3-Sulfinopropionyl-Coenzyme a (3Sp-Coa) Desulfinase from Advenella Mimigardefordensis Dpn7(T): Crystal Structure and Function of a Desulfinase with an Acyl-Coa Dehydrogenase Fold.Schurmann, M., Meijers, R., Schneider, T.R., Steinbuchel, A., Cianci, M.
(2015) Acta Crystallogr.,Sect.D 71: 1360
- PubMed: 26057676
- DOI: 10.1107/S1399004715006616
- Primary Citation of Related Structures:
- PubMed Abstract:
3-Sulfinopropionyl-coenzyme A (3SP-CoA) desulfinase (AcdDPN7; EC 22.214.171.124) was identified during investigation of the 3,3'-dithiodipropionic acid (DTDP) catabolic pathway in the betaproteobacterium Advenella mimigardefordensis strain DPN7(T). DTDP is ...
3-Sulfinopropionyl-coenzyme A (3SP-CoA) desulfinase (AcdDPN7; EC 126.96.36.199) was identified during investigation of the 3,3'-dithiodipropionic acid (DTDP) catabolic pathway in the betaproteobacterium Advenella mimigardefordensis strain DPN7(T). DTDP is an organic disulfide and a precursor for the synthesis of polythioesters (PTEs) in bacteria, and is of interest for biotechnological PTE production. AcdDPN7 catalyzes sulfur abstraction from 3SP-CoA, a key step during the catabolism of DTDP. Here, the crystal structures of apo AcdDPN7 at 1.89 Å resolution and of its complex with the CoA moiety from the substrate analogue succinyl-CoA at 2.30 Å resolution are presented. The apo structure shows that AcdDPN7 belongs to the acyl-CoA dehydrogenase superfamily fold and that it is a tetramer, with each subunit containing one flavin adenine dinucleotide (FAD) molecule. The enzyme does not show any dehydrogenase activity. Dehydrogenase activity would require a catalytic base (Glu or Asp residue) at either position 246 or position 366, where a glutamine and a glycine are instead found, respectively, in this desulfinase. The positioning of CoA in the crystal complex enabled the modelling of a substrate complex containing 3SP-CoA. This indicates that Arg84 is a key residue in the desulfination reaction. An Arg84Lys mutant showed a complete loss of enzymatic activity, suggesting that the guanidinium group of the arginine is essential for desulfination. AcdDPN7 is the first desulfinase with an acyl-CoA dehydrogenase fold to be reported, which underlines the versatility of this enzyme scaffold.
Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany.