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Angiotensinogen and kininogen: cloning and sequence analysis of the cDNAs.

The primary structures of the angiotensinogen precursor and the low molecular weight (LMW) kininogen precursors have been deduced by determining the nucleotide sequences of cloned DNAs complementary to their mRNAs. The angiotensinogen precursor consists of a mature angiotensinogen of 453 amino acid residues and a putative signal peptide of 24 amino acid residues. An angiotensin moiety is located at the amino-terminal part of angiotensinogen, preceded directly by the signal peptide and followed by a large carboxyl-terminal sequence that contains two internally homologous sequences and three potential glycosylation sites. The LMW kininogen precursors are encoded by two very similar but distinct mRNAs and composed of 436 and 434 amino acid residues. Both kininogens contain two internally homologous sequences in which all amino acid differences between the two kininogens are located. This suggests that these homologous regions may be biologically significant in relation to the existence of two LMW kininogens.