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A0T0M9 (PSAB_THAPS) Reviewed, UniProtKB/Swiss-Prot

Last modified April 16, 2014. Version 41. Feed History...

Clusters with 100%, 90%, 50% identity | Documents (1) | Third-party data text xml rdf/xml gff fasta
to top of pageNames·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize order

Names and origin

Protein namesRecommended name:
Photosystem I P700 chlorophyll a apoprotein A2

EC=1.97.1.12
Alternative name(s):
PSI-B
PsaB
Gene names
Name:psaB
Encoded onPlastid; Chloroplast
OrganismThalassiosira pseudonana (Marine diatom) (Cyclotella nana) [Reference proteome]
Taxonomic identifier35128 [NCBI]
Taxonomic lineageEukaryotaStramenopilesBacillariophytaCoscinodiscophyceaeThalassiosirophycidaeThalassiosiralesThalassiosiraceaeThalassiosira

Protein attributes

Sequence length733 AA.
Sequence statusComplete.
Protein existenceInferred from homology

General annotation (Comments)

Function

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 By similarity. HAMAP-Rule MF_00482

Catalytic activity

Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin. HAMAP-Rule MF_00482

Cofactor

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.

Subunit structure

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.

Subcellular location

Plastidchloroplast thylakoid membrane; Multi-pass membrane protein HAMAP-Rule MF_00482.

Sequence similarities

Belongs to the PsaA/PsaB family.

Sequence annotation (Features)

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifier

Molecule processing

Chain1 – 733733Photosystem I P700 chlorophyll a apoprotein A2 HAMAP-Rule MF_00482
PRO_0000277143

Regions

Transmembrane46 – 6924Helical; Name=I; Potential
Transmembrane134 – 15724Helical; Name=II; Potential
Transmembrane174 – 19825Helical; Name=III; Potential
Transmembrane272 – 29019Helical; Name=IV; Potential
Transmembrane329 – 35224Helical; Name=V; Potential
Transmembrane368 – 39427Helical; Name=VI; Potential
Transmembrane416 – 43823Helical; Name=VII; Potential
Transmembrane516 – 53419Helical; Name=VIII; Potential
Transmembrane574 – 59522Helical; Name=IX; Potential
Transmembrane642 – 66423Helical; Name=X; Potential
Transmembrane706 – 72621Helical; Name=XI; Potential

Sites

Metal binding5581Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding5671Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity
Metal binding6531Magnesium (chlorophyll-a B1 axial ligand; P700 special pair) By similarity
Metal binding6611Magnesium (chlorophyll-a B3 axial ligand) By similarity
Binding site6691Chlorophyll-a B3 By similarity
Binding site6701Phylloquinone B By similarity

Sequences

Sequence LengthMass (Da)Tools
A0T0M9 [UniParc].

Last modified January 9, 2007. Version 1.
Checksum: F5C6FCBE674FB914

FASTA73382,089
        10         20         30         40         50         60 
MATKFPKFSQ ALAQDPATRR IWYGIATAHD LEAHDGMTEE NLYQKIFASH FGHLAIIFLW 

        70         80         90        100        110        120 
TSGNLFHVAW QGNFEKWVSN PLKTRPIAHS IWDPHFGESA LKAFSKGNTY PVNITFSGLY 

       130        140        150        160        170        180 
QWWYTIGFRT NQELYKGSIG LLLLASVLLI AGWLHLQPKF RPSLSWFKNN ESRLNHHLSG 

       190        200        210        220        230        240 
LLGFSSLAWT GHLVHVAIPA SRGVHVGWDN FLTTPPHPAG LTPFFTGNWT VYAENPDSAT 

       250        260        270        280        290        300 
HVFNTSEGSG TAILTFLGGF HPQTQSLWLS DMAHHHLAIA VVFIVAGHMY RTNFGIGHNM 

       310        320        330        340        350        360 
KEILDAHRPP GGRLGAGHVG LFETITNSLH MQLGLALACL GVATSLTAQH MYALTPYAYL 

       370        380        390        400        410        420 
SKDFTTEAAL YTHHQYIAGF LMVGAFAHGA IFFVRDYDPE LNKNNVLARM LEHKEAIISH 

       430        440        450        460        470        480 
LSWASLFLGF HTLGLYIHND TVVAFGQPEK QILFEPLFAE YIQAASGKAV YQFNVLLASS 

       490        500        510        520        530        540 
TSPATAAGNQ VWLPGWLEAI NNPKTDLFLK IGPGDFLVHH AIALGLHVTA LILVKGALDA 

       550        560        570        580        590        600 
RGSKLMPDKK DFGYSFPCDG PGRGGTCDIS AWDAFYLAMF WMLNTIGWVT FYWHWKHMTI 

       610        620        630        640        650        660 
WGGNPGQFDE SSNYIMGWLR DYLWLNSSPL INGYNPFGMN NLSVWSWMFL FGHLIWATGF 

       670        680        690        700        710        720 
MFLISWRGYW QELIETLVWA HERTPLANLI RWRDKPVALS IVQARLVGLV HFSVGYILTY 

       730 
AAFVIASTSG KFA 

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References

[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.

Cross-references

Sequence databases

EMBL
GenBank
DDBJ
EF067921 Genomic DNA. Translation: ABK20714.1.
RefSeqYP_874491.1. NC_008589.1.

3D structure databases

ProteinModelPortalA0T0M9.
SMRA0T0M9. Positions 2-732.
ModBaseSearch...
MobiDBSearch...

Protocols and materials databases

StructuralBiologyKnowledgebaseSearch...

Genome annotation databases

EnsemblProtistsThapsdraft1611; Thapsdraft1611; Thapsdraft1611.
GeneID4524814.

Phylogenomic databases

eggNOGNOG04867.
HOGENOMHOG000276868.
ProtClustDBCHL00054.

Family and domain databases

Gene3D1.20.1130.10. 1 hit.
HAMAPMF_00482. PSI_PsaB.
InterProIPR001280. PSI_PsaA/B.
IPR020586. PSI_PsaA/B_CS.
IPR006244. PSI_PsaB.
[Graphical view]
PfamPF00223. PsaA_PsaB. 1 hit.
[Graphical view]
PIRSFPIRSF002905. PSI_A. 1 hit.
PRINTSPR00257. PHOTSYSPSAAB.
SUPFAMSSF81558. SSF81558. 1 hit.
TIGRFAMsTIGR01336. psaB. 1 hit.
PROSITEPS00419. PHOTOSYSTEM_I_PSAAB. 1 hit.
[Graphical view]
ProtoNetSearch...

Entry information

Entry namePSAB_THAPS
AccessionPrimary (citable) accession number: A0T0M9
Entry history
Integrated into UniProtKB/Swiss-Prot: February 6, 2007
Last sequence update: January 9, 2007
Last modified: April 16, 2014
This is version 41 of the entry and version 1 of the sequence. [Complete history]
Entry statusReviewed (UniProtKB/Swiss-Prot)

Relevant documents

SIMILARITY comments

Index of protein domains and families