AMPK regulates anaphase central spindle length by phosphorylation of KIF4A

Abstract

AMP-activated protein kinase (AMPK) is an energy sensor that couples the cellular energy state with basic biological processes. AMPK is thought to be linked with cell division although the underlying mechanisms remain largely unknown. Here, we show that AMPK functionally participates throughout cell division and that AMPK catalytic subunits, especially α2, are sequentially associated with separate mitotic apparatus. Using quantitative phosphoproteomics analysis, we found that the strong direct substrate KIF4A is phosphorylated by AMPK at Ser801. Further analysis revealed that AMPK and Aurora B competitively phosphore-gulates KIF4A during mitotic phase due to overlapping recognition motifs, resulting in the elaborate phosphoregulation for KIF4A-dependent central spindle length control. Given the intrinsic energy-sensing function of AMPK, our study links the KIF4A-dependent control of central spindle length with cellular glucose stress.