title: Desulfurization of 2,4,6,8-tetraethyl dibenzothiophene by recombinant Mycobacterium sp. strain MR65.
abstract: Recombinant Mycobacterium sp. strain MR65 harboring dszABCD genes was used to desulfurize alkyl dibenzothiophenes (Cx-DBTs) in n-hexadecane. The specific desulfurization activity for 2,4,6,8-tetraethyl DBT (C8-DBT) by DszC enzyme was about twice that for 4,6-dipropyl DBT (C6-DBT). However, the degradation rate of 2,4,6,8-tetraethyl DBT in n-hexadecane by resting cells of strain MR65 was only about 40% of that of 4,6-dipropyl DBT. These results indicated that the desulfurization ability for Cx-DBTs by resting cells depends on carbon number substituted at positions 4 and 6 and that the rate-limiting step in the desulfurization reaction of highly alkylated Cx-DBTs is the transfer process from the oil phase into the cell.
mesh_terms: D000478:Alkylation; D001673:Biodegradation, Environmental; D004789:Enzyme Activation; D009161:Mycobacterium / Q000145:classification / Q000235:genetics* / Q000378:metabolism*; D010088:Oxidoreductases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D011994:Recombinant Proteins / Q000378:metabolism; D013045:Species Specificity; D013455:Sulfur / Q000737:chemistry / Q000378:metabolism*; D013876:Thiophenes / Q000737:chemistry / Q000378:metabolism*
chemical_list: D011994:Recombinant Proteins; D013876:Thiophenes; D013455:Sulfur; D010088:Oxidoreductases; C090100:dibenzothiophene monooxygenase; C016366:dibenzothiophene