The importance of CH/pi hydrogen bonds in rational drug design: An ab initio fragment molecular orbital study to leukocyte-specific protein tyrosine (LCK) kinase.

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Ozawa T, Tsuji E, Ozawa M, Handa C, Mukaiyama H, Nishimura T, Kobayashi S, Okazaki K

The importance of CH/pi hydrogen bonds in rational drug design: An ab initio fragment molecular orbital study to leukocyte-specific protein tyrosine (LCK) kinase.

Bioorg Med Chem. 2008 Dec 15;16(24):10311-8. doi: 10.1016/j.bmc.2008.10.041. Epub 2008 Oct 22.

PubMed ID

18977146 [ View in PubMed

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Abstract

The interaction energy was calculated, by the ab initio FMO method, for complexes between LCK protein and four inhibitors (staurosporine, BMS compound 2, and our compounds 3 and 4). In every case a number of CH/pi hydrogen bonds have been disclosed in the so-called adenine pocket. In complexes of 2, 3, and 4, CH/pi and NH/pi hydrogen bonds have been observed in another pocket. In view of the above results, the aniline ring of 3 was replaced by 2,6-dimethyl aniline to increase the potency for LCK kinase. A 10-fold increase in the potency has been achieved for 4 over 3. We suggest that the concept of weak hydrogen bonds is useful in the rational design of drugs.

DrugBank Data that Cites this Article

Binding Properties

Drug	Target	Property	Measurement	pH	Temperature (°C)
N-(2-chlorophenyl)-5-phenylimidazo[1,5-a]pyrazin-8-amine	Tyrosine-protein kinase Lck	IC 50 (nM)	220	N/A	N/A	Details
N-(2,6-dimethylphenyl)-5-phenylimidazo[1,5-a]pyrazin-8-amine	Tyrosine-protein kinase Lck	IC 50 (nM)	20	N/A	N/A	Details