A fluorimetric assay for available lysine in proteins

A two-dimensional fingerprinting gel system that provides sensitive analyses with high resolution of T1-resistant oligonucleotides of large RNA molecules is described. Unique oligonucleotides less than 30 bases in length are recovered quantitatively while longer oligonucleotides are recovered in very large (～90%) yields by active transfer of the fingerprint to DEAE paper. After elution of the oligonucleotides from DEAE paper, secondary analysis is performed by digestion of oligonucleotides with pancreatic RNase and separation of the products by high-voltage electrophoresis on polyethyleneimine cellulose. The complete analysis of up to 40 oligonucleotides can be accomplished within 4 days.