microtubule phosphorylation

[rdkortschak at science.adelaide.edu.au]

Does anybody know anything about protein kinase A effects on tubulin
polymerization to microtubules (growth or initiation rate changes).
More specifically: phosphorylation of beta tubulins and inhibition of 
microtubule formation.
Secondly, does anybody know whether there is a tau (microtubule associated
protein) homologue in Drosophila (melanogaster or close).
Thanks, Daniel Kortschak