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Transcription of 5S RNA gene in Xenopus oocytes requires a 38 kDa transcription factor TFIIIA, which interacts with the 50 bp internal control region of the gene. We looked for TFIIIA-like polypeptides in the extracts of adult Xenopus tissues on the basis of their antigenic cross-reactivity to anti-TFIIIA antibody. Several species of polypeptides ranging from 30 to 50 kDa were found in kidney, stomach, liver and testis. Although these polypeptides reacted specifically to anti-TFIIIA antibody, proteolytic peptide mapping of three representative ones did not reveal any mutual similarities. They also seemed to be distinct from TFIIIA. Possible functions of these proteins are discussed.

Presence of multimple species of polypeptides immunologically related to transcription factor TFIIIA in adultXenopus tissues