CATH Classification
| Level | CATH Code | Description |
|---|---|---|
|
3 | Alpha Beta |
|
3.90 | Alpha-Beta Complex |
|
3.90.1300 | Amidase signature (AS) enzymes |
|
3.90.1300.10 | Amidase signature (AS) domain |
Domain Context
CATH Clusters
| Superfamily | Amidase signature (AS) domain |
| Functional Family |
Enzyme Information
| 6.3.5.7 |
Glutaminyl-tRNA synthase (glutamine-hydrolyzing).
based on mapping to UniProt P63488
ATP + L-glutamyl-tRNA(Gln) + L-glutamine = ADP + phosphate + L-glutaminyl-tRNA(Gln) + L-glutamate.
-!- In systems lacking discernible glutamine--tRNA ligase (EC 6.1.1.18), glutaminyl-tRNA(Gln) is formed by a two-enzyme system. -!- In the first step, a nondiscriminating ligase (EC 6.1.1.24) mischarges tRNA(Gln) with glutamate, forming glutamyl-tRNA(Gln). -!- The glutamyl-tRNA(Gln) is not used in protein synthesis until the present enzyme converts it into glutaminyl-tRNA(Gln) (glutamyl- tRNA(Glu) is not a substrate for this enzyme). -!- A glutaminase subunit (cf. EC 3.5.1.2) produces an ammonia molecule that is transferred by a 30 A tunnel to a synthase subunit, where it is ligated to the carboxy group that has been activated by phosphorylation. -!- Some bacterial GatCAB complexes also has the activity of EC 6.3.5.6.
|
UniProtKB Entries (1)
| P64201 |
GATB_STAAM
Staphylococcus aureus subsp. aureus Mu50
Aspartyl/glutamyl-tRNA(Asn/Gln) amidotransferase subunit B
|
PDB Structure
| PDB | 2F2A |
| External Links | |
| Method | X-RAY DIFFRACTION |
| Organism | Escherichia |
| Primary Citation |
Ammonia channel couples glutaminase with transamidase reactions in GatCAB
Science
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