4q75
From Proteopedia
Crystal structure of Nfs2, the plastidial cysteine desulfurase from Arabidopsis thaliana
Structural highlights
FunctionCNIF1_ARATH Catalyzes the removal of elemental sulfur and selenium atoms from L-cysteine, L-cystine, L-selenocysteine, and L-selenocystine to produce L-alanine (PubMed:12033984, PubMed:16455656). Supplies the inorganic sulfur for iron-sulfur (Fe-S) clusters (PubMed:15480755, PubMed:17372218). Required for the maturation of all plastidic Fe-S proteins and, thus, essential for plant growth (PubMed:17372218).[1] [2] [3] [4] Publication Abstract from PubMedThe chloroplastic Arabidopsis thaliana Nfs2 (AtNfs2) is a group II pyridoxal 5'-phosphate-dependent cysteine desulfurase that is involved in the initial steps of iron-sulfur cluster biogenesis. The group II cysteine desulfurases require the presence of sulfurtransferases such as SufE proteins for optimal activity. Compared with group I cysteine desulfurases, proteins of this group contains a smaller extended lobe harbouring the catalytic cysteine and have a beta-hairpin constraining the active site. Here, two crystal structures of AtNfs2 are reported: a wild-type form with the catalytic cysteine in a persulfide-intermediate state and a C384S variant mimicking the resting state of the enzyme. In both structures the well conserved Lys241 covalently binds pyridoxal 5'-phosphate, forming an internal aldimine. Based on available homologous bacterial complexes, a model of a complex between AtNfs2 and the SufE domain of its biological partner AtSufE1 is proposed, revealing the nature of the binding sites. X-ray structures of Nfs2, the plastidial cysteine desulfurase from Arabidopsis thaliana.,Roret T, Pegeot H, Couturier J, Mulliert G, Rouhier N, Didierjean C Acta Crystallogr F Struct Biol Commun. 2014 Sep 1;70(Pt 9):1180-5. doi:, 10.1107/S2053230X14017026. Epub 2014 Aug 29. PMID:25195888[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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