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A0T0M8

- PSAA_THAPS

UniProt

A0T0M8 - PSAA_THAPS

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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: 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

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)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi575 – 5751Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi584 – 5841Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi677 – 6771Magnesium (chlorophyll-a' A1 axial ligand; P700 special pair)UniRule annotation
Metal bindingi685 – 6851Magnesium (chlorophyll-a A3 axial ligand)UniRule annotation
Binding sitei693 – 6931Chlorophyll-a A3UniRule annotation
Binding sitei694 – 6941Phylloquinone AUniRule annotation

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 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
ProteomesiUP000001449: Chloroplast

Subcellular locationi

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

GO - Cellular componenti

  1. chloroplast thylakoid membrane Source: UniProtKB-HAMAP
  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 A1PRO_0000275972Add
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.UniRule annotation

Structurei

3D structure databases

ProteinModelPortaliA0T0M8.
SMRiA0T0M8. Positions 14-751.
ModBaseiSearch...
MobiDBiSearch...

Transmembrane

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei73 – 9624Helical; Name=IUniRule annotationAdd
BLAST
Transmembranei159 – 18224Helical; Name=IIUniRule annotationAdd
BLAST
Transmembranei198 – 22225Helical; Name=IIIUniRule annotationAdd
BLAST
Transmembranei294 – 31219Helical; Name=IVUniRule annotationAdd
BLAST
Transmembranei349 – 37224Helical; Name=VUniRule annotationAdd
BLAST
Transmembranei388 – 41427Helical; Name=VIUniRule annotationAdd
BLAST
Transmembranei436 – 45823Helical; Name=VIIUniRule annotationAdd
BLAST
Transmembranei533 – 55119Helical; Name=VIIIUniRule annotationAdd
BLAST
Transmembranei591 – 61222Helical; Name=IXUniRule annotationAdd
BLAST
Transmembranei666 – 68823Helical; Name=XUniRule annotationAdd
BLAST
Transmembranei726 – 74621Helical; Name=XIUniRule annotationAdd
BLAST

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.
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:
EMBL
GenBank
DDBJ
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:
EMBL
GenBank
DDBJ
Links Updated
EF067921 Genomic DNA. Translation: ABK20713.1 .
RefSeqi YP_874490.1. NC_008589.1.

3D structure databases

ProteinModelPortali A0T0M8.
SMRi A0T0M8. Positions 14-751.
ModBasei Search...
MobiDBi Search...

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

GeneIDi 4524813.

Phylogenomic databases

InParanoidi A0T0M8.

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: CCMP1335.

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: October 29, 2014
This is version 41 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