2d3c

Crystal Structure of the Maize Glutamine Synthetase complexed with ADP and Phosphinothricin Phosphate

spinqualitylabelsall models 2d3c, resolution 3.81Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2d3c is a 10 chain structure with sequence from Maize. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ADP, MN, P3P Related: 2d3a, 2d3b Gene: gs1a (MAIZE) Activity: Glutamate--ammonia ligase, with EC number 6.3.1.2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [GLNA3_MAIZE] Plays a role in the flow of nitrogen into nitrogenous organic compounds. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Plants provide nourishment for animals and other heterotrophs as the sole primary producer in the food chain. Glutamine synthetase (GS), one of the essential enzymes for plant autotrophy catalyzes the incorporation of ammonia into glutamate to generate glutamine with concomitant hydrolysis of ATP, and plays a crucial role in the assimilation and re-assimilation of ammonia derived from a wide variety of metabolic processes during plant growth and development. Elucidation of the atomic structure of higher plant GS is important to understand its detailed reaction mechanism and to obtain further insight into plant productivity and agronomical utility. Here we report the first crystal structures of maize (Zea mays L.) GS. The structure reveals a unique decameric structure that differs significantly from the bacterial GS structure. Higher plants have several isoenzymes of GS differing in heat stability and catalytic properties for efficient responses to variation in the environment and nutrition. A key residue responsible for the heat stability was found to be Ile-161 in GS1a. The three structures in complex with substrate analogues, including phosphinothricin, a widely used herbicide, lead us to propose a mechanism for the transfer of phosphate from ATP to glutamate and to interpret the inhibitory action of phosphinothricin as a guide for the development of new potential herbicides. Atomic structure of plant glutamine synthetase: a key enzyme for plant productivity.,Unno H, Uchida T, Sugawara H, Kurisu G, Sugiyama T, Yamaya T, Sakakibara H, Hase T, Kusunoki M J Biol Chem. 2006 Sep 29;281(39):29287-96. Epub 2006 Jul 7. PMID:16829528 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glutamine synthetase

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