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A0T0L9

- PSAA_PHATC

UniProt

A0T0L9 - PSAA_PHATC

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Protein
Photosystem I P700 chlorophyll a apoprotein A1
Gene
psaA
Organism
Phaeodactylum tricornutum (strain CCAP 1055/1)
Status
Reviewed - Annotation score: 4 out of 5 - Protein inferred from homologyi

Functioni

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.UniRule annotation

Catalytic activityi

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

Cofactori

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.

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi575 – 5751Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal bindingi584 – 5841Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal bindingi677 – 6771Magnesium (chlorophyll-a' A1 axial ligand; P700 special pair) By similarity
Metal bindingi685 – 6851Magnesium (chlorophyll-a A3 axial ligand) By similarity
Binding sitei693 – 6931Chlorophyll-a A3 By similarity
Binding sitei694 – 6941Phylloquinone A By similarity

GO - Molecular functioni

  1. 4 iron, 4 sulfur cluster binding Source: UniProtKB-KW
  2. chlorophyll binding Source: UniProtKB-KW
  3. electron carrier activity Source: UniProtKB-HAMAP
  4. magnesium ion binding Source: UniProtKB-HAMAP
  5. oxidoreductase activity Source: UniProtKB-KW

GO - Biological processi

  1. photosynthesis Source: UniProtKB-HAMAP
  2. protein-chromophore linkage Source: UniProtKB-KW
Complete GO annotation...

Keywords - Molecular functioni

Oxidoreductase

Keywords - Biological processi

Electron transport, Photosynthesis, Transport

Keywords - Ligandi

4Fe-4S, Chlorophyll, Chromophore, Iron, Iron-sulfur, Magnesium, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A1 (EC:1.97.1.12)
Alternative name(s):
PSI-A
PsaA
Gene namesi
Name:psaA
Encoded oniPlastid; Chloroplast
OrganismiPhaeodactylum tricornutum (strain CCAP 1055/1)
Taxonomic identifieri556484 [NCBI]
Taxonomic lineageiEukaryotaStramenopilesBacillariophytaBacillariophyceaeBacillariophycidaeNaviculalesPhaeodactylaceaePhaeodactylum
ProteomesiUP000000759: Chloroplast

Subcellular locationi

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei73 – 9624Helical; Name=I; Reviewed prediction
Add
BLAST
Transmembranei159 – 18224Helical; Name=II; Reviewed prediction
Add
BLAST
Transmembranei198 – 22225Helical; Name=III; Reviewed prediction
Add
BLAST
Transmembranei294 – 31219Helical; Name=IV; Reviewed prediction
Add
BLAST
Transmembranei349 – 37224Helical; Name=V; Reviewed prediction
Add
BLAST
Transmembranei388 – 41427Helical; Name=VI; Reviewed prediction
Add
BLAST
Transmembranei436 – 45823Helical; Name=VII; Reviewed prediction
Add
BLAST
Transmembranei533 – 55119Helical; Name=VIII; Reviewed prediction
Add
BLAST
Transmembranei591 – 61222Helical; Name=IX; Reviewed prediction
Add
BLAST
Transmembranei666 – 68823Helical; Name=X; Reviewed prediction
Add
BLAST
Transmembranei726 – 74621Helical; Name=XI; Reviewed prediction
Add
BLAST

GO - Cellular componenti

  1. chloroplast thylakoid membrane Source: UniProtKB-SubCell
  2. integral component of membrane Source: UniProtKB-KW
  3. photosystem I Source: UniProtKB-KW
Complete GO annotation...

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem I, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 752752Photosystem I P700 chlorophyll a apoprotein A1UniRule annotation
PRO_0000275971Add
BLAST

Interactioni

Subunit structurei

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.

Structurei

3D structure databases

ProteinModelPortaliA0T0L9.
SMRiA0T0L9. Positions 14-751.

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.

