Q017T9 · PURA_OSTTA
- ProteinAdenylosuccinate synthetase, chloroplastic
- GenePURA
- StatusUniProtKB reviewed (Swiss-Prot)
- Organism
- Amino acids480 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
Plays an important role in the de novo pathway and in the salvage pathway of purine nucleotide biosynthesis. Catalyzes the first committed step in the biosynthesis of AMP from IMP.
Catalytic activity
- IMP + L-aspartate + GTP = N6-(1,2-dicarboxyethyl)-AMP + GDP + phosphate + 2 H+
Cofactor
Note: Binds 1 Mg2+ ion per subunit.
Pathway
Purine metabolism; AMP biosynthesis via de novo pathway; AMP from IMP: step 1/2.
Features
Showing features for binding site, active site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Binding site | 69-75 | GTP (UniProtKB | ChEBI) | ||||
Sequence: GDEGKGK | ||||||
Active site | 70 | Proton acceptor | ||||
Sequence: D | ||||||
Binding site | 70 | Mg2+ (UniProtKB | ChEBI) | ||||
Sequence: D | ||||||
Binding site | 70-73 | IMP (UniProtKB | ChEBI); ligand shared between dimeric partners; in other chain | ||||
Sequence: DEGK | ||||||
Binding site | 95-98 | IMP (UniProtKB | ChEBI); ligand shared between dimeric partners; in other chain | ||||
Sequence: NAGH | ||||||
Binding site | 97 | Mg2+ (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Binding site | 97-99 | GTP (UniProtKB | ChEBI) | ||||
Sequence: GHT | ||||||
Active site | 98 | Proton donor | ||||
Sequence: H | ||||||
Binding site | 187 | IMP (UniProtKB | ChEBI); ligand shared between dimeric partners; in other chain | ||||
Sequence: T | ||||||
Binding site | 201 | IMP (UniProtKB | ChEBI); ligand shared between dimeric partners | ||||
Sequence: R | ||||||
Binding site | 278 | IMP (UniProtKB | ChEBI); ligand shared between dimeric partners; in other chain | ||||
Sequence: N | ||||||
Binding site | 293 | IMP (UniProtKB | ChEBI); ligand shared between dimeric partners; in other chain | ||||
Sequence: T | ||||||
Binding site | 353-359 | substrate | ||||
Sequence: TTTGRPR | ||||||
Binding site | 357 | IMP (UniProtKB | ChEBI); ligand shared between dimeric partners; in other chain | ||||
Sequence: R | ||||||
Binding site | 359 | GTP (UniProtKB | ChEBI) | ||||
Sequence: R | ||||||
Binding site | 385-387 | GTP (UniProtKB | ChEBI) | ||||
Sequence: KLD | ||||||
Binding site | 468-470 | GTP (UniProtKB | ChEBI) | ||||
Sequence: GVG |
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | chloroplast | |
Molecular Function | adenylosuccinate synthase activity | |
Molecular Function | GTP binding | |
Molecular Function | magnesium ion binding | |
Biological Process | 'de novo' AMP biosynthetic process | |
Biological Process | IMP metabolic process |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameAdenylosuccinate synthetase, chloroplastic
- EC number
- Short namesAMPSase ; AdSS
- Alternative names
Gene names
Organism names
- Organism
- Strain
- Taxonomic lineageEukaryota > Viridiplantae > Chlorophyta > Mamiellophyceae > Mamiellales > Bathycoccaceae > Ostreococcus
Accessions
- Primary accessionQ017T9
- Secondary accessions
Proteomes
Subcellular Location
PTM/Processing
Features
Showing features for transit peptide, chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Transit peptide | 1-54 | Chloroplast | ||||
Sequence: MATARVMVADRARAFGGTTATRARRDDQGRRVTIARGIPSRARVVVARASERAY | ||||||
Chain | PRO_0000399280 | 55-480 | Adenylosuccinate synthetase, chloroplastic | |||
Sequence: AELGNVCAVLGSQWGDEGKGKLVDILAREYDVVARCQGGANAGHTIYDDNGKKYALHLVPSGILNENATCVVGNGVVVHLPGMFEEIDKLLQAGVDARGRMIVSDRAHLLFDLHKEIDGLREEELSGNKIGTTKRGIGPAYASKATRNGVRLGDIRDEERFATMLRALAADAAARFEGFQYDVEAEIVRYKEIAERIEPFIADTVEYINEAHDSGKKILVEGANATMLDLDFGTYPFVTSSNPALGGVCNGLGLAPRKFKTIIGVAKAYTTRVGAGPYPTELFGDVADKLRELGYEYGTTTGRPRRIGWLDMVALNYANLINGFTHLNITKLDVLSEMDELKIGVAYKLPNGKTTKSFPADIATLEKVETVYETLPGWKEDISKVRTWDDLPENAKKYVLRVEELAGVECKFIGVGPGRDAMVIKP |
Interaction
Structure
Sequence
- Sequence statusComplete
- Sequence processingThe displayed sequence is further processed into a mature form.
- Length480
- Mass (Da)52,386
- Last updated2015-10-14 v2
- ChecksumE5FDCF8B93A6E1B6
Keywords
- Technical term