Manganese(I) tricarbonyl complexes: UV-dependent antioxidant activity, electrochemistry, and DFT/TDDFT calculation

Synthesis, Biological Activities, DFT Calculations, and Molecular Docking Studies of O-Methyl-Inositols

The concise synthesis of O-methyl-d-inositol derivative and conduritol derivatives was obtained starting from p-benzoquinone. Spectroscopic methods have been performed for the characterization of newly synthesized compounds. Cyclitols are useful molecules with anticancer, antibiotic, antinutrient, and antileukemic activities. Inositol class molecules, known as the most important cyclitol derivatives, were examined in this study for their 1,1-diphenyl-2-picrylhydrazyl (DPPH) and nitric oxide radical scavenging and butyrylcholinesterase (BChE) and glycosidase inhibition activities. It was observed that compound 5, in particular, showed efficacy that competed with the standards in terms of both antioxidant activity and enzyme inhibitor potential. Additionally, compound 5 shows effective antimicrobial activity. The water-soluble characteristics and lipophilic properties of the compounds were also considered and discussed. Moreover, the quantum chemical analyses were performed in light of the DFT/B3LYP/6-311G** level computations to elucidate/compare the studied inositols' possible reactivity directions. Additionally, the interactions of the molecules were analyzed against acetylcholinesterase (AChE), peroxiredoxin 5, and DNA gyrase by molecular docking methods. Cholinesterase inhibitors have an important status as the most important drug group used in the treatment of Alzheimer's disease today. Considering the effects of inhibition of the α-glucosidase enzyme by inhibitors, such molecules can also be used as therapeutic components in the treatment of diabetes.

Revealing the antioxidant properties of alkyl gallates: a novel approach through quantum chemical calculations and molecular docking

CONTEXT

This study investigates the antioxidant potential of alkyl gallates (C1-C10), focusing on the impact of alkyl chain length and solvent polarity on their antioxidant properties. Known for their biomedical relevance in mitigating oxidative stress, alkyl gallates' structure-activity relationships, particularly regarding chain length and environmental factors, still need to be explored. Key thermochemical parameters, including bond dissociation enthalpy (BDE), ionization potential (IP), proton affinity (PA), and electron transfer enthalpy (ETE), reveal that shorter alkyl chains (C1-C4) exhibit superior antioxidant activity. In contrast, longer chains (C5-C10) show reduced effectiveness due to steric hindrance and lower solubility in polar solvents. Molecular docking studies also demonstrated favorable binding interactions with vital biological targets, further reinforcing their antioxidant potential.

METHODS

Quantum chemical calculations were performed using Gaussian 16 with the B3LYP/6-311G(dp) basis set for geometry optimizations. Solvent effects were modeled using the integral equation formalism-polarized continuum model (IEF-PCM). Molecular docking studies were conducted using AutoDockTools 4.2, targeting Tyrosine Kinase Hck, Heme Oxygenase, and Human Serum Albumin to evaluate fundamental binding interactions. These computational methods provided insights into alkyl gallates' chemical reactivity and antioxidant efficiency, allowing for the rational design of more potent antioxidant compounds.

A simple theoretical approach to converging of Myoglobin-Assay with different pH values

Many metal carbonyl complexes have been synthesized and analyzed as CO-releasing agents. As in many bioactivity assays, differences between in-vitro and in-vivo studies in Myoglobin Assay have been observed. Adjustment of in-vitro conditions to in-vivo conditions is one way to overcoming this problem. Changing the conditions of each in-vivo assay is not possible considering the available grant, material, and labor facilities. In-silico methods are suitable as they provide better in-vitro conditions before experimental procedures. A method which is easy to employ on a basic computer could be more suitable to observe the assay convergence. In this study, global reactivity descriptors were used as an approach to investigate pH differences in myoglobin assay. Global reactivity descriptors of the molecules were compared with myoglobin assay results at different pH values and molecular docking results performed with optimized molecules in different solvents. The following complexes were studied: [Mn(CO)3(bpy)(L)]PF6 (bpy: 2,2-bipyridyl, L: benzylbenzimidazole, 4-chlorobenzylbenzimidazole).