Halogen bonding--a novel interaction for rational drug design?
Although recognized in small molecules for quite some time, the implications of halogen bonding in biomolecular systems are only now coming to light. In this study, several systems of proteins in complex with halogenated ligands have been investigated by using a two-layer QM/MM ONIOM methodology. In all cases, the halogen-oxygen distances are shown to be much less than the van der Waals radius sums. Single-point energy calculations unveil that the interaction becomes comparable in magnitude to classical hydrogen bonding. Furthermore, we found that the strength of the interactions attenuates in the order H approximately I > Br > Cl. These results agree well with the characteristics discovered within small model halogen-bonded systems. A detailed analysis of the interactions reveals that halogen bonding interactions are responsible for the different conformation of the molecules in the active site. This study would help to establish such interaction as a potential and effective tool in the context of drug design.
Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. lu_yunxiang@163.com
Yunxiang
Y
Lu
Ting
T
Shi
Yong
Y
Wang
Huaiyu
H
Yang
Xiuhua
X
Yan
Xiaoming
X
Luo
Hualiang
H
Jiang
Weiliang
W
Zhu
D020134:Catalytic Domain; D003198:Computer Simulation; D018360:Crystallography, X-Ray; D015195:Drug Design; D006219:Halogens / Q000737:chemistry*; D006801:Humans; D008024:Ligands; D008958:Models, Molecular; D011485:Protein Binding; D047428:Protein Kinase Inhibitors / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D011494:Protein Kinases / Q000737:chemistry / Q000378:metabolism; D011506:Proteins / Q000737:chemistry / Q000378:metabolism; D055672:Static Electricity
D006219:Halogens; D008024:Ligands; D047428:Protein Kinase Inhibitors; D011506:Proteins; D011494:Protein Kinases