The Minus-End-Directed Kinesin OsDLK Shuttles to the Nucleus and Modulates the Expression of Cold-Box Factor 4

The transition to terrestrial plants was accompanied by a progressive loss of microtubule minus end-directed dynein motors. Instead, the minus-end directed class-XIV kinesins expanded considerably, probably related to novel functions. One of these motors, OsDLK (Dual Localisation Kinesin from rice) decorates cortical microtubules but moves into the nucleus in response to cold stress. This analysis of loss-of-function mutants in rice indicates that OsDLK participates in cell elongation during development. Since OsDLK harbours both, a nuclear localisation signal, and a putative leucin zipper, we asked, whether the cold-induced import of OsDLK into the nucleus might correlate with a specific DNA binding. Conducting a DPI-ELISA screen with recombinant OsDLKT (lacking the motor domain), we identified the Opaque2 motif as most promising candidate. This motif is present in the promoter of NtAvr9/Cf9, the tobacco homologue of Cold Box Factor 4, a transcription factor involved in cold adaptation. A comparative study revealed that the cold-induced accumulation of NtAvr9/Cfp9 was specifically quelled in transgenic BY-2 cells overexpressing OsDLK-GFP. These findings are discussed as a working model, where, in response to cold stress, OsDLK partitions from cortical microtubules at the plasma membrane into the nucleus and specifically modulates the expression of genes involved in cold adaptation.