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Published online 4 October 2004. doi:10.1083/jcb.200401085
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 167, Number 1, 99-110
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Article

MARK/PAR1 kinase is a regulator of microtubule-dependent transport in axons



Eva-Maria Mandelkow, Edda Thies, Bernhard Trinczek, Jacek Biernat, and Eckard Mandelkow

Max-Planck Unit for Structural Molecular Biology, 22607 Hamburg, Germany

Correspondence to Eva Marie Mandelkow: mandelkow{at}mpasmb.desy.de

Microtubule-dependent transport of vesicles and organelles appears saltatory because particles switch between periods of rest, random Brownian motion, and active transport. The transport can be regulated through motor proteins, cargo adaptors, or microtubule tracks. We report here a mechanism whereby microtubule associated proteins (MAPs) represent obstacles to motors which can be regulated by microtubule affinity regulating kinase (MARK)/Par-1, a family of kinases that is known for its involvement in establishing cell polarity and in phosphorylating tau protein during Alzheimer neurodegeneration. Expression of MARK causes the phosphorylation of MAPs at their KXGS motifs, thereby detaching MAPs from the microtubules and thus facilitating the transport of particles. This occurs without impairing the intrinsic activity of motors because the velocity during active movement remains unchanged. In primary retinal ganglion cells, transfection with tau leads to the inhibition of axonal transport of mitochondria, APP vesicles, and other cell components which leads to starvation of axons and vulnerability against stress. This transport inhibition can be rescued by phosphorylating tau with MARK.

B. Trinczek's present address is Dept. of Medicinal Chemistry, University of Kansas, Lawrence, KS 66045.

Abbreviations used in this paper: APP, amyloid precursor protein; MAP, microtubule associated protein; MARK, microtubule affinity regulating kinase; RGC, retinal ganglion cell.


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