Fabio Pichierri

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Molecular recognition plays a central role in many biological processes. For enzymatic reactions and slow protein–protein recognition events, turn-over rates and on-rates in the millisecond-to-second time scale have been connected to internal protein dynamics detected with atomic resolution by NMR spectroscopy, and in particular conformational sampling(More)
The low volatility and thermal instability made the photoelectron (PE), electron transmission (ET), and dissociative electron attachment (DEA) spectroscopy measurements on curcumin (a potent chemopreventive agent) unsuccessful. The filled and empty electronic structure of curcumin was therefore investigated by exploiting the PES, ETS, and DEAS results for(More)
 A PtII complex containing N4 bound neutral 1-methylcytosine (1-MeC), trans–[Pt(NH3)2(1-MeC-N4)2](ClO4)2 (5), has been prepared and characterized by X-ray analysis. The complex contains the rare iminooxo tautomer form of the cytosine nucleobase. PtII binding is through the exocyclic N4 position of the nucleobases, with Pt and the N3 positions in a syn(More)
Structural data of protein-DNA complex show redundancy and flexibility in base-amino acid interactions. To understand the origin of the specificity in protein-DNA recognition, we calculated the interaction free energy, enthalpy, entropy, and minimum energy maps for AT-Asn, GC-Asn, AT-Ser, and GC-Ser by means of a set of ab initio force field with extensive(More)
The aromatic pathways and the degree of aromaticity of expanded porphyrins have been determined by explicit calculations of the routes and strengths of the magnetically induced currents using the gauge-including magnetically induced current (GIMIC) approach. Density functional theory calculations show that the doubly twisted hexaphyrins fulfilling Hückel's(More)
Density functional theory calculations at the PBE1PBE/DGDZVP level of theory were performed to investigate the mechanism and chemoselectivity of Pd(II)-catalyzed allylation of aldehydes. The transfer of formaldehyde to the pi-allyl group of bis-pi-allylpalladium complex is a thermodynamically favored process (DeltaG = -1.4 kcal/mol), and its Gibbs free(More)
C-Hydroxylated carboranes, carboranols, have interesting properties resulting from their hydroxyl protons being highly acidic because of the electron-deficient nature of the carborane cage. We described here an efficient synthesis of C-hydroxycarboranes 2 and C,C'-dihydroxycarboranes 3 by the reaction of carboranyl lithium and trimethylborate, followed by(More)
The equilibrium molecular structure of the octatetranyl anion, C8H(-), which has been recently detected in two astronomical environments, is investigated with the aid of both ab initio post-Hartree-Fock and density functional theory (DFT) calculations. The model chemistry adopted in this study was selected after a series of benchmark calculations performed(More)
The electronic structure of human erythropoietin (HuEPO) has been investigated with the aid of quantum mechanical calculations. The results indicate that the protein is highly polarized and its permanent dipole moment has a magnitude of 471 D. The HOMO of HuEPO is localized on Trp51, which stays in close proximity to Met54. Three oxidation-resistant mutants(More)
A study on the interaction between a phosphotyrosyl peptide with the SH2 domain of Lck kinase has been undertaken with the aid of semiempirical linear-scaling quantum mechanical methods. The structure of this complex has been solved at atomic resolution and, hence, it represents the ideal candidate for studying the charge deformation effects induced by the(More)