Early sporulation gene spo0F: nucleotide sequence and analysis of gene product

We have determined the sequence of a 1,162-base-pair DNA fragment containing a spo0F gene which is required for an early stage of sporulation in Bacillus subtilis. The sequence has only one long open reading frame consisting of 173 codons, which has been confirmed to be the spo0F cistron by DNA-mediated transformation and in vitro transcription. In UV-irradiated "maxicells" containing pUBSF13, the plasmid that carries cloned spo0F gene, we have observed the synthesis of a 20-kilodalton polypeptide that is absent from cells carrying a vector plasmid pUB110. The molecular weight of this protein is in agreement with the calculated molecular weight of the spo0F gene product (Mr, 19,065). The putative promoter sequences of spo0F gene were 5' T-A-T-A-A-T 3' at -10 and 5' T-T-G-A-T-T 3' at -35. An octamer sequence, 5' A-A-A-G-G-A-G-G 3', situated 8 base pairs prior to the initiation codon was found to be perfectly complementary with the 3' end of 16S ribosomal RNA. This result offers additional evidence for the proposal by Rabinowitz's group that an extensive mRNA-rRNA interaction is a requirement for efficient translation by B. subtilis ribosomes.