCp7
inhibition