Nucleic Acids Research, 1984, Vol. 12, No. 19 7455-7465
© 1984
MOLECULAR BIOLOGY |
Molecular cloning and the complete nucleotide sequence of cDNA to mRNA for S-100 protein of rat brain
Department of Neuropharmacology, Brain Research Institute, Niigata University Asahimachi 1, Niigata 951 *Department of Chemistry, Faculty of Pharmaceutical Sciences, Osaka University 16 Yamadaoka, Suita, Osaka 565, Japan
Received August 16, 1984. Accepted September 12, 1984.
The complete nucleotide sequence of mRNA for ß-subunit of rat brain S-100 protein was determined from recombinant cDNA clones. The sequence was composed of 1488 bp which Included the 276 bp of the complete coding region, the 120 bp of the 5'-noncoding region and the 1092 bp of the 3'-noncoding region containing two polyadenylation signals. In addition, the poly(A) tail was also found. The amino add sequence deduced from the nucleotide sequence was homologous to the amino acid sequence of bovine S-100 ß subunit except 4 residues showing species differences. From the viewpoint of evolutionary implications, the homology between the nucleotide sequence of S-100 and those of rat intestinal Ca-b1nding protein (ICaBP) and calmodulin (CaM) was examined. A dot-blot hybridization of poly(A) RNA from the developing rat brainsusing a labeled cDNA showed a rapid increase in S-100 mRNA at 1020 postnatal days. The presence of S-100 mRNA in C-6 glioma cells 1s also described.
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