1lm1
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| , resolution 2.80Å | |||||||
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| Ligands: | , , | ||||||
| Activity: | Glutamate synthase (ferredoxin), with EC number 1.4.7.1 | ||||||
| Related: | 1LLW, 1LLZ
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Structural studies on the synchronization of catalytic centers in glutamate synthase: native enzyme
OverviewOverview
The complex iron-sulfur flavoprotein glutamate synthase (GltS) plays a prominent role in ammonia assimilation in bacteria, yeasts, and plants. GltS catalyzes the formation of two molecules of l-glutamate from 2-oxoglutarate and l-glutamine via intramolecular channeling of ammonia. GltS has the impressive ability of synchronizing its distinct catalytic centers to avoid wasteful consumption of l-glutamine. We have determined the crystal structure of the ferredoxin-dependent GltS in several ligation and redox states. The structures reveal the crucial elements in the synchronization between the glutaminase site and the 2-iminoglutarate reduction site. The structural data combined with the catalytic properties of GltS indicate that binding of ferredoxin and 2-oxoglutarate to the FMN-binding domain of GltS induce a conformational change in the loop connecting the two catalytic centers. The rearrangement induces a shift in the catalytic elements of the amidotransferase domain, such that it becomes activated. This machinery, over a distance of more than 30 A, controls the ability of the enzyme to bind and hydrolyze the ammonia-donating substrate l-glutamine.
About this StructureAbout this Structure
1LM1 is a Single protein structure of sequence from Synechocystis sp.. Full crystallographic information is available from OCA.
ReferenceReference
Structural studies on the synchronization of catalytic centers in glutamate synthase., van den Heuvel RH, Ferrari D, Bossi RT, Ravasio S, Curti B, Vanoni MA, Florencio FJ, Mattevi A, J Biol Chem. 2002 Jul 5;277(27):24579-83. Epub 2002 Apr 19. PMID:11967268
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