Dataset Information

Axonal elongation triggered by stimulus-induced local translation of a polarity complex protein.

ABSTRACT: During development, axon growth rates are precisely regulated to provide temporal control over pathfinding. The precise temporal regulation of axonal growth is a key step in the formation of functional synapses and the proper patterning of the nervous system. The rate of axonal elongation is increased by factors such as netrin-1 and nerve growth factor (NGF), which stimulate axon outgrowth using incompletely defined pathways. To clarify the mechanism of netrin-1- and NGF-stimulated axon growth, we explored the role of local protein translation. We found that intra-axonal protein translation is required for stimulated, but not basal, axon outgrowth. To identify the mechanism of translation-dependent outgrowth, we examined the PAR complex, a cytoskeleton regulator. We found that the PAR complex, like local translation, is required for stimulated, but not basal, outgrowth. Par3 mRNA is localized to developing axons, and NGF and netrin-1 trigger its local translation. Selective ablation of Par3 mRNA from axons abolishes the outgrowth-promoting effect of NGF. These results identify a new role for local translation and the PAR complex in axonal outgrowth.

SUBMITTER: Hengst U

PROVIDER: S-EPMC2724225 | biostudies-literature | 2009 Aug

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Axonal elongation triggered by stimulus-induced local translation of a polarity complex protein.

Hengst Ulrich U Deglincerti Alessia A Kim Hyung Joon HJ Jeon Noo Li NL Jaffrey Samie R SR

Nature cell biology 20090720 8

During development, axon growth rates are precisely regulated to provide temporal control over pathfinding. The precise temporal regulation of axonal growth is a key step in the formation of functional synapses and the proper patterning of the nervous system. The rate of axonal elongation is increased by factors such as netrin-1 and nerve growth factor (NGF), which stimulate axon outgrowth using incompletely defined pathways. To clarify the mechanism of netrin-1- and NGF-stimulated axon growth, ...[more]

PMID: 19620967

Similar Datasets

Project description:Translation elongation factors facilitate protein synthesis by the ribosome. Previous studies identified two universally conserved translation elongation factors, EF-Tu in bacteria (known as eEF1A in eukaryotes) and EF-G (eEF2), which deliver aminoacyl-tRNAs to the ribosome and promote ribosomal translocation, respectively. The factor eIF5A (encoded by HYP2 and ANB1 in Saccharomyces cerevisiae), the sole protein in eukaryotes and archaea to contain the unusual amino acid hypusine (N(epsilon)-(4-amino-2-hydroxybutyl)lysine), was originally identified based on its ability to stimulate the yield (endpoint) of methionyl-puromycin synthesis-a model assay for first peptide bond synthesis thought to report on certain aspects of translation initiation. Hypusine is required for eIF5A to associate with ribosomes and to stimulate methionyl-puromycin synthesis. Because eIF5A did not stimulate earlier steps of translation initiation, and depletion of eIF5A in yeast only modestly impaired protein synthesis, it was proposed that eIF5A function was limited to stimulating synthesis of the first peptide bond or that eIF5A functioned on only a subset of cellular messenger RNAs. However, the precise cellular role of eIF5A is unknown, and the protein has also been linked to mRNA decay, including the nonsense-mediated mRNA decay pathway, and to nucleocytoplasmic transport. Here we use molecular genetic and biochemical studies to show that eIF5A promotes translation elongation. Depletion or inactivation of eIF5A in the yeast S. cerevisiae resulted in the accumulation of polysomes and an increase in ribosomal transit times. Addition of recombinant eIF5A from yeast, but not a derivative lacking hypusine, enhanced the rate of tripeptide synthesis in vitro. Moreover, inactivation of eIF5A mimicked the effects of the eEF2 inhibitor sordarin, indicating that eIF5A might function together with eEF2 to promote ribosomal translocation. Because eIF5A is a structural homologue of the bacterial protein EF-P, we propose that eIF5A/EF-P is a universally conserved translation elongation factor.

Dataset Information

Axonal elongation triggered by stimulus-induced local translation of a polarity complex protein.

Publications

Axonal elongation triggered by stimulus-induced local translation of a polarity complex protein.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets