Isoform-specific proteasomal degradation of Rbfox3 during chicken embryonic development.

Abstract:

:Rbfox3, a neuron-specific RNA-binding protein, plays an important role in neuronal differentiation during development. An isoform Rbfox3-d31, which excludes the 93-nucleotide cassette exon within the RNA recognition motif of chicken Rbfox3, has been previously identified. However, the cellular functions of Rbfox3-d31 remain largely unknown. Here we find that Rbfox3-d31 mRNA is highly expressed during the early developmental stages of the chicken embryo, while Rbfox3-d31 protein is barely detected during the same stage due to its rapid degradation mediated by the ubiquitin-proteasome pathway. Importantly, this degradation is specific to the Rbfox3-d31 isoform and it does not occur with full-length Rbfox3. Furthermore, suppression of Rbfox3-d31 protein degradation with the proteasome inhibitor MG132 attenuates the splicing activity of another Rbfox family member Rbfox2 by altering the subcellular localization of Rbfox2. These results suggest that Rbfox3-d31 functions as a repressor for the splicing activity of the Rbfox family and its protein level is regulated in an isoform-specific manner in vivo.

authors

Kim KK,Adelstein RS,Kawamoto S

doi

10.1016/j.bbrc.2014.07.057

subject

Has Abstract

pub_date

2014-08-08 00:00:00

pages

1662-7

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(14)01285-6

journal_volume

450

pub_type

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