This gene controls the operator gene in cooperation with a chemical substance called inducer present in the cytoplasm. A regulator gene is not necessarily adjacent to the operator gene which it controls. The regulator gene codes for and produces a protein called repressor.
The Gram-positive bacteria include staphylococci (staph), streptococci (strep), pneumococci, and the bacterium responsible for diphtheria (Cornynebacterium diphtheriae) and anthrax (Bacillus anthracis). The Danish bacteriologist J.M.C. Gram (1853-1938) devised a method of staining bacteria using a dye called crystal (gentian) violet. Gram's method helps distinguish between different types of bacteria. The gram-staining characteristics of bacteria are denoted as positive or negative, depending upon whether the bacteria take up and retain the crystal violet stain or not.
In a gram stain, the Streptococcus pyogenes will be a purple color, indicating that it is a gram positive bacteria. The class Bacilli is a classification of cocci or rod shaped bacteria, and that is what the Streptococcus pyogenes are. Lactobacillales are an order of the gram positive bacteria comprising the lactic acid bacteria. Streptococcus pygenes produces lactic acid, so it is therefore classified under the lactobacillales. Streptococcaceae are gram positive non-sporulating bacteria including many parasitic, pathogenic and saprophytic forms.