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J Biochem. 2011 Jan;149(1):91-101. doi: 10.1093/jb/mvq122. Epub 2010 Nov 3.

Characterization of a novel rice kinesin O12 with a calponin homology domain.

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  • 1Division of Bioengineering, Graduate School of Engineering, Soka University, Hachioji, Tokyo 192-8577, Japan.


Genomic analysis predicted that the rice (Oryza sativa var. japonica) genome encodes at least 41 kinesin-like proteins including the novel kinesin O12, which is classified as a kinesin-14 family member. O12 has a calponin homology (CH) domain that is known as an actin-binding domain. In this study, we expressed the functional domains of O12 in Escherichia coli and determined its enzymatic characteristics compared with other kinesins. The microtubule-dependent ATPase activity of recombinant O12 containing the motor and CH domains was significantly reduced in the presence of actin. Interestingly, microtubule-dependent ATPase activity of the motor domain was also affected by actin in the absence of the CH domain. Our findings suggest that the motor activity of the rice plant-specific kinesin O12 may be regulated by actin.

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