Hydrogen Bonding

Publication Title: 
Homeopathy: The Journal of the Faculty of Homeopathy

Homeopathic medicines are currently used in medical practice, despite controversy about their effectiveness. The preparation method is based on extremely high dilutions of many substances in water, far beyond any detectable level. For this reason, it has been suggested that water could retain a 'memory' of substances that have been dissolved in it before the successive dilutions. The paper stresses the fact that this idea is not compatible with our knowledge of pure water.

Author(s): 
Teixeira, Jose
Publication Title: 
Journal of Biomolecular Structure & Dynamics

The emergence of bacterial multidrug resistance is an increasing problem in treatment of infectious diseases. An important cause for the multidrug resistance of bacteria is the expression of multidrug efflux transporters. The multidrug and toxic compound extrusion (MATE) transporters are most recently recognized as unique efflux system for extrusion of antimicrobials and therapeutic drugs due to energy stored in either Na(+) or H(+) electrochemical gradient.

Author(s): 
Kesherwani, Manish
Michael Gromiha, M.
Fukui, Kazuhiko
Velmurugan, Devadasan
Publication Title: 
Journal of Molecular Biology
Author(s): 
Air, G. M.
Blackburn, E. H.
Coulson, A. R.
Galibert, F.
Sanger, F.
Sedat, J. W.
Ziff, E. B.
Publication Title: 
Cell

Structural properties of DNA oligonucleotides corresponding to the single-stranded molecular terminus of telomeres from several organisms were analyzed. Based on physical studies including nondenaturing polyacrylamide gel electrophoresis, absorbance thermal denaturation analysis, and 1H and 31P nuclear magnetic resonance spectroscopy, we conclude that these molecules can self-associate by forming non-Watson-Crick, guanine.guanine based-paired, intramolecular structures.

Author(s): 
Henderson, E.
Hardin, C. C.
Walk, S. K.
Tinoco, I.
Blackburn, E. H.
Publication Title: 
Cell

Structural properties of DNA oligonucleotides corresponding to the single-stranded molecular terminus of telomeres from several organisms were analyzed. Based on physical studies including nondenaturing polyacrylamide gel electrophoresis, absorbance thermal denaturation analysis, and 1H and 31P nuclear magnetic resonance spectroscopy, we conclude that these molecules can self-associate by forming non-Watson-Crick, guanine.guanine based-paired, intramolecular structures.

Author(s): 
Henderson, E.
Hardin, C. C.
Walk, S. K.
Tinoco, I.
Blackburn, E. H.
Publication Title: 
Journal of Molecular Biology
Author(s): 
Air, G. M.
Blackburn, E. H.
Coulson, A. R.
Galibert, F.
Sanger, F.
Sedat, J. W.
Ziff, E. B.
Publication Title: 
PloS One

In this study, we investigated the influence of single nucleotide polymorphisms on the conformation of mutated cytochrome P450 (CYP) 2B6 proteins using molecular dynamics (MD) simulation. Some of these mutations influence drug metabolism activities, leading to individual variations in drug efficacy and pharmacokinetics. Using computational docking, we predicted the structure of the complex between the antimalarial agent artemether and CYP2B6 whose conformations were obtained by MD simulation.

Author(s): 
Kobayashi, Kana
Takahashi, Ohgi
Hiratsuka, Masahiro
Yamaotsu, Noriyuki
Hirono, Shuichi
Watanabe, Yurie
Oda, Akifumi
Publication Title: 
PloS One

Limited structural information of drug targets, cellular toxicity possessed by lead compounds, and large amounts of potential leads are the major issues facing the design-oriented approach of discovering new leads. In an attempt to tackle these issues, we have developed a process of virtual screening based on the observation that conformational rearrangements of the dengue virus envelope protein are essential for the mediation of viral entry into host cells via membrane fusion.

Author(s): 
Yang, Jinn-Moon
Chen, Yan-Fu
Tu, Yu-Yin
Yen, Kuei-Rong
Yang, Yun-Liang
Publication Title: 
FEBS letters

Recent experimental study found that OLE (olive leaf extract) has anti-HIV activity by blocking the HIV virus entry to host cells [Lee-Huang, S., Zhang, L., Huang, P.L., Chang, Y. and Huang, P.L. (2003) Anti-HIV activity of olive leaf extract (OLE) and modulation of host cell gene expression by HIV-1 infection and OLE treatment. Biochem. Biophys. Res. Commun. 307, 1029; Lee-Huang, S., Huang, P.L., Zhang, D., Lee, J.W., Bao, J., Sun, Y., Chang, Y.-Tae, Zhang, J.Z.H. and Huang, P.L. (2007) Discovery of small-molecule HIV-1 fusion and integrase inhibitors oleuropein and hydroxytyrosol.

Author(s): 
Bao, J.
Zhang, D. W.
Zhang, J. Z. H.
Huang, P. Lee
Huang, P. Lin
Lee-Huang, S.
Publication Title: 
International Journal of Oncology

Ginsenoside compound K (C-K) is an intestinal microbiota metabolite of ginsenoside Rb1, a major constituent in American ginseng. However, previous ginseng anti-cancer observations were largely focused on ginseng parent compounds but not metabolites, and anti-colorectal cancer studies on C-K were limited. This study investigated the anti-proliferative effects of C-K when compared to those of Rb1, and the related mechanisms of action, in HCT-116 and SW-480 colorectal cancer cells.

Author(s): 
Wang, Chong-Zhi
Du, Guang-Jian
Zhang, Zhiyu
Wen, Xiao-Dong
Calway, Tyler
Zhen, Zhong
Musch, Mark W.
Bissonnette, Marc
Chang, Eugene B.
Yuan, Chun-Su

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