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. 1991 Mar 1;112(5):991–1005. doi: 10.1083/jcb.112.5.991

Monoclonal antibodies show that kinase C phosphorylation of GAP-43 during axonogenesis is both spatially and temporally restricted in vivo

PMCID: PMC2288878  PMID: 1705561

Abstract

To study the role of kinase C phosphorylation in the distribution and function of GAP-43 we have generated a panel of mAbs that distinguish between GAP-43 that has been phosphorylated by kinase C and forms that have not. One class of antibodies, typified by 2G12/C7, reacts with only the phosphorylated form of GAP-43; it recognizes the peptide IQAS(PO4)FR equivalent to residues 38-43 that includes the single kinase C phosphorylation site at serine. Another, exemplified by 10E8/E7, reacts with both phosphorylated and nonphosphorylated forms. We have used the antibodies to study the distribution of kinase C- phosphorylated GAP-43 during axonogenesis and in the adult nervous system. Two major findings emerge. First, there is a lag between the initiation of axon outgrowth and the phosphorylation of GAP-43 by kinase C. The extent of this lag period varies between the different structures studied. In some cases, e.g., the trigeminal nerve, our result suggest that kinase C phosphorylation may be correlated with proximity of the growing axon to its target. Second, kinase C- phosphorylated GAP-43 is always spatially restricted to the distal axon. It is never seen either proximally or in cell bodies, even those with high levels of GAP-43 protein. This result also implies that GAP- 43 is axonally transported in the non-kinase C phosphorylated form. Thus, kinase C phosphorylation of GAP-43 is not required for axon outgrowth or growth cone function per se and may be more related to interactions of the growth cone with its environment.

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Selected References

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