4z7c

Diphosphomevalonate decarboxylase from the Sulfolobus solfataricus, space group h32

spinqualitylabelsall models 4z7c, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4z7c is a 1 chain structure with sequence from Saccharolobus solfataricus P2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL, NA, PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DMD_SACS2 Catalyzes the decarboxylation of mevalonate 5-diphosphate (MVAPP) to isopentenyl diphosphate (IPP). Functions in the mevalonate (MVA) pathway leading to IPP, a key precursor for the biosynthesis of isoprenoid compounds such as archaeal membrane lipids. Publication Abstract from PubMed In the present study, the crystal structure of recombinant diphosphomevalonate decarboxylase from the hyperthermophilic archaeon Sulfolobus solfataricus was solved as the first example of an archaeal and thermophile-derived diphosphomevalonate decarboxylase. The enzyme forms a homodimer, as expected for most eukaryotic and bacterial orthologs. Interestingly, the subunits of the homodimer are connected via an intersubunit disulfide bond, which presumably formed during the purification process of the recombinant enzyme expressed in Escherichia coli. When mutagenesis replaced the disulfide-forming cysteine residue with serine, however, the thermostability of the enzyme was significantly lowered. In the presence of beta-mercaptoethanol at a concentration where the disulfide bond was completely reduced, the wild-type enzyme was less stable to heat. Moreover, Western blot analysis combined with nonreducing SDS-PAGE of the whole cells of S. solfataricus proved that the disulfide bond was predominantly formed in the cells. These results suggest that the disulfide bond is required for the cytosolic enzyme to acquire further thermostability and to exert activity at the growth temperature of S. solfataricus. IMPORTANCE: This study is the first report to describe the crystal structures of archaeal diphosphomevalonate decarboxylase, an enzyme involved in the classical mevalonate pathway. A stability-conferring intersubunit disulfide bond is a remarkable feature that is not found in eukaryotic and bacterial orthologs. The evidence that the disulfide bond also is formed in S. solfataricus cells suggests its physiological importance. In Vivo Formation of the Protein Disulfide Bond That Enhances the Thermostability of Diphosphomevalonate Decarboxylase, an Intracellular Enzyme from the Hyperthermophilic Archaeon Sulfolobus solfataricus.,Hattori A, Unno H, Goda S, Motoyama K, Yoshimura T, Hemmi H J Bacteriol. 2015 Nov 1;197(21):3463-71. doi: 10.1128/JB.00352-15. Epub 2015 Aug , 24. PMID:26303832 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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