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The ade6-M26 mutation in the fission yeast Schizosaccharomyces pombe creates a meiotic homologous recombination hot spot. We have achieved 40,000-fold purification of a heterodimeric DNA-binding protein, Mts1/Mts2, that activates the recombination hot spot. Physical studies suggested the presence of a third subunit. It is demonstrated here that RNA molecules of approximately 210 nucleotides copurified with the heterodimer. To characterize the RNA component, it was necessary to develop a new strategy for cloning of the unknown, low-abundance, partially degraded RNAs that were present in purified Mts1/Mts2 protein preparations. The strategy uses RNA ligase to add DNA oligonucleotide priming sites to the RNA for subsequent reverse transcription and PCR (RNA ligase, reverse transcription-PCR, or RL/RT/PCR). This cloning procedure could be applied to the cloning of any unknown RNA or DNA molecules. Because the cDNA clones obtained from Mts1/Mts2 were largely heterogeneous, it seems likely that the RNAs copurified as a result of tight but nonspecific interactions with the heterodimeric protein.

genome research

RNA associated with a heterodimeric protein that activates a meiotic homologous recombination hot spot: RL/RT/PCR strategy for cloning any unknown RNA or DNA.