Journal of Neuroscience, Vol 14, 1-13, Copyright © 1994 by Society for Neuroscience
1G5: a calmodulin-binding, vesicle-associated, protein kinase-like protein enriched in forebrain neurites
M Godbout, MG Erlander, KW Hasel, PE Danielson, KK Wong, EL Battenberg, PE Foye, FE Bloom and JG Sutcliffe
Department of Molecular Biology, Scripps Research Institute, La Jolla, California 92037.
We have characterized cDNA clones of 1G5, an mRNA highly enriched in the
mammalian forebrain that encodes a 504-residue protein found in association
with perikaryal membranes and neurites. The protein, which accumulates
predominantly postnatally, is associated with vesicles in both axons and
dendrites. The sequence of the 1G5 protein highly resembles those of
protein kinases with serine/threonine specificity; however, although most
residues universally conserved among protein kinases are present, a few
signature residues are absent from the 1G5 protein. Furthermore, although
recombinant 1G5 protein binds calmodulin in the presence of calcium, it
lacks kinase activity with a sample substrate.