Kunitz-type serine protease inhibitor NACI

UniProtKB accession:  Q5ZPJ7

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UniProtKB description:  Serine protease inhibitor that inhibits chymotrypsin (Ki=25 nM) (PubMed:15698956, PubMed:14990218). Also interacts with vasopressin V2 receptor (V2R/AVPR2) (PubMed:35122240). Inhibits vasopressin binding human V2R in the nanomolar range (Ki=112 nM), and also moderately inhibits vasopressin-induced cAMP production (IC(50)=138 nM). In vivo, intraperitoneal injection of this protein into rats increases diuresis by 2.2-fold, without any loss of electrolytes (PubMed:35122240).