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2015 ; 5
(ä): 10667
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The Cullin 4A/B-DDB1-Cereblon E3 Ubiquitin Ligase Complex Mediates the
Degradation of CLC-1 Chloride Channels
#MMPMID26021757
Chen YA
; Peng YJ
; Hu MC
; Huang JJ
; Chien YC
; Wu JT
; Chen TY
; Tang CY
Sci Rep
2015[May]; 5
(ä): 10667
PMID26021757
show ga
Voltage-gated CLC-1 chloride channels play a critical role in controlling the
membrane excitability of skeletal muscles. Mutations in human CLC-1 channels have
been linked to the hereditary muscle disorder myotonia congenita. We have
previously demonstrated that disease-associated CLC-1 A531V mutant protein may
fail to pass the endoplasmic reticulum quality control system and display
enhanced protein degradation as well as defective membrane trafficking. Currently
the molecular basis of protein degradation for CLC-1 channels is virtually
unknown. Here we aim to identify the E3 ubiquitin ligase of CLC-1 channels. The
protein abundance of CLC-1 was notably enhanced in the presence of MLN4924, a
specific inhibitor of cullin-RING E3 ligases. Subsequent investigation with
dominant-negative constructs against specific subtypes of cullin-RING E3 ligases
suggested that CLC-1 seemed to serve as the substrate for cullin 4A (CUL4A) and
4B (CUL4B). Biochemical examinations further indicated that CUL4A/B,
damage-specific DNA binding protein 1 (DDB1), and cereblon (CRBN) appeared to
co-exist in the same protein complex with CLC-1. Moreover, suppression of CUL4A/B
E3 ligase activity significantly enhanced the functional expression of the A531V
mutant. Our data are consistent with the idea that the CUL4A/B-DDB1-CRBN complex
catalyses the polyubiquitination and thus controls the degradation of CLC-1
channels.