J. Biol. Chem., Vol. 265, Issue 12, 6556-6561, Apr, 1990
Molecular cloning and sequence analysis of a cDNA encoding a porcine kidney renin-binding protein
H Inoue, K Fukui, S Takahashi and Y Miyake
Department of Biochemistry, National Cardiovascular Center Research Institute, Osaka, Japan.
A complementary DNA encoding a renin-binding protein (RnBP) has been
isolated from a porcine kidney cDNA library by immunological screening of
in vitro translation products from the cDNAs. Analysis of the nucleotide
sequence of the clone revealed a 1,342-nucleotide sequence with a
5'-terminal untranslated region of 52 nucleotides, an open reading frame of
1,206 nucleotides that encodes 402 amino acids, and a 3'-terminal
untranslated region of 84 nucleotides that contains the polyadenylation
signal sequence, AATAAA. The predicted amino acid sequence contains no
hydrophobic amino-terminal sequence and does not show significant homology
to those of other identified proteins. The in vitro translated RnBP was
found to have the same molecular weight, 42,000, as that of the purified
RnBP from porcine kidney on sodium dodecyl sulfate-polyacrylamide gel
electrophoresis and it formed a complex with renin purified from porcine
kidney, which indicates that the cDNA encodes a functional RnBP without a
propeptide sequence. The RnBP cDNA probe hybridized to a 1.5-kilobase mRNA
in kidney, liver, adrenal, and pituitary glands, the amount being much
greater in kidney than in the other tissues. Southern blot analysis showed
the presence of a unique gene for RnBP in the porcine genome.