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A4QLT3 (PSAA_NASOF) Reviewed, UniProtKB/Swiss-Prot

Last modified April 3, 2013. Version 31. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (1) | Third-party data text xml rdf/xml gff fasta
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Names and origin

Protein namesRecommended name:
Photosystem I P700 chlorophyll a apoprotein A1
EC=1.97.1.12
Alternative name(s):
PSI-A
PsaA
Gene names
Name:psaA
Encoded onPlastid; Chloroplast
OrganismNasturtium officinale (Water-cress) (Rorippa nasturtium-aquaticum)
Taxonomic identifier65948 [NCBI]
Taxonomic lineageEukaryota › Viridiplantae › Streptophyta › Embryophyta › Tracheophyta › Spermatophyta › Magnoliophyta › eudicotyledons › core eudicotyledons › rosids › malvids › Brassicales › Brassicaceae › Cardamineae › Nasturtium

Protein attributes

Sequence length750 AA.
Sequence statusComplete.
Protein existenceInferred 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-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. 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.

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 750750Photosystem I P700 chlorophyll a apoprotein A1 HAMAP-Rule MF_00458
PRO_0000294226

Regions

Transmembrane70 – 9324Helical; Name=I; Potential
Transmembrane156 – 17924Helical; Name=II; Potential
Transmembrane195 – 21925Helical; Name=III; Potential
Transmembrane291 – 30919Helical; Name=IV; Potential
Transmembrane346 – 36924Helical; Name=V; Potential
Transmembrane385 – 41127Helical; Name=VI; Potential
Transmembrane433 – 45523Helical; Name=VII; Potential
Transmembrane531 – 54919Helical; Name=VIII; Potential
Transmembrane589 – 61022Helical; Name=IX; Potential
Transmembrane664 – 68623Helical; Name=X; Potential
Transmembrane724 – 74421Helical; Name=XI; Potential

Sites

Metal binding5731Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding5821Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding6751Magnesium (chlorophyll-a' A1 axial ligand; P700 special pair) By similarity
Metal binding6831Magnesium (chlorophyll-a A3 axial ligand) By similarity
Binding site6911Chlorophyll-a A3 By similarity
Binding site6921Phylloquinone A By similarity

Sequences

Sequence LengthMass (Da)Tools
A4QLT3 [UniParc].

Last modified May 15, 2007. Version 1.
Checksum: 8DCE4B0F0C1224D1

FASTA75083,229
        10         20         30         40         50         60 
MIIRSPEPEV KILVDRDPIK TSFEEWAKPG HFSRTIAKGP DTTTWIWNLH ADAHDFDSHT 

        70         80         90        100        110        120 
SDLEEISRKV FSAHFGQLSI IFLWLSGMYF HGARFSNYEA WLSDPTHIGP SAQVVWPIVG 

       130        140        150        160        170        180 
QEILNGDVGG GFRGIQITSG FFQIWRASGI TSELQLYCTA IGALVFAALM LFAGWFHYHK 

       190        200        210        220        230        240 
AAPKLAWFQD VESMLNHHLA GLLGLGSLSW AGHQVHVSLP INQFLNAGVD PKEIPLPHEF 

       250        260        270        280        290        300 
ILNRDLLAQL YPSFAEGATP FFTLNWSKYS EFLTFRGGLD PVTGGLWLTD IAHHHLAIAI 

       310        320        330        340        350        360 
LFLIAGHMYR TNWGIGHGIK DILEAHKGPF TGQGHKGLYE ILTTLWHAQL SLNLAMLGSL 

       370        380        390        400        410        420 
TIVVAHHMYS MPPYPYLATD YATQLSLFTH HMWIGGFLIV GAAAHAAIFM VRDYDPTNRY 

       430        440        450        460        470        480 
NDLLDRVLRH RDAIISHLNW VCIFLGFHSF GLYIHNDTMS ALGRPQDMFS DTAIQLQPVF 

       490        500        510        520        530        540 
AQWIQNTHAL APGVTAPGET ASTSLTWGGG ELVAVGGKVA LLPIPLGTAD FLVHHIHAFT 

       550        560        570        580        590        600 
IHVTVLILLK GVLFARSSRL IPDKANLGFR FPCDGPGRGG TCQVSAWDHV FLGLFWMYNA 

       610        620        630        640        650        660 
ISVVIFHFSW KMQSDVWGSI SDQGVVTHIT GGNFAQSSIT INGWLRDFLW AQASQVIQSY 

       670        680        690        700        710        720 
GSSLSAYGLF FLGAHFVWAF SLMFLFSGRG YWQELIESIV WAHNKLKVAP ATQPRALSIV 

       730        740        750 
QGRAVGVTHY LLGGIATTWA FFLARIIAVG

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References

[1]"Sequencing analysis of Nasturtium officinale chloroplast DNA."
Hosouchi T., Tsuruoka H., Kotani H.
Submitted (MAR-2007) to the EMBL/GenBank/DDBJ databases
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].

Cross-references

Sequence databases

EMBL
GenBank
DDBJ		AP009376 Genomic DNA. Translation: BAF50638.1.
RefSeqYP_001123814.1. NC_009275.1.

3D structure databases

ProteinModelPortalA4QLT3.
SMRA4QLT3. Positions 23-750.
ModBaseSearch...

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Genome annotation databases

GeneID4962095.

Phylogenomic databases

ProtClustDBCHL00056.

Family and domain databases

Gene3D1.20.1130.10. 1 hit.
HAMAPMF_00458. PSI_PsaA.
InterProIPR006243. PSI_PsaA.
IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
[Graphical view]
PfamPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFPIRSF002905. PSI_A. 1 hit.
PRINTSPR00257. PHOTSYSPSAAB.
TIGRFAMsTIGR01335. psaA. 1 hit.
PROSITEPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]
ProtoNetSearch...

Entry information

Entry namePSAA_NASOF
AccessionPrimary (citable) accession number: A4QLT3
Entry history
Integrated into UniProtKB/Swiss-Prot: July 10, 2007
Last sequence update: May 15, 2007
Last modified: April 3, 2013
This is version 31 of the entry and version 1 of the sequence. [Complete history]
Entry statusReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

Relevant documents

SIMILARITY comments

Index of protein domains and families

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