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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Biochem+J
2015 ; 466
(3
): 571-85
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Degradation of gap junction connexins is regulated by the interaction with
Cx43-interacting protein of 75 kDa (CIP75)
#MMPMID25583071
Kopanic JL
; Schlingmann B
; Koval M
; Lau AF
; Sorgen PL
; Su VF
Biochem J
2015[Mar]; 466
(3
): 571-85
PMID25583071
show ga
Connexins are a family of transmembrane proteins that form gap junction channels.
These proteins undergo both proteasomal and lysosomal degradation, mechanisms
that serve to regulate connexin levels. Our previous work described CIP75
[connexin43 (Cx43)-interacting protein of 75 kDa], a protein involved in
proteasomal degradation, as a novel Cx43-interacting protein. We have discovered
two additional connexins, connexin40 (Cx40) and connexin45 (Cx45), that interact
with CIP75. Nuclear magnetic resonance (NMR) analyses identified the direct
interaction of the CIP75 UBA domain with the carboxyl-terminal (CT) domains of
Cx40 and Cx45. Reduction in CIP75 by shRNA in HeLa cells expressing Cx40 or Cx45
resulted in increased levels of the connexins. Furthermore, treatment with
trafficking inhibitors confirmed that both connexins undergo endoplasmic
reticulum-associated degradation (ERAD), and that CIP75 preferentially interacts
with the connexin proteins bound for proteasomal degradation from the ER. In
addition, we have also discovered that CIP75 interacts with ER-localized Cx32 in
a process that is likely mediated by Cx32 ubiquitination. Thus, we have
identified novel interacting connexin proteins of CIP75, indicating a role for
CIP75 in regulating the levels of connexins in general, through proteasomal
degradation.