Fractionation of transfer RNA on Sepharose 4B. Effects of Sepharose batch differences

Hydrophobic interaction chromatography of incompletely methylated transfer RNA from Escherichia coli on octyl-sepharose

Phenylalanine-specific transfer RNA from methionine-starved relaxed Escherichia coli K12 separates into two components when chromatographed on Octyl-Sepharose. The difference in elution between the two tRNAs has been shown to depend on the methyl group in the highly modified 2-methylthio-N-6-isopentenyladenosine. The first eluted tRNAPhe lacks this methyl group, while the last eluted tRNAPhe is fully methylated. Other differences in the modification patterns have no effect on the elution from Octyl-Sepharose. The elution pattern of tyrosine- and serine-specific tRNAs, also normally containing ms2i6A, is similar.

High-performance liquid chromatographic separations on dihydroxyboryl-agarose

This paper (which is part of a series of articles on high-performance liquid chromatographic separations on agarose columns) describes the chromatographic behaviour of catecholamines, nucleosides, aminoacylated and non-aminoacylated tRNA, and glycosylated and non-glycosylated hemoglobins on agarose matrices derivatized with m-aminophenylboronic acid. These matrices primarily bind molecules with two vicinal hydroxy groups in the cis-configuration. The possible existence of secondary electrostatic and hydrophobic interactions has been studied with the aid of diagrams showing retention time as a function of pH and buffer concentration.