Overview
Ribonuclease A (RNase A) is a globular enzyme belonging to the ribonuclease superfamily, originally isolated from bovine pancreas but also found in primates. It specifically cleaves single-stranded RNA after pyrimidine bases (cytosine and uracil), producing 3'-phosphorylated oligonucleotides. As a cornerstone tool in molecular biology since the 1950s, RNase A's mechanism was pivotal in understanding protein folding (Anfinsen's Nobel-winning work). Modern applications leverage its RNA-degrading properties while requiring stringent purity to avoid interference with DNA or protein samples.
Physical and Chemical Properties
RNase A is a compact 124-amino acid protein with four disulfide bonds, contributing to its remarkable stability. It retains activity across pH 2-9 and can refold after heat denaturation (reversible at ≤60°C). The enzyme requires no cofactors but is inhibited by heavy metals, uridine vanadate, and placental ribonuclease inhibitor (RI). Its isoelectric point is 9.3, facilitating binding to anion exchangers during purification. Commercial preparations are typically lyophilized powders with ≥60 Kunitz units/mg activity. Solutions exhibit UV absorption maxima at 278 nm (ε = 9,800 M−1cm−1).
Main Applications
In DNA extraction protocols, RNase A removes contaminating RNA to improve DNA purity for PCR or sequencing. Virology labs use it to distinguish RNA/DNA viruses via nucleic acid sensitivity tests. The pharmaceutical industry employs RNase A in manufacturing processes requiring RNA clearance, such as plasmid DNA or recombinant protein production. Research applications include RNA footprinting, mapping RNA-protein interactions, and studying enzyme kinetics. Recent biomedical studies explore RNase A's antitumor potential due to its ability to degrade extracellular RNA in tumor microenvironments. Specialty variants (e.g., RNase A-agarose conjugates) enable immobilized applications.
Safety and Storage
While non-toxic at working concentrations, RNase A powder is a respiratory irritant requiring NIOSH-approved dust masks during handling. Solutions should be prepared in fume hoods using gloves and eye protection. Contamination risks are severe in RNA work—dedicate separate equipment and workspace areas. Lyophilized RNase A is stable for years at -20°C in desiccated conditions. Working solutions (10 mg/mL in 10 mM Tris-HCl, pH 7.5) can be stored at 4°C for months. For RNA-free applications, heat-treat solutions at 100°C for 15 minutes to inactivate potential DNases. Always verify sterility for cell culture use.
B2B Procurement Guide
Industrial buyers should prioritize vendors providing certificates of analysis (CoA) detailing activity, endotoxin levels (<0.1 EU/μg for injectables), and absence of DNase/protease contaminants. Bulk pharmaceutical-grade purchases require GMP compliance documentation. Key specifications include: 1) Activity ≥60 Kunitz units/mg (measured via yeast RNA hydrolysis), 2) Protein purity ≥90% by SDS-PAGE, 3) Defined salt content for buffer compatibility. For cost efficiency, consider larger quantities (gram to kilogram scale) with stability-testing data. Temperature-controlled shipping is mandatory to preserve activity.
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