these mutations affect the sigma subunit of dna-dependent rna polymerase ( ribonucleoside 5'-triphosphate : rna nucleotidyltransferase , ec 2.7.7.6 ) by abolishing the expression of the lambda n gene , and they are closely lniked to dnag in the order dnag-grn-uxaa .
C0035681
dna-dependent rna polymerase
C0035673
rna