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Preparation of recombinant rat eosinophil-associated ribonuclease-1 and -2 and analysis of their biological activities.

Biochim. Biophys. Acta. 2003 Jul 14;1638(2):164-72
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摘要


Rat eosinophils contain eosinophil-associated ribonucleases (Ears) in their granules. Ears are thought to be synthesized as pre-forms and stored in the granules as mature forms. However, the N-terminal amino acid of mature Ear-1 and Ear-2 is still controversial. Therefore, we prepared two recombinant mature forms of Ear-1 and Ear-2 in which the N-terminal amino acids are Ser24 (S) [Ear-1 (S) and Ear-2 (S)] and Gln26 (Q) [Ear-1 (Q) and Ear-2 (Q)], and analyzed their biological activities by comparing them with those of pre-form Ear-1 and pre-form Ear-2. The four mature Ears showed RNase A activity as well as bovine pancreatic RNase A activity, but pre-Ear-1 and pre-Ear-2 showed no RNase A activity. Mature Ear-1 (Q) and mature Ear-2 (Q) showed more potent RNase A activity than mature Ear-1 (S) and mature Ear-2 (S), respectively. The RNase A activities of mature Ear-1 (Q) and mature Ear-2 (Q) were reduced by treatment at 96 degrees C for 20 min or with RNase inhibitor. The growth of Escherichia coli was inhibited by both pre-Ears and mature Ears in a concentration-dependent manner, and was almost completely suppressed at 1.0 microM. The bactericidal activities of mature Ear-1 (Q) and mature Ear-2 (Q) were not inhibited by RNase inhibitor, but was increased by treatment at 96 degrees C for 20 min.

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