Involved in glutamate biosynthesis and plays a major role in the primary ammonium ions assimilation in seedling roots. May be involved in the reutilization of glutamine in developing organs. Plays a role in the development of tillers. Oryza sativa subsp. japonica (taxid: 39947) EC: 1EC: .EC: 4EC: .EC: 1EC: .EC: 1EC: 4
Involved in glutamate biosynthesis. Required for non-photorespiratory ammonium assimilation. Probably involved in primary ammonium assimilation in roots.
Score = 102 bits (255), Expect = 5e-22, Method: Composition-based stats.
Identities = 52/118 (44%), Positives = 68/118 (57%), Gaps = 20/118 (16%)
Query: 1 MGNDAPLACLSEFQPLLYDYFKQLFAQLLPVLLSVTTMYCSLSLQVTNPPIDPFREKVVM 60
MGNDAPLACL+E LLYDYF+QLFAQ VTNPPIDP RE VM
Sbjct: 544 MGNDAPLACLNENPVLLYDYFRQLFAQ------------------VTNPPIDPIREANVM 585
Query: 61 SLMCPIGPEANILEPSAKQCHRLFLPNPLLSLYDLEVIR--LNTHRGWKVMKVSLMAD 116
SL C +GP+ N+LE + QC RL L +P+L + + ++ + W V ++ + D
Sbjct: 586 SLECYVGPQGNLLEMHSSQCDRLLLKSPILHWNEFQALKNIEAAYPSWSVAEIDITFD 643
Forms L-glutamate from L-glutamine and 2-oxoglutarate. Represents an alternative pathway to L-glutamate dehydrogenase for the biosynthesis of L-glutamate. Participates with glutamine synthetase in ammonia assimilation processes. The enzyme is specific for NADH, L-glutamine and 2-oxoglutarate.
The central domain of glutamate synthase connects the amino terminal amidotransferase domain with the FMN-binding domain and has an alpha / beta overall topology. This domain appears to be a rudimentary form of the FMN-binding TIM barrel according to SCOP. Length = 288
>PF04898 Glu_syn_central: Glutamate synthase central domain; InterPro: IPR006982 Glutamate synthase (GltS)1 is a key enzyme in the early stages of the assimilation of ammonia in bacteria, yeasts, and plants
In bacteria, L-glutamate is involved in osmoregulation, is the precursor for other amino acids, and can be the precursor for haem biosynthesis. In plants, GltS is especially essential in the reassimilation of ammonia released by photorespiration. On the basis of the amino acid sequence and the nature of the electron donor, three different classes of GltS can de defined as follows: 1) ferredoxin-dependent GltS (Fd-GltS), 2) NADPH-dependent GltS (NADPH-GltS), and 3) NADH-dependent GltS (properties of the three classes have been reviewed extensively []). The enzyme is a complex iron-sulphur flavoprotein catalysing the reductive transfer of the amido nitrogen from L-glutamine to 2-oxoglutarate to form two molecules of L-glutamate via intramolecular channelling of ammonia from the amidotransferase domain to the FMN-binding domain. Reaction of amidotransferase domain: L-glutamine + H2O = L-glutamate + NH3 Reactions of FMN-binding domain: 2-oxoglutarate + NH3 = 2-iminoglutarate + H2O 2e + FMNox = FMNred 2-iminoglutarate + FMNred = L-glutamate + FMNox The central domain of glutamate synthase connects the N-terminal amidotransferase domain with the FMN-binding domain and has an alpha/beta overall topology [].; GO: 0015930 glutamate synthase activity, 0006807 nitrogen compound metabolic process, 0055114 oxidation-reduction process; PDB: 1EA0_A 2VDC_E 1OFE_A 1LLW_A 1OFD_A 1LLZ_A 1LM1_A.
>pdb|2VDC|A Chain A, The 9.5 A Resolution Structure Of Glutamate Synthase From Cryo-Electron Microscopy And Its Oligomerization Behavior In Solution: Functional Implications. Length = 1472