Nucleotide sequence of rat alpha 1-acid glycoprotein messenger RNA
- PMID: 6270146
Nucleotide sequence of rat alpha 1-acid glycoprotein messenger RNA
Abstract
The complete nucleotide sequence of rat alpha 1-acid glycoprotein (alpha 1-AGP) mRNA has been determined from cloned double-stranded cDNA. The coding portion of the mRNA was bounded at the ends by a 5'-untranslated region of 35 nucleotides in length and a 3'-untranslated region of 119 nucleotides in length. The 3'-untranslated region contains the characteristic AAUAAA sequence ending 18 nucleotides from the 3'-terminal poly(A) segment. The 5'-region of the mRNA contains two in-phase AUG codons separated by 12 nucleotides. Comparison with the known NH2-terminal amino acid sequence of serum rat alpha 1-AGP suggests that the primary translation product of the mRNA contains an additional 14 or 18 amino acids that are not present in the mature form of the protein, which contains 187 amino acids. The inferred amino acid sequence of rat alpha 1-AGP and the known amino acid sequence of human alpha 1-AGP have several regions of identity clustered in the NH2-terminal portion of the proteins. The carboxyl-terminal regions show significantly less homology. Six potential asparagine glycosylation sites are found in the rat sequence, and four of these sites are in positions similar to known glycosylation sites in the human protein. Furthermore, three of these potential glycosylation sites are in a region that exhibits extensive amino acid sequence conservation, suggesting that this region may be important for the biological function of alpha 1-AGP.
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