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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Genetic and molecular properties of human and rat renin- binding proteins with reference to the function of the leucine zipper motif.

The presence of a leucine zipper motif was recognized in the deduced amino acid sequences of human and rat renin- binding proteins (RnBPs) on cloning and sequence analysis of the RnBP cDNAs. The in vitro synthesized RnBPs, with the respective cDNAs, formed heterodimers with porcine renin and homodimers. On comparison of these properties with those of porcine RnBP, the leucine zipper motif was suggested to be a functional domain common to animal RnBPs. In addition to the motif, a hydrophobic domain adjacent to the motif and 10 cysteine residues were also well conserved in the three RnBPs. Moreover, about 85% of their amino acid sequences were identical. The RnBP mRNAs were expressed in the kidneys as the same size of 1.5-kb and the genes are suggested to exist as single copies in the genomes. Despite the high similarities in genetic and molecular properties, the molecular weights of human and rat RnBPs were 43,000, which is 1,000 larger than that of porcine RnBP. The immunoreactivities of human and rat RnBPs toward anti-porcine RnBP antiserum were 88 and 8% that of porcine RnBP, respectively, and the affinities of the two RnBPs for porcine renin were remarkably less than that of porcine RnBP. Moreover, the human and rat RnBP homodimers were partly dissociated under the conditions under which porcine RnBP existed as a dimer. These results indicate distinct differences in the molecular properties among the three RnBPs, in spite of their being highly similar structurally and functionally.[1]


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