[Functional interaction of the C-terminal of Nogo protein with connexin 26 and the expression of Nogo's mRNA in the murine inner ear].
OBJECTIVE
To screen and identify the proteins that interact with connexin 26 (CX26) and to analyze the expressions of these proteins in cochlea so as to explore the proteins that relate to the trafficking, assembly, localizing and gap junction functions of CX26.


METHODS
The whole coding region of GJB2 (CX26) gene was amplified from normal human genomic DNA by polymerase chain reaction (PCR) and then directionally subcloned into the vector pGBKT7 plasmid of the Match Maker Ga14 Two-Hybrid System 3 as a target to screen the interactive proteins of CX26 from the human fetal brain cDNA library by the yeast two hybrid technique. The false positive clones were discarded from the preys by repeated yeast two hybrid method between CX26 and everyone of the preys respectively. The DNAs of the insert of the identified positive clone were sequenced and BLAST analyzed against the GenBank. Lastly, the mRNA of the gene encoding the identified protein was analyzed in the murine inner ear by reverse transcription-polymerase chain reaction (RT-PCR).


RESULTS
The insert of one positive clone contained 867 bp with the former 525 bp being coding region. The DNA sequence and the open reading frame of the insert were identical to the 525 bp before the stop codes (including the stop codes) and the 238 bp after the stop codes of RTN4 gene which encoded Nogo protein. And the 174 amino acid residues encoded by the insert were those of the C-terminal of Nogo protein: Nogo-A, Nogo-B and Nogo-C. RTN4 mRNA expressed in the murine inner ear was confirmed by RT-PCR method.


CONCLUSIONS
The C-terminal of Nogo protein interacts with CX26. Nogo protein expresses in the inner ear and may take part in the trafficking of CX26 or CX26 gap junction function.
Xiao
Zi-an
ZA
Department of Otolaryngology and Head-neck Surgery, the Second Xiangya Hospital, Central South University, Changsha, Hunan, 410011 PR China. xiaozian@hotmail.com
Xie
Ding-hua
DH
Hu
Peng
P
Xia
Kun
K
Cai
Fang
F
Pan
Qian
Q
D000818:Animals; D001483:Base Sequence; D000072259:Connexin 26; D017630:Connexins / Q000235:genetics / Q000378:metabolism*; D007758:Ear, Inner / Q000378:metabolism*; D015870:Gene Expression; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D009185:Myelin Proteins / Q000235:genetics / Q000378:metabolism*; D000070798:Nogo Proteins; D011485:Protein Binding; D012333:RNA, Messenger / Q000235:genetics* / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020798:Two-Hybrid System Techniques
D017630:Connexins; C000607042:GJB2 protein, human; C000607043:Gjb2 protein, mouse; D009185:Myelin Proteins; D000070798:Nogo Proteins; D012333:RNA, Messenger; C000603199:RTN4 protein, human; C000603201:Rtn4 protein, mouse; D000072259:Connexin 26