title: Deletion of the N-terminal region of Xenopus transcription factor IIIA inhibits specific binding to the 5 S RNA gene.
abstract: Xenopus transcription factor IIIA (TFIIIA) is expressed in Escherichia coli by utilizing one plasmid with a T7 RNA polymerase gene and another plasmid with TFIIIA cDNA cloned downstream of a T7 promoter. Wild-type TFIIIA and a TFIIIA deletion mutant, isolated from E. coli cell extracts, are identified by antiserum against native TFIIIA purified from Xenopus immature oocytes. DNase I protection experiments indicate that wild-type TFIIIA, synthesized from a full-length TFIIIA cDNA, binds specifically to the coding and noncoding strands of the 5 S RNA gene. The TFIIIA deletion mutant, expressed from TFIIIA cDNA lacking the coding sequence for the N-terminal 29 amino acids, fails to bind specifically to the 5 S RNA gene as judged by its inability to protect to any degree the coding or noncoding strands of the gene from DNase I digestion. Both wild-type TFIIIA and the N-terminal deletion mutant promote DNA renaturation.
mesh_terms: D000818:Animals; D002872:Chromosome Deletion; D004247:DNA / Q000378:metabolism; D004262:DNA Restriction Enzymes / Q000378:metabolism; D015246:Deoxyribonuclease EcoRI; D003850:Deoxyribonuclease I / Q000378:metabolism; D015252:Deoxyribonucleases, Type II Site-Specific; D004926:Escherichia coli / Q000235:genetics; D012313:RNA / Q000378:metabolism*; D035582:Transcription Factor TFIIIA; D014157:Transcription Factors / Q000235:genetics*; D014981:Xenopus
chemical_list: D035582:Transcription Factor TFIIIA; D014157:Transcription Factors; D012313:RNA; D004247:DNA; D004262:DNA Restriction Enzymes; D015246:Deoxyribonuclease EcoRI; D003850:Deoxyribonuclease I; C024388:CTGCAG-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific