Figure 3: Biodesulfurization of DBT. (a) conversion of DBT to DBT sulphoxide by DBT monooxygenase; (b) conversion DBT sulphoxide to DBT sulphone by DBT monooxygenase; (c) conversion of DBT sulphone to HBPS by DBT sulfone monooxygenase and (d) conversion of HBPS to HBP by HBPS desulfinase.