Loop 5-directed Compounds Inhibit Chimeric Kinesin-5 Motors
Loop 5-directed Compounds Inhibit Chimeric Kinesin-5 Motors
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Loop 5 定向化合物抑制嵌合驱动蛋白 5 马达
DOI:
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发表时间:
2010
影响因子:
4.8
通讯作者:
E. Wojcik
中科院分区:
文献类型:
--
作者:
Liqiong Liu;Sreeja Parameswaran;Jing Liu;Sunyoung Kim;E. Wojcik
The human Eg5 (HsEg5) protein is unique in its sensitivity to allosteric agents even among phylogenetic kin. For example, S-trityl-l-cysteine (STC) and monastrol are HsEg5 inhibitors that bind to a surface pocket created by the L5 loop, but neither compound inhibits the Drosophila Kinesin-5 homologue (Klp61F). Herein we ask whether or not drug sensitivity can be designed into Klp61F. Two chimeric Klp61F motor domains were engineered, bacterially expressed, and purified to test this idea. We report that effector binding can elicit a robust allosteric response comparable with HsEg5 in both motor domain chimeras. Furthermore, isothermal titration calorimetry confirms that the Klp61F chimeras have de novo binding affinities for both STC and monastrol. These data show that the mechanism of intramolecular communication between the three ligand binding sites is conserved in the Kinesin-5 family, and reconstitution of a drug binding cassette within the L5 pocket is sufficient to restore allosteric inhibition. However, the two compounds were not equivalent in their allosteric inhibition. This surprising disparity in the response between the chimeras to monastrol and STC suggests that there is more than one allosteric communication network for these effectors.
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影响因子:
2.9
作者:
DeBonis, S;Simorre, JP;Kozielski, F
通讯作者:
Kozielski, F
影响因子:
2.9
作者:
Wojcik,EdwardJ;Dalrymple,NadineA;Alford,ShannonR;Walker,RichardA;Kim,Sunyoung
通讯作者:
Kim,Sunyoung
影响因子:
7.4
作者:
Freire, Ernesto
通讯作者:
Freire, Ernesto
影响因子:
2.9
作者:
Cochran, Jared C.;Krzysiak, Troy C.;Gilbert, Susan P.
通讯作者:
Gilbert, Susan P.
影响因子:
--
作者:
Maliga, Z;Kapoor, TM;Mitchison, TJ
通讯作者:
Mitchison, TJ