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A0T0M9

- PSAB_THAPS

UniProt

A0T0M9 - PSAB_THAPS

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Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene

psaB

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.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.UniRule annotation

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Metal bindingi558 – 5581Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi567 – 5671Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation
Metal bindingi653 – 6531Magnesium (chlorophyll-a B1 axial ligand; P700 special pair)UniRule annotation
Metal bindingi661 – 6611Magnesium (chlorophyll-a B3 axial ligand)UniRule annotation
Binding sitei669 – 6691Chlorophyll-a B3UniRule annotation
Binding sitei670 – 6701Phylloquinone BUniRule 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 A2UniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
PSI-BUniRule annotation
PsaBUniRule annotation
Gene namesi
Name:psaBUniRule annotation
Encoded oniPlastid; Chloroplast
OrganismiThalassiosira pseudonana (Marine diatom) (Cyclotella nana)
Taxonomic identifieri35128 [NCBI]
Taxonomic lineageiEukaryotaStramenopilesBacillariophytaCoscinodiscophyceaeThalassiosirophycidaeThalassiosiralesThalassiosiraceaeThalassiosira
ProteomesiUP000001449: Chloroplast

Subcellular locationi

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 – 733733Photosystem I P700 chlorophyll a apoprotein A2PRO_0000277143Add
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

ProteinModelPortaliA0T0M9.
SMRiA0T0M9. Positions 2-732.
ModBaseiSearch...
MobiDBiSearch...

Transmembrane

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Transmembranei46 – 6924Helical; Name=IUniRule annotationAdd
BLAST
Transmembranei134 – 15724Helical; Name=IIUniRule annotationAdd
BLAST
Transmembranei174 – 19825Helical; Name=IIIUniRule annotationAdd
BLAST
Transmembranei272 – 29019Helical; Name=IVUniRule annotationAdd
BLAST
Transmembranei329 – 35224Helical; Name=VUniRule annotationAdd
BLAST
Transmembranei368 – 39427Helical; Name=VIUniRule annotationAdd
BLAST
Transmembranei416 – 43823Helical; Name=VIIUniRule annotationAdd
BLAST
Transmembranei516 – 53419Helical; Name=VIIIUniRule annotationAdd
BLAST
Transmembranei574 – 59522Helical; Name=IXUniRule annotationAdd
BLAST
Transmembranei642 – 66423Helical; Name=XUniRule annotationAdd
BLAST
Transmembranei706 – 72621Helical; Name=XIUniRule annotationAdd
BLAST

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiNOG04867.
HOGENOMiHOG000276868.
InParanoidiA0T0M9.

Family and domain databases

Gene3Di1.20.1130.10. 1 hit.
HAMAPiMF_00482. PSI_PsaB.
InterProiIPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[Graphical view]
PfamiPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFiPIRSF002905. PSI_A. 1 hit.
PRINTSiPR00257. PHOTSYSPSAAB.
SUPFAMiSSF81558. SSF81558. 1 hit.
TIGRFAMsiTIGR01336. psaB. 1 hit.
PROSITEiPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

A0T0M9-1 [UniParc]FASTAAdd to Basket

« Hide

        10         20         30         40         50
MATKFPKFSQ ALAQDPATRR IWYGIATAHD LEAHDGMTEE NLYQKIFASH
60 70 80 90 100
FGHLAIIFLW TSGNLFHVAW QGNFEKWVSN PLKTRPIAHS IWDPHFGESA
110 120 130 140 150
LKAFSKGNTY PVNITFSGLY QWWYTIGFRT NQELYKGSIG LLLLASVLLI
160 170 180 190 200
AGWLHLQPKF RPSLSWFKNN ESRLNHHLSG LLGFSSLAWT GHLVHVAIPA
210 220 230 240 250
SRGVHVGWDN FLTTPPHPAG LTPFFTGNWT VYAENPDSAT HVFNTSEGSG
260 270 280 290 300
TAILTFLGGF HPQTQSLWLS DMAHHHLAIA VVFIVAGHMY RTNFGIGHNM
310 320 330 340 350
KEILDAHRPP GGRLGAGHVG LFETITNSLH MQLGLALACL GVATSLTAQH
360 370 380 390 400
MYALTPYAYL SKDFTTEAAL YTHHQYIAGF LMVGAFAHGA IFFVRDYDPE
410 420 430 440 450
LNKNNVLARM LEHKEAIISH LSWASLFLGF HTLGLYIHND TVVAFGQPEK
460 470 480 490 500
QILFEPLFAE YIQAASGKAV YQFNVLLASS TSPATAAGNQ VWLPGWLEAI
510 520 530 540 550
NNPKTDLFLK IGPGDFLVHH AIALGLHVTA LILVKGALDA RGSKLMPDKK
560 570 580 590 600
DFGYSFPCDG PGRGGTCDIS AWDAFYLAMF WMLNTIGWVT FYWHWKHMTI
610 620 630 640 650
WGGNPGQFDE SSNYIMGWLR DYLWLNSSPL INGYNPFGMN NLSVWSWMFL
660 670 680 690 700
FGHLIWATGF MFLISWRGYW QELIETLVWA HERTPLANLI RWRDKPVALS
710 720 730
IVQARLVGLV HFSVGYILTY AAFVIASTSG KFA
Length:733
Mass (Da):82,089
Last modified:January 9, 2007 - v1
Checksum:iF5C6FCBE674FB914
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
EF067921 Genomic DNA. Translation: ABK20714.1.
RefSeqiYP_874491.1. NC_008589.1.

Genome annotation databases

GeneIDi4524814.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
EF067921 Genomic DNA. Translation: ABK20714.1 .
RefSeqi YP_874491.1. NC_008589.1.

3D structure databases

ProteinModelPortali A0T0M9.
SMRi A0T0M9. Positions 2-732.
ModBasei Search...
MobiDBi Search...

Protocols and materials databases

Structural Biology Knowledgebase Search...

Genome annotation databases

GeneIDi 4524814.

Phylogenomic databases

eggNOGi NOG04867.
HOGENOMi HOG000276868.
InParanoidi A0T0M9.

Family and domain databases

Gene3Di 1.20.1130.10. 1 hit.
HAMAPi MF_00482. PSI_PsaB.
InterProi IPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[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 TIGR01336. psaB. 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 nameiPSAB_THAPS
AccessioniPrimary (citable) accession number: A0T0M9
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 6, 2007
Last sequence update: January 9, 2007
Last modified: October 29, 2014
This is version 45 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