Muscle LIM protein promotes expression of the acetylcholine receptor gamma-subunit gene cooperatively with the myogenin-E12 complex.
Muscle LIM protein (MLP, also referred to as CRP3) is a muscle-specific LIM-only protein, which consists of two LIM motifs. MLP functions as a positive regulator during myogenesis. Here we report that MLP serves as a cofactor regulating the expression of the nicotinic acetylcholine receptor (AChR) gamma-subunit gene in skeletal muscle cells. We found that MLP promoted the expression of the AChR gamma-subunit gene in C2C12 myotubes, but not in C2C12 myoblasts or NIH3T3 fibroblasts. Furthermore, we showed that MLP interacted with myogenin in vivo and enhanced the binding ability of the myogenin-E12 heterodimer to the E boxes in the AChR gamma-subunit gene promoter. Together, these results suggest that MLP promotes the specific expression of the AChR gamma-subunit gene cooperatively with the myogenin-E12 complex during myogenesis.
Lu
P Y
PY
Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Beijing 100083, China.
Taylor
M
M
Jia
H T
HT
Ni
J H
JH
D000818:Animals; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000378:metabolism*; D024202:Electrophoretic Mobility Shift Assay; D005786:Gene Expression Regulation; D060588:LIM Domain Proteins; D046911:Macromolecular Substances; D051379:Mice; D024510:Muscle Development / Q000235:genetics; D009124:Muscle Proteins / Q000235:genetics* / Q000378:metabolism*; D018008:Myogenin / Q000378:metabolism*; D041681:NIH 3T3 Cells; D011401:Promoter Regions, Genetic / Q000235:genetics; D011485:Protein Binding; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D011950:Receptors, Cholinergic / Q000235:genetics*; D020218:Response Elements / Q000235:genetics; D051820:TCF Transcription Factors; D058125:Transcription Factor 7-Like 1 Protein; D014157:Transcription Factors / Q000378:metabolism*; D020798:Two-Hybrid System Techniques
D004268:DNA-Binding Proteins; D060588:LIM Domain Proteins; D046911:Macromolecular Substances; D009124:Muscle Proteins; C503801:Myog protein, mouse; C503803:Myog protein, rat; D018008:Myogenin; D012333:RNA, Messenger; D011950:Receptors, Cholinergic; D051820:TCF Transcription Factors; C544913:Tcf7l1 protein, mouse; C553060:Tcf7l1 protein, rat; D058125:Transcription Factor 7-Like 1 Protein; D014157:Transcription Factors; C090114:cysteine and glycine-rich protein 3