Spinophilin facilitates dephosphorylation of doublecortin by PP1 to mediate microtubule bundling at the axonal wrist.

Abstract:

:The axonal shafts of neurons contain bundled microtubules, whereas extending growth cones contain unbundled microtubule filaments, suggesting that localized activation of microtubule-associated proteins (MAP) at the transition zone may bundle these filaments during axonal growth. Dephosphorylation is thought to lead to MAP activation, but specific molecular pathways have remained elusive. We find that Spinophilin, a Protein-phosphatase 1 (PP1) targeting protein, is responsible for the dephosphorylation of the MAP Doublecortin (Dcx) Ser 297 selectively at the "wrist" of growing axons, leading to activation. Loss of activity at the "wrist" is evident as an impaired microtubule cytoskeleton along the shaft. These findings suggest that spatially restricted adaptor-specific MAP reactivation through dephosphorylation is important in organization of the neuronal cytoskeleton.

journal_name

Cell

journal_title

Cell

authors

Bielas SL,Serneo FF,Chechlacz M,Deerinck TJ,Perkins GA,Allen PB,Ellisman MH,Gleeson JG

doi

10.1016/j.cell.2007.03.023

subject

Has Abstract

pub_date

2007-05-04 00:00:00

pages

579-91

issue

3

eissn

0092-8674

issn

1097-4172

pii

S0092-8674(07)00389-3

journal_volume

129

pub_type

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