Q9MTQ4 (PSAA_AMPOP) Reviewed, UniProtKB/Swiss-Prot
Last modified
April 3, 2013.
Version 64.
History...
Clusters with 
Names·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize orderNames·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize orderNames and origin
| Protein names | Recommended name: Photosystem I P700 chlorophyll a apoprotein A1 EC=1.97.1.12 Alternative name(s): PSI-A PsaA | ||
| Gene names |
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| Encoded on | Plastid; Chloroplast | ||
| Organism | Amphidinium operculatum (Dinoflagellate) | ||
| Taxonomic identifier | 107036 [NCBI] | ||
| Taxonomic lineage | Eukaryota › Alveolata › Dinophyceae › Gymnodiniales › Gymnodiniaceae › Amphidinium |
Protein attributes
| Sequence length | 671 AA. |
| Sequence status | Fragment. |
| Protein existence | Inferred from homology |
General annotation (Comments)
| Function | PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin or cytochrome c6. HAMAP-Rule MF_00458 |
| Catalytic activity | Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin. HAMAP-Rule MF_00458 |
| Cofactor | P700 is a chlorophyll a/chlorophyll a' dimer, A0 is one or more chlorophyll a, A1 is one or both phylloquinones and FX is a shared 4Fe-4S iron-sulfur center By similarity. |
| Subunit structure | The PsaA/B heterodimer binds the P700 chlorophyll special pair and subsequent electron acceptors. PSI consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The eukaryotic PSI reaction center is composed of at least 11 subunits By similarity. |
| Subcellular location | Plastid › chloroplast thylakoid membrane; Multi-pass membrane protein By similarity HAMAP-Rule MF_00458. |
| Sequence similarities | Belongs to the PsaA/PsaB family. |
Ontologies
Sequence annotation (Features)
| Feature key | Position(s) | Length | Description | Graphical view | Feature identifier | ||||
Molecule processing | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chain | ‹1 – 671 | ›671 | Photosystem I P700 chlorophyll a apoprotein A1 HAMAP-Rule MF_00458 | PRO_0000088530 | |||||
Regions | |||||||||
| Transmembrane | 68 – 91 | 24 | Helical; Name=I; Potential | ||||||
| Transmembrane | 145 – 168 | 24 | Helical; Name=II; Potential | ||||||
| Transmembrane | 185 – 209 | 25 | Helical; Name=III; Potential | ||||||
| Transmembrane | 259 – 277 | 19 | Helical; Name=IV; Potential | ||||||
| Transmembrane | 295 – 318 | 24 | Helical; Name=V; Potential | ||||||
| Transmembrane | 334 – 360 | 27 | Helical; Name=VI; Potential | ||||||
| Transmembrane | 377 – 399 | 23 | Helical; Name=VII; Potential | ||||||
| Transmembrane | 451 – 469 | 19 | Helical; Name=VIII; Potential | ||||||
| Transmembrane | 509 – 530 | 22 | Helical; Name=IX; Potential | ||||||
| Transmembrane | 584 – 606 | 23 | Helical; Name=X; Potential | ||||||
| Transmembrane | 644 – 664 | 21 | Helical; Name=XI; Potential | ||||||
Sites | |||||||||
| Metal binding | 493 | 1 | Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity | ||||||
| Metal binding | 502 | 1 | Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity | ||||||
| Metal binding | 595 | 1 | Magnesium (chlorophyll-a' A1 axial ligand; P700 special pair) By similarity | ||||||
| Metal binding | 603 | 1 | Magnesium (chlorophyll-a A3 axial ligand) By similarity | ||||||
| Binding site | 611 | 1 | Chlorophyll-a A3 By similarity | ||||||
| Binding site | 612 | 1 | Phylloquinone A By similarity | ||||||
Experimental info | |||||||||
| Non-terminal residue | 1 | 1 | |||||||
Sequences
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References
| [1] | "Minicircular plastid DNA in the dinoflagellate Amphidinium operculatum." Barbrook A.C., Howe C.J. Mol. Gen. Genet. 263:152-158(2000) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA]. Strain: CCAP 1102/6. |
Cross-references
Sequence databases | |
|---|---|
| EMBL GenBank DDBJ | AJ250264 Genomic DNA. Translation: CAB75844.1. |
3D structure databases | |
| ProteinModelPortal | Q9MTQ4. |
| ModBase | Search... |
Protocols and materials databases | |
| StructuralBiologyKnowledgebase | Search... |
Family and domain databases | |
| Gene3D | 1.20.1130.10. 1 hit. |
| HAMAP | MF_00458. PSI_PsaA. |
| InterPro | IPR001280. PSI_PsaA/B. IPR020586. PSI_PsaA/B_CS. [Graphical view] |
| Pfam | PF00223. PsaA_PsaB. 1 hit. [Graphical view] |
| PRINTS | PR00257. PHOTSYSPSAAB. |
| PROSITE | PS00419. PHOTOSYSTEM_I_PSAAB. 1 hit. [Graphical view] |
| ProtoNet | Search... |
Entry information
| Entry name | PSAA_AMPOP | ||||||||
| Accession | Primary (citable) accession number: Q9MTQ4 | ||||||||
| Entry history |
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| Entry status | Reviewed (UniProtKB/Swiss-Prot) | ||||||||
Relevant documents
| SIMILARITY comments Index of protein domains and families |