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  • KIF5B transports BNIP-2 to regulate p38 mitogen-activated protein kinase activation and myoblast differentiation.

KIF5B transports BNIP-2 to regulate p38 mitogen-activated protein kinase activation and myoblast differentiation.

Molecular biology of the cell (2014-11-08)
Peng Yi, Li Li Chew, Ziwang Zhang, Hao Ren, Feiya Wang, Xiaoxia Cong, Liling Zheng, Yan Luo, Hongwei Ouyang, Boon Chuan Low, Yi Ting Zhou
ABSTRACT

The Cdo-p38MAPK (p38 mitogen-activated protein kinase) signaling pathway plays important roles in regulating skeletal myogenesis. During myogenic differentiation, the cell surface receptor Cdo bridges scaffold proteins BNIP-2 and JLP and activates p38MAPK, but the spatial-temporal regulation of this process is largely unknown. We here report that KIF5B, the heavy chain of kinesin-1 motor, is a novel interacting partner of BNIP-2. Coimmunoprecipitation and far-Western study revealed that BNIP-2 directly interacted with the motor and tail domains of KIF5B via its BCH domain. By using a range of organelle markers and live microscopy, we determined the endosomal localization of BNIP-2 and revealed the microtubule-dependent anterograde transport of BNIP-2 in C2C12 cells. The anterograde transport of BNIP-2 was disrupted by a dominant-negative mutant of KIF5B. In addition, knockdown of KIF5B causes aberrant aggregation of BNIP-2, confirming that KIF5B is critical for the anterograde transport of BNIP-2 in cells. Gain- and loss-of-function experiments further showed that KIF5B modulates p38MAPK activity and in turn promotes myogenic differentiation. Of importance, the KIF5B-dependent anterograde transport of BNIP-2 is critical for its promyogenic effects. Our data reveal a novel role of KIF5B in the spatial regulation of Cdo-BNIP-2-p38MAPK signaling and disclose a previously unappreciated linkage between the intracellular transporting system and myogenesis regulation.

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