Small-molecule and mutational analysis of allosteric Eg5 inhibition by monastrol

Zoltan Maliga¹ and Timothy J Mitchison²

¹MPI-CBG, Pfotenhauer Strasse 108, 01307 Dresden, Germany

²Department of Systems Biology, Harvard Medical School, Boston, Massachusetts, USA

author email corresponding author email

BMC Chemical Biology 2006, 6:2doi:10.1186/1472-6769-6-2


Published:	27 February 2006

Abstract

Background

A recent crystal structure of monastrol in a ternary complex with the kinesin Eg5 motor domain highlights a novel, induced-fit drug binding site at atomic resolution. Mutational obliteration of the monastrol binding site results in a monastrol-resistant, but otherwise catalytically active Eg5 motor domain. However, considering the conformational changes at this site, it is unclear what specific interactions stabilize the interaction between monastrol and the Eg5 motor domain.

Results

To study the molecular complementarity of the monastrol-Eg5 interaction, we used a combination of synthetic chemistry and targeted mutations in Eg5 to measure the contribution of specific contacts to inhibition of Eg5 in vitro and in cultured cells. Structure-activity data on chemical derivatives, sequence analysis of Eg5 homologs from different species, and the effect of mutations near the drug binding site were consistent with the crystal structure.

Conclusion

The mechanism of monastrol revealed by our data rationalizes its specificity for Eg5 over other kinesins and highlights a potential mechanism of drug resistance for anti-cancer therapy targeting this site in Eg5.