The soil-dwelling bacterium makes antibiotics
The information will be used to develop more powerful medicines to fight superbugs and even cancer.
The bacterium, known as Streptomyces coelicolor, is found in the soil.
It is a natural antibiotic factory, making drugs that fight infection.
Together with other members of the same family, the bug produces two-thirds of all natural antibiotics.
It also makes drugs used to treat cancer or stop organs being rejected by the human body after transplant operations.
Microbe war
Biotech companies say they may be able to make new drugs from scratch using genetic knowledge of the bacterium.
They now know the biochemical instructions for the machinery the bug uses to make antibiotics.
The eight million or so DNA "letters" of the bug's genome are organised into 20 groups of genes.
"This organism has twice as many genes as typical free-living bacteria. You could say it's a boy scout - it's prepared. You've got the core of the chromosome, and then there are arms which are not essential but do useful things, like making antibiotics."
New antibiotics are needed to fight the rise of superbugs - bacteria that have become resistant to common antibiotics used to fight disease.
The most notorious of these is methicillin-resistant Staphylococcus aureus, a bug that infects wounds and has become rife in hospitals.
The completed genome of this bacterium was recently published by Japanese researchers.
The Streptomyces data are published in the scientific journal Nature.