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Protein

Photosystem I P700 chlorophyll a apoprotein A1

Gene

psaA

Organism
Thalassiosira pseudonana (Marine diatom) (Cyclotella nana)
Status
Reviewed-Annotation score: 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.

Catalytic activityi

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

Cofactori

Note: 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.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Metal bindingi575Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi584Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi677Magnesium (chlorophyll-a' A1 axial ligand; P700 special pair)UniRule annotation1
Metal bindingi685Magnesium (chlorophyll-a A3 axial ligand)UniRule annotation1
Binding sitei693Chlorophyll-a A3UniRule annotation1
Binding sitei694Phylloquinone AUniRule 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, Chlorophyll, Chromophore, Iron, Iron-sulfur, Magnesium, Metal-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A1UniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
PSI-AUniRule annotation
PsaAUniRule annotation
Gene namesi
Name:psaAUniRule annotation
Encoded oniPlastid; Chloroplast
OrganismiThalassiosira pseudonana (Marine diatom) (Cyclotella nana)
Taxonomic identifieri35128 [NCBI]
Taxonomic lineageiEukaryotaStramenopilesBacillariophytaCoscinodiscophyceaeThalassiosirophycidaeThalassiosiralesThalassiosiraceaeThalassiosira
Proteomesi
  • UP000001449 Componenti: Chloroplast

Subcellular locationi

  • Plastidchloroplast thylakoid membrane UniRule annotation; Multi-pass membrane protein UniRule annotation

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei73 – 96Helical; Name=IUniRule annotationAdd BLAST24
Transmembranei159 – 182Helical; Name=IIUniRule annotationAdd BLAST24
Transmembranei198 – 222Helical; Name=IIIUniRule annotationAdd BLAST25
Transmembranei294 – 312Helical; Name=IVUniRule annotationAdd BLAST19
Transmembranei349 – 372Helical; Name=VUniRule annotationAdd BLAST24
Transmembranei388 – 414Helical; Name=VIUniRule annotationAdd BLAST27
Transmembranei436 – 458Helical; Name=VIIUniRule annotationAdd BLAST23
Transmembranei533 – 551Helical; Name=VIIIUniRule annotationAdd BLAST19
Transmembranei591 – 612Helical; Name=IXUniRule annotationAdd BLAST22
Transmembranei666 – 688Helical; Name=XUniRule annotationAdd BLAST23
Transmembranei726 – 746Helical; Name=XIUniRule annotationAdd BLAST21

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem I, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00002759721 – 752Photosystem I P700 chlorophyll a apoprotein A1Add BLAST752

Proteomic databases

PRIDEiA0T0M8.

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.UniRule annotation

Structurei

3D structure databases

ProteinModelPortaliA0T0M8.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

InParanoidiA0T0M8.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00458. PSI_PsaA. 1 hit.
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.

A0T0M8-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MAISSTERRS KNVQVFVEKD AVETSFAKWA QPGHFSRTLA KGPKTTTWIW
60 70 80 90 100
NLHADAHDFD SQTSSLEEVS RKIFSAHFGQ LAIIFLWISG MHFHGAYFSN
110 120 130 140 150
YSAWLTDPIS IKQSSQVVWP IVGQEILNAD VGGNFQGIQT TSGWFQMWRA
160 170 180 190 200
EGITSEVELY WTAIGGLAMS AIMLFAGWFH YHKAAPKLEW FQNAESMMNH
210 220 230 240 250
HLAGLLGLGC LSWSGHQIHI ALPINKLLDA GVSPQEIPLP HEFLINRDLM
260 270 280 290 300
AQLYPSFSKG LAPFFGGNWG EYSDFLTFKG GLNPVTGGLW LSDIAHHHLA
310 320 330 340 350
LSVLFIIAGH MYRTNWGIGH NMKEILEAHK GPFTGEGHKG LYEILTTSWH
360 370 380 390 400
AQLAINLAMM GSLSIIVAHH MYAMPPYPYL ATDYATQLSL FTHHMWIGGF
410 420 430 440 450
CVVGGAAHGA IFMVRDYTPA NNYNNLLDRV LRHRDAIISH LNWVCIFLGC
460 470 480 490 500
HAFGFYIHND TMRALGRPQD MFSDKAIQLQ PIFAQWIQNI HLLAPGTTAP
510 520 530 540 550
NALATTSYAF GGDVIEVGGK IAMMPIKLGT ADFMVHHIHA FTIHVTVLIL
560 570 580 590 600
LKGVLYARSS KLIPDKANLG FRFPCDGPGR GGTCQSSSWD HVFLGLFWMY
610 620 630 640 650
NSISVVIFHF SWKMQSDVWG TITPDGAISH ITGGNFAQSS ITINGWLRDF
660 670 680 690 700
LWSQASQVIQ SYGSASSAYG LIFLGAHFIW AFSLMFLFSG RGYWQELIES
710 720 730 740 750
IVWAHNKLNF APTIQPRALS ITQGRAVGLA HYLLGGIGTT WAFFLARAIS

IT
Length:752
Mass (Da):83,641
Last modified:January 9, 2007 - v1
Checksum:iE6DDF50B4BF1415E
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
EF067921 Genomic DNA. Translation: ABK20713.1.
RefSeqiYP_874490.1. NC_008589.1.

Genome annotation databases

GeneIDi4524813.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
EF067921 Genomic DNA. Translation: ABK20713.1.
RefSeqiYP_874490.1. NC_008589.1.

3D structure databases

ProteinModelPortaliA0T0M8.
ModBaseiSearch...
MobiDBiSearch...

Proteomic databases

PRIDEiA0T0M8.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

GeneIDi4524813.

Phylogenomic databases

InParanoidiA0T0M8.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00458. PSI_PsaA. 1 hit.
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]
ProtoNetiSearch...

Entry informationi

Entry nameiPSAA_THAPS
AccessioniPrimary (citable) accession number: A0T0M8
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 6, 2007
Last sequence update: January 9, 2007
Last modified: November 2, 2016
This is version 47 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

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.