5TG0
Crystal structure of the dimethylsulfoniopropionate (DMSP) lyase DddK complexed with iron and zinc
Summary for 5TG0
| Entry DOI | 10.2210/pdb5tg0/pdb |
| Related | 5TFZ |
| Descriptor | dimethylsulfoniopropionate lyase DddK, FE (III) ION, ZINC ION, ... (4 entities in total) |
| Functional Keywords | dmsp lyase, cupin, nickel dependent, metal binding, lyase |
| Biological source | Pelagibacter ubique (strain HTCC1062) |
| Total number of polymer chains | 1 |
| Total formula weight | 16732.90 |
| Authors | Schnicker, N.J.,Dey, M. (deposition date: 2016-09-27, release date: 2017-06-14, Last modification date: 2024-03-06) |
| Primary citation | Schnicker, N.J.,De Silva, S.M.,Todd, J.D.,Dey, M. Structural and Biochemical Insights into Dimethylsulfoniopropionate Cleavage by Cofactor-Bound DddK from the Prolific Marine Bacterium Pelagibacter. Biochemistry, 56:2873-2885, 2017 Cited by PubMed Abstract: Enormous amounts of the organic osmolyte dimethylsulfoniopropionate (DMSP) are produced in marine environments where bacterial DMSP lyases cleave it, yielding acrylate and the climate-active gas dimethyl sulfide (DMS). SAR11 bacteria are the most abundant clade of heterotrophic bacteria in the oceans and play a key role in DMSP catabolism. An important environmental factor affecting DMS generation via DMSP lyases is the availability of metal ions because they are essential cofactors for many of these enzymes. Here we examine the structure and activity of DddK in the presence of various metal ions. We have established that DddK containing a double-stranded β-helical motif utilizes various divalent metal ions as cofactors for catalytic activity. However, nickel, an abundant metal ion in marine environments, adopts a distorted octahedral coordination environment and conferred the highest DMSP lyase activity. Crystal structures of cofactor-bound DddK reveal key metal ion binding and catalytic residues and provide the first rationalization for varying activities with different metal ions. The structures of DddK along with site-directed mutagenesis and ultraviolet-visible studies are consistent with Tyr 64 acting as a base to initiate the β-elimination reaction of DMSP. Our biochemical and structural studies provide a detailed understanding of DMS generation by one of the ocean's most prolific bacteria. PubMed: 28511016DOI: 10.1021/acs.biochem.7b00099 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.44 Å) |
Structure validation
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