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Hypertension, Vol 7, 3-12, Copyright © 1985 by American Heart Association

ARTICLES

Three-dimensional structure of human renin

K Akahane, H Umeyama, S Nakagawa, I Moriguchi, S Hirose, K Iizuka and K Murakami

A three-dimensional model of human renin has been constructed based on the assumption that the overall folding of the aspartyl proteases is very similar. As a reference, we used penicillopepsin, the structure of which has been reported at a resolution of 1.8 A, and its main chain was traced to build a model of renin. The resulting structure seems to be stable from the hydrophobic and hydrophilic viewpoints. Comparison of the tertiary structure of human renin with that of penicillopepsin and mouse renin suggests the existence of a high structural homology as well as differences in the molecular geometry of the active sites that may influence the substrate specificity. The asparagine side chains in the glycosidation signal of Asn-X-Thr are exposed on the surface. Moreover, the site in human renin that corresponds to the proteolytic cleavage site in mouse renin also appears to be exposed on the surface so as to be easily scissored during the maturation process. The insertions and deletions of amino acid residues were found to arise on the surface, and in some places they occurred in complementary manners. Models of molecular complexes between human renin and renin inhibitor were constructed to understand the interacting modes that indicate how new renin inhibitors develop. Inhibitor-binding sites were directly assigned based on the models of the inhibitor-enzyme complex.

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