RGD Reference Report - KIF21A-mediated axonal transport and selective endocytosis underlie the polarized targeting of NCKX2. - Rat Genome Database

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KIF21A-mediated axonal transport and selective endocytosis underlie the polarized targeting of NCKX2.

Authors: Lee, Kyu-Hee  Lee, Jae Sung  Lee, Doyun  Seog, Dae-Hyun  Lytton, Jonathan  Ho, Won-Kyung  Lee, Suk-Ho 
Citation: Lee KH, etal., J Neurosci. 2012 Mar 21;32(12):4102-17. doi: 10.1523/JNEUROSCI.6331-11.2012.
RGD ID: 405650295
Pubmed: PMID:22442075   (View Abstract at PubMed)
PMCID: PMC6621231   (View Article at PubMed Central)
DOI: DOI:10.1523/JNEUROSCI.6331-11.2012   (Journal Full-text)

We have previously shown that K(+)-dependent Na(+)/Ca(2+) exchanger (NCKX) is a major calcium clearance mechanism at the large axon terminals of central neurons, whereas their somata display little NCKX activity. We investigated mechanisms underlying the axonal polarization of NCKX2 in rat hippocampal neurons. We identified NCKX2 as the first neuron-specific cargo molecule of kinesin family member 21A (KIF21A). The intracellular loop of NCKX2 specifically interacted with the WD-40 repeats, a putative cargo-binding domain, of KIF21A. Dominant-negative mutant or depletion of KIF21A inhibited the transport of NCKX2-GFP to axon fibers. Knockdown of KIF21A caused calcium dysregulation at axonal boutons but not at somatodendritic regions. Despite the axonal polarization of the NCKX activity, both somatodendritic and axonal regions were immunoreactive to NCKX2. The surface expression of NCKX2 revealed by live-cell immunocytochemistry, however, displayed highly polarized distribution to the axon. Inhibition of endocytosis increased the somatodendritic surface NCKX2 and thus abolished the axonal polarization of surface NCKX2. These results indicate that KIF21A-mediated axonal transport and selective somatodendritic endocytosis underlie the axonal polarized surface expression of NCKX2.




Biological Process

  
Object Symbol
Species
Term
Qualifier
Evidence
With
Notes
Source
Original Reference(s)
Kif21aRatanterograde axonal transport involved_inIDA PMID:22442075SynGO 
Kif21aRatanterograde axonal transport involved_inIMP PMID:22442075SynGO 

Cellular Component

  
Object Symbol
Species
Term
Qualifier
Evidence
With
Notes
Source
Original Reference(s)
Kif21aRatpresynapse is_active_inIDA PMID:22442075SynGO 
Kif21aRatpresynapse is_active_inIMP PMID:22442075SynGO 


Genes (Rattus norvegicus)
Kif21a  (kinesin family member 21A)