| Literature DB >> 23510938 |
Weina Ju1, Qi Li, Sarah M Wilson, Joel M Brittain, Louay Meroueh, Rajesh Khanna.
Abstract
The axon/dendrite specification collapsin response mediator protein 2 (CRMP2) bidirectionally modulates N-type voltage-gated Ca ( 2+) channels (CaV2.2). Here we demonstrate that small ubiquitin-like modifier (SUMO) protein modifies CRMP2 via the SUMO E2-conjugating enzyme Ubc9 in vivo. Removal of a SUMO conjugation site KMD in CRMP2 (K374A/M375A/D376A; CRMP2AAA) resulted in loss of SUMOylated CRMP2 without compromising neurite branching, a canonical hallmark of CRMP2 function. Increasing SUMOylation levels correlated inversely with calcium influx in sensory neurons. CRMP2 deSUMOylation by SUMO proteases SENP1 and SENP2 normalized calcium influx to those in the CRMP2AAA mutant. Thus, our results identify a novel role for SUMO modification in CRMP2/CaV2.2 signaling pathway.Entities:
Keywords: CRMP2; CaV2.2; SUMO; Ubc9; calcium influx; sensory neurons
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Year: 2013 PMID: 23510938 PMCID: PMC3710342 DOI: 10.4161/chan.24224
Source DB: PubMed Journal: Channels (Austin) ISSN: 1933-6950 Impact factor: 2.581