| pubmed-article:2503677 | pubmed:abstractText | It has previously been shown that spollAC561, a mutation that diminishes the incidence of sporulation by more than six orders of magnitude, alters the residue at position 13 of the helix-turn-helix region of the sporulation-specific sigma factor encoded by spollAC from valine to methionine (Yudkin, 1987b). We have now found that four spontaneous revertants, which sporulate at an incidence of 30-60%, all contain transitions within the codon that was altered by spo-561. The mutant methionine is replaced by isoleucine in two revertants, and by threonine in the other two. | lld:pubmed |
