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14-3-3 protein interacts with Huntingtin-associated protein 1 and regulates its trafficking.

Authors: Rong, J  Li, S  Sheng, G  Wu, M  Coblitz, B  Li, M  Fu, H  Li, XJ 
Citation: Rong J, etal., J Biol Chem. 2007 Feb 16;282(7):4748-56. Epub 2006 Dec 13.
Pubmed: (View Article at PubMed) PMID:17166838
DOI: Full-text: DOI:10.1074/jbc.M609057200

HAP1 (Huntingtin-associated protein 1) consists of two alternately spliced isoforms (HAP1A and HAP1B, which have unique C-terminal sequences) and participates in intracellular trafficking. The C terminus of HAP1A is phosphorylated, and this phosphorylation was found to decrease the association of HAP1A with kinesin light chain, a protein involved in anterograde transport in cells. It remains unclear how this phosphorylation functions to regulate the association of HAP1 with trafficking proteins. Using the yeast two-hybrid system, we found that HAP1 also interacts with 14-3-3 proteins, which are involved in the assembly of protein complexes and the regulation of protein trafficking. The interaction of HAP1 with 14-3-3 is confirmed by their immunoprecipitation and colocalization in mouse brain. Moreover, this interaction is specific to HAP1A and is increased by the phosphorylation of the C terminus of HAP1A. We also found that expression of 14-3-3 decreases the association of HAP1A with kinesin light chain. As a result, there is less HAP1A distributed in neurite tips of PC12 cells that overexpress 14-3-3. Also, overexpression of 14-3-3 reduces the effect of HAP1A in promoting neurite outgrowth of PC12 cells. We propose that the phosphorylation-dependent interaction of HAP1A with 14-3-3 regulates HAP1 function by influencing its association with kinesin light chain and trafficking in neuronal processes.


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CRRD Object Information
CRRD ID: 10047162
Created: 2015-07-11
Species: All species
Last Modified: 2015-07-11
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.