Identification of 3-Sulfinopropionyl Coenzyme A (CoA) Desulfinases within the Acyl-CoA Dehydrogenase Superfamily

ABSTRACT In a previous study, the essential role of 3-sulfinopropionyl coenzyme A (3SP-CoA) desulfinase acyl-CoA dehydrogenase (Acd) in Advenella mimigardefordensis strain DPN7T (AcdDPN7) during degradation of 3,3′-dithiodipropionic acid (DTDP) was elucidated. DTDP is a sulfur-containing precursor substrate for biosynthesis of polythioesters (PTEs). AcdDPN7 showed high amino acid sequence similarity to acyl-CoA dehydrogenases but was unable to catalyze a dehydrogenation reaction. Hence, it was investigated in the present study whether 3SP-CoA desulfinase activity is an uncommon or a widespread property within the acyl-CoA dehydrogenase superfamily. Therefore, proteins of the acyl-CoA dehydrogenase superfamily from Advenella kashmirensis WT001, Bacillus cereus DSM31, Cupriavidus necator N-1, Escherichia coli BL21, Pseudomonas putida KT2440, Burkholderia xenovorans LB400, Ralstonia eutropha H16, Variovorax paradoxus B4, Variovorax paradoxus S110, and Variovorax paradoxus TBEA6 were expressed in E. coli strains. All purified acyl-CoA dehydrogenases appeared as homotetramers, as revealed by size exclusion chromatography. AcdS110, AcdB4, AcdH16, and AcdKT2440 were able to dehydrogenate isobutyryl-CoA. AcdKT2440 additionally dehydrogenated butyryl-CoA and valeryl-CoA, whereas AcdDSM31 dehydrogenated only butyryl-CoA and valeryl-CoA. No dehydrogenation reactions were observed with propionyl-CoA, isovaleryl-CoA, succinyl-CoA, and glutaryl-CoA for any of the investigated acyl-CoA dehydrogenases. Only AcdTBEA6, AcdN-1, and AcdLB400 desulfinated 3SP-CoA and were thus identified as 3SP-CoA desulfinases within the acyl-CoA dehydrogenase family, although none of these three Acds dehydrogenated any of the tested acyl-CoA thioesters. No appropriate substrates were identified for AcdBL21 and AcdWT001. Spectrophotometric assays provided apparent Km and Vmax values for active substrates and indicated the applicability of phylogenetic analyses to predict the substrate range of uncharacterized acyl-CoA dehydrogenases. Furthermore, C. necator N-1 was found to utilize 3SP as the sole source of carbon and energy.

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