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Protein

Photosystem I iron-sulfur center

Gene

psaC

Organism
Pisum sativum (Garden pea)
Status
Reviewed-Annotation score: Annotation score: 4 out of 5-Experimental evidence at protein leveli

Functioni

Apoprotein for the two 4Fe-4S centers FA and FB of photosystem I (PSI); essential for photochemical activity. FB is the terminal electron acceptor of PSI, donating electrons to ferredoxin. The C-terminus interacts with PsaA/B/D and helps assemble the protein into the PSI complex. Required for binding of PsaD and PsaE to PSI. 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.UniRule annotation

Catalytic activityi

Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin.UniRule annotation

Cofactori

[4Fe-4S] clusterUniRule annotationNote: Binds 2 [4Fe-4S] clusters. Cluster 2 is most probably the spectroscopically characterized electron acceptor FA and cluster 1 is most probably FB.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi11Iron-sulfur 1 (4Fe-4S)UniRule annotation1
Metal bindingi14Iron-sulfur 1 (4Fe-4S)UniRule annotation1
Metal bindingi17Iron-sulfur 1 (4Fe-4S)UniRule annotation1
Metal bindingi21Iron-sulfur 2 (4Fe-4S)UniRule annotation1
Metal bindingi48Iron-sulfur 2 (4Fe-4S)UniRule annotation1
Metal bindingi51Iron-sulfur 2 (4Fe-4S)UniRule annotation1
Metal bindingi54Iron-sulfur 2 (4Fe-4S)UniRule annotation1
Metal bindingi58Iron-sulfur 1 (4Fe-4S)UniRule annotation1

GO - Molecular functioni

GO - Biological processi

Keywordsi

Molecular functionOxidoreductase
Biological processElectron transport, Photosynthesis, Transport
Ligand4Fe-4S, Iron, Iron-sulfur, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I iron-sulfur centerUniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
9 kDa polypeptideUniRule annotation
PSI-CUniRule annotation
Photosystem I subunit VIIUniRule annotation
PsaCUniRule annotation
Gene namesi
Name:psaCUniRule annotation
Synonyms:frxA
Encoded oniPlastid; Chloroplast
OrganismiPisum sativum (Garden pea)
Taxonomic identifieri3888 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliophytaeudicotyledonsGunneridaePentapetalaerosidsfabidsFabalesFabaceaePapilionoideaeFabeaePisum

Subcellular locationi

Extracellular region or secreted Cytosol Plasma membrane Cell wall Cytoskeleton Vacuole Chloroplast Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertion Graphics by Christian Stolte; Source: COMPARTMENTS

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem I, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Initiator methionineiRemoved1 Publication
ChainiPRO_00000619962 – 81Photosystem I iron-sulfur centerAdd BLAST80

Proteomic databases

PRIDEiP10793.

Interactioni

Subunit structurei

The eukaryotic PSI reaction center is composed of at least 11 subunits.UniRule annotation

Protein-protein interaction databases

DIPiDIP-60283N.
IntActiP10793. 1 interactor.

Structurei

Secondary structure

181
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Beta strandi4 – 8Combined sources5
Helixi16 – 20Combined sources5
Turni22 – 24Combined sources3
Beta strandi27 – 30Combined sources4
Beta strandi32 – 34Combined sources3
Turni35 – 37Combined sources3
Beta strandi38 – 41Combined sources4
Helixi45 – 47Combined sources3
Helixi53 – 57Combined sources5
Beta strandi60 – 62Combined sources3
Beta strandi64 – 68Combined sources5
Turni74 – 78Combined sources5

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1YO9model-C2-81[»]
2O01X-ray3.40C2-81[»]
2WSCX-ray3.30C1-81[»]
2WSEX-ray3.49C1-81[»]
2WSFX-ray3.48C1-81[»]
3LW5X-ray3.30C1-81[»]
4RKUX-ray3.00C2-81[»]
4XK8X-ray2.80C/c2-81[»]
4Y28X-ray2.80C1-81[»]
5L8RX-ray2.60C1-81[»]
ProteinModelPortaliP10793.
SMRiP10793.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP10793.

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini2 – 314Fe-4S ferredoxin-type 1UniRule annotationAdd BLAST30
Domaini39 – 684Fe-4S ferredoxin-type 2UniRule annotationAdd BLAST30

Keywords - Domaini

Repeat

Family and domain databases

HAMAPiMF_01303. PSI_PsaC. 1 hit.
InterProiView protein in InterPro
IPR017896. 4Fe4S_Fe-S-bd.
IPR017900. 4Fe4S_Fe_S_CS.
IPR017491. PSI_PsaC.
TIGRFAMsiTIGR03048. PS_I_psaC. 1 hit.
PROSITEiView protein in PROSITE
PS00198. 4FE4S_FER_1. 2 hits.
PS51379. 4FE4S_FER_2. 2 hits.

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

P10793-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MSHSVKIYDT CIGCTQCVRA CPTDVLEMIP WGGCKAKQIA SAPRTEDCVG
60 70 80
CKRCESACPT DFLSVRVYLW HETTRSMGLA Y
Length:81
Mass (Da):8,980
Last modified:January 23, 2007 - v3
Checksum:i680556D8CB5603BF
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X13157 Genomic DNA. Translation: CAA31554.1.
PIRiS04033. FEPM1S.
RefSeqiYP_003587533.1. NC_014057.1.

Genome annotation databases

GeneIDi9073063.

Similar proteinsi

Entry informationi

Entry nameiPSAC_PEA
AccessioniPrimary (citable) accession number: P10793
Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 1, 1989
Last sequence update: January 23, 2007
Last modified: December 20, 2017
This is version 121 of the entry and version 3 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

3D-structure, Direct protein sequencing

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references