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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

Complete GO annotation...

Keywords - Molecular functioni

Oxidoreductase

Keywords - Biological processi

Electron transport, Photosynthesis, Transport

Keywords - Ligandi

4Fe-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

  • Plastidchloroplast thylakoid membrane UniRule annotation; Peripheral membrane protein UniRule annotation; Stromal side UniRule annotation

GO - Cellular componenti

Complete GO annotation...

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.

Structurei

Secondary structure

181
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Beta strandi4 – 8Combined sources5
Beta strandi15 – 17Combined sources3
Helixi18 – 20Combined sources3
Turni22 – 24Combined sources3
Beta strandi27 – 30Combined sources4
Beta strandi32 – 34Combined sources3
Beta strandi37 – 41Combined sources5
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[»]
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

Sequence similaritiesi

Contains 2 4Fe-4S ferredoxin-type domains.UniRule annotation

Keywords - Domaini

Repeat

Family and domain databases

HAMAPiMF_01303. PSI_PsaC. 1 hit.
InterProiIPR017896. 4Fe4S_Fe-S-bd.
IPR017900. 4Fe4S_Fe_S_CS.
IPR017491. PSI_PsaC.
[Graphical view]
TIGRFAMsiTIGR03048. PS_I_psaC. 1 hit.
PROSITEiPS00198. 4FE4S_FER_1. 2 hits.
PS51379. 4FE4S_FER_2. 2 hits.
[Graphical view]

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.

Cross-referencesi

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.

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[»]
ProteinModelPortaliP10793.
SMRiP10793.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

DIPiDIP-60283N.

Proteomic databases

PRIDEiP10793.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

GeneIDi9073063.

Miscellaneous databases

EvolutionaryTraceiP10793.

Family and domain databases

HAMAPiMF_01303. PSI_PsaC. 1 hit.
InterProiIPR017896. 4Fe4S_Fe-S-bd.
IPR017900. 4Fe4S_Fe_S_CS.
IPR017491. PSI_PsaC.
[Graphical view]
TIGRFAMsiTIGR03048. PS_I_psaC. 1 hit.
PROSITEiPS00198. 4FE4S_FER_1. 2 hits.
PS51379. 4FE4S_FER_2. 2 hits.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiPSAC_PEA
AccessioniPrimary (citable) accession number: P10793
Entry historyi
Integrated into UniProtKB/Swiss-Prot: July 1, 1989
Last sequence update: January 23, 2007
Last modified: November 2, 2016
This is version 116 of the entry and version 3 of the sequence. [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
  2. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.