Keywords - Domaini

Transmembrane, Transmembrane helix

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00458. PSI_PsaA.
InterProiIPR006243. PSI_PsaA.
IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
[Graphical view]
PfamiPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFiPIRSF002905. PSI_A. 1 hit.
PRINTSiPR00257. PHOTSYSPSAAB.
SUPFAMiSSF81558. SSF81558. 1 hit.
TIGRFAMsiTIGR01335. psaA. 1 hit.
PROSITEiPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

A0T0L9-1 [UniParc]FASTAAdd to Basket

« Hide

MAISSTDRRS KNVQIFVEKD AVETSFAKWA QPGHFSRTLA KGPKTTTWIW    50
NLHADAHDFD SQTSSLEEVS RKIFSAHFGQ LSVIFLWISG MHFHGAYFSN 100
YSAWLTDPVN IKQSSQVVWP IVGQEILNGD VGGNFQGIQT TSGWFQMWRA 150
EGITSEVELY WIAIGGLAMS AIMLFAGWFH YHKAAPKLEW FQNAESMMNH 200
HLAGLLGLGC LSWSGHQIHV ALPINKLLDA GVAPQEIPLP HEFLINRELM 250
SQLYPSFSKG LAPFFSGHWG EYSDFLTFKG GLNPVTGGLW LSDIAHHHLA 300
LAVLFIFAGH MYRTNWGIGH SMKEILEAHK GPFTGEGHKG LYEILTTSWH 350
AQLAINLAMM GSLSIIVAHH MYAMPPYPYI ATDYATQLSL FTHHMWIGGF 400
CVTGGAAHAA IFMVRDYTPA NNYNNLLDRV LRHRDSIIAH LNWVCIFLGC 450
HAFGFYIHND TMRALGRPQD MFSDKAIQLQ PIFAQWIQNI HLLAPGTTAP 500
NALATTSYAF GGEVVEVGGK IAMMPIQLGT ADFMVHHIHA FTIHVTVLIL 550
LKGVLYARSS KLIPDKANLG FRFPCDGPGR GGTCQSSSWD HVFLGLFWMY 600
NSISVVIFHF SWKMQSDVWG TISPDGSISH ITGGNFAKGA ITINGWLRDF 650
LWSQASQVIQ SYGSAASAYG LIFLGAHFIW AFSLMFLFSG RGYWQELIES 700
IVWAHNKLNF APAIQPRALS ITQGRAVGLA HYLLGGIGTT WAFFLARAVS 750
IS 752
Length:752
Mass (Da):83,596
Last modified:January 9, 2007 - v1
Checksum:iA2FEB64333F4C252
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
EF067920 Genomic DNA. Translation: ABK20582.1.
RefSeqiYP_874359.1. NC_008588.1.

Genome annotation databases

GeneIDi4524636.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
EF067920 Genomic DNA. Translation: ABK20582.1 .
RefSeqi YP_874359.1. NC_008588.1.

3D structure databases

ProteinModelPortali A0T0L9.
SMRi A0T0L9. Positions 14-751.
ModBasei Search...
MobiDBi Search...

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

GeneIDi 4524636.

Family and domain databases

Gene3Di 1.20.1130.10. 1 hit.
HAMAPi MF_00458. PSI_PsaA.
InterProi IPR006243. PSI_PsaA.
IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
[Graphical view ]
Pfami PF00223. PsaA_PsaB. 1 hit.
[Graphical view ]
PIRSFi PIRSF002905. PSI_A. 1 hit.
PRINTSi PR00257. PHOTSYSPSAAB.
SUPFAMi SSF81558. SSF81558. 1 hit.
TIGRFAMsi TIGR01335. psaA. 1 hit.
PROSITEi PS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view ]
ProtoNeti Search...

Publicationsi

  1. "Chloroplast genomes of the diatoms Phaeodactylum tricornutum and Thalassiosira pseudonana: comparison with other plastid genomes of the red lineage."
    Oudot-Le Secq M.-P., Grimwood J., Shapiro H., Armbrust E.V., Bowler C., Green B.R.
    Mol. Genet. Genomics 277:427-439(2007) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
    Strain: CCAP 1055/1.

Entry informationi

Entry nameiPSAA_PHATC
AccessioniPrimary (citable) accession number: A0T0L9
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 6, 2007
Last sequence update: January 9, 2007
Last modified: May 14, 2014
This is version 43 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3

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