Abstract:Crystal structures of two symmetrically substituted thiourea derivatives, 1,3-dibenzylthiourea, CIsHI6N2S (DBTU), and 1,3-dicyclohexylthiourea, CI3H24N2S t Visiting Post Doctoral Research Fellow, School of Physics, University Sains Malaysia, Malaysia.
“…In these interactions, there is strong charge transfer from the lone pairs of N1 and N5 to the π* orbital of the C3‘−S4‘ bond, and this transfer becomes even stronger when there is a complexation with the K101. There are various crystallographic studies showing the presence of N−H···S hydrogen bonds in thiourea-derived compounds, − as well as theoretical studies analyzing the ability of the sulfur atom to act as proton acceptor. − Nevertheless, this is the first time that the presence of the hydrogen bond is reported to be involved in the stabilization of the TIBO inhibitor with K101. 7 …”
Section: Resultsmentioning
confidence: 99%
“…45 In these interactions, there is strong charge transfer from the lone pairs of N1 and N5 to the π* orbital of the C3′-S4′ bond, and this transfer becomes even stronger when there is a complexation with the K101. There are various crystallographic studies showing the presence of N-H‚‚‚S hydrogen bonds in thioureaderived compounds, [61][62][63][64][65][66][67][68] as well as theoretical studies analyzing…”
The non-nucleoside inhibitors of HIV-1 reverse transcriptase (NNRTIs) are an important class of drugs employed in anti-HIV chemotherapy. TIBO compounds, which belong to the NNRTIs class, are potent inhibitors of the HIV-1 reverse transcriptase enzyme (HIV-1 RT). However, mutations in the amino acids present in the active site of these inhibitors limit their clinical use. In this work, the intermolecular interactions taking place between compounds of the TIBO family and Y181 (C181), K101, and Y188 amino acids are investigated. For this purpose the coordinates of three RT crystalline structures complexed with TIBO were taken from PDB database, and were analyzed by means of the B3LYP/6-31+G(d,p) model. The natural bond orbital (NBO) and atoms in molecules (AIM) methods indicate that not only does the Y181C mutation lead to loss of favorable interactions between the TIBO side chains and tyrosine, but it also affects the interaction between the inhibitor and K101 and Y188. Results also revealed that the interaction between TIBO and K101 is stabilized by N-H...O and N-H...S hydrogen bonds. This is the first time that the presence of the latter hydrogen bond (N-H...S) is reported to play an important role in the stabilization of the interaction between TIBO and K101. In addition the NBO and natural population analyses (NPA) indicate that the 8 Cl-TIBO inhibitor presents a more effective interaction with the Y181, K101, and Y188 than that of 9 Cl-TIBO.
“…In these interactions, there is strong charge transfer from the lone pairs of N1 and N5 to the π* orbital of the C3‘−S4‘ bond, and this transfer becomes even stronger when there is a complexation with the K101. There are various crystallographic studies showing the presence of N−H···S hydrogen bonds in thiourea-derived compounds, − as well as theoretical studies analyzing the ability of the sulfur atom to act as proton acceptor. − Nevertheless, this is the first time that the presence of the hydrogen bond is reported to be involved in the stabilization of the TIBO inhibitor with K101. 7 …”
Section: Resultsmentioning
confidence: 99%
“…45 In these interactions, there is strong charge transfer from the lone pairs of N1 and N5 to the π* orbital of the C3′-S4′ bond, and this transfer becomes even stronger when there is a complexation with the K101. There are various crystallographic studies showing the presence of N-H‚‚‚S hydrogen bonds in thioureaderived compounds, [61][62][63][64][65][66][67][68] as well as theoretical studies analyzing…”
The non-nucleoside inhibitors of HIV-1 reverse transcriptase (NNRTIs) are an important class of drugs employed in anti-HIV chemotherapy. TIBO compounds, which belong to the NNRTIs class, are potent inhibitors of the HIV-1 reverse transcriptase enzyme (HIV-1 RT). However, mutations in the amino acids present in the active site of these inhibitors limit their clinical use. In this work, the intermolecular interactions taking place between compounds of the TIBO family and Y181 (C181), K101, and Y188 amino acids are investigated. For this purpose the coordinates of three RT crystalline structures complexed with TIBO were taken from PDB database, and were analyzed by means of the B3LYP/6-31+G(d,p) model. The natural bond orbital (NBO) and atoms in molecules (AIM) methods indicate that not only does the Y181C mutation lead to loss of favorable interactions between the TIBO side chains and tyrosine, but it also affects the interaction between the inhibitor and K101 and Y188. Results also revealed that the interaction between TIBO and K101 is stabilized by N-H...O and N-H...S hydrogen bonds. This is the first time that the presence of the latter hydrogen bond (N-H...S) is reported to play an important role in the stabilization of the interaction between TIBO and K101. In addition the NBO and natural population analyses (NPA) indicate that the 8 Cl-TIBO inhibitor presents a more effective interaction with the Y181, K101, and Y188 than that of 9 Cl-TIBO.
“…The S atom does not act as an acceptor of hydrogen bonds as it does in other structures including the thiourea moiety (Ramnathan et al, 1996;Steiner, 1998;Shanmuga Sundara Raj et al, 1999;West et al, 1999). In the present structure, atom O1 is the only acceptor and is involved in two NÐHÁ Á ÁO hydrogen bonds.…”
The crystal structure of the title compound, C21H21N2O3PS, is reported. In the structure, centrosymmetrically related molecules are linked by N—H⋯O hydrogen bonds and form dimers. The geometry around the P atom indicates a distorted tetrahedron.
New complexes of a sterically hindered thiourea, [M(dchtu) 2 Cl 2 ] (M ϭ Co 1, Ni 2), [Zn(dchtu) 2 (NCS) 2 ] (3) and [Pb(dchtu) 6 ](SCN) 2 · 2C 2 H 5 OH (4) (dchtu ϭ N,NЈ-dicyclohexylthiourea), have been synthesized and characterized. The single crystal structures of 1, 3 and 4 have been determined by single crystal Xray diffraction analyses. Co II , Ni II , and Zn II form 1: 2 compounds with dchtu even if molar excesses of dchtu is used, while Pb II forms 1:6 compound under the same conditions. The dchtu acts as a monodenate S-donor ligand in all the complexes. Co II and Zn II atoms 2059 are tetrahedrally coordinated with two dchtu ligands, and two chloride or isothiocyanate ions, respectively. The Pb II ion in 4 forms an octahedral coordination sphere with six dchtu ligands. The structures of the complexes are stabilized by a system of intermolecular H-bonding.
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