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We previously demonstrated the presence of ANF(99-126), and ANF(99-126) cleaved between Cys105 and Phe106 (cleaved ANF), in human coronary sinus plasma. We now report that cleaved ANF is formed when synthetic ANF(99-126) is added to human plasma. When synthetic ANF(99-126) was incubated in heparinized human plasma, HPLC analysis showed two degradation products. The main product was shown by amino acid and sequence analysis to be cleaved ANF. Degradation of ANF was inhibited by EDTA and phosphoramidon. These findings are consistent with the action of endopeptidase EC 3.4.24.11, which may play an important part in the biological inactivation of ANF.
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