title: Evolution of the spatial distribution of MAP1B phosphorylation sites in vertebrate neurons.
abstract: The microtubule-associated protein MAP1B has important roles in neural development, particularly in migrating and differentiating neurons. MAP1B is phosphorylated by glycogen synthase kinase 3beta (GSK-3beta) at a site that requires prior phosphorylation by another kinase four amino acid residues downstream of the GSK-3beta site, a so-called primed site, and at non-primed sites that have no such requirement. In developing mammalian neurons, MAP1B phosphorylated by GSK-3beta at primed and non-primed sites is distributed in spatially distinct patterns. Non-primed GSK-3beta-phosphorylated MAP1B sites are only expressed in axons and are present in the form of a gradient that is highest distally, towards the growth cone. In contrast, primed GSK-3beta-phosphorylated MAP1B sites are present throughout the neuron including the somato-dendritic compartment and uniformly throughout the axon. To examine the function of these two sites, we explored the evolutionary conservation of the spatial distribution of GSK-3beta primed and non-primed sites on MAP1B in vertebrate neurons. We immunostained spinal cord sections from embryonic or newly hatched representatives of all of the main vertebrate groups using phospho-specific antibodies to GSK-3beta primed and non-primed sites on MAP1B. This revealed a remarkable evolutionary conservation of the distribution of primed and non-primed GSK-3beta-phosphorylated MAP1B sites in developing vertebrate neurons. By analysing amino acid sequences of MAP1B we found that non-primed GSK-3beta sites are more highly conserved than primed sites throughout the vertebrates, suggesting that the latter evolved later. Finally, distinct distribution patterns of GSK-3beta primed and non-primed sites on MAP1B were preserved in cultured rat embryonic cortical neurons, opening up the possibility of studying the two sites in vitro.
authors.affiliation: MRC Centre for Developmental Neurobiology, King's College London, Guy's Campus, London, UK.
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Tymanskyj
authors.forename: Shen
authors.initials: S
authors.lastname: Lin
authors.forename: Phillip R
authors.initials: PR
authors.lastname: Gordon-Weeks
mesh_terms: D000818:Animals; D005075:Biological Evolution; D038362:Glycogen Synthase Kinase 3 / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D000071679:Glycogen Synthase Kinase 3 beta; D008869:Microtubule-Associated Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D009474:Neurons / Q000166:cytology / Q000378:metabolism*; D010766:Phosphorylation; D051381:Rats; D012911:Snakes; D014982:Xenopus laevis; D015027:Zebrafish
chemical_list: D008869:Microtubule-Associated Proteins; D000071679:Glycogen Synthase Kinase 3 beta; C000605508:Gsk3b protein, rat; D038362:Glycogen Synthase Kinase 3
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