| First Author | Kamada S | Year | 1992 |
| Journal | Gene | Volume | 119 |
| Issue | 2 | Pages | 229-36 |
| PubMed ID | 1398104 | Mgi Jnum | J:49197 |
| Mgi Id | MGI:1289114 | Doi | 10.1016/0378-1119(92)90276-u |
| Citation | Kamada S, et al. (1992) A protein binding to CArG box motifs and to single-stranded DNA functions as a transcriptional repressor. Gene 119(2):229-36 |
| abstractText | A CArG box motif [CC(A+T-rich)6GG] is one of the DNA elements required for muscle-specific gene transcription. Nuclear factors in mouse C2 myogenic cells strongly bind to the CArG box in the first intron of the gene (Sm alpha-A) encoding human smooth muscle alpha-actin. To clone cDNAs of the CArG box-binding factor (CBF), lambda gt11 cDNA expression libraries from C2 cells were screened for in situ DNA binding specific for this CArG box sequence. The 1.6-kb cDNA (CBF-A) encoding 285 amino acids (aa) was obtained, and a beta-galactosidase fusion protein, bacterially produced from the cDNA, bound to DNA fragments containing several CArG boxes. When the expression level of CBF-A in C2 cells increased by transfection of CBF-A expression plasmids, Sm alpha-A transcription was repressed. The deduced aa sequence of CBF-A is similar to some single-stranded (ss) nucleic acid-binding proteins. The fusion protein could bind to ssDNA, whereas CBF in C2 cell nuclear extracts could not. From these results, CBF-A is a novel CArG box-, ssDNA- and RNA-binding protein, as well as a repressive transcriptional factor. |
