2NV2
Structure of the PLP synthase complex Pdx1/2 (YaaD/E) from Bacillus subtilis
Summary for 2NV2
| Entry DOI | 10.2210/pdb2nv2/pdb |
| Related | 1R9G 1ZNN 2NV0 2NV1 |
| Descriptor | Pyridoxal biosynthesis lyase pdxS, Glutamine amidotransferase subunit pdxT, CHLORIDE ION, ... (6 entities in total) |
| Functional Keywords | (beta/alpha)8-barrel, 3-layer(aba) sandwich, plp synthase complex, lyase-transferase complex, lyase/transferase |
| Biological source | Bacillus subtilis More |
| Total number of polymer chains | 24 |
| Total formula weight | 653303.74 |
| Authors | Strohmeier, M.,Tews, I.,Sinning, I. (deposition date: 2006-11-10, release date: 2006-12-05, Last modification date: 2023-10-25) |
| Primary citation | Strohmeier, M.,Raschle, T.,Mazurkiewicz, J.,Rippe, K.,Sinning, I.,Fitzpatrick, T.B.,Tews, I. Structure of a bacterial pyridoxal 5'-phosphate synthase complex Proc.Natl.Acad.Sci.Usa, 103:19284-19289, 2006 Cited by PubMed Abstract: Vitamin B6 is an essential metabolic cofactor that has more functions in humans than any other single nutrient. Its de novo biosynthesis occurs through two mutually exclusive pathways that are absent in animals. The predominant pathway found in most prokaryotes, fungi, and plants has only recently been discovered. It is distinguished by a glutamine amidotransferase, which is remarkable in that it alone can synthesize the cofactor form, pyridoxal 5'-phosphate (PLP), directly from a triose and a pentose saccharide and glutamine. Here we report the 3D structure of the PLP synthase complex with substrate glutamine bound as well as those of the individual synthase and glutaminase subunits Pdx1 and Pdx2, respectively. The complex is made up of 24 protein units assembled like a cogwheel, a dodecameric Pdx1 to which 12 Pdx2 subunits attach. In contrast to the architecture of previously determined glutamine amidotransferases, macromolecular assembly is directed by an N-terminal alpha-helix on the synthase. Interaction with the synthase subunit leads to glutaminase activation, resulting in formation of an oxyanion hole, a prerequisite for catalysis. Mutagenesis permitted identification of the remote glutaminase and synthase catalytic centers and led us to propose a mechanism whereby ammonia shuttles between these active sites through a methionine-rich hydrophobic tunnel. PubMed: 17159152DOI: 10.1073/pnas.0604950103 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.12 Å) |
Structure validation
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