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Antigen‐specific T cell suppressor factor (TsF): isolation of a cDNA clone encoding for a functional polypeptide chain of phosphorylcholine‐specific TsF

A cDNA library of phosphorylcholine (PC)‐specific suppressor T hybridoma, 29‐C‐6, was constructed. By differential colony hybridization, 68 colonies were selected which hybridized with mRNA probes of two PC‐specific suppressor T hybridomas, 29‐C‐6 and 09‐M‐24–8, but not with those of BW5147. A hybridization translation assay revealed that only one combination of translation products of cDNA clones, p6–1 and p6–5, showed strong PC‐T cell suppressor factor (TsF) activity. Sequence analysis showed that p6–5 contained a specific cDNA sequence of about 800 base pairs (bp) while p6–1 had a 190 bp poly(A) sequence insert.