Ribonuclease A family member (more specifically, Pancreatic ribonuclease or Ribonuclease 1 in human, which is the prototypic member of the RNase A family) (RNase A (for bovine enzyme), RNase 1 (for human protein))

Members of the Ribonuclease A family (e.g., Pancreatic ribonuclease/RNase 1) are secreted endoribonucleases that catalyze the cleavage of RNA, specifically targeting the 3' side of pyrimidine nucleotides in single-stranded RNA[3][6]. The classical RNase A from bovine pancreas was the first enzyme of this type structurally characterized; human RNase 1 is the closest homolog and shares similar activity and disulfide-bonded architecture[3][5][6]. RNase A family members play important roles in RNA digestion, defense against pathogens, and regulation of extracellular RNA homeostasis. Several family members can exert cytotoxic effects on tumor cells and appear to function in host defense and innate immunity. The cytosolic ribonuclease inhibitor protein binds tightly to RNase A family enzymes and regulates their activity, protecting cells from unwanted RNA degradation[3][5]. Structure–function studies have revealed key active site residues (e.g., His12, His119, Lys41) essential for catalysis[1][3]. While their physiological roles in humans are still being clarified, RNase A family members are under investigation as potential therapeutic agents due to their ability to degrade RNA and impact disease processes such as infection and cancer[5][3][6]. Note: "Ribonuclease A family member" is a generic entry; use a specific member name (e.g., Ribonuclease 1) for precise annotation and structured data capture[3][5][6].

Other names

Pancreatic ribonucleaseRibonuclease 1RNase A (bovine)RNase 1 (human)Ribonuclease family A member

Drugs or inhibitor proteins block enzymatic activity by binding to the ribonuclease active site, preventing RNA cleavage. Experimental approaches include using chemically modified ribonucleases or conjugates to selectively target cancer cells for RNA degradation and cytotoxicity.