Dept. of Immunology, University Hospital, Hamburg, F.R.G.
A single-step immunoaffinity purification procedure for the rat T cell marker RT6.2 is described which permits the isolation of microgram quantities of protein from the RT6.2+ T-T hybridoma EpD3. The amino terminus was sequenced directly from a polyvinylidene (PVDF) membrane blot prepared after SDS-PAGE. Further internal sequence data were obtained from peptides generated from purified RT6.2 digested with different endoproteases and separated by reverse-phase micro-HPLC. A computer search in data banks did not reveal any significant homology to other proteins